Question 1

All teeth are positioned in the dental arches so that their crowns are oriented or slanted more toward the mesial and their roots have a more distal orientation except:

Accepted Answer

A)  maxillary incisors. 
B)  maxillary molars. 
C)  mandibular incisors. 
D)  mandibular molars.

Question 2

Which of the following statements about furcations is false?

Accepted Answer

A)  Furcation involvement occurs when there is loss of attachment apical to the CEJ. 
B)  Furcations located closest to the CEJ are most likely to become involved with periodontal disease. 
C)  Furcations are generally most cervical on the facial surface of mandibular first permanent molars. 
D)  The more cervical the furcation, the more stable the tooth.

Question 3

If a tooth with one root lost one-third of its attachment length, its loss of attachment surface would be greater than one-third because the root is larger in the cervical one-third of the tooth.

Accepted Answer

A)  Both the statement and the reason are correct, and they are related. 
B)  Both the statement and the reason are correct, but they are not related. 
C)  The statement is correct, but the reason is not. 
D)  The statement is not correct, but the reason is correct. 
E)  Neither the statement nor the reason is correct.

Question 4

Access to and instrumentation on the lingual aspect of No. 30 and No. 31 is complicated by what anatomic feature?

Accepted Answer

A)  Mandibular posterior crowns are inclined more toward the lingual than the roots, making access more difficult. 
B)  Mandibular posterior crowns are inclined more toward the facial than the roots making access more difficult. 
C)  The mandibular first molar mesial furcal concavity makes access more difficult. 
D)  The mandibular second molar mesial concavity makes access more difficult.

Question 5

Teeth with roots that are broad proximally and have narrow facial and lingual surfaces are:

Accepted Answer

A)  maxillary incisors. 
B)  maxillary canines. 
C)  mandibular incisors. 
D)  mandibular canines.

Exam 28: Root Morphology and Instrumentation Implications

All teeth are positioned in the dental arches so that their crowns are oriented or slanted more toward the mesial and their roots have a more distal orientation except:

Which of the following statements about furcations is false?

If a tooth with one root lost one-third of its attachment length, its loss of attachment surface would be greater than one-third because the root is larger in the cervical one-third of the tooth.

Access to and instrumentation on the lingual aspect of No. 30 and No. 31 is complicated by what anatomic feature?

Teeth with roots that are broad proximally and have narrow facial and lingual surfaces are: