以GT鎳-鈦旋轉器械修形至0.06錐度之根管清潔率評估

Abstract

The success of root canal therapy is related with optimal root canal shaping and cleanliness. How to improve the quality of cleaning and shaping at the same time was interested by the dentists. The aim of this study was to investigate the root canal cleanliness of the coronal, middle and apical levels after preparation with 30/.06 Ni-Ti rotary instruments. Twenty canals were included in this study. System GT Rotary Files were used to prepare the root canals with crown-down technique. The canals were shaped with Ni-Ti alloys in tapers of 0.06 and the apical stop size was 30. The 5.25% NaOCl and 17% EDTA were used to enhance the cleanliness. After the roots were split longitudinally, the scanning electron microscope (SEM) study was to compare the cleanliness of the root canal walls at low (x 200) and high (x 1000) magnifications at the coronal, middle and apical levels to calculate the amounts of debris and smear layer. One-way ANOVA was used to analyze the differences in the amounts of debris and smear layer. The highest scores of the debris and smear layer were found in the apical third, and a significant difference were between apical and coronal third, and between apical and middle third. In summary, the root canal cleanliness of the apical third was the worst than the others. And the cleaning efficiency of root canals after preparation with 30/.06 Ni-Ti rotary instruments was insufficiency.