Dental Anatomy Incisors

When viewed from the proximal, which tooth and surface has the greatest curvature of its cervical line (cementoenamel junction) when compared to all other teeth in the mouth? 1. #8, mesial surface 2. #9, distal surface 3. #10, distal surface 4. #24, mesial surface 5. #25, distal surface

#8, mesial surface

Which (if any) of the following incisors has its mesial proximal contact at the same level incisocervically as its distal contact due to its symmetry? 1. Maxillary central incisor 2. Maxillary lateral incisor 3. Mandibular central incisor 4. Mandibular lateral incisor

3. Mandibular central incisor

From the following choices, which tooth has the shortest root relative to it's crown? 1. Mandibular central incisor 2. Maxillary lateral incisor 3. Maxillary central incisor 4. Mandibular lateral incisor

3. Maxillary central incisor

Though smaller than the maxillary incisors, mandibular incisors also have ____________ developmental lobes

4

Which statement is the most completely true regarding the wear patterns of the incisal edges of anterior teeth, assuming ideal occlusion? 1. Maxillary incisors are likely to exhibit wear on the lingual part of the incisal edge 2. Mandibular incisors are likely to exhibit wear on the lingual part of the incisal edge 3. Maxillary incisors are likely to exhibit wear on the facial part of the incisal edge 4. Maxillary incisors are likely to exhibit wear on the facial part of the incisal edge and mandibular incisors are likely to exhibit wear on the lingual part of the incisal edge 5. Maxillary incisors are likely to exhibit wear on the lingual part of the incisal edge and mandibular incisors are likely to exhibit wear on the facial part of the incisal edge

5. Maxillary incisors are likely to exhibit wear on the lingual part of the incisal edge and mandibular incisors are likely to exhibit wear on the facial part of the incisal edge

Tooth # 26 has a twist towards which surface?

Distal

Compared to the maxillary incisors, mandibular incisors have much more defined lingual anatomy T/F?

False

___________ are rounded incisal extensions of the labial lobes found on newly erupted or unworn permanent incisor teeth

Mamelons

All but one type of incisor has a mesioincisal angle more square (more acute) than the distal angle. Which is the EXCEPTION?

Mandibular central incisor

Which incisor is considered the most symmetrical?

Mandibular central incisor

Which incisors are most nearly identical in shape?

Mandibular right and left central incisors

The marginal ridges and cingulum of the permanent maxillary central incisor are ____ than those of the permanent mandibular incisor.

More prominent

Which of the following teeth are incisors? a. #6 b. #8 c. #27 d. #10

b & d (#6 & #7)

Viewed from the facial aspect the mandibular lateral incisor is ____________ mandibular central incisor. - Wider or narrower mesiodistally?

wider mesiodistally than the

When holding both an extracted maxillary and mandibular incisor from the same mouth, which characteristic will apply only to the MAXILLARY incisor? 1. The mesiodistal dimension is narrower compared to the incisocervical length 2. The lingual anatomy is more prominent (marginal ridges pronounced and fossa deeper) 3. The incisal edge is lingual to, or centered on the mid-root axis 4. Wear facets slop labially on the incisal edge (that is facets are more evident on the labial surface at the incisal edge as opposed to the lingual surface. 5. Proximal contact areas are located closer to the incisal edge.

2. The lingual anatomy is more prominent (marginal ridges pronounced and fossa deeper)

Which of the following are anatomical features of permanent maxillary central incisors? a) Cingula b) Mamelons c) Cuspal ridges d) Marginal ridges e) Cervical lines f) Triangular ridges

a, b, d, e

The mandibular lateral incisor has a less symmetrical crown than the mandibular incisor AND the mandibular lateral incisor has a pronounced twist to the mesial. Are the statements true or false?

The first statement is true and the second is false.

Which of the following characteristics is seen most of the time on ALL permanent incisors?

The root is longer than the crown

The maxillary lateral incisor is smaller than the maxillary central incisor in all dimensions except the root length.

True