根尖孔根管偏移方面拔除牙与模拟树脂块的比较。
Comparison of extracted teeth and simulated resin blocks on apical canal transportation.
作者信息
Khalilak Zohreh, Fallahdoost Arjang, Dadresanfar Bahareh, Rezvani Gholamreza
机构信息
Department of Endodontics, Dental School, Islamic Azad University/ Iranian Center for Endodontic Research, Tehran, Iran.
出版信息
Iran Endod J. 2008 Fall;3(4):109-12. Epub 2008 Oct 1.
INTRODUCTION
We aimed to compare apical canal transportation of extracted teeth and two types of simulated resin blocks.
MATERIALS AND METHODS
Mesiobuccal root of extracted maxillary molars, high hardness simulated resin blocks (Knoop hardness=40) and low hardness simulated resin blocks (Knoop hardness=22) were prepared with K-files using step-back technique (n=15 canals in each group). Double exposure radiographic technique was used for extracted teeth. Simulated resin blocks were stabilized and scanned before and after preparation. Pre and post-preparation pictures were superimposed and apical transportation was measured. The data were analyzed statistically using ANOVA and Tukey HSD tests.
RESULTS
There was no significant difference in apical canal transportation between extracted teeth and high hardness resin blocks (P>0.05). Low hardness resin blocks showed more apical transportation than the other groups (P<0.05).
CONCLUSION
Under the conditions of this study, apical canal transportation for extracted teeth and high hardness simulated resin blocks were similar.
引言
我们旨在比较拔除牙和两种类型模拟树脂块的根尖根管偏移情况。
材料与方法
使用K锉采用逐步后退技术制备拔除的上颌磨牙近中颊根、高硬度模拟树脂块（努氏硬度 = 40）和低硬度模拟树脂块（努氏硬度 = 22）（每组15个根管）。对拔除牙采用双曝光射线照相技术。模拟树脂块在制备前后进行固定和扫描。将制备前和制备后的图片叠加并测量根尖偏移。使用方差分析和Tukey HSD检验对数据进行统计学分析。
结果
拔除牙和高硬度树脂块之间的根尖根管偏移无显著差异（P>0.05）。低硬度树脂块比其他组显示出更多的根尖偏移（P<0.05）。
结论
在本研究条件下，拔除牙和高硬度模拟树脂块的根尖根管偏移情况相似。
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