Board Exams MCQs on Local and General Anesthetic Agents Oral and Maxillofacial Surgery

A patient is scheduled for a prolonged oral and maxillofacial surgical procedure expected to last several hours. The surgeon prefers a local anesthetic agent with a long duration of action to provide sustained intraoperative anesthesia and prolonged postoperative analgesia. Which local anesthetic agent is preferred for prolonged surgical procedures?

During a pharmacology discussion in oral surgery training, a resident is asked about the proposed mechanisms by which local anesthetic agents block nerve conduction. Several theories have been suggested to explain their mode of action. Which of the following is NOT a theory of local anesthetic action?

During administration of an extraoral mandibular nerve block for a patient with severe trismus, the clinician advances the needle until it contacts the lateral pterygoid plate. To reach the mandibular nerve successfully, the direction of the needle is then modified. After contacting the pterygoid plate in the extraoral mandibular nerve block technique, the needle is directed:

A patient with hemophilia requires extraction of a mandibular tooth. To minimize the risk of deep tissue hematoma and uncontrolled bleeding, the oral surgeon selects the safest local anesthetic technique. Which local anesthetic technique is preferred in hemophilic patients?

During a pharmacology lecture on local anesthetics, students are asked to identify the agent that uniquely possesses intrinsic vasoconstrictive properties without the need for an added vasoconstrictor. Which of the following local anesthetics has intrinsic vasoconstrictive action?

A patient presents with an acutely infected mandibular molar associated with severe swelling and inflammation. During administration of local infiltration anesthesia, the dentist notices inadequate anesthetic effect despite proper technique. Why is local infiltration anesthesia difficult to achieve in the presence of inflammation?

A patient undergoing minor oral surgery is administered 20–40% nitrous oxide with oxygen for conscious sedation. During the procedure, the patient reports a pleasant light feeling and sensation of drifting while remaining conscious and cooperative. Which symptom is commonly experienced at this concentration of nitrous oxide?

During administration of local anesthesia for a prolonged oral surgical procedure, the dentist adds an alpha-adrenergic agonist (vasoconstrictor) to the anesthetic solution to improve anesthetic effectiveness and duration. Why are alpha-adrenergic agonists used in combination with local anesthetics?

During administration of a large dose of local anesthetic, a patient initially becomes restless and talkative, followed later by drowsiness and respiratory depression. The dentist recognizes these as manifestations of local anesthetic toxicity affecting the central nervous system. What is the typical CNS action of toxic doses of local anesthetics?

During extraction of a maxillary premolar, the dentist chooses a field block anesthesia technique to anesthetize the area by targeting nerves before they enter the operative site. In a field block, the local anesthetic solution is deposited near:

During a discussion on pain perception and anesthesia in oral surgery, a postgraduate student is asked about the most widely accepted theory explaining how pain impulses are modulated and transmitted within the nervous system. Which is the most accepted theory for conduction and modulation of pain?

A dentist plans extraction of mandibular anterior teeth and considers various anesthetic techniques to achieve pulpal anesthesia in the lower anterior region. Which of the following techniques is NOT indicated for anesthetizing mandibular anterior teeth?

During administration of lignocaine for dental extraction, the clinician explains that several local tissue factors influence the effectiveness and duration of anesthesia. Which of the following does NOT affect the action of lignocaine?

A patient becomes pale and loses consciousness briefly during administration of local anesthesia for tooth extraction. The dentist diagnoses syncope and reviews its characteristic features with the clinical team. Which of the following statements about syncope is FALSE?

During a difficult oral surgical procedure, the clinician adds hyaluronidase to the local anesthetic solution to improve tissue penetration and spread of the anesthetic agent. What is the effect of adding hyaluronidase to a local anesthetic solution?

During a prolonged dental extraction procedure, the dentist adds a vasoconstrictor to the local anesthetic solution to improve the depth and duration of anesthesia while reducing systemic absorption. Which additive most effectively increases the action of local anesthesia?

A patient with chronic liver disease requires administration of a local anesthetic for oral surgery. The dentist carefully selects the anesthetic agent, knowing that certain local anesthetics are metabolized mainly by the liver. Amide-type local anesthetic agents undergo biotransformation primarily in the:

A dentist plans to administer lignocaine without a vasoconstrictor for a minor oral surgical procedure. Before injection, the maximum safe dosage is calculated according to the patient’s body weight to avoid local anesthetic toxicity. What is the maximum recommended dose of lignocaine without adrenaline?

