new method for location of a difficult-to-find root canal orifices: an in-vitro study

ABSTRACT

In this study, Nd YAG laser was used as an aid to facilitate the detection of the difficult-to-find orifices of the main and extra root canals. Eighty human extracted teeth were used. The teeth were divided into two groups, forty teeth each. In group I, access cavities according to Black's principles were prepared. In group II, cervical cross-sections were performed. Using Nd YAG laser at power 15 pps/1.5 w for 1/2-1 minute, applying it to the access cavities and the prepared cervical cross-sections, resulted in black dicoloration and accentuation of the most of the existing main and extra orifices of the root canals. The dark black discoloration might result from carbonization of the organic contents of the canals. This laser effect facilitated the detection of the difficult-to-find orifices and the identification of most of the orifices of the extra canals