Department of Prosthetic Dentistry, University Hospital, LMU Munich, Goethestrasse 70, 80336, Munich, Germany.
Department of Conservative Dentistry and Periodontology, University Hospital, LMU Munich, Goethestrasse 70, 80336, Munich, Germany.
Clin Oral Investig. 2021 Oct;25(10):5987-5996. doi: 10.1007/s00784-021-03905-9. Epub 2021 Apr 3.
To investigate the impact of different cleaning methods on the fracture load and two-body wear of additively manufactured three-unit fixed dental prostheses (FDP) for long-term temporary use, compared to the respective outcomes of milled provisional PMMA FDPs.
Shape congruent three-unit FDPs were 3D printed using three different resin-based materials [FPT, GCT, NMF] or milled [TEL] (N = 48, n = 16 per group). After printing, the FDPs were cleaned using: Isopropanol (ISO), Yellow Magic 7 (YEL), or centrifugal force (CEN). Chewing simulation was carried out with a vertical load of 50 N (480,000 × 5 °C/55 °C). Two-body wear and fracture load were measured. Data were analyzed using global univariate ANOVA with partial eta squared, Kruskal-Wallis H, Mann-Whitney U, and Spearman's rho test (p < 0.05).
TEL showed less wear resistance than FPT (p = 0.001) for all cleaning methods tested. Concerning vertical material loss, NMF and GCT were in the same range of value (p = 0.419-0.997), except within FDPs cleaned in ISO (p = 0.021). FPT showed no impact of cleaning method on wear resistance (p = 0.219-0.692). TEL (p < 0.001) showed the highest and FPT (p < 0.001) the lowest fracture load. Regarding the cleaning methods, specimens treated with ISO showed lower fracture load than specimens cleaned with CEN (p = 0.044) or YEL (p = 0.036).
The material selection and the cleaning method can have an impact on two-body wear and fracture load results.
Printed restorations showed superior two-body wear resistance compared to milled FDPs but lower fracture load values. Regarding cleaning methods, ISO showed a negative effect on fracture load compared to the other methods tested.
研究不同清洁方法对长期临时使用的增材制造三单位固定义齿（FDP）的断裂载荷和三体磨损的影响，与铣削临时聚甲基丙烯酸甲酯 FDP 的相应结果相比。
使用三种不同的基于树脂的材料[FPT、GCT、NMF]或铣削[TEL]（N = 48，每组 16 个）3D 打印形状一致的三单位 FDP。打印后，使用异丙醇（ISO）、Yellow Magic 7（YEL）或离心力（CEN）对 FDP 进行清洁。使用 50 N 的垂直载荷（480,000×5°C/55°C）进行咀嚼模拟。测量三体磨损和断裂载荷。使用全局单变量 ANOVA 分析具有偏 eta 平方、Kruskal-Wallis H、Mann-Whitney U 和 Spearman's rho 检验（p < 0.05）。
与所有测试的清洁方法相比，TEL 的耐磨性均低于 FPT（p = 0.001）。关于垂直材料损失，NMF 和 GCT 的值在同一范围内（p = 0.419-0.997），除了在 ISO 清洁的 FDP 中（p = 0.021）。FPT 的清洁方法对耐磨性无影响（p = 0.219-0.692）。TEL（p < 0.001）显示出最高的断裂载荷，而 FPT（p < 0.001）显示出最低的断裂载荷。关于清洁方法，用 ISO 处理的标本的断裂载荷低于用 CEN（p = 0.044）或 YEL（p = 0.036）清洁的标本。
材料选择和清洁方法会对三体磨损和断裂载荷结果产生影响。
打印修复体与铣削 FDP 相比具有更高的三体耐磨性，但断裂载荷值较低。关于清洁方法，与其他测试方法相比，ISO 对断裂载荷有负面影响。