During induction of general anesthesia for a major oral and maxillofacial surgical procedure, the anesthetist carefully monitors the depth of anesthesia to ensure optimal conditions for surgery while maintaining patient safety. Surgery is ideally carried out during which plane of general anesthesia?

A dentist is preparing to administer 2% lignocaine with 1:200,000 adrenaline for a routine extraction and calculates the amount of vasoconstrictor present per milliliter of solution. How much adrenaline is present in 1 mL of a 1:200,000 solution?

A patient requires a pulpotomy procedure on a mandibular third molar. The dentist plans anesthesia and considers whether an inferior alveolar nerve block (IANB) alone will provide sufficient anesthesia for the procedure. Inferior alveolar nerve block alone can adequately be used for:

During administration of an inferior alveolar nerve block, the needle passes through soft tissue structures in the pterygomandibular region before reaching the target area near the mandibular foramen. Which muscle is pierced by the needle during an inferior alveolar nerve block?

A patient requires bilateral mandibular dental treatment under local anesthesia. The dentist considers administering bilateral inferior alveolar nerve blocks and reviews the associated precautions and misconceptions. Which of the following statements regarding a bilateral mandibular block is TRUE?

A patient is scheduled for major oral and maxillofacial surgery under general anesthesia. To maintain a secure airway, prevent aspiration of blood and debris, and allow unobstructed access to the oral cavity, the anesthetist selects the most appropriate anesthetic technique. Which general anesthetic technique is preferred for oral surgery?

During a postgraduate anesthesia discussion, residents compare various local anesthetic agents based on potency, duration of action, and toxicity. One agent is identified as having the longest duration and highest toxicity among commonly discussed local anesthetics. Which local anesthetic is considered the longest acting, most potent, and most toxic?

During recovery from general anesthesia after oral surgery, a patient suddenly develops inspiratory stridor and airway obstruction due to laryngospasm. The anesthetist immediately administers a drug to relax the laryngeal muscles and secure the airway. Which drug is commonly used to manage/prevent laryngospasm associated with general anesthesia?

A patient scheduled for tooth extraction reports a previous severe allergic reaction immediately after receiving a local anesthetic injection. The dentist evaluates possible contraindications before administering anesthesia. Which of the following is a contraindication to the use of a local anesthetic agent?

A patient with a known hereditary bleeding disorder requires dental treatment. The dentist considers avoiding deep nerve block injections because of the risk of hematoma formation and potentially life-threatening bleeding into fascial spaces. Inferior alveolar nerve block is absolutely contraindicated in patients suffering from:

During a neurophysiology discussion in oral surgery training, a student is asked about the characteristics of myelinated nerve fibers and their role in rapid nerve impulse conduction. Which of the following statements about myelinated nerve fibers is FALSE?

During administration of lidocaine for a lengthy dental procedure, excessive systemic absorption occurs due to accidental intravascular injection. The patient develops signs of local anesthetic toxicity. Which of the following is NOT a side effect of systemic absorption of lidocaine?

During a discussion on commonly used dental local anesthetics, a student asks why lidocaine replaced procaine as the most widely used local anesthetic in dentistry. Why is lidocaine more commonly used in dentistry?

A patient presents with a severely infected mandibular molar associated with swelling and pus formation. Despite proper injection technique, the dentist is unable to achieve profound local anesthesia in the affected area. In which of the following conditions is local anesthesia most likely to be ineffective?

A patient with uncontrolled thyroid disease requires dental extraction under local anesthesia. The dentist carefully evaluates the use of vasoconstrictors because excessive adrenergic stimulation may precipitate serious cardiovascular complications. Local anesthetic solution containing adrenaline is absolutely contraindicated in:

During administration of a large dose of local anesthetic, a patient develops signs of systemic toxicity. Initially the patient becomes restless and develops generalized tonic-clonic seizures, followed later by marked CNS depression and respiratory suppression. In systemic local anesthetic (LA) toxicity, which sequence is typically observed?

A hypertensive patient with a history of cardiovascular disease requires dental extraction under local anesthesia. The dentist aims to minimize cardiovascular stimulation while still achieving adequate anesthesia. Which local anesthetic is most suitable for such a patient?

