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Abstract：
Background It is difficult to determine the optimal method for restoring endodontically treated teeth, as several factors affect this decision. Functional requirements and the amount of remaining coronal tissue are considered the most important factors in choosing the best restoration for those teeth. Endocrown was introduced as a conservative alternative for endodontically treated and coronally damaged teeth. Aim The aim of this study is to assess the clinical performance of the nanoceramic system for molar endocrowns by evaluating color change, gingival condition, prosthesis integrity, and the presence of secondary caries. Materials and methods The sample consisted of 20 endocrowns. The teeth were prepared with at least 2 mm of wall thickness and a cavity depth of 4 mm from the occlusal surface. The final impression was taken, and the prostheses were adhered using dual-cure resin cement. It was clinically evaluated according to clinical success criteria (United States Public Health Service) in terms of color stability, gingival indexes, integrity of the restoration, and the presence of secondary caries after a week, three months, six months, and a year. The statistical study was conducted using IBM SPSS Statistics for Windows, Version 23.0 (Released 2015; IBM Corp., Armonk, NY, USA), and the results were considered statistically significant at the 95% level of significance. The Friedman test was used to study the significance of the differences in the average values of color change, plaque index, and the integrity of the prostheses during follow-up periods. Results The study showed a gradual increase in the degree of color change with follow-up periods. Furthermore, there was no significant difference in the incidence of gingival changes, the integrity of the prosthetic margins, or the occurrence of secondary caries during the follow-up periods. Conclusions Within the limitations of this study, an endocrown made of CeraSmart nanoceramic is an acceptable option for crowning decayed and endodontic-treated molars with acceptable clinical performance.
摘要：
背景技术很难确定修复经牙髓治疗的牙齿的最佳方法,因为有几个因素会影响这个决定。功能要求和剩余冠状组织的数量被认为是为这些牙齿选择最佳修复的最重要因素。Endocrown被引入作为牙髓治疗和冠状损伤牙齿的保守替代方案。目的本研究的目的是通过评估颜色变化来评估纳米陶瓷材料对磨牙内冠体的临床性能。牙龈状况，假体完整性,和继发性龋齿的存在。材料和方法样品由20个内冠体组成。牙齿被制备成具有至少2mm的壁厚和距咬合面4mm的腔深度。最后的印象是，并使用双重固化树脂水泥粘附假体。根据临床成功标准（美国公共卫生服务）在颜色稳定性方面进行临床评估，牙龈指数，修复的完整性，一周后出现继发性龋齿，三个月,六个月,和一年。统计研究是使用IBMSPSSStatisticsforWindows进行的，版本23.0（2015年发布；IBMCorp.,Armonk,NY,美国),结果在95%的显著性水平被认为具有统计学意义.Friedman检验用于研究颜色变化平均值差异的显著性,菌斑指数,以及随访期间假体的完整性。结果研究显示随着随访时间的延长,颜色变化程度逐渐增加。此外，牙龈变化的发生率没有显着差异，假肢边缘的完整性，或在随访期间发生继发性龋齿。结论在本研究的局限性内，由CeraSmart纳米陶瓷制成的内长球是一种可接受的选择，可用于冠状腐烂和牙髓治疗的磨牙，具有可接受的临床表现。
