de Alencar Ana Helena Gonçalves, Dummer Paul M H, Oliveira Henrique César Marçal, Pécora Jesus Djalma, Estrela Carlos
Dental School, Federal University of Goiás, Goiânia, GO, Brazil.
Braz Dent J. 2010;21(6):543-9. doi: 10.1590/s0103-64402010000600011.
This study detected procedural errors created by rotary nickel-titanium (NiTi) instruments during root canal preparation by two imaging methods. Forty extracted human maxillary and mandibular molars were divided randomly into two groups and treated by two endodontists (n=10) and two undergraduate dental students (n=10). The ProTaper Universal Rotary System was used to shape the canals and then they were filled using AH Plus sealer and gutta-percha. Periapical radiographs (PR) and cone beam computed tomography (CBCT) images were obtained and two examiners, who evaluated them to verify the occurrence of procedural errors (fractured instruments, perforations, and canal transportation). The Chi-square test at 0.05 level of significance was used for statistical analyses. There were no significant differences (p>0.05) between the imaging methods. In the analysis of procedural errors, there was no significant difference (p>0.05) between the groups of operators (endodontists vs. students) nor between tooth groups (maxillary molars vs. mandibular molars). In view of the low incidence of procedural errors during root canal preparation performed by students the introduction of rotary NiTi instruments has potential in undergraduate teaching. PR and CBCT permitted the detection of procedural errors, but the CBCT images offer more recourse for diagnosis.
本研究通过两种成像方法检测了旋转镍钛（NiTi）器械在根管预备过程中产生的操作失误。40颗拔除的人类上颌和下颌磨牙随机分为两组，分别由两位牙髓病医生（n = 10）和两名牙科本科生（n = 10）进行治疗。使用ProTaper通用旋转系统对根管进行塑形，然后用AH Plus封闭剂和牙胶进行充填。获取根尖片（PR）和锥形束计算机断层扫描（CBCT）图像，由两位检查者对其进行评估，以核实操作失误（器械折断、穿孔和根管偏移）的发生情况。采用显著性水平为0.05的卡方检验进行统计分析。成像方法之间无显著差异（p>0.05）。在操作失误分析中，操作者组（牙髓病医生与学生）之间以及牙组（上颌磨牙与下颌磨牙）之间均无显著差异（p>0.05）。鉴于学生在根管预备过程中操作失误的发生率较低，旋转NiTi器械在本科教学中具有应用潜力。PR和CBCT均可检测到操作失误，但CBCT图像为诊断提供了更多依据。
