Basic Sciences and Anatomy Flashcards

A patient undergoing a procedure with local anesthesia for the mandibular molars reports numbness of the lower lip, chin, and the anterior two-thirds of the tongue. This indicates the anesthetic has successfully affected which two nerves?

Answer: Mental and Lingual nerves

A successful inferior alveolar nerve block, which is necessary for mandibular molar anesthesia, also affects the lingual nerve due to its close proximity. The inferior alveolar nerve gives rise to the mental nerve, which provides sensation to the lower lip and chin. The lingual nerve is responsible for general sensation to the anterior two-thirds of the tongue.

Which of the following local anesthetics is classified as an ester and is primarily used as a topical agent in dentistry?

Answer: Benzocaine

Local anesthetics are classified as either amides or esters based on their chemical structure. Lidocaine, Articaine, and Bupivacaine are all amide-type anesthetics. Benzocaine is an ester-type local anesthetic and is commonly used in topical preparations to minimize the pain of needle insertion.

During a sedation procedure, the dental anesthesia assistant notices the patient's breathing has become shallow and slow. This condition, caused by the depressant effect of sedative drugs on the central nervous system, is best described as:

Answer: Respiratory depression

Sedative medications, particularly opioids and benzodiazepines, can depress the respiratory centers in the brainstem, leading to a decreased rate and depth of breathing. This is known as respiratory depression. Tachycardia is a fast heart rate, hypertension is high blood pressure, and hypoxia is a state of low oxygen in the tissues, which can be a result of severe respiratory depression.

The trigeminal nerve is the fifth cranial nerve (CN V) and is crucial for dental anesthesia. It divides into three main branches. Which branch provides sensory innervation to the maxillary teeth and surrounding tissues?

Answer: Maxillary nerve (V2)

The trigeminal nerve (CN V) has three major divisions: the ophthalmic (V1), maxillary (V2), and mandibular (V3) nerves. The maxillary nerve (V2) is responsible for providing sensory innervation to the maxillary teeth, palate, and mid-face region.

A patient with a history of significant cardiovascular disease is scheduled for a procedure under moderate sedation. In addition to standard monitoring of blood pressure, pulse oximetry, and respiration, which of the following is most strongly recommended for this patient?

Answer: Continuous ECG monitoring

For patients with significant cardiovascular disease undergoing moderate sedation, continuous electrocardiogram (ECG) monitoring is recommended to detect any potential cardiac dysrhythmias that may be exacerbated by the stress of the procedure or the effects of the anesthetic agents.

Anatomic structures such as a large tongue, enlarged tonsils, or a retrognathic mandible can increase the risk of what complication during sedation?

Answer: Airway obstruction

Anatomical features that reduce the size of the pharyngeal space, such as a large tongue (macroglossia), enlarged tonsils, or a recessed jaw (retrognathia), predispose a patient to airway obstruction, especially when sedative drugs relax the upper airway muscles.