A 60 kg adult patient requires local anesthesia for a prolonged dental procedure. The dentist calculates the maximum safe dose of xylocaine (lidocaine) without adrenaline to avoid systemic toxicity. What is the maximum dose of xylocaine without adrenaline that can be administered to this patient?

During administration of a regional nerve block, the anesthetist explains that different nerve functions are lost in a predictable sequence depending on fiber type and sensitivity to local anesthetics. When blocking a mixed nerve containing both sensory and motor fibers, which functional property is lost last?

A patient with an acute dental abscess receives local infiltration anesthesia, but profound anesthesia is not achieved despite repeated injections. The dentist explains that tissue acidity significantly affects anesthetic effectiveness. Which statement regarding the action of local anesthetics is TRUE?

During a pharmacology viva in oral surgery, a student is asked about the chemical nature of local anesthetic agents and their behavior in solution. Which of the following statements regarding local anesthetics is TRUE?

During administration of maxillary infiltration anesthesia for extraction of an upper molar, the dentist notices incomplete pulpal anesthesia despite proper technique. The thick zygomatic buttress and dense overlying bone are considered responsible for the difficulty. Which maxillary tooth is most difficult to anesthetize by infiltration?

A dentist chooses the Gow-Gates mandibular nerve block technique to achieve profound anesthesia of the mandibular division of the trigeminal nerve during extensive oral surgery. In the Gow-Gates technique, the target area for deposition of local anesthetic is the:

During administration of an inferior alveolar nerve block, the needle is inserted too far posteriorly into the parotid gland region due to improper direction. Immediately afterward, the patient is unable to close the eyelid on the affected side and develops facial muscle weakness. Improper direction of needle insertion during an inferior alveolar nerve block may result in:

A patient with severe trismus and limited mouth opening requires mandibular anesthesia for extraction of a lower molar. The dentist selects a mandibular nerve block technique that can be performed with the mouth closed. Which technique is the closed-mouth mandibular nerve block technique?

During administration of local anesthesia for extraction of a maxillary molar, the patient rapidly develops swelling in the buccal vestibule and cheek region due to accidental injury to a blood vessel during injection. Hematoma formation is most frequently associated with which nerve block?

During administration of a large dose of local anesthetic, a patient develops tonic-clonic convulsions due to systemic local anesthetic toxicity. Emergency management is initiated immediately to control CNS excitation. Toxicity of local anesthesia is most effectively reversed/controlled by:

A dentist prepares to administer 2 mL of 2% lignocaine solution for a routine dental extraction and calculates the total amount of drug being delivered. How much lignocaine is present in 2.0 mL of a 2% lignocaine solution?

During a lecture on nerve physiology and local anesthesia, a postgraduate student is asked which nerve fibers are most sensitive to blockade by local anesthetic agents. Sensitivity to local anesthetics is greatest in:

Immediately after administration of local anesthesia for tooth extraction, a patient becomes pale, sweaty, and briefly loses consciousness. The dentist quickly reclines the chair and monitors the patient’s vital signs. The patient is most likely experiencing:

A patient with a documented allergy to both ester and amide local anesthetic agents requires minor dental treatment. The dentist selects an alternative drug capable of producing local anesthetic effects safely. Which of the following can be used as a local anesthetic in a patient allergic to both amide and ester anesthetics?

During a postgraduate pharmacology seminar, students discuss the properties, toxicity, and clinical uses of various local anesthetic agents used in dentistry and medicine. Which of the following statements regarding local anesthesia is INCORRECT?

During a pharmacology lecture on local anesthetics, students are asked to identify the anesthetic agent that uniquely possesses sympathomimetic activity in addition to local anesthetic action. Which local anesthetic has sympathomimetic properties?

During conscious sedation for a dental extraction, the dentist notices that the patient suddenly stops breathing. Immediate airway management and emergency intervention are initiated. Which respiratory condition is most alarming during patient sedation in a dental clinic?

A dentist administers lidocaine for a routine extraction and waits for adequate pulpal anesthesia before beginning the procedure. The patient reports numbness within a few minutes after injection. What is the usual onset of action of lidocaine?

A highly anxious patient is scheduled for a minor oral surgical procedure under conscious sedation in a dental clinic. The dentist selects a sedative drug group commonly used because of its anxiolytic, sedative, muscle relaxant, and amnesic properties. Which sedatives are most commonly used in dentistry?

