TOMO Final Study Guide

All posterior teeth have their facial heights of contour in the cervical one-third of the crown. The lingual
heights of contour of posterior teeth are in the middle one-third of the crown’s lingual surface, except for:

Mandibular second pre molar on the occlusal one third Lingual View

On both maxillary and mandibular premolars, the cusp tips are located facial to the long-axis bisecting line except for:

The mandibular first premolar facial cusp is located on the long-axis bisecting line

The heart shaped tooth does not have which cusp?

DL cusp

Which teeth have 5 triangular ridges

Maxillary 1st and 2nd Molar (5 triangular ridges in total)

Which cusp of the Maxillary 1st and 2nd Molar has two triangular ridges?

ML cusp 

Where is the groove on the Mandibular 2nd Premolar called?

Distolingual groove

Which teeth have marginal ridges?

All anterior and posterior teeth

When looking at the mandibular first molar from the occusual view, what shape is it?

Pentagon 

When looking at a mandibular first molar from the buccal view, what shape is it?

Trapezoid

How many grooves are on the Central Pit of the Mandibular 2nd Molar

3 (buccal, lingual, and central groove)

On the crown of the permanent mandibular 1st molar, the mesiobuccal groove connects which cusps?

MB and DB cusp

On the crown of the permanent mandibular 1st molar, the distobuccal groove connects which cusps?

DB and distal cusp

Tooth #, Eruption, and Root Formation

#6
11

13

Tooth #, Eruption, and Root Formation

#12 

10

12

Which is the only pre molar with a central pit?

Y type mandibular 2nd pre molar.

What is the order of tooth formation?

Calcification → Tooth eruption → Root Formation

Unique Groove on the Mandibular 1st Premolar

Mesiolingual developmental groove

Tooth #, Eruption, and Root Formation

#28 

10

12

Which teeth are multirooted?

Mx 1st PM, Mn Canine (birfucated root), Mx and Mn molars

Tooth #, Eruption, and Root Formation

#26

7

10

When roots have developmental depressions, they are deeper on the distal surface than the mesial surface except for:

Maxillary first pre molar

Tooth #, Eruption, and Root Formation

#22 Tooth
9
12

Tooth #, Eruption, and Root Formation

#6
11
13

Boundaries of Maxillary Central Incisor

Incisial edge

Distal marginal ridge

Mesial marginal ridge

Cingulum

Deciduous Dentition Eruption Time

Central Incisor- (Mn 6 and Mx 7.5)

Lateral Incisor- (Mn 7 and Mx 9)

Canine- (Mn 16 and Mx 19)

First Molar- (Mn 12 and Mx 14)

Second Molar- (Mn 20 and Mx 24)

Tooth #, Eruption, and Root Formation

#32
17
21

Tooth #, Eruption, and Root Formation

#26

7
10

Which tooth looking facially has a longer Mesial Ridge than Distal Ridge?

Maxillary First Premolar (#5,12)

Which tooth has 4 major cusps and 1 Tubercle?

Mx 1st Molar (#3,14)

Which inclined planes move toward the occlusal surface?

MB and DB:

ML and DL:

MB and DB: either of the lingual inclined planes

ML and DL: either of the buccal inclined planes

What cusps make up the transverse ridge of the maxillary first molar?

MB and ML cusps

What cusps make up the oblique ridge of the maxillary first molar?

DB and ML cusps

Of the crown of the permanent maxillary first molar, the major cusp that is the smallest and most variable in size?

DL cusp

On the occlusal surface of the permanent maxillary first molar, the primary groove parallel to the oblique ridge?

Distolingual groove

On the crown of the permanent maxillary first molar, the primary groove that crosses over the oblique ridge?

Central groove

When does mixed dentition end?

At 12 Years old

The number of posterior teeth in the entire deciduous dentition

8

The total number of point angles on a tooth? Total number of line angles on a tooth?

4 point angles and 8 line angles

The permanent maxillary central incisor begins calcification at?

3-4 months

The dental tissue which composes the majority of the tooth?

Dentin

The following dental formula shows the total number of anterior teeth:

I: 3/3, C: 1/1, PM: 3/2, M: 1/1

8x2= 16