An in vitro method for comparing the effcts of different root canal preparation techniques on the shape of curved root canals

Abstract

This study introduced an in vitro model which was designed to observe the effects of instrumentation on the shape of curved root canals. The model may be accurately rotated through 90 degrees allowing reproducible radiographs to be taken from two different angles. The root canals were filled with a radiopaque contrast medium before radiographs were taken. Two-dimensional evaluation of the shape of the root canals, before and after preparation was made on enlarged photographic prints obtained from the radiographs. A custom-made grid was used as a guide for measurement and accurate transfer from the pre- to postpreparation prints. Reproducibility of measurement was within 4 per cent. This method is feasible for quantitative comparison of the effect of instrumentation on the shape of root canals.

An in vitro comparison of canal preparation using two automated rotary nickel–titanium instrumentation techniques

“…A previously established radiographic technique was used in this study ( Tang & Stock 1989, Abdo 1994), but modified according to Luiten et al . (1995) to use mercury in order to enhance contrast and eliminate the problem of removal of isopaque.…”

Ultrasonics in Endodontics: A Review of the Literature

“…Several studies have shown that ultrasonically or sonically prepared teeth have significantly cleaner canals than teeth prepared by hand instruments (14,(147)(148)(149)(293)(294)(295)(296). Numerous studies have analyzed the different characteristics of ultrasonically activated files, such as cutting efficiency (11,12,(297)(298)(299)(300)(301)(302), effect on bacteria (168,303,304), characteristics of root canal preparation (153,(305)(306)(307)(308)(309)(310)(311)(312)(313), mechanical and technical features of files and handpieces (314 -318), and clinical implications (319 -323).…”

A combined radiographic and computerized scanning method to evaluate remaining dentine thickness in mandibular incisors after various intracanal procedures

“…The amount of the residual opaque medium remaining in the canal following preparation demonstrates the areas of insufficient cleaning (Littman 1977). Other experiments using radiopaque materials to visualize root‐canal morphology have also been conducted (Mayo et al . 1986, Tang & Stock 1989, Scarfe et al .…”