The use of rotary instruments as auxiliary aids to root canal preparation of molars
Recent endodontic studies have dis cussed various methods of root canal preparation. Some of these studies have raised questions about the effec tiveness of hand instrumentation. Gutierrez and Garcia1 showed that endodontic instrumentation leaves areas of the root canal unprepared. Haga2 showed that instrumentation to a size 0.35 file did not smooth the canal walls. Davis and others 3 and Laws4 considered the elimination of morphologic aberrations an important criterion for satisfactory root canal preparation.
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