DH 105 - Quiz #2

At approximately what age does the maxillary 2nd premolar erupt?

10 years

At approximately what age does the permanent maxillary canine erupt?

11-12 years

Permanent mandibular canines erupt at approximately 9-10 years of age.

True or False?

True

Which characteristics can be used to distinguish a mandibular canine from a maxillary canine?

a) A mandibular canine has less prominent cingulum (smoother lingual surface)

b) The maxillary cusp tip is sharper than the mandibular cusp tip

c) Mesial side of a mandibular canine crown and root is relatively straight

d) All of the above

All of the above

Which canine has a sharper cusp tip?

Maxillary canine

Viewed from the facial/labial, the maxillary canine crown shape is...

Pentagon

On the mandibular canine, which ridge is nearly horizontal?

Mesial cusp ridge

On a canine tooth, the CEJ curves more on the mesial than on the distal.

True or False?

True

Which canine tooth is the longest tooth in the mouth?

Maxillary canine or Mandibular canine

Maxillary canine

Canine teeth are larger mesiodistally than they are labiolingually.

True or False?

False

Which cusp ridge is longer on a canine tooth?

a) Mesial cusp ridge

b) Distal cusp ridge

Distal cusp ridge

The maxillary canine has a prominent lingual ridge from the cusp tip to the cingulum.

True or False?

True

The prominent lingual ridge on the mandibular canine divides the lingual into two shallow fossae. True or False

False

Like all teeth, the facial height of contour on a canine tooth is on the _____ third.

Cervical

On occasion, which canine root may be divided into labial and lingual roots?

Mndibular canine

The distal side of a mandibular canine crown and root is relatively straight.

True of False?

False

A mandibular canine has less prominent cingulum (smoother lingual surface)

True or False

True

A transverse ridge is made up of...

Two triangular ridges

Which premolar has three occlusal possibilities?

Mandibular 2nd premolar

At approximately what year does the 1st premolar erupt?

10-11 years

How many developmental lobes are in a maxillary 1st premolar?

4; 3 buccal & 1 lingual

All anterior teeth, two-cusped premolars form from how many lobes?

4 lobes

Maxillary premolars look more alike than mandibular premolars.

True or False?

True

Which premolar is typically bifurcated?

Maxillary 1st premolar

Mandibular 2nd premolar is smaller than mandibular 1st premolar.

True or False?

False

What teeth do premolars replace?

Primary molars

What are the two root branches of maxillary 1st premolars?

Buccal, lingual

What part of the mandibular 1st premolar is referred to as "nonfunctioning"?

Lingual cusp

A tooth that has a y-shaped occlusal groove is characteristic of a

three cusp mandibular second premolar

How many cusps does a mandibular 2nd premolar have?

2 or 3

What is a clinical significance for maxillary 1st premolar?

A mesial root concavity- must watch for periodontitis

A characteristic of a mandibular first premolars

Lingual cusps are quite smaller than buccal cusps

What is the only tooth to have mesial cusp slope longer than distal?

Maxillary 1st premolar

Premolars have smaller crowns than anterior teeth.

True or False?

True

What is a transverse ridge?

Two triangular ridges put together

Supplemental grooves extend from the...

Central groove

If a mandibular second premolar has three cusps, what are they called?

Buccal, mesiolingual and distolingual

Mandibular 1st premolars erupt at what age?

10-12 years

Mandibular 2nd premolars erupt at what age?

11-12 years

Maxillary 2nd premolars have shallow depressions on the mesial root surface

True or False

True

Maxillary 1st premolars are larger than maxillary 2nd premolars.

True or False?

True

Cusp locations for 3-cusp mandibular 2nd premolars

Buccal, distolingual, mesiolingual

Which premolar has a pronounced concavity (fossa) on the cervical part of mesial surface of the crown?

Maxillary first premolar

Mesial marginal groove is extended into middle third of crown of which tooth?

Maxillary 1st premolar

What are the distinguishing features of a mandibular 1st premolar?

- Looks similar to a mandibular canine

- Lingual tilt of crown

- Non-functioning lingual cusp

What is the outdated term for premolars?

Bicuspids

How many roots do maxillary 1st premolars have?

2

When do maxillary 2nd premolars erupt?

10 years

When compared to other premolars, which of the following characteristic is unique to a mandibular first premolar?

There is a mesiolingual groove crossing onto the mesiolingual surface

On the mandibular 1st premolars, the mesiobuccal cusp ridge is ____ than the distobuccal cusp ridge

shorter

Which lingual cusp of mandibular 2nd premolars is the largest?

Mesiolingual (ML)

A maxillary first premolar can have 1 or 2 lingual cusps.

True or False?

False

How many lobes are present in maxillary 1st premolars?

4; 3 facial & 1 lingual

Maxillary 2nd premolars develop from ____ lobes and have ____ root(s).

- 4

- 1

Which tooth is most likely to have a large buccal cusp and a much smaller non-functional lingual cusp?

Mandibular first premolar