镍钛旋转器械在模拟S形根管中的塑形能力。

Shaping ability of nickel-titanium rotary instruments in simulated S-shaped root canals.

作者信息

Madureira Rui Gonçalves, Forner Navarro Leopoldo, Llena Mari Carmen, Costa Marcia

机构信息

Centro de Investigação em Ciências da Saúde, Instituto Superior de Ciências da Saúde-Norte, CESPU, Gandra, Portugal.

出版信息

Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2010 Feb;109(2):e136-44. doi: 10.1016/j.tripleo.2009.09.020. Epub 2009 Dec 6.

DOI:10.1016/j.tripleo.2009.09.020

PMID:19969482

Abstract

OBJECTIVE

The aim of this study was to compare the shaping ability of 4 nickel-titanium rotary techniques and 1 hand technique in simulated S-shaped curved root canals.

STUDY DESIGN

Seventy-five simulated double-curved resin root canals were divided into 5 groups (n = 15). The canals were compared at 12 different levels and at 3 different times: before preparation and after preparation to master apical 25 and 35. Data were statistically analyzed by performing 2-by-2 comparisons with the Tukey parametric test of variance analysis using a confidence interval of 95%.

RESULTS

All of the 75 resin blocks presented transportation of the root canals by transforming the apical curvature into a straight zone and straightening the first curvature. When increasing the diameter from 25 to 35, both curvatures were straightened.

CONCLUSIONS

Based on the conditions of this study, we can say that the flexibility of the instruments is inversely related with the transportation of the root canals, and that in the double-curved root canals, the apical curvature is always straightened.

摘要