Halil İbrahim Akkoç, Cangül Keskin, Kubilay Aslantaş
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引用次数: 0
摘要
本研究利用有限元分析(FEA)评估了实验设计的具有不同截面几何形状和间距长度的镍钛旋转锉的应力分布、最大应力值和疲劳寿命。在弯曲度为 30°、45° 和 60°的模拟根管中测试了四种截面形状(凸三角形、S 形、三螺旋形和凹三角形)和两种间距长度(2 毫米和 3 毫米)。有限元分析结果表明,与 S 形和凹三角形设计相比,凸三角形和三螺旋形设计的应力值较低。增加牙道曲率角会导致更高的应力值,其中 S 形器械的应力值增幅最大(高达 12%)。间距较短的仪器显示出更均匀的应力分布,从而延长了疲劳寿命。最大应力集中在距顶端 5-8 毫米处,各切削刃的应力不尽相同,S 形切面的应力最小,但由于惯性矩较小,应力较大。
Dynamic analysis of a NiTi rotary file by using finite element analysis: Effect of cross-section and pitch length.
This study assessed stress distribution, maximum stress values and fatigue life of experimentally designed NiTi rotary files with different cross-sectional geometry and pitch length using finite element analysis (FEA). Four cross-sectional shapes (Convex triangle, S-shaped, Triple helix and Concave triangle) and two pitch lengths (2 mm and 3 mm) were tested in simulated root canals with curvatures of 30°, 45° and 60°. The FEA results indicated that convex triangle and triple helix geometries exhibited lower stress values compared to the S-shaped and concave triangle designs. Increasing the canal curvature angle resulted in higher stress values, with the S-shaped instrument showing the most significant increase (up to 12%). Instruments with shorter pitch lengths showed more even stress distribution enhancing fatigue life. The maximum stress was concentrated 5-8 mm from the tip, varying across cutting edges, with S-shaped sections experiencing the lowest forces but higher stress due to lower moments of inertia.
期刊介绍:
The Australian Endodontic Journal provides a forum for communication in the different fields that encompass endodontics for all specialists and dentists with an interest in the morphology, physiology, and pathology of the human tooth, in particular the dental pulp, root and peri-radicular tissues.
The Journal features regular clinical updates, research reports and case reports from authors worldwide, and also publishes meeting abstracts, society news and historical endodontic glimpses.
The Australian Endodontic Journal is a publication for dentists in general and specialist practice devoted solely to endodontics. It aims to promote communication in the different fields that encompass endodontics for those dentists who have a special interest in endodontics.