DIGESTIVE SYSTEM
TEETH
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which roots have deep concavity or depressions making them difficult to scale?
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mandibular 1st molars
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maxillary 1st premolars
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mandibular cuspids
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mandibular premolars
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Explanation:
Detailed explanation-1: -When considering all premolars, the maxillary first premolar is UNIQUE since it has the only root where the mesial root depression is deeper than the distal root depression.
Detailed explanation-2: -The single-rooted mandibular second premolar has flat to slightly convex surfaces with small concavities on the mesial and distal in the middle one-half of the root.
Detailed explanation-3: -The maxillary first premolar has a prominent mesial concavity that starts at the CEJ. Furcation involvement is usually in the apical one-third of the tooth. The entrance to the furcation is located 6 mm apical to the CEJ. It has narrow facial and palatal root surfaces that may make complete instrumentation difficult.
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