AIM To assess the suitability of several 3D-printed resins for the manufacturing of tooth replicas for endodontic training in comparison with commercially available replicas by analysing the properties of the materials and comparing them with real teeth during endodontic training. METHODOLOGY Tooth replicas were 3D printed using four resins (NextDent Model, NextDent C&B, V-Print ee, Vero White Plus) and compared with two commercially available products (VDW, Smile Factory) as well as extracted human teeth. Martens hardness, intendation modulus and radiopacity were investigated on these tooth replicas. Experienced dentists evaluated the suitability of the replicas for endodontic training by comparing them with real teeth in terms of appearance, anatomy, radiopacity, similarity to dentine during access opening, canal gauging and canal instrumentation. Data were analyzed using the Kolmogorov-Smirnov and Mann-Whitney-U-test. RESULTS The highest hardness values were recorded for human dentine (p<0.001), followed by V-Print ee and the commercial tooth replica of Smile Factory. The greatest radiopacity was associated with VOC and dentine (p<0.001) in comparison to the other materials tested. The appearance of the in-house printed tooth replicas was subjectively evaluated by the dentists as being more realistic than the commercially available products. No differences between the replicas could be detected regarding mechanical instrumentation of the root canals. CONCLUSION None of the tooth replicas were able to simulate human dentine from the perspectives evaluated. V-Print ee had radiopacity comparable with dentine, but its hardness was not comparable with dentine.

中文翻译：

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对用于牙髓训练的内部印刷和商业牙齿复制品的材料特性和临床适用性的关键评估。

目的通过分析材料的特性并将其与牙髓训练过程中的真实牙齿进行比较，以评估几种3D打印树脂与牙髓训练产品相比，是否适合制造用于牙髓训练的牙齿复制品。方法学使用四种树脂（NextDent模型，NextDent C＆B，V-Print ee，Vero White Plus）对牙齿复制品进行3D打印，并与两种市售产品（VDW，Smile Factory）以及提取的人类牙齿进行比较。研究了这些牙齿复制品的马氏硬度，预期模量和不透射线性。经验丰富的牙医通过将假牙与真实牙齿的外观，解剖结构，射线不透性，进入通道期间与牙本质的相似性进行比较，从而评估了这些假牙是否适合进行牙髓病训练，运河测量和运河仪器。使用Kolmogorov-Smirnov和Mann-Whitney-U检验分析数据。结果记录了人类牙本质的最高硬度值（p <0.001），其次是V-Print ee和Smile Factory的商业牙齿复制品。与其他测试材料相比，最大的不透射线性与VOC和牙本质有关（p <0.001）。牙医主观评估了内部印刷牙齿仿制品的外观，比市售产品更真实。关于根管的机械器械，在复制品之间没有发现差异。结论从所评估的角度来看，没有一个牙齿复制品能够模拟人类牙本质。V-Print ee的射线不透性可与牙本质相媲美，