Division of Molecular and Regenerative Prosthodontics, Tohoku University Graduate School of Dentistry, Sendai, Japan; Liaison Center for Innovative Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan; Division of Fixed Prosthodontics, Meikai University School of Dentistry, Sakado, Japan.
Division of Molecular and Regenerative Prosthodontics, Tohoku University Graduate School of Dentistry, Sendai, Japan.
J Prosthodont Res. 2019 Jan;63(1):78-84. doi: 10.1016/j.jpor.2018.08.005. Epub 2018 Dec 21.
To evaluate the early performance of computer-aided design/computer-aided manufacturing (CAD/CAM)-produced composite resin crown (CAD/CAM composite crown) treatment on premolars, specifically, placement on a removable partial denture (RPD) abutment tooth, and the distalmost tooth in the dental arch, as possible clinical risk factors.
A retrospective cohort study (April 2014 to July 2017) was performed utilizing the clinical records of patients who received a premolar CAD/CAM composite crown treatment. The variables of time of treatment for (1) successful crowns (complication event-free) and (2) surviving crowns (clinically functional including re-luted) were estimated using Kaplan-Meier analysis. Survival distributions regarding "RPD abutment tooth" and "distalmost tooth" were analyzed with the log-rank test. Multilevel survival analyses were used to identify hazard ratios and associated risk factors.
Five hundred and forty-seven crowns were evaluated (mean follow-up time 1.3±0.9years) in 327 patients. A total of 87 crowns had at least one complication, with loss of crown retention being the most common (70 crowns). Estimated success and survival rates at 3 years were 71.7% and 96.4%, respectively. The risk of complications was significantly higher for an RPD abutment tooth than for a non-RPD abutment tooth. There was no significant difference between the distalmost tooth and non-distalmost tooth in the dental arch.
The demonstrated complication rate for CAD/CAM composite crowns placed on premolars was 15.9% over a period of up to 3 years. There was a substantial risk of complications with placement of such a crown on an RPD abutment tooth.
评估计算机辅助设计/计算机辅助制造（CAD/CAM）制作的复合树脂冠（CAD/CAM 复合冠）在前磨牙上的早期性能，特别是在可摘局部义齿（RPD）基牙和牙弓最远端的牙齿上的应用，作为可能的临床危险因素。
采用回顾性队列研究（2014 年 4 月至 2017 年 7 月），利用接受前磨牙 CAD/CAM 复合冠治疗的患者的临床记录。使用 Kaplan-Meier 分析估计（1）成功冠（无并发症）和（2）存活冠（包括重新黏结的临床功能）的治疗时间的变量。使用对数秩检验分析关于“RPD 基牙”和“最远端牙齿”的生存分布。使用多水平生存分析来确定危险比和相关危险因素。
在 327 名患者中，共评估了 547 个冠（平均随访时间为 1.3±0.9 年）。共有 87 个冠至少有一个并发症，其中最常见的是冠固位丧失（70 个冠）。3 年时的估计成功率和生存率分别为 71.7%和 96.4%。RPD 基牙的并发症风险明显高于非 RPD 基牙。牙弓中最远端的牙齿和非最远端的牙齿之间没有显著差异。
在前磨牙上放置 CAD/CAM 复合冠的 3 年内，并发症发生率为 15.9%。在 RPD 基牙上放置此类冠存在很大的并发症风险。
