DA Compendium page 2

Question 1

All teeth generally have facial heights of contour at what level of the crown?

Answer 1

Cervical 1/3

- Although mandibular molars are more correctly described as being at the junction of the cervical and middle 1/3

Question 2

Facial heights of contour are also termed what?

Answer 2

“Cervical Ridges”

Question 3

Facial heights of contour extend in what direction?

Answer 3

Mesiodistal direction parallel to the cervical line (CEJ)

Question 4

Facial heights of contour are MOST prominent on what teeth? Where are they LEAST prominent

Answer 4

MOST: mandibular posterior teeth
LEAST: mandibular anterior teeth

Question 5

Lingual heights of contour are located where on all teeth?

Answer 5

Anterior teeth: cervical 1/3 of crown (also termed cervical ridges)
Posterior teeth: middle 1/3 of crown

EXCEPTION: Mandibular 2nd premolar lingual ht of contour is at occlusal 1/3

Question 6

What tooth is the exception to the rules with lingual heights of contour? WHY?

Answer 6

Mandibular 2nd Premolar –> occlusal 1/3

• Due to the diminished lingual crown height and cusp size

Question 7

Cementoenamel junction is also called what?

Answer 7

Cervical line

Question 8

Describe the CEJ on proximal surfaces of teeth

Answer 8

• Dips incisally/occlusally

Question 9

Compare CEJ on anterior and posterior teeth

Answer 9

• Dips more so on ANTERIOR teeth than posterior teeth

Question 10

Compare CEJ on mesial proximal surfaces vs distal proximal surfaces

Answer 10

• Dips more so on the MESIAL proximal surface than on the distal

Question 11

Compare CEJ on Maxillary and Mandibular teeth

Answer 11

• Dips more so on maxillary teeth than on mandibular

Question 12

Where would the most severe curvature of the CEJ be found?

Answer 12

Mesial surface of the maxillary central incisor

Question 13

Where would the least severe curvature of the CEJ be found?

Answer 13

Distal surface of the mandibular 3rd molar

Question 14

How many embrasures can be found on each tooth?

Answer 14

4

1) Occlusal (Incisal)
2) Lingual
3) Gingival
4) Facial

Question 15

Which embrasure is wider in facial vs lingual

Answer 15

Lingual embrasures are wider than facial embrasures on all permanent teeth because of faciolingual convergence
- Generally teeth are wider facially than they are lingually

Question 16

What are the 3 exceptions to the general embrasure rules

Answer 16

1. Maxillary 1st molar
2. 3 cusp variety mandibular 2nd premolar
   - -> Lingual calibration on these two teeth is greater than it is on the facial
3. Mandibular central incisors –> facial and lingual embrasures are described as being the same size

Question 17

List the incisor embrasures from largest to smallest

Answer 17

1. Between Maxillary lateral incisor and Canine (LARGEST)
2. Between Mandibular lateral incisor and canine
3. Between Maxillary central & lateral incisors
4. Between Maxillary Central Incisors
5. Between Mandibular Central & Lateral incisors
6. Between Mandibular Central incisors (SMALLEST)

Question 18

What is the largest overall occlusal embrasure

Answer 18

Between the maxillary canine and 1st premolar