During general anesthesia for oral surgery, the anesthetist is cautious while using adrenaline-containing local anesthetic solutions because certain inhalational anesthetic agents can sensitize the myocardium to catecholamines. The action of adrenaline is potentiated in the presence of all of the following EXCEPT:

During administration of a local anesthetic, a patient suddenly develops generalized urticaria, wheezing, hypotension, and difficulty breathing. The dentist diagnoses anaphylaxis and immediately administers emergency treatment. What is the recommended dose of epinephrine in anaphylaxis?

During a pharmacology lecture on local anesthetic mechanisms, students discuss how local anesthetic agents prevent nerve impulse conduction across the nerve membrane. Local anesthetics act on the nerve membrane by:

A patient with an acute dentoalveolar abscess receives local infiltration anesthesia, but profound anesthesia is not achieved despite repeated injections. The dentist explains that infection alters the ionic form of the anesthetic drug, reducing its effectiveness. Local anesthesia is ineffective in infected tissue because of an increase in:

A patient receives prilocaine for a prolonged dental procedure. Shortly afterward, the patient develops cyanosis with low oxygen saturation that does not improve adequately with oxygen therapy. The dentist suspects a known adverse effect associated with prilocaine metabolism. What is the common complication associated with prilocaine?

During recovery from general anesthesia after oral surgery, a patient continues to show prolonged skeletal muscle paralysis following administration of a long-acting non-depolarizing muscle relaxant. The anesthetist administers a reversal agent to restore neuromuscular function. The action of long-acting muscle relaxants used during general anesthesia may be terminated by:

During a discussion on nerve physiology, a postgraduate student asks why local anesthetics tend to block small nerve fibers more rapidly than larger fibers during dental anesthesia. Rapid onset of action of local anesthetics in small nerve fibers is mainly due to:

During administration of local anesthesia, the patient suddenly experiences a sharp tearing sensation as the needle is withdrawn. On examination, the dentist notices that the needle tip is damaged. The sensation of tissue tearing during local anesthesia administration is usually caused by:

During administration of local anesthesia, a patient suddenly develops signs of systemic reaction shortly after injection. The dentist realizes that the anesthetic solution may have entered the bloodstream rapidly due to improper injection technique. An increased incidence of reaction to local anesthesia is most likely caused by:

During a pharmacology discussion on local anesthetic agents, students are asked to identify the anesthetic that possesses intrinsic vasoconstrictive properties among the commonly used agents. Which of the following local anesthetics acts as a vasoconstrictor?

During administration of a large dose of lignocaine, accidental intravascular injection results in markedly elevated plasma levels of the drug. Shortly afterward, the patient develops severe hypotension and cardiovascular collapse. Excess plasma levels of lignocaine can cause cardiovascular collapse primarily due to:

A patient undergoing tooth extraction suddenly becomes pale, dizzy, and loses consciousness briefly after administration of local anesthesia. The dentist recognizes this as a vasovagal fainting episode caused by transient reduction in cerebral blood flow. Syncope is usually caused by:

During a lecture on the history of dental anesthesia, students are asked about the first local anesthetic agent that was successfully introduced into clinical practice. Which was the first local anesthetic used clinically?

During induction of anesthesia for a short oral surgical procedure, the anesthetist selects an inhalational agent known not only for sedation but also for its significant analgesic properties. Which of the following inducing agents possesses analgesic action?

A dentist plans to administer lignocaine with epinephrine for multiple extractions and carefully calculates the maximum safe dose according to the patient’s body weight to avoid systemic toxicity. What is the maximum recommended dose of lignocaine with epinephrine?

A patient undergoes oral surgery under general anesthesia. Within the first postoperative day, the patient develops mild fever, reduced breath sounds, and shallow breathing due to partial collapse of alveoli. What is the most common anesthetic complication occurring within the first 24 hours after surgery under general anesthesia?

During a pharmacology viva, a student is asked about the metabolism and termination of action of ester-type local anesthetics used in dentistry. The activity of procaine is terminated primarily by:

During preparation for a routine dental extraction, the dentist selects the standard concentration of xylocaine (lidocaine) commonly used in dental cartridges for effective local anesthesia. What is the usual strength of xylocaine used in dentistry?

During administration of a local anesthetic injection, the dentist accidentally deposits the solution directly into a blood vessel. Within moments, the patient develops CNS excitation followed by generalized convulsions. What is the most significant adverse consequence of accidental intravenous administration of a local anesthetic?

