Pin used in pin restoration of a root canal | AIPGDEE Preparation MCQs with Explanations

The pin used in pin restoration of a root canal treated tooth is:

A. Self threaded pin              
B. Cemented pin
C. Frictional pin                  
D. TMS pin

      Ans. (B) Cemented pin: “Because the cemented pin does not produce internal stress and craze lines in the dentin, it is the pin of choice for use in the restoration of root canal treated teeth.” Types of pins are cemented, friction locked and self threading pins. The diameters and extensions of pins have been discussed elsewhere. Here we present a few other points: Retention of pins in ascending order:Cemented pin < Friction locked pins < self threading pins

Pulpal Stress: Self threading pin > friction locked pins > cemented

- TMS (Thread mate System) is the most widely used self threading pin.                      - TMS pin sizes

- Minikin - 0.48 mm (0.019 inch)                 - Minuta - 0.38 mm (0.015 inch)                - Minim - 0.61 mm (0.024 inch)

- Pin extension into dentin and amalgam greater than 2 mm is unnecessary for pin retention and is contraindicated to preserve the strength of the dentin and amalgam(AIPG-2007)Questions regarding pin retained restoration are frequently asked in All India examination. So please go through the whole chapter on this in Sturtevant 4th and 5th edition.