Ho Edith Siu Shan, Chang Jeffrey Wen Wei, Cheung Gary Shun Pan
Government Dental Service, Department of Health, the Government of Hong Kong SAR, Hong Kong, HKSAR, China.
Area of Endodontics, Faculty of Dentistry, University of Hong Kong, Saiyingpun, Hong Kong, HKSAR, China.
Restor Dent Endod. 2016 Feb;41(1):22-8. doi: 10.5395/rde.2016.41.1.22. Epub 2016 Jan 4.
The goal of this study was to compare the density of gutta-percha root fillings obturated with the following techniques: cold lateral (CL) compaction, ultrasonic lateral (UL) compaction, and warm vertical (WV) compaction.
Thirty-three extracted mandibular first molars, with two separate mesial canals in each, were selected. After instrumentation, the canals were stratified into three groups based on canal length and curvature, and underwent obturation with one of the techniques. No sealer was used in order to avoid masking any voids. The teeth were imaged pre- and post-obturation using micro-computed tomography. The reconstructed three-dimensional images were analyzed volumetrically to determine the amount of gutta-percha present in every 2 mm segment of the canal. P values < 0.05 were considered to indicate statistical significance.
The overall mean volume fraction of gutta-percha was 68.51 ± 6.75% for CL, 86.56 ± 5.00% for UL, and 88.91 ± 5.16% for WV. Significant differences were found between CL and UL and between CL and WV (p < 0.05), but not between UL and WV (p = 0.526). The gutta-percha density of the roots treated with WV and UL increased towards the coronal aspect, but this trend was not noted in the CL group.
WV compaction and UL compaction produced a significantly denser gutta-percha root filling than CL compaction. The density of gutta-percha was observed to increase towards the coronal aspect when the former two techniques were used.
本研究的目的是比较采用以下技术进行根管充填的牙胶尖密度：冷侧方（CL）加压充填、超声侧方（UL）加压充填和热垂直（WV）加压充填。
选取33颗拔除的下颌第一磨牙，每颗牙有两条独立的近中根管。根管预备后，根据根管长度和弯曲度将根管分为三组，分别采用其中一种技术进行充填。为避免掩盖任何空隙，未使用根管封闭剂。在根管充填前后，使用微型计算机断层扫描对牙齿进行成像。对重建的三维图像进行体积分析，以确定根管每2毫米段内牙胶尖的含量。P值<0.05被认为具有统计学意义。
CL组牙胶尖的总体平均体积分数为68.51±6.75%，UL组为86.56±5.00%，WV组为88.91±5.16%。CL组与UL组之间以及CL组与WV组之间存在显著差异（p<0.05），但UL组与WV组之间无显著差异（p = 0.526）。采用WV和UL技术处理的牙根，牙胶尖密度向冠方增加，但CL组未观察到这种趋势。
与CL加压充填相比，WV加压充填和UL加压充填产生的牙胶尖根管充填物密度显著更高。使用前两种技术时，观察到牙胶尖密度向冠方增加。