After administration of local anesthesia for tooth extraction, the patient first notices disappearance of painful sensation while still being able to feel pressure and touch. Which sensation is lost first following administration of a local anesthetic?

A dentist prepares a routine dental local anesthetic cartridge for extraction and selects the concentration of xylocaine with vasoconstrictor that is most commonly used in dental practice for effective anesthesia and hemostasis. Which of the following is the most commonly used local anesthetic preparation?

A patient with a compromised cardiac condition requires dental extraction under local anesthesia. The dentist carefully limits the amount of adrenaline in the anesthetic solution to avoid cardiovascular complications. What is the maximum safe dose of adrenaline in a cardiac-compromised patient?

Before administering local anesthesia, a dental assistant places anesthetic cartridges in alcohol solution for prolonged sterilization. The dentist immediately advises against this practice due to risk of contamination of the anesthetic solution. Why should local anesthetic cartridges not be soaked in alcohol?

A patient undergoing conscious sedation for a dental procedure begins to feel overly sedated. The dentist chooses the route of sedation that can be discontinued and reversed most quickly by simply stopping administration and allowing rapid elimination. Which route of sedation can be reversed most rapidly?

During a dental procedure, an excessive dose of local anesthetic is inadvertently administered. Soon after, the patient becomes dizzy and weak, with falling blood pressure due to cardiovascular depression. With overdose of a local anesthetic agent, one would most likely observe:

A dentist reviews the composition of a local anesthetic cartridge containing a vasoconstrictor. One ingredient is added specifically to prevent oxidation of epinephrine and maintain solution stability. What is the role of sodium metabisulphite in a local anesthetic solution?

During administration of a local anesthetic containing epinephrine, a patient suddenly becomes anxious with rapid heartbeat and tremors. The dentist suspects epinephrine overdose. Symptoms of epinephrine overdose following a local anesthetic injection may include all of the following except:

After an inferior alveolar nerve block, a patient complains of difficulty opening the mouth and pain on jaw movement. Examination suggests post-injection trismus due to trauma to a muscle during needle insertion. Trismus during block anesthesia is usually a result of:

A patient reports an allergic reaction shortly after receiving an amide-type local anesthetic during a dental procedure. On review, the dentist suspects that the reaction was not due to the anesthetic drug itself but to an additive in the cartridge. Allergic reactions in patients receiving amide-type local anesthetics are most likely caused by reaction to:

During a lengthy oral surgical procedure under local anesthesia, a patient receives repeated doses of lignocaine. The dentist monitors for early signs of systemic toxicity, including cardiac changes on ECG. ECG changes are first observed when plasma lignocaine levels exceed:

A patient requires extraction of a mandibular molar. The dentist administers a conventional inferior alveolar nerve block by inserting the needle medial to the ramus to deposit anesthetic near the mandibular foramen. The inferior alveolar nerve block is given in:

During conscious sedation for a dental extraction, the assistant prepares the nitrous oxide cylinder and confirms its standard color coding before connecting it to the anesthesia machine. What is the color of a nitrous oxide cylinder?

A patient presents with an acutely inflamed mandibular molar. The dentist administers local infiltration anesthesia, but profound anesthesia is not achieved despite adequate technique. Why is local anesthetic often ineffective in inflamed tissue?

During administration of local anesthesia, a nervous patient suddenly feels weak and dizzy. The dentist notices an early clinical sign before loss of consciousness occurs. What is the earliest sign of syncope?

For surgical management of a maxillary procedure requiring profound anesthesia, an extraoral maxillary nerve block is planned. The needle is directed toward the pterygopalatine region using external landmarks. For an extraoral maxillary nerve block, the target area is:

A dentist reviews the pharmacokinetics of local anesthetic drugs before treating a patient with renal impairment. After metabolism, the drug and its metabolites are eliminated mainly through one organ. The primary excretory organ for local anesthetics and their metabolites is:

A pediatric patient weighing 40 lbs requires dental treatment under local anesthesia. The dentist calculates the maximum safe dose of 2% lidocaine with 1:100,000 epinephrine before starting the procedure. What is the maximum allowable dose?

A patient is scheduled for a short oral surgical procedure in a day-care setting where rapid induction, good analgesia, smooth maintenance, and quick recovery are required for same-day discharge. Which combination is commonly used for day-care anesthesia?

