多个单元支柱角度对假肢螺杆关节稳定性的影响
Mevadee Pibulniyom1, Marwan Fattouhi1, Sieu Yien Chiam2
1Department of Restorative Dentistry, Graduate Prosthodontics, School of Dentistry, University of Washington, Seattle, Washington, USA.
概括
这项研究发现,多单元支柱 (MUAs) 的更高的角度度导致了更大的假肢螺丝松动. 虽然拉出力类似,但30° MUA显示螺丝变形,与控制不同. 这突出了牙科假肢中角形支柱所带来的风险.
科学领域:
- 牙科植入物学 牙科植入物学
- 生物材料科学 生物材料科学
- 牙修复 牙修复 牙修复 牙修复 牙修复
背景情况:
- 多个单元支架 (MUAs) 对于固定牙假肢的角度植入物放置至关重要.
- 假肢螺杆关节的稳定性对于长期的植入成功至关重要.
- 了解MUA角对螺丝稳定性的影响对于临床实践至关重要.
研究的目的:
- 为了评估多单元支柱 (MUA) 角度对假肢螺杆关节稳定性的影响.
- 为了比较在模拟的力下螺丝松动和应对保留.
- 分析与不同MUA角度相关的故障模式.
主要方法:
- 准备了30个植入式假体标本,具有不同的MUA角 (0°,17°,30°).
- 反向扭矩测试和拉出测试是在热循环和循环负荷后进行的.
- 失效模式和螺丝损坏被微观地检查.
主要成果:
- 扭矩值的损失在16.43%至28.78%之间,在30° MUA组在加载前的损失显著更高.
- 循环负荷增加了对照组的扭矩损失.
- 在拉出力方面没有发现显著差异,但30° MUAs显示100%的螺丝变形,而控制体验了应对解锁.
结论:
- 虽然总体保留并没有受到MUA角的显著影响,但更高的度 (30°) 增加了假肢螺丝松动和变形.
- 故障模式不同,螺丝变形在更高的角度占主导地位.
- 需要对MUA角进行临床考虑,以减轻螺丝松动和机械并发症的风险.
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