Objectives

Non-surgical endodontic retreatment is to be a conservative option over endodontic surgery in case of recurrent infections. Root canal retreatment procedures needs to be initiated faster and proficiently with proper root canal retreatment files. The main aim of this study is to evaluate the remaining root dentin thickness post Gutta Percha (GP) retrieval from the root canal after using two different rotary instruments.

Materials and Methods

A total of sixty extracted single rooted teeth were chosen. Shaping and Cleaning was done Step Back (Telescopic) technique with apical preparation of size 40 k File. Irrigation was carried out using NaOCl (3%) and Ethyelenediamine tetraacetic acid (EDTA) to clear the smear layer. The canals were dried using paper points and obturation was completed using lateral compaction technique with AH plus resin sealer. Upon completing the obturation, it was categorized into two groups: Group I- ProTaper retreatment files (PTR) and Group II- Solite RS3 (S-RS3) Retreatment files. Cone Beam Computed Tomography (CBCT) was used to assess the remaining dentin thickness post gutta-percha retrieval at 3,5 and 7 mm respectively. To test the significance between groups independent t test was used.

Results

It can be noted from the results that more amount of remaining dentin thickness was seen after using Solite RS3 files at 3mm, 5mm and 7mm on the mesial side compared to ProTaper retreatment files (p<0.05). There is no statistically significant difference seen between the files at three levels on the distal side (p>0.05).

Conclusion

Within the limitations of the study, it can be concluded that Solite RS3 files have the potential to preserve the remaining dentin thickness. However, more studies including various other parameters should be performed to arrive at a definitive conclusion.

中文翻译：

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热处理锉刀对牙髓再治疗期间保留剩余牙本质厚度的影响 – 一项体外 CBCT 研究

目标

在复发感染的情况下，非手术牙髓再治疗是比牙髓手术更保守的选择。需要使用适当的根管再治疗锉刀更快、更熟练地启动根管再治疗程序。本研究的主要目的是评估使用两种不同的旋转器械从根管中取出古塔胶 (GP) 后剩余的牙根牙本质厚度。

材料和方法

总共选择了六十颗拔除的单根牙齿。通过后退（伸缩）技术进行整形和清洁，并使用 尺寸为 40 k 的锉刀进行根尖准备。使用NaOCl (3%) 和乙二胺四乙酸(EDTA)进行冲洗以清除涂片层。使用纸尖干燥根管，并使用 AH plus 树脂封闭剂横向压实技术完成封闭。完成闭塞后，将其分为两组：第一组 - ProTaper 再治疗锉刀 (PTR) 和第二组 - Solite RS3  (S-RS3) 再治疗锉刀。锥形束计算机断层扫描 (CBCT) 用于评估古塔胶修复后剩余牙本质厚度分别为 3.5 和 7 毫米。为了检验组间的显着性，使用了独立t检验。

结果

从结果中可以看出，与 ProTaper 再治疗锉刀相比，在近中侧 3mm、5mm 和 7mm 处使用 Solite RS3 锉刀后，可以看到更多的剩余牙本质厚度 (p<0.05)。远端三个级别的锉刀之间没有观察到统计学上的显着差异（p>0.05）。

结论

在研究的限制范围内，可以得出结论，Solite RS3 文件有可能保留剩余的牙本质厚度。然而，应该进行更多的研究，包括各种其他参数，才能得出明确的结论。