A patient presents with a deeply impacted lower third molar. The oral surgeon decides to use the classic Kelsey Fry technique, a well-known surgical approach in oral surgery. “Kelsey Fry Technique” refers to removal of:

During a difficult inferior alveolar nerve block, the dentist buffers the local anesthetic cartridge with sodium bicarbonate before administration to improve patient comfort and anesthetic performance. What effect does sodium bicarbonate have when given with local anesthetics?

A patient requires anesthesia for restorative work on the mandibular premolars and anterior teeth. The dentist administers an incisive nerve block at the mental foramen and applies pressure over the site to help anesthetic enter the canal. Which nerves are anesthetized in an incisive nerve block?

A patient with severe trismus requires mandibular anesthesia for oral surgery. Because the mouth opening is limited, the dentist chooses a closed-mouth mandibular block technique that also anesthetizes accessory branches. Which technique blocks the mylohyoid nerve, incisive nerve, and long buccal nerve in a patient with trismus?

While administering an inferior alveolar nerve block, the dentist reviews the contents of the pterygomandibular space to avoid injury to vital structures. Pterygomandibular space contains all of the following except:

During a pharmacology viva, a student is asked to identify which commonly used local anesthetic belongs to the ester group rather than the amide group. Which one of the following local anesthetics belongs to the ester group?

During a dental procedure, an excessive amount of local anesthetic is inadvertently administered. The dentist monitors the patient for systemic toxic effects. All of the following are complications of local anesthetic toxicity except:

A patient is scheduled for a short oral surgical procedure in a day-care setting. The anesthetist chooses an intravenous induction agent that provides rapid onset, smooth recovery, and minimal postoperative drowsiness so the patient can be discharged the same day. Which of the following intravenous induction agents is most suitable for day-care surgery?

During an oral surgery procedure under general anesthesia, the anesthetist asks the new attendant to bring the oxygen cylinder. The attendant must identify it correctly based on standard cylinder color coding. Which cylinder should be brought?

During administration of local anesthesia, the patient accidentally receives an intravascular overdose and develops generalized tonic-clonic convulsions progressing toward status epilepticus. Immediate drug management is required. The agent of choice to reverse status epilepticus induced by local anesthetic overdose is:

During a difficult extraction, an excessive dose of local anesthetic is inadvertently administered. Shortly afterward the patient develops CNS symptoms, and the team reviews the possible toxic effects associated with local anesthetic overdose. Toxic effects of local anesthetics include:

A dental clinic keeps an emergency tray ready for complications related to local anesthesia and sedation. The dentist reviews the drugs that should be available for immediate management. All of the following drugs are used for anesthetic emergencies except:

While administering a posterior superior alveolar (PSA) nerve block for extraction of a maxillary molar, the dentist identifies the standard landmarks before inserting the needle. The anatomical landmarks used during PSA nerve block are mucobuccal fold, occlusal plane, coronoid process and:

While administering an inferior alveolar (mandibular) nerve block, the needle is inserted too far posteriorly into the parotid region. Shortly afterward, the patient develops temporary inability to close the eyelid and weakness of facial muscles on that side. During a mandibular nerve block, which nerve might also get damaged?

During administration of an inferior alveolar nerve block for mandibular third molar extraction, the patient suddenly develops a rapidly appearing dumbbell-shaped swelling in the pterygomandibular region. This swelling is mainly due to:

Before giving a palatal injection, the dentist applies topical lidocaine to numb the mucosa and reduce needle discomfort. What is the maximum concentration of lidocaine commonly used for topical anesthesia?

During a viva on local anesthetic pharmacology, a postgraduate student is asked about the classic theories proposed to explain the mechanism of action of regional anesthesia. Which of the following are theories of regional anesthesia?

A patient is receiving a central nervous system/respiratory depressant before oral surgery. The dentist carefully lowers the dose of local anesthetic to avoid additive toxic effects. Why must the maximum dose of local anesthetic be reduced in this situation?

A patient is scheduled for a difficult mandibular third molar surgery. To provide longer duration anesthesia and extended postoperative pain control, the dentist chooses bupivacaine. Bupivacaine is used in dentistry in which concentration?

