Bezerra Mônica M, Feitosa Victor P, Vivacqua Flávia D, de Vasconcelos Bruno C, Vivacqua-Gomes Nilton
School of Dentistry, São Leopoldo Mandic University, Campus Fortaleza, Fortaleza, Ceará, Brazil.
School of Dentistry, Paulo Picanço Dental School, Fortaleza, Ceará, Brazil.
J Contemp Dent Pract. 2021 Nov 1;22(11):1232-1236.
To evaluate morphologic changes in the main foramen after enlargement with four different systems.
One hundred and twenty canals (buccal of maxillary molars and mesial of mandibular molars) with patency and apical foramen ≤200 µm were included. These apical foramina were photographed and then randomly divided into four experimental groups, according to the ProDesign Logic (PDL), ProDesign R (PDR), twisted file adaptive (TFA), and WaveOne Gold (WOG) systems, all of which were composed of three sequential instruments (Glidepath, #25 and #35). Root canals were prepared 1 mm beyond the main foramen ( = 30). The specimens were photographed again to capture intermediate (#25) and final enlargement (#35) images. These were analyzed using an image software that allowed comparison of the enlarged area and shape of the main foramen.
In the Intragroup comparison, the Friedman's test showed a statistical difference between each phase of foramen enlargement ( <0.05). In the intergroup comparison, the percentage of foramen enlargement showed statistically significant difference between Groups PDR and TFA only in the analysis from #25 to #35, with 42.88 and 67.34% of foramen area widening, respectively. Relative to the final foramen shape, 81.7% were observed to be circular, 17.5% oval, and 0.8% flattened.
Our results showed that foramen enlargement allowed an increase in area, maintained the circular shape of the foramen in the majority of cases, irrespective of the system used, and was a feasible option for use during preparation of the root canal system.
用四种不同系统评估扩大后主要根尖孔的形态变化。
纳入120个通畅且根尖孔≤200 µm的根管（上颌磨牙颊侧和下颌磨牙近中侧）。对这些根尖孔进行拍照，然后根据ProDesign Logic（PDL）、ProDesign R（PDR）、旋转锉自适应（TFA）和WaveOne Gold（WOG）系统随机分为四个实验组，所有系统均由三种连续器械（引导锉、25号和35号锉）组成。根管预备至超出主要根尖孔1 mm（= 30）。再次对标本进行拍照以获取中间（25号）和最终扩大（35号）图像。使用图像软件对这些图像进行分析，该软件可比较主要根尖孔扩大后的面积和形状。
组内比较中，Friedman检验显示根尖孔扩大各阶段之间存在统计学差异（<0.05）。组间比较中，仅在从25号到35号的分析中，PDR组和TFA组的根尖孔扩大百分比显示出统计学显著差异，根尖孔面积分别扩大了42.88%和67.34%。相对于最终根尖孔形状，观察到81.7%为圆形，17.5%为椭圆形，0.8%为扁平形。
我们的结果表明，根尖孔扩大可增加面积，在大多数情况下无论使用何种系统均能保持根尖孔的圆形形状，并且是根管系统预备过程中的一种可行选择。
