目的:这项离体研究旨在评估不同的填充技术对从填充有生物陶瓷密封剂的椭圆形根管中去除填充物的影响。
方法:用生物陶瓷封口剂填充具有单个椭圆形管的36个下颌切牙(n=12):单锥,改良的McSpadden,或连续的冷凝波,并通过微型计算机断层扫描(micro-CT)扫描。使用Clearsonic超声尖端和Reciproc系统去除填充物,直到R40仪器,并记录了工作时间。通过显微CT再次扫描牙齿。填充材料的剩余体积百分比(mm9.3),牙本质厚度,并测量根管运输。使用显著性水平为5%的参数和非参数检验对数据进行分析。
结果:使用连续波冷凝技术(p<0.05),需要更多的时间才能清除填充材料,其次是改良的McSpadden和单锥技术。三组间剩余填充材料百分比比较无差异(p>0.05)。每颗牙齿的片段也没有。比较各组时,牙本质厚度和运输的分析也没有差异(p>0.05)。
结论:填充技术不影响剩余填充材料的量,牙本质厚度,和交通。使用热塑性填充技术的工作时间更长。
结论:填充生物陶瓷密封剂的牙齿的牙髓再治疗随着其使用而增加。几种技术被用来填充根管,因此,重要的是要知道填充技术是否影响非手术牙髓再治疗。
OBJECTIVE: This ex vivo study aimed to evaluate the influence of different filling techniques on the filling removal from oval root canals filled with bioceramic sealer.
METHODS: Thirty-six mandibular incisors with single oval canals were filled with bioceramic sealer following the techniques (n = 12): single-cone, modified McSpadden, or continuous wave of condensation, and scanned by micro-computed tomography (micro-CT). The filling was removed using the Clearsonic ultrasound tip and Reciproc system up to the R40 instrument, and the working time was recorded. The teeth were scanned again by micro-CT. Percentage of remnant volume (mm³) of the filling material, dentin thickness, and root canal transportation were measured. The data was analyzed using parametric and non-parametric tests with a significance level of 5%.
RESULTS: It took more time to remove the filling material using the continuous wave of condensation technique (p < 0.05), followed by the modified McSpadden and single-cone techniques. There was no difference (p > 0.05) when comparing the percentage of remaining filling material among the three groups, nor did it among the segments of each tooth. There was also no difference in the analysis of dentin thickness and transportation when comparing the groups (p > 0.05).
CONCLUSIONS: The filling technique did not influence the amount of remaining filling material, dentin thickness, and transportation. The working time was longer with thermoplastic filling techniques.
CONCLUSIONS: Endodontic retreatment in teeth filled with bioceramic sealers increases with their use. Several techniques are used to fill the root canals, thus, it is important to know whether the filling technique influences the non-surgical endodontic retreatment.