A. Floor of pulp chamber
B. Coronal 1/3 of root
C. Middle 1/3 of root
D. Apical 1/3 of root
The correct answer is D. Apical third of root.
Apical perforations occur through the apical foramen or the body of the root to form a new canal.
The more apical the perforation, the more favorable the prognosis for the tooth. (except for the coronal perforations)
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