超声辅助法对两种材料修复髓腔穿孔密度的影响

The Density of Two Repairing Materials filled by Ultrasonic Equipment

目的探讨超声辅助法对两种材料修复髓腔穿孔密度的影响。方法收集新鲜拔除的40颗人恒磨牙,随机分成A、B、C、D4组,在样本髓室底中央制备底穿洞型后,A组用iRoot BP Plus并采用超声辅助法充填,B组为iRoot BP Plus传统充填法组,C组使用超声辅助充填MTA修复底穿孔,D组为MTA传统充填法组。所有样本充填前后,使用分析天平称质量后计算材料密度。每组随机选取6个样本进行Micro-CT扫描,测量经超声辅助充填和传统方法充填髓底穿孔后iRoot BP Plus与MTA的孔隙率。结果两种材料的超声组和传统组之间充填材料的密度比较差异无统计学意义(P>0.05),但两组间MTA与iRoot BP Plus材料孔隙率比较差异具有统计学意义(P<0.05)。结论经超声辅助法充填的MTA及iRoot BP Plus修复髓底穿孔密度优于传统法。

Objective to explore the alteration of density after materials filled by ultrasonic equipment. Methods 40 newly extracted human molars were collected and cleaned completely. All of them were made furcal perforations in the center of the pulp chambers and randomly divided into four groups. In group A, perforations were filled by iRoot BP plus with ultrasonic equipment, while in group B, perforations were filled by iRoot.BP plus with traditional method. In group C, perforations were filled by MTA with ultrasonic equipment, and in group D, perforations were filled by MTA with traditional method. Before and after finishing the filling of perfora- tions, each sample was weighed. Then, 6 samples of each group were randomly chosen to finish the Micro - CT scanning and evaluate the percent of void. Results The difference of materials density in ultrasonic group and traditional group was not statistically significant （P 〉0.05）, but the difference of void percent of the MTA and iRoot BP Plus materials in the two groups was statistically significant（P 〈0.05）. Conclusion The density of repairing material filled by ultrasonic equipment is higher than the traditional method.