General Practice Flashcards

During the swallowing process, which nerve is responsible for elevating the soft palate?

Answer: Vagus nerve

The Vagus nerve (Cranial Nerve X) innervates most of the muscles of the soft palate, pharynx, and larynx. Specifically, it supplies the levator veli palatini muscle, which is responsible for elevating the soft palate during swallowing (deglutition) to prevent food from entering the nasopharynx.

The oral cavity is separated from which body cavity by the palatine bone of the mouth?

Answer: Nasal cavity

The hard palate, which forms the roof of the mouth, is primarily composed of the palatine processes of the maxillae and the horizontal plates of the palatine bones. This bony structure serves as a partition, effectively separating the oral cavity below from the nasal cavity above.

Which vessels are responsible for supplying the buccal gingiva that covers tooth #3?

Answer: Posterior superior alveolar vessels

Tooth #3 is the maxillary right first molar. The posterior superior alveolar artery, a branch of the maxillary artery, supplies the maxillary molars and premolars, as well as the buccal gingiva in that region. Therefore, it is the correct vessel for supplying the buccal gingiva covering tooth #3.

The surgeon notices considerable quantities of blood from the artery that runs medial to the neck of the mandibular condyle while healing an injury to the temporomandibular joint. What artery has been damaged?

Answer: Maxillary artery

The maxillary artery is a major branch of the external carotid artery and is located medial to the neck of the mandibular condyle. It supplies numerous structures in the deep face, including the temporomandibular joint region. Damage to this artery during trauma or surgery in this area would result in significant bleeding.

When glycogen is degraded, which of the following compounds is primarily produced?

Answer: Glucose 1-Phosphate

Glycogen degradation, or glycogenolysis, is primarily catalyzed by glycogen phosphorylase. This enzyme breaks the alpha-1,4 glycosidic bonds in glycogen, releasing glucose units as glucose 1-phosphate. Glucose 1-phosphate is then converted to glucose 6-phosphate for further metabolic use.

The periodontal ligament (PDL) receives its blood supply from the:

Answer: Maxillary artery

The periodontal ligament (PDL) has a rich vascular supply, primarily derived from branches of the maxillary artery. These branches include the superior and inferior alveolar arteries, which give off smaller vessels that penetrate the alveolar bone and supply the PDL fibers, cementum, and alveolar bone proper.

Where does glycogen synthesis generally occur?

Answer: Cytosol

Glycogen synthesis, known as glycogenesis, is a metabolic pathway that occurs primarily in the cytoplasm (cytosol) of cells. While the liver and muscles are the main organs for glycogen storage, the enzymatic reactions for building glycogen from glucose take place within the cytosol.

The conversion of glucose-6-P to glycogen is called:

Answer: Glycogenesis

Glycogenesis is the metabolic process by which glycogen is synthesized from glucose. Glucose-6-phosphate is an intermediate in this pathway, being converted to glucose-1-phosphate and then to UDP-glucose before being added to the growing glycogen chain by glycogen synthase.

Hemoglobin molecules are required for oxygen transportation. Only one oxygen molecule can bind to a molecule of hemoglobin.

Answer: The first statement is true, the second is false

The first statement is true: Hemoglobin is indeed the primary protein responsible for oxygen transportation in the blood. However, the second statement is false: Each hemoglobin molecule is composed of four heme groups, and each heme group can bind one oxygen molecule, meaning a single hemoglobin molecule can bind up to four oxygen molecules.

Which type of tooth is most commonly affected by supernumerary teeth?

Answer: Incisors

Supernumerary teeth, or hyperdontia, are extra teeth that appear in addition to the regular number of teeth. The most common type of supernumerary tooth is a mesiodens, which is typically found in the maxillary anterior region, specifically between the central incisors.

What is the most common cause of localized aggressive periodontitis?

Answer: Bacterial infection

Localized aggressive periodontitis (LAP) is a severe form of periodontal disease characterized by rapid destruction of periodontal tissues. While genetic factors can play a role, the primary and most common cause, like all forms of periodontitis, is a bacterial infection, specifically certain virulent strains such as *Aggregatibacter actinomycetemcomitans*.

Which dental material is commonly used for its biocompatibility and ability to bond to tooth structure?

Answer: Composite resin

Composite resin is a widely used dental restorative material known for its excellent biocompatibility and aesthetic qualities. Its key advantage is its ability to bond adhesively to tooth structure (enamel and dentin) through a bonding agent, allowing for conservative preparations and strengthening the remaining tooth structure.

Which type of dental radiograph is best for detecting interproximal caries?

Answer: Bitewing

Bitewing radiographs are specifically designed to show the crowns of both maxillary and mandibular teeth in a single image, with an emphasis on the interproximal (between teeth) surfaces. This angulation and focus make them the most effective type of radiograph for detecting early carious lesions in these areas, which are often difficult to visualize clinically.

What is the main purpose of a dental sealant?

Answer: Preventing cavities

Dental sealants are thin, plastic coatings applied to the chewing surfaces of back teeth (molars and premolars), where pits and fissures are common. These sealants act as a protective barrier, preventing food particles and bacteria from getting into the grooves and causing cavities (dental caries).

Which dental condition is characterized by the grinding or clenching of teeth, often during sleep?

Answer: Bruxism

Bruxism is the medical term for the involuntary grinding or clenching of teeth, often occurring during sleep or periods of stress. This condition can lead to tooth wear, jaw pain, and headaches. The other options describe different dental issues: gingivitis is gum inflammation, malocclusion is an improper bite, and dental caries are cavities.