To achieve the objectives of vertical condensation, it is necessary to produce:: (A) A cylindrical canal, (B) A conical canal, (C) A tapering conical canal, (D) A straight canal
Answer is C. The root canal preparation should develop a continuously tapering cone. This shape mimics the natural canal shape. Funnel-shaped preparation of canal should merge with the access cavity so that instruments will slide into the canal. Thus, the access cavity and root canal preparation should form a continuous channel.
Textbook of endodontics, 3rd edition Nisha Garg, Amit Garg