Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
Department of Engineering, Manchester Metropolitan University, Manchester, UK.
Technol Health Care. 2024;32(4):2575-2583. doi: 10.3233/THC-231410.
For placement of intraradicular posts the intracanal filling material has to be removed. If drills are employed for this purpose, extra widening of the canal, incomplete cracks or root perforation are probable when inappropriate size of drill is used.
This in vitro study assessed the efficacy of radiographs taken after completion of root canal therapy in selecting the appropriate-sized Peeso reamer for post space preparation.
Canals of 53 extracted maxillary and mandibular teeth of different types were cleaned and shaped. Then with acrylic resin 3-dimensional model of the intracanal space of each tooth was fabricated. Next, all canals were filled with gutta-percha and teeth were radiographed buccolingually. Based on these radiographs two observers selected a Peeso reamer that best matched each canal's diameter. The diameter of the selected Peeso reamer was compared to the diameter of the corresponding resin model of each canal by two independent observers and the difference was measured. The data were analyzed by paired sample t-test using SPSS version 22.
The diameter of the selected Peeso reamers ranged from 0.21 mm smaller to 0.12 mm larger than the diameter of intracanal spaces. The difference between reamer and resin model was less than 0.1 mm in 75% of the cases.
The result of this study suggests that post-operation endodontic radiographs are reliable means for selecting a size of Peeso reamer that does not encroach on dentinal wall during removal of intracanal filling material and post space preparation.
为了放置根管内桩，需要去除根管内的充填材料。如果使用钻头进行此操作，当使用不合适大小的钻头时，可能会导致根管过度扩宽、不完全裂缝或根穿孔。
本体外研究评估根管治疗完成后拍摄的射线照片在选择合适大小的 Peeso 扩孔器进行桩腔预备中的效果。
清洁和成形 53 颗来自上颌和下颌不同类型的离体牙的根管。然后用丙烯酸树脂制作每个牙齿根管内空间的三维模型。接下来，所有根管均用牙胶填充，并进行颊舌向射线照相。根据这些射线照片，两位观察者选择与每个根管直径最匹配的 Peeso 扩孔器。两位独立观察者将所选 Peeso 扩孔器的直径与每个根管相应的树脂模型的直径进行比较，并测量其差异。使用 SPSS 版本 22 对数据进行配对样本 t 检验分析。
所选 Peeso 扩孔器的直径比根管内空间的直径小 0.21 毫米到大 0.12 毫米。在 75%的情况下，扩孔器和树脂模型之间的差异小于 0.1 毫米。
本研究结果表明，术后根管射线照片是一种可靠的方法，可用于选择不会在去除根管内充填材料和桩腔预备时侵犯牙本质壁的 Peeso 扩孔器的尺寸。
