Dentistry Trivia Questions Test! Quiz

Permanent maxillary molars have three roots. This is because the maxillary molars are large and have a complex root structure to provide stability and support for the tooth. The three roots are known as the mesiobuccal, distobuccal, and palatal roots. Each root serves a specific purpose in anchoring the tooth in the upper jaw and ensuring proper function during chewing and biting.

The cochlea is the correct answer because it is a structure in the bony labyrinth of the inner ear that is responsible for converting mechanical energy into electrical energy. It contains specialized hair cells that vibrate in response to sound waves, which then generate electrical signals that are sent to the brain for interpretation. The other options mentioned, such as the vestibule, semicircular canals, and chorda tympani, have different functions within the inner ear and do not directly convert mechanical energy into electrical energy.

Acromegaly is a developmental disorder characterized by the excessive production of growth hormone by the pituitary gland, leading to abnormal growth and enlargement of certain body parts. Unlike dwarfism, which is characterized by overall short stature, individuals with acromegaly experience disproportionate growth, particularly in the hands, feet, and facial features. Achondroplasia is a specific type of dwarfism caused by a genetic mutation, while osteogenesis imperfecta is a condition characterized by brittle bones. Therefore, the correct answer for the given question is Acromegaly.

When a person lifts a 20kg dumbbell, the type of contraction that first begins is isometric contraction. Isometric contraction refers to the muscle generating tension without any change in length. In this case, the man is lifting the dumbbell, but the muscle length remains constant. Additionally, the tension in the muscle increases as the man lifts the dumbbell, which is why the correct answer is "Isometric, increases."

Ali is experiencing difficulty in moving his foot towards the plantar surface, indicating a problem with plantar flexion. Plantar flexion refers to the movement of the foot in which the toes are pointed downward, away from the body. This movement is important for activities such as walking, running, and standing on tiptoes. If Ali is having difficulty with plantar flexion, it means he is unable to properly perform these movements, suggesting an issue with the muscles, tendons, or nerves involved in this motion.

The dentist would need to anesthetize the inferior alveolar nerve to work on the tooth with penetrating dental caries. The inferior alveolar nerve supplies sensory innervation to the mandibular teeth and their surrounding tissues. By anesthetizing this nerve, the dentist can ensure that the patient does not feel any pain during the dental procedure.

Osteoclasts are cells that are responsible for breaking down and remodeling bone. They play a crucial role in bone development, growth, and repair. Osteoclasts are able to resorb bone tissue by secreting enzymes and acids that break down the mineralized matrix. This process is important for maintaining bone homeostasis and allows for the removal of damaged or old bone tissue. Osteoblasts, on the other hand, are responsible for bone formation, while osteocytes are mature bone cells that help regulate bone remodeling. Macrophages are immune cells that play a role in the immune response, but they are not directly involved in bone remodeling.

The mesiobuccal cusp is the largest cusp in the occlusal surface of the lower 1st permanent molar. This cusp is located towards the front and outer side of the tooth, making it larger and more prominent compared to the other cusps. It plays a crucial role in the chewing and grinding of food, as it is the first cusp to come into contact with the opposing tooth during occlusion.

The permanent 1st molar is the key of occlusion because it is the largest permanent tooth, its eruption is guided to its correct position just distal to the deciduous molars, and its eruption can never be disturbed since it has no predecessor. However, it is not the last permanent tooth to develop and erupt, which means that this reason does not contribute to its importance as the key of occlusion.

The lower 3rd molar differs from the 1st permanent molar in that it has supplemental grooves and no distal contact area.

When the upper 8 is heart-shaped, the distolingual cusp is the smallest or even absent.

The correct answer is Occulomotor, abducent, trochlear nerves. These are the cranial nerves that innervate the extrinsic ocular muscles. The occulomotor nerve controls most of the eye muscles, including the levator palpebrae superioris, which raises the eyelid, and the superior, inferior, and medial rectus muscles, which move the eye in different directions. The abducent nerve controls the lateral rectus muscle, which moves the eye laterally. The trochlear nerve controls the superior oblique muscle, which moves the eye downward and laterally.

The correct answer is "Electrical signal sent up the Cochlear nerve to the brain." This step is not in its order regarding the mechanism of hearing because it occurs after the sound waves enter the outer ear, the ear drum vibrates with the incoming sound, and the stapes move in and out of the oval window of the cochlea. The electrical signal sent up the Cochlear nerve to the brain is the final step in the process, where the auditory information is transmitted to the brain for interpretation.

The Scala vestibule is a part of the cochlea, which is located in the inner ear. It is one of the three fluid-filled chambers in the cochlea. The Scala vestibule extends from the oval window, which is a membrane-covered opening that connects the middle ear to the inner ear. This opening allows sound vibrations to enter the fluid-filled cochlea and stimulate the sensory cells in the organ of Corti, which is responsible for converting sound waves into electrical signals that can be interpreted by the brain. Therefore, the correct answer is Oval window.

The lateral pterygoid muscle is responsible for protruding the mandible. If there is an incapacity to protrude the mandible, it indicates a dysfunction of the lateral pterygoid muscle.

The superior oblique muscle is responsible for depression of the eye. Depression refers to the downward movement of the eye, allowing it to move in a downward direction. This action is important for various visual tasks such as looking down or reading. The superior oblique muscle works in conjunction with other eye muscles to control eye movement and maintain proper alignment.

The occlusal surface of the lower 1st permanent molar is hexagonal in shape. This means that it has six sides or angles. The hexagonal shape allows for proper alignment and distribution of forces during chewing and biting, ensuring efficient function of the tooth. Additionally, the hexagonal shape provides stability and prevents excessive wear and tear on the tooth, promoting longevity.

Osteogenic cells are the precursor cells that differentiate into osteoblasts, which are responsible for bone formation. Osteoblasts then become osteocytes, which are mature bone cells that maintain the bone tissue. Therefore, the correct sequence for bone cell development is osteogenic-osteoblasts-osteocyte.

The medial rectus muscle is responsible for adduction of the eye when it is in the neutral position. Adduction refers to the movement of the eye towards the midline of the body. The medial rectus muscle is located on the inner side of the eye and contracts to move the eye inward. This muscle works in conjunction with the other muscles of the eye to control eye movements and maintain proper alignment and coordination.

The trochlear nerve is responsible for innervating the superior oblique muscle, which is responsible for moving the eye downward and inward. In this case, the patient is able to look inward, indicating that the abducent nerve (innervating the lateral rectus muscle) is functioning properly. However, the patient is unable to look downward, suggesting that the trochlear nerve is likely involved.