The permanent mandibular second molar differs from the permanent mandibular first molar in the number of
1. marginal ridges
2. roots
3. cusps
4. lingual grooves
Dental AnatomyAnswer: 3
Which of the following offers the greatest degree of protection for lips, cheeks, and tongue? 1. Sensory function of the periodontal ligament 2. Adjacent contact of teeth 3. Horizontal overlap (overjet) 4. Deflecting function of ridges
Dental AnatomyAnswer: 3
The period of mixed dentition exist
1. before 6 years of age
2. before the eruption of the permanent incisors
3. when the third molars erupt
4. after the age of 12 years
Dental AnatomyAnswer: 2
Approximately what percentage of root ca is completed at the time the tooth erupts?
1. 25
2. 50
3. 75
4. 90
Dental AnatomyAnswer: 2
On examination of a 7 years old child , only six permanent teeth are p resent. Which of the following is
most likely to be true?
1. Four of the permanent teeth are molars
2. The child has a delayed eruption
3. At least tour of the teeth are perma nent incisors
4. Three permanent teeth are mandibular and the other three are maxillary
Dental AnatomyAnswer: 1
Mandibular premolars differ from maxillary premolars in that, mandibular premolars have all of the following characteristics, except
1. have crowns much more rounded and lingual cusp not so strongly developed.
2. have roots much less flattened mesiodistally and seldom bifurcated
3. they are wider mesiodistally
4. have crowns tilted to the lingual in relation to the long axis of the root
Dental AnatomyAnswer: 3
Which of the following bicuspid are sents the greatest difficulty, when root canal therapy becomes necessary?
1. Maxillary first
2. Maxillary second
3. Mandibular first
4. Mandibular second
Dental AnatomyAnswer: 1
Which of the following anatomic facts should be considered before scaling a permanent maxillary canine?
1 Presence of proximal groove on dis tal surface
2. Presence of proximal groove on me sial surface
3. Presence of a mesial development depression on the crown
4. Presence of proximal grooves on both mesial and distal surfaces
