Zambon da Silva Patrícia, Carlos Ribeiro Francisco, Machado Barroso Xavier Juliana, Pratte-Santos Rodrigo, Demuner Cristina
Federal University of Espírito Santo, Vitória, ES, Brazil.
Department of Dental Clinic, Dental School, Federal University of Espírito Santo, Vitória, ES, Brazil.
Iran Endod J. 2018 Winter;13(1):30-36. doi: 10.22037/iej.v13i1.16800.
The root canal preparation is an important stage in the undergraduate teaching and must be handled with care. Iatrogenic mishaps may occur during this procedure which might compromise the success of endodontic treatment. The aim of this study was to determine, the frequency of iatrogenic errors in endodontic treatments provided by undergraduate dental students at the School of Dentistry of Federal University of Espírito Santo (UFES), Brazil.
Radiographic records of 511 anterior teeth and pre-molars with endodontic treatment performed by undergraduate students, between 2012 and 2014 were randomly chosen. The final sample consisted of radiographic records of 397 teeth endodontically treated and were evaluated by using the projection of radiographic images. Iatrogenic errors that were detected in root filled teeth included: apical perforation, root perforation, furcation perforation, strip perforation, presence of fractured instruments, ledge and zip. Then they were classified, according to the absence or presence of iatrogenic errors, as adequate or inadequate.
According to the results, 7.3% of the teeth were inadequate, and there was no statistically significant difference among the groups of anterior teeth, incisors, or canines (>0.05). A ledge was present in 6.54% of root canals, a zip in 0.75% of root canals, and only one root canal presented a fractured instrument. In teeth with moderate curvature, the root curvature was a factor that possibly influenced the occurrence of the ledge (<0.05).
The majority of root canal preparations showed a low occurrence of iatrogenic errors.
根管预备是本科教学中的一个重要阶段，必须谨慎操作。在此过程中可能会发生医源性失误，这可能会影响牙髓治疗的成功率。本研究的目的是确定巴西圣埃斯皮里图联邦大学牙科学院（UFES）本科牙科学生进行的牙髓治疗中医源性错误的发生率。
随机选取2012年至2014年间本科学生进行牙髓治疗的511颗前牙和前磨牙的X线片记录。最终样本包括397颗接受牙髓治疗牙齿的X线片记录，并通过X线影像投影进行评估。在根管充填的牙齿中检测到的医源性错误包括：根尖穿孔、根管穿孔、根分叉穿孔、带状穿孔、器械折断、台阶和拉链状。然后根据是否存在医源性错误将其分类为合适或不合适。
根据结果，7.3%的牙齿不合适，在前牙、切牙或尖牙组之间没有统计学上的显著差异（>0.05）。6.54%的根管存在台阶，0.75%的根管存在拉链状，只有一个根管出现器械折断。在中度弯曲的牙齿中，牙根弯曲度是可能影响台阶发生的一个因素（<0.05）。
大多数根管预备显示医源性错误的发生率较低。
