AIM To compare the perceptions of students when using five different tooth replicas and to detect common errors in the performance of students that might be attributed to a specific type of tooth replica. METHODOLOGY Five groups (n = 10 each) of artificial first maxillary molars (DEPT, DRSK, Nissin, DENTALIKE and TrueTooth) were used. All 50 teeth were mounted individually in opaque containers, distributed in 10 packages containing a sample from each with an assigned random order for students to perform root canal treatments. Ten postgraduate students each performed a root canal treatment on the five replicas, in the assigned order, and completed a satisfaction questionnaire. Three trained and calibrated endodontic educators, each with more than 15 years of experience, evaluated their performance using a grading rubric and completed a questionnaire to detect common errors attributed to a specific tooth replica. Inter-rater reliability was calculated with the interclass correlation coefficient for both consistency and absolute agreement. A two-way related measures anova was used to assess the interaction amongst evaluators and tooth groups on the average scores of students. Post hoc T3 Dunnet was used to compare groups. The perceptions of students amongst groups were compared with chi-square and linear-by-linear association tests. RESULTS Inter-rater reliability was very high for both consistency (ICCC = 0.939; 95% confidence interval (CI) 0.902-0.964) and absolute agreement (ICCA = 0.940; 95% CI 0.904-0.965). No significant differences were found amongst the ratings of evaluators; however, students performed differently when using the various tooth replicas (P < 0.05). Overall, 60% of students preferred the DRSK replica for root canal treatment training purposes, followed by DENTALIKE (30%). The least preferred was TrueTooth (70% responses) due to its complex anatomy and poor resistance to instruments and heat pluggers. Evaluators detected several common errors in specific tooth replicas and preferred tooth replicas manufactured based on microCT scans of natural teeth. CONCLUSIONS Tooth replicas manufactured based on microCT scans of natural teeth (TrueTooth and DENTALIKE) had much better acceptance amongst evaluators, although students rated and performed less well in TrueTooth replicas due to their greater level of difficulty.

中文翻译：

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不同牙齿复制品在牙髓治疗中的适用性：感知和发现研究生表现中的常见错误。

目的比较使用五种不同牙齿复制品时学生的看法，并发现可能归因于特定类型牙齿复制品的学生表现中的常见错误。方法学使用五组（每组n = 10）人造第一上颌磨牙（DEPT，DRSK，Nissin，DENTALIKE和TrueTooth）。将所有50颗牙齿分别安装在不透明的容器中，分为10个包装，每个样品中都包含一个样品，并分配了随机顺序，以供学生进行根管治疗。十名研究生每人按照分配的顺序对五个复制品进行了根管治疗，并填写了满意度调查表。三名经过培训和校准的牙髓教育者，每位都有超过15年的经验，使用评分规则对它们的性能进行评估，并完成了调查表以检测归因于特定牙齿复制品的常见错误。使用一致性和绝对一致性的类间相关系数计算评分者间的可靠性。一项与双向相关的方差分析被用来评估评估者与牙齿群体之间在学生平均分数上的相互作用。特设的T3 Dunnet被用来比较各组。将各组学生的看法与卡方检验和线性逐线性关联检验进行比较。结果一致性（ICCC = 0.939； 95％置信区间（CI）0.902-0.964）和绝对一致性（ICCA = 0.940； 95％CI 0.904-0.965）的评分者间信度都很高。在评估者的等级之间没有发现显着差异。然而，在使用各种牙齿复制品时，学生的表现有所不同（P <0.05）。总体而言，有60％的学生更喜欢将DRSK复制品用于根管治疗培训，其次是DENTALIKE（30％）。最好的选择是TrueTooth（70％的响应），因为其解剖结构复杂且对器械和热插拔器的抵抗力较差。评估人员检测到特定牙齿复制品和基于自然牙齿的microCT扫描制造的优选牙齿复制品中的几个常见错误。结论基于microCT天然牙齿（TrueTooth和DENTALIKE）的牙齿复制品制造的牙齿复制品在评估人员中的接受度更高，尽管学生对TrueTooth牙齿复制品的评价和表现较差，原因是难度较高。60％的学生更愿意将DRSK复制品用于根管治疗培训，其次是DENTALIKE（30％）。最不优选的是TrueTooth（70％的响应），因为其复杂的解剖结构以及对器械和热插拔器的抵抗力较差。评估人员检测到特定牙齿复制品和基于自然牙齿的microCT扫描制造的优选牙齿复制品中的几个常见错误。结论基于microCT天然牙齿（TrueTooth和DENTALIKE）的牙齿复制品制造的牙齿复制品在评估人员中的接受度更高，尽管学生对TrueTooth牙齿复制品的评价和表现较差，原因是难度较高。60％的学生更喜欢将DRSK复制品用于根管治疗培训，其次是DENTALIKE（30％）。最不优选的是TrueTooth（70％的响应），因为其复杂的解剖结构以及对器械和热插拔器的抵抗力较差。评估人员检测到特定牙齿复制品和基于自然牙齿的microCT扫描制造的优选牙齿复制品中的几个常见错误。结论基于microCT天然牙齿（TrueTooth和DENTALIKE）的牙齿复制品制造的牙齿复制品在评估人员中的接受度更高，尽管学生对TrueTooth牙齿复制品的评价和表现较差，原因是难度较高。最好的选择是TrueTooth（70％的响应），因为其解剖结构复杂且对器械和热插拔器的抵抗力较差。评估人员检测到特定牙齿复制品和基于自然牙齿的microCT扫描制造的优选牙齿复制品中的几个常见错误。结论基于microCT天然牙齿（TrueTooth和DENTALIKE）的牙齿复制品制造的牙齿复制品在评估人员中的接受度更高，尽管学生对TrueTooth牙齿复制品的评价和表现较差，原因是难度较高。最好的选择是TrueTooth（70％的响应），因为其解剖结构复杂且对器械和热插拔器的抵抗力较差。评估人员检测到特定牙齿复制品和基于自然牙齿的microCT扫描制造的优选牙齿复制品中的几个常见错误。结论基于microCT天然牙齿（TrueTooth和DENTALIKE）的牙齿复制品制造的牙齿复制品在评估人员中的接受度更高，尽管学生对TrueTooth牙齿复制品的评价和表现较差，原因是难度较高。