During a pharmacology viva, a student is asked about the exact site where local anesthetic acts to block nerve impulse conduction. The site of action of local anesthetic is on:

Before a minor dermatologic procedure in a child, a topical anesthetic cream is applied to the skin to numb the area without injection. Which statement is true regarding EMLA?

While studying the composition of a dental local anesthetic cartridge, a student is asked about the inert gas present in the cartridge to maintain stability and prevent oxidation. Which gas is used in a local anesthetic cartridge?

A patient returns a few days after dental treatment with a painless, fluctuant fluid-filled swelling in the buccal mucosa near the treated area. On examination it appears to be a retention cyst. This lesion is most likely the result of:

Before giving an injection, the dentist applies a topical anesthetic to numb the mucosa. A student asks which local anesthetics are effective when used topically. Which of the following local anesthetics are active topically?

A dentist wants to numb the oral mucosa before a minor procedure without using an injection. He chooses EMLA cream (2.5% lidocaine + 2.5% prilocaine). This eutectic mixture is primarily used for:

A patient becomes pale and briefly loses consciousness immediately after receiving a local anesthetic injection in the dental chair. This represents the most common emergency associated with local anesthesia. The most common emergency seen after the use of local anesthetic is:

A postgraduate trainee is reviewing pharmacology of local anesthetics and is asked to identify the statement that is NOT a property of local anesthetic agents. Properties of local anesthetic include all of the following EXCEPT:

A patient is planned for general anesthesia for oral surgery. The anesthetist avoids using nitrous oxide as the sole anesthetic agent because it cannot safely provide surgical anesthesia by itself. Nitrous oxide alone is not used as a GA agent because of:

A patient complains of a sharp, pricking pain in a tooth on exposure to cold. This type of rapid pain from the dental pulp is transmitted by specific nerve fibers. Fibers which transmit fast pain from pulp are:

While administering a posterior superior alveolar (PSA) nerve block for extraction of a maxillary molar, the dentist advances the needle in the recommended direction toward the posterior surface of the maxilla. In posterior superior alveolar nerve block, the needle is advanced in an:

During a dental procedure, a patient suddenly becomes unconscious in the dental chair. The dentist performs the head tilt maneuver immediately as part of emergency management. The head tilt procedure while dealing with an unconscious patient in dental chair is done to ensure:

A patient undergoes IV sedation for a short oral surgical procedure using Propofol. The trainee is asked to identify the statement that is NOT true about the drug. For Propofol all are true EXCEPT:

A patient with irreversible pulpitis still experiences pain despite infiltration and nerve block. The dentist uses a supplemental technique directly into the pulp chamber only when all other methods fail. Which among the following should be the last resort for giving LA technique to the patient?

A patient with soft palate paralysis presents with hypernasal speech and nasal regurgitation of liquids. The examiner is asked to identify the feature not associated with this condition. When soft palate is paralysed, which is not seen?

A dental student is reviewing why local anesthetics become ineffective in infected tissue. The teacher explains that anesthetic salts must release the active form that penetrates the nerve membrane. The potential action of all the local anesthetics depends upon the ability of anesthetic salt to liberate the free:

A student asks how local anesthetic agents stop transmission of pain during a dental extraction. The mechanism involves blocking ion movement across the nerve membrane. Local anesthetics block nerve conduction by:

A dental student is revising the branches of the mandibular division of the trigeminal nerve before administering mandibular anesthesia. Anterior trunk of mandibular branch of trigeminal nerve supplies all EXCEPT:

A patient undergoing extraction of an impacted mandibular third molar feels less pain when pressure is applied to the surrounding tissues during local anesthetic injection. The pain modulation occurring at the dorsal horn of the spinal cord according to the gate control theory is mainly mediated by:

A patient requires extraction of a maxillary canine. The dentist administers an infraorbital nerve block to anesthetize the anterior maxillary region. Infraorbital anesthesia involves which nerve?

After administering an Inferior alveolar nerve block, the dentist checks for successful anesthesia. The earliest objective sign is loss of sensation on the lower lip and mucosa on the injected side, extending anteriorly toward the midline. Objective signs of inferior alveolar nerve block are seen in:

A patient is given an inferior alveolar nerve block before extraction of a mandibular first molar. After a few minutes, the clinician assesses successful anesthesia by checking the area of numbness over the lower lip and mucosa. The objective signs of a successful inferior alveolar nerve block are seen up to:

During extraction of a mandibular premolar, a clinician administers a periodontal ligament (intraligamentary) injection using 2% lidocaine with epinephrine to obtain profound anesthesia. Following the injection, the effect on pulpal blood circulation is:

A pregnant patient in her second trimester presents with acute dental pain requiring an oral surgical procedure under local anesthesia. The oral surgeon chooses the anesthetic agent with the lowest placental transfer rate to minimize fetal exposure. Which local anesthetic is most appropriate?

