目的:种植体周围的骨吸收会影响种植体基台复合体(IAC)的阻力。本体外研究旨在评估表现出不同程度的骨损失和直径的植入物对静态疲劳的稳定性。
方法:90个内部圆锥形连接的植入物,具有3种不同的植入物直径(3.3mm(I33),3.8mm(I38),和4.3毫米(I43))和3个模拟骨丢失设置(1.5毫米(I_15),3.0mm(I_30),和4.5毫米(I_45)(n=10))嵌入和标准桥台安装。所有标本均人工老化(1,200,000个周期,50N,同时进行热循环),并随后进行了断裂载荷测试。为了进行统计分析,科尔莫戈罗夫-斯米尔诺夫试验,Kruskal-Wallis测试,采用Mann-WhitneyU检验(p<0.05)。
结果:所有试样都经受了人工老化而没有损坏。平均失效值为382.1(±59.2)N(I3315),347.0(±35.7)N(I3330),315.9N(±30.9)(I3345),531.4(±36.2)N(I3815),514.5(±40.8)N(I3830),477.9(±26.3)N(I3845),710.1(±38.2)N(I4315),697.9(±65.2)N(I4330),和662.2N(±45.9)(I4345)。当骨丢失倾向时,所有组的IAC的稳定性均降低。仅仅,I43亚组的失效载荷值无显著差异.
结论:较大的植入物直径和植入物周围较小的圆形骨丢失导致IAC的稳定性更高。植入物直径越小,稳定性受圆周骨水平的影响越大。
结论:保留牙髓骨水平对于确保具有锥形界面的植入物系统的生物力学可持续性很重要。在植入物计划过程和恢复性考虑过程中,考虑植入物周围最终骨质流失的影响似乎是明智的。
OBJECTIVE: Bone resorption around implants could influence the resistance of the implant abutment complex (IAC). The present in vitro study aimed to assess the stability to static fatigue of implants presenting different levels of bone losses and diameters.
METHODS: Ninety implants with an internal conical connection with 3 different implant diameters (3.3 mm (I33), 3.8 mm (I38), and 4.3 mm (I43)) and 3 simulated bone loss settings (1.5 mm (I_15), 3.0 mm (I_30), and 4.5 mm (I_45) (n = 10)) were embedded and standard abutments were mounted. All specimens were artificially aged (1,200,000 cycles, 50 N, simultaneous thermocycling) and underwent subsequently load-to-fracture test. For statistical analysis, Kolmogorov-Smirnov test, Kruskal-Wallis test, and Mann-Whitney U test (p < 0.05) were applied.
RESULTS: All test specimens withstood the artificial aging without damage. The mean failure values were 382.1 (± 59.2) N (I3315), 347.0 (± 35.7) N (I3330), 315.9 N (± 30.9) (I3345), 531.4 (± 36.2) N (I3815), 514.5 (± 40.8) N (I3830), 477.9 (± 26.3) N (I3845), 710.1 (± 38.2) N (I4315), 697.9 (± 65.2) N (I4330), and 662.2 N (± 45.9) (I4345). The stability of the IACs decreased in all groups when bone loss inclined. Merely, the failure load values did not significantly differ among subgroups of I43.
CONCLUSIONS: Larger implant diameters and minor circular bone loss around the implant lead to a higher stability of the IAC. The smaller the implant diameter was, the more the stability was affected by the circumferential bone level.
CONCLUSIONS: Preserving crestal bone level is important to ensure biomechanical sustainability at implant systems with a conical interface. It seems sensible to take the effect of eventual bone loss around implants into account during implant planning processes and restorative considerations.