DA Compendium page 4

Question 1

In teeth with only one facial cusp, what is true about the mesial and distal cusp ridge?

Answer 1

Mesial cusp ridge is slightly shorter than the distal cusp ridge

EXCEPTIONS:

1) Maxillary 1st premolar
2) Primary Maxillary Canine

Question 2

Crowns of teeth when measured occlusocervically have what trend in the direction of canine to the 3rd molar?

Answer 2

They get shorter from the canine to the 3rd molar

Question 3

In General, all teeth develop from how many developmental lobes? What are the exceptions?

Answer 3

All teeth develop from 4 lobes

EXCEPTIONS:

1) Perm. Maxillary 1st molar
2) Perm. Mandibular 1st molar
3) 3-cups mandibular 2nd premolar
- **All of the exceptions develop from 5 lobes

Question 4

Generally, which portion of the tooth (mesial or distal) is better developed and measures more occlusocervically as well as cervicoapically?

Answer 4

Mesial portion

Question 5

What is true when comparing like classifications of teeth in relationship to the likelihood of having more supplemental anatomy?

Answer 5

When comparing like classifications of teeth, the more POSTERIOR the tooth, the greater the likelihood

Question 6

Which cusp on the molars will be the largest?

Answer 6

The largest cusp on molars will be the mesial supporting cusp

• Maxillary: ML
• Mandibular: MF

Question 7

The roots of all teeth are inclined where?

Answer 7

Distally

Question 8

How will the canals be oriented if a single root has 2 canals?

Answer 8

They will be oriented one facial and one lingual

Question 9

What is a general rule for determine the amount of pulp horns a tooth will have?

Answer 9

Teeth erupt with as many pulp horns as they have cusps

• The pulp chamber follows the overall outline of the crown so its widest portion will correlate to the widest portion of the crown

Question 10

Name the single molar roots with more than one canal

Answer 10

1) Maxillary 1st molar (MF root)
2) Mandibular 1st molar (M root)
3) Mandibular 2nd molar (M root)
4) Distal roots of Mandibular 1st (31.6%) & 2nd (14.9%) molars

Question 11

Name the single anterior roots with tendencies for more than one canal

Answer 11

1) Mandibular canine (Most likely ANTERIOR)
- has M & D root depressions and is also the anterior tooth most likely to have a bifurcated root
2) Mandibular lateral incisor; M & D root depressions
3) Mandibular central incisor (least likely ANTERIOR)
- has M & D depressions

Question 12

T or F, Maxillary anterior teeth follow the same patterns for single anterior roots with tendencies for more than one canal as do Mandibular anterior teeth

Answer 12

False, Maxillary anterior teeth DO NOT have multiple canals

Question 13

Maxillary Premolars have what pattern with roots and canals?

Answer 13

1st premolar: 2 canals (always) and 2 roots (usually)
- F & L, rarely 3 but if so, MF, DF & L

2nd premolar: Variant pulp morphology can have 2 canals and occasionally 2 roots

Question 14

What Premolar is most likely to have one root and one canal?

Answer 14

Mandibular 2nd

Question 15

Which tooth is the only tooth with a pulp wider mesiodistally than faciolingually?

Answer 15

Maxillary Central incisor

Question 16

Describe the pulp chambers in Maxillary central & lateral incisors

Answer 16

Significant faciolingual taper on tooth so the pulp chambers are triangular when viewed incisally in cross section