A patient requires extraction of a mandibular molar and receives a periodontal ligament (intraligamentary) injection using 2% lidocaine with epinephrine. The clinician explains that this technique produces profound anesthesia partly because of its effect on pulpal blood flow. What happens to the pulp circulation following this injection?

A pregnant woman in her second trimester requires an emergency dental extraction under local anesthesia. To minimize fetal exposure, the oral surgeon selects the local anesthetic agent known to have the lowest placental transfer rate. Which of the following agents is most appropriate?

During administration of an inferior alveolar nerve block, the dentist accidentally injects a local anesthetic solution containing adrenaline (epinephrine) directly into a blood vessel. Within seconds, the patient complains of palpitations and anxiety. Which cardiovascular response is most likely to occur?

A patient with a history of acute hepatitis one month ago requires extraction of an impacted tooth under local anesthesia. Because hepatic function may still be impaired, the oral surgeon prefers a local anesthetic that is not primarily metabolized in the liver. Which of the following is the most appropriate choice?

While preparing for a mandibular third molar extraction, a dentist selects a breech-loading, metallic, self-aspirating, cartridge-type syringe for administration of local anesthesia. Although this syringe has several advantages, one commonly cited disadvantage is:

A patient with chronic infection around the mandibular molars requires a mandibular nerve block. The oral surgeon chooses a technique that anesthetizes the entire mandibular nerve and uses both intraoral and extraoral landmarks, including the intertragic notch and corner of the mouth, to guide needle placement. Which local anesthetic technique is being used?

While administering a Gow-Gates mandibular nerve block for surgical extraction of an impacted third molar, the oral surgeon identifies the extraoral landmarks necessary for proper syringe alignment. Which of the following represents the extraoral landmarks used in this technique?

A 7-year-old child requires extraction of a primary mandibular molar. The dentist considers using articaine because of its excellent diffusion through bone and effectiveness with infiltration anesthesia. Which of the following statements regarding the use of articaine in children is NOT true?

A dentist opens a multidose vial of local anesthetic for use during a minor oral surgical procedure. To prevent bacterial contamination and prolong shelf life, a preservative has been added to the solution. Which preservative is most commonly used in local anesthetic solutions in India?

During extraction of a maxillary third molar, the dentist administers a posterior superior alveolar (PSA) nerve block to anesthetize the maxillary molars. As the needle is advanced through the mucobuccal fold in the maxillary tuberosity region, which muscle is pierced during this injection technique?

Before administering an inferior alveolar nerve block for surgical extraction of an impacted mandibular third molar, the dentist applies a topical anesthetic to the mucosa to reduce needle insertion pain. Which of the following is considered the most potent topical anesthetic?

A healthy 70-kg adult patient is scheduled for surgical removal of impacted third molars under local anesthesia. Before administering multiple cartridges of 4% articaine with epinephrine, the oral surgeon calculates the maximum safe dose to avoid local anesthetic toxicity. What is the maximum permissible dose of articaine in a healthy patient?

A patient is scheduled for extraction of a mandibular first molar. The dentist administers an inferior alveolar nerve block (IANB) and deposits the local anesthetic just before the inferior alveolar nerve enters the mandibular foramen. The anesthetic solution is deposited adjacent to which anatomical landmark?

A dentist administers a local anesthetic for surgical removal of an impacted mandibular third molar. Several factors influence how long the anesthetic effect will last. Which of the following does NOT significantly affect the duration of local anesthesia?

A patient develops prolonged soreness and tissue irritation at the injection site following administration of a local anesthetic for an oral surgical procedure. Among the commonly used local anesthetics, which agent is associated with the highest local tissue irritancy?

A patient develops swelling and signs of infection several days after receiving a classical inferior alveolar nerve block (IANB) for extraction of a mandibular molar. The infection is most likely to involve the fascial space into which the anesthetic solution is normally deposited. Which space has the highest chance of infection following a conventional IANB?