Serefoglu Burcu, Kandemir Demirci Gözde, Miçooğulları Kurt Seniha, Kaşıkçı Bilgi İlknur, Çalışkan Mehmet Kemal
Department of Endodontics, Faculty of Dentistry, Ege University, Bornova, İzmir, Turkey.
Bornova Oral Health Center, Bornova, İzmir, Turkey.
Restor Dent Endod. 2020 Dec 17;46(1):e5. doi: 10.5395/rde.2021.46.e5. eCollection 2021 Feb.
The aim of the current study was to assess whether the amount of extruded debris differs for straight and severely curved root canals during retreatment using H-files, R-Endo, Reciproc and ProTaper Universal Retreatment (PTU-R) files. Additionally, the area of residual filling material was evaluated.
Severely curved ( = 104) and straight ( = 104) root canals of maxillary molar teeth were prepared with WaveOne Primary file and obturated with gutta-percha and AH Plus sealer. Root canal filling materials were removed with one of the preparation techniques: group 1: H-file; group 2: R-Endo; group 3: Reciproc; group 4: PTU-R ( = 26). The amount of extruded material and the area of the residual filling material was measured. The data were analyzed with 2-way analysis of variance (ANOVA) and 1-way ANOVA at the 0.05 significance level.
Except for Reciproc group ( > 0.05), PTU-R, R-Endo, and H-file systems extruded significantly more debris in severely curved canals ( < 0.05). Each file system caused more residual filling material in severely curved canals than in straight ones ( < 0.05).
All instruments used in this study caused apical debris extrusion. Root canal curvature had an effect on extruded debris, except for Reciproc system. Clinicians should be aware that the difficult morphology of the severely curved root canals is a factor increasing the amount of extruded debris during the retreatment procedure.
本研究的目的是评估在使用H锉、R-Endo锉、Reciproc锉和ProTaper Universal Retreatment（PTU-R）锉进行再治疗时，直根管和严重弯曲根管挤出碎屑的量是否存在差异。此外，还评估了残余充填材料的面积。
用WaveOne Primary锉预备上颌磨牙的严重弯曲根管（n = 104）和直根管（n = 104），并用牙胶尖和AH Plus封闭剂进行充填。采用以下一种预备技术去除根管充填材料：第1组：H锉；第2组：R-Endo锉；第3组：Reciproc锉；第4组：PTU-R锉（n = 26）。测量挤出材料的量和残余充填材料的面积。数据采用双向方差分析（ANOVA）和单向ANOVA进行分析，显著性水平为0.05。
除Reciproc组（P>0.05）外，PTU-R组、R-Endo组和H锉系统在严重弯曲根管中挤出的碎屑明显更多（P<0.05）。与直根管相比，每种锉系统在严重弯曲根管中导致的残余充填材料更多（P<0.05）。
本研究中使用的所有器械均导致根尖碎屑挤出。除Reciproc系统外，根管弯曲度对挤出碎屑有影响。临床医生应意识到，严重弯曲根管的复杂形态是再治疗过程中增加挤出碎屑量的一个因素。
