DS, Department of Prosthetic Dentistry, UKR University Hospital Regensburg, 93042 Regensburg, Germany.
DDS, Department of Prosthetic Dentistry, UKR University Hospital Regensburg, 93042 Regensburg, Germany.
J Mech Behav Biomed Mater. 2021 Dec;124:104885. doi: 10.1016/j.jmbbm.2021.104885. Epub 2021 Oct 7.
Printed splints may be an alternative treatment for functional disorders. In addition to the selection of materials, the influence of cleaning or polymerisation can affect the dynamic behaviour and fatigue limit of printed materials.
96 discs (n = 6 per group, 16mmx2mm) were printed (P30+ DLP-printer, Straumann, CH; 100 μm layer) from splint materials (M1: Luxaprint OrthoPlus, DMG, G; M2: V-Print Splint, Voco, G). Specimens were either automatically cleaned (C1: Straumann P Wash, Straumann, CH) or manually cleaned (C2: Voco Pre-/Main-Clean protocol, Voco, G). Post polymerisation was performed with LED (P1: Cure, Straumann, CH) or Xenon light (P2: Otoflash N171, Ernst Hinrichs Dental, G). The flexural fatigue limit was determined under cyclic loading in terms of a staircase approach with a piston-on-3-ball-test according to ISO 6872 after 24 h or 60 days water storage (37 °C). Specimens were preloaded with 50N and dynamic force was applied for 10 loadings per step (f = 3Hz; steps 1: 50N-100N, 2: 50N-150N, 3: 50N-200N, 4: 50N-250N; F1000, Prematec, G; water at 37 °C).
Kaplan Maier Log Rank (Mantel-Cox) test, ANOVA, Pearson correlations, Levene-test (α = 0.05, SPSS 26.0, IBM, Armonk, NY, USA)).
Mean survival cycles after 24 h of storage varied between 40388 (M1C2P2) and 195140 (M2C2P1) cycles and after 60 d decreased to 14022 (M1C2P2) and 173237 (M2C1P1). Kaplan Maier Log Rank test revealed significant differences between the material combinations. For M1 cleaning (Pearson: 0.346, p = 0.016) and for M2 polymerisation (Pearson: 0.616, p = 0.000) significantly influenced the number of loading cycles. Intermediate effects were found for material (p = 0.026), cleaning (p = 0.024) and polymerisation (p = 0.000) as well as the combination of material and polymerisation (p = 0.008).
The results show that the number of possible loading cycles of additively manufactured splint specimens depends on the type of material, their cleaning and post-polymerisation.
Materials, cleaning and post-polymerisation of additive manufacturing processes should be matched to improve dynamic loading performance of splint materials.
打印夹板可能是治疗功能障碍的一种替代方法。除了材料的选择外，清洗或聚合的影响也会影响打印材料的动态性能和疲劳极限。
96 个圆盘（每组 6 个，16mmx2mm）由夹板材料（M1：Luxaprint OrthoPlus，DMG，德国；M2：V-Print Splint，Voco，德国）通过 P30+DLP 打印机（Straumann，瑞士）打印而成（100μm 层厚）。标本要么自动清洗（C1：Straumann P Wash，Straumann，瑞士），要么手动清洗（C2：Voco Pre-/Main-Clean 方案，Voco，德国）。后聚合使用 LED（P1：Cure，Straumann，瑞士）或氙气灯（P2：Otoflash N171，Ernst Hinrichs Dental，德国）进行。根据 ISO 6872，在 24 小时或 60 天水储存（37°C）后，在活塞对 3 球测试的阶梯方法下，通过循环加载确定弯曲疲劳极限。标本预加载 50N，动态力以 3Hz 的频率施加 10 次加载/步（f）（步骤 1：50N-100N，2：50N-150N，3：50N-200N，4：50N-250N；F1000，Prematec，德国；37°C 下的水）。
卡普兰迈耶对数秩（曼恩-科克）检验、方差分析、皮尔逊相关性、莱文检验（α=0.05，SPSS 26.0，IBM，Armonk，NY，美国））。
存储 24 小时后的平均存活周期在 M1C2P2（40388）和 M2C2P1（195140）之间变化，60 天后降至 M1C2P2（14022）和 M2C1P1（173237）。卡普兰迈耶对数秩检验显示材料组合之间存在显著差异。对于 M1 清洗（皮尔逊：0.346，p=0.016）和 M2 聚合（皮尔逊：0.616，p=0.000）对加载循环次数有显著影响。还发现材料（p=0.026）、清洗（p=0.024）和聚合（p=0.000）以及材料和聚合（p=0.008）之间存在中间效应。
结果表明，增材制造夹板标本的可能加载循环次数取决于材料的类型、它们的清洗和后聚合。
应匹配增材制造工艺的材料、清洗和后聚合，以提高夹板材料的动态承载性能。
