Oral Anatomy Lecture 2

Question 1

What area is implied by the “triangular ridge”

Answer 1

From cusp tip to middle of tooth (only posterior)

Question 2

What are the two marginal ridges?

Answer 2

Mesial and distal

Question 3

Name for the depression created by two triangular ridges coming together into center part of occlusal surface

Answer 3

sulcus

Question 4

What comes together to form a transverse ridge?

Answer 4

Two triangular ridges

Question 5

What are mamelons? Where are they located?

Answer 5

Memelons are a formation of three incisal bumps that usually wear way. They’re present on young kids during eruption.

Question 6

Define Perkymata? When is this present?

Answer 6

Horizontal wave-like ripples of enamel on newly erupted teeth.

Question 7

What’s another name for the major and minor grooves? What grooves fall under each category?

Answer 7

Major (developmental) - includes central groove and fossa grooves.

Minor (supplemental) - includes marginal ridge grooves and extra grooves

Question 8

How many fossae do two-cusped premolars have?

Answer 8

2

Question 9

Is the maxillary curve convex or cocave? What about mandibular?

Answer 9

Covex, concave

Question 10

What is the vertical dimension, at rest, from tip of nose to tip of chin? What about during occlusion?

Answer 10

60 mm, 57 mm

Question 11

Anterior teeth form from how many lobes? Where are they located?

Answer 11

4.

3 facial, 1 lingual

Question 12

Premolars form from how many lobs? Where are they located?

Answer 12

4.

3 facial, 1 per lingual cusp

Question 13

How many lobes form molars? How is this determined?

Answer 13

usually 5 - 1 per major cusp.