ENDODONTIC RETREATMENT IN SMALL AND LARGE CURVED CANALS

This study used a special jig system, photography, and a sonic digitizer to evaluate the change in canal size and location after retreatment in 20 teeth with small or large curved canals (> 23 degrees). During initial instrumentation, small canals enlarged twice as much as large canals in the coronal and middle areas. During retreatment, small and large canals showed 30 to 85% enlargement compared with that of the initial instrumentation. There was a trend, primarily during retreatment, for small canals to deviate more than large canals away from the original canal location.