Oral Anatomy Review Questions

How many triangular ridges are visible on a 3-cusp type permanent mandibular second premolar?

3

The crowns of all primary teeth begin to calcify between?

4 to 6 months in utero

From a developmental viewpoint, all mandibular molars have ___ major cusps, whereas maxillary molars have only ___ major cusps.

4;3

Mature enamel contains the following percentage of mineralized or inorganic material

96%

Any linear elevations on the surface of a tooth is called?

A ridge

The trapezius and sternocleidomastoid muscles receive motor innervation from the?

Accessory nerve

The location of the HOC on the facial and lingual surfaces of the crowns can best be seen from the mesial and distal views, and is usually located in either the cervical or middle third. The location of the HOC on the facial surface of all crowns is located in or near the cervical thirds.

Both are true.

A linguogingival groove may be present on the root and possible on the crown of the maxillary lateral incisor. A maxillary lateral incisor has a single conical root that is relatively smooth and straight but may curve slightly to the distal.

Both statements are true

Which muscle is responsible for keeping mucous membranes out of the plane of occlusion and foot out of the buccal vestibule?

Buccinator

The dental tissue which most closely mimics bone is?

Cementum

What classification of malocclusion has the following characteristics? First molars are in class II and permanent maxillary central incisors (and maybe laterals) are protruded with deep overbite, and gothic palate.

Class II division I

At the TMJ, hinge movement occur between the?

Condyle and articular disc

Which of the following line angles is least square?

Distoincisal of the mandibular lateral incisor

The submandibular gland receives its principal arterial supply via which artery?

Facial

How many point angles dose each tooth have?

Four

When assessing the furcation involvement on the mesial aspect of tooth 14, the hygienist should check from the buccal aspect of the tooth because the mesial furcation is located more toward the buccal surface than toward the lingual surface.

Neither the statement or reason is correct

A hockey player beings his maxillary right premolars into the office, what would you use to distinguish first from second?

Number of roots, symmetry, mesial to distal cusp ridge ratio, and central groove size and supplemental groove number.

Which of the following fiber groups of the alveolodental ligament is the most numerous of the fiber groups and covers the apical two thirds of the root?

Oblique group.

During a surgical extraction of the maxillary first molar, the surgeon accidental perforates the maxillary sinus. If this is done with the root of the first molar, which root is it given that it is the largest, longest, and strongest of the three roots?

Palatal

Nonsuccedaneous teeth include all of the following except:

Permanent maxillary and mandibular premolars.

All of the following are characteristics of primary teeth:

Primary teeth have pronounced buccocervical ridges that constrict at the CEJ, primary occlusal tables are narrower faciolingually than permanent occlusal tables, and pulp chambers are larger and pulp horns extend more occlusally than permanent tooth pulps.

A preschool child has spaces between the maxillary lateral incisor and the canine, and the mandibular canine and the first primary molar. These spaces are termed _____ and their presence allows for the space to be filled by permanent teeth as they erupt

Primate spaces

Which nerve innervate the pharynx?

Vagus provides motor innervation except the stylopharyngeus. Sensory innervation is by the glossopharyngeal nerve.

The application of excessive heat to a tooth results in pain because:

all stimuli to the pulp results in a pain sensation

The lamina dura is comprised of which type of bone?

bundle bone

Which of the following lymph node groups extend from the base of the skull to the root of the neck?

deep cervical nodes

All of the following are lined by keratinized mucosa:

dorsum of the tongue, hard palate, external gingival tissues

The branch of the trigeminal nerve that innervates the midface, palate, and paranasal sinus exits the cranial cavity through which structure?

foramen rotundum.

Which permanent tooth has a mesial surface that is in a straight line with the mesial surface of the root?

mandibular canine.

All of the following make up the articulating parts of each temporomandibular joint:

mandibular condyle, articular fossae and articular eminence, and the articular disc

Which tooth is most likely to have a pronounced concavity on its mesial surface?

maxillary first premolar

The anterior and posterior pillars of the fauces enclose which area of lymphoid tissue?

palatine tonsils

Morphologically, the primary maxillary second molar strikingly resembles the

permanent maxillary first molar

The outline of the crown of a maxillary second molar is narrower mesiodistally than that of the maxillary first molar but is almost the same width buccolingually. Two crown outline types are possible on the maxillary second molar when viewed from the occlusal:

rhomboid and heart shaped.

The most distinguishable difference between the maxillary first and second premolar is:

the number of roots

When looking at the facial or lingual aspect of all anterior teeth, they have a?

trapezoidal outline.

What provides motor supply to the muscles and MATT?

trigeminal V3

All of the muscles of the soft palate participate in closing the nasopharynx during swallowing:

uvular muscle, palatopharyngeus muscle, tensor veli palati muscle, and levator veli palati muscle

The nerve that innervates temporalis also innervates which muscle?

Mylohyoid

A pediatric patient complains of severe pain on chewing. You see an eruption cyst in the place of the mandibular second molar. What is the age of this patient?

12

In an ideal intercuspal position, the mesiobuccal cusp of the permanent maxillary first molar opposes the:

Mesiobuccal/buccal groove of the mandibular first molar.

The human deciduous dental formula is?

I2/2C1/1M2/2 = 10x2=20

Patient comes in with chewing difficulties. When you ask him to protrude the mandible, it deviates to the left. Which muscle inserts fibers into the capsule and articular disc of the TMJ, is most likely damaged?

Left lateral pterygoid muscle.

A mother brings her 1 year old in the day after her first birthday. What primary teeth do you expect to see?

Mandibular and maxillary incisors.

Which permanent teeth occlude with only one tooth in the opposite jaw, assuming ideal relations exist?

Mandibular central incisors.

A patient walks into your office holding three crowns and claims they fell out. You notice that one of the crowns has a mesiolingual developmental groove. This is a dead giveaway that the tooth is a

Mandibular first premolar.

The dental assistant in your office drops an entire box of prefabricated temporary crown restoration on the ground. He wants help putting them back. The hardest tooth to distinguish left from right is the?

Mandibular second molar.

Which of the premolars is characterized by development from 5 lobes?

Mandibular second premolar.

What is the major arterial origin supplying the mandibular anterior teeth?

Maxillary artery

Which primary tooth has a longer mesial cusp ridge than distal cusp ridge?

Maxillary canine

Which premolar is the only one that has a mesial buccal cusp ridge that is longer than its distal buccal cusp ridge?

Maxillary first premolar

In which teeth will we most likely see a bifurcation in the apical third of the root?

Maxillary first premolars

The largest of all the premolars are the ____ and the smallest are the _____.

Maxillary first, mandibular first

Which teeth have the most variable crown shape of all permanent teeth?

Maxillary third molars

All of the longitudinal muscles of the pharynx are innervated by the vagus nerve via the pharyngeal plexus except one. Which one is the exception:

Stylopharyngeus

Which salivary gland can have either numerous small ducts that open onto the floor of the mouth or single main excretory duct (bartholin's) that empties at the sublingual caruncle?

Sublingual gland

What branches of the facial nerve supply the muscles of facial expression?

Temporal, zygomatic, buccal, mandibular, cervical (two zebras bit my car)

What is not true regarding the mandibular lateral incisor?

The cingulum is directly in the center of the lingual surface.

All of the following are true concerning developmental groove:

They are formed during tooth development, they separate primary parts of the crown or root, they are important escape ways for cusps during lateral and protrusive jaw motions for food particles in mastication. They are SHALLOW grooves between parts of crown and root.

How many roots are visible from the buccal aspect of a maxillary first molar?

Three roots