Romeed S A, Fok S L, Wilson N H F
Department Oral Surgery, St John's, Chelmsford, Essex, UK.
J Oral Rehabil. 2004 Dec;31(12):1208-17. doi: 10.1111/j.1365-2842.2004.01354.x.
The purpose of this study was to investigate, by means of the finite element method the mechanical behaviour of three designs of fixed partial denture (FPD) for the replacement of the maxillary first premolar in shortened dental arch therapy. Two-dimensional, linear, static finite element analyses were carried out to investigate the biomechanics of the FPDs and their supporting structures under different scenarios of occlusal loading. Displacement and stress distribution for each design of FPD were examined, with particular attention being paid to the stress variations along the retainer-abutment--and the periodontal ligament-bone interfaces. The results indicated that displacement and maximum principal stresses in the fixed-fixed, three-unit FPD were substantially less than those in the two-unit cantilever FPDs. Of the two cantilever FPDs investigated, the distal cantilever design was found to suffer less displacement and stresses than the mesial cantilever design under similar conditions of loading. The highest values for maximum principal stress in the cantilever FPDs were found within the connector between the pontic and the retainer, and within the periodontal ligament and adjacent bone on the aspect of the retainer away from the pontic.
本研究的目的是通过有限元方法研究三种固定局部义齿（FPD）设计在短牙弓治疗中替代上颌第一前磨牙时的力学行为。进行二维线性静态有限元分析，以研究不同咬合加载情况下FPD及其支持结构的生物力学。检查了每种FPD设计的位移和应力分布，特别关注沿固位体 - 基牙以及牙周膜 - 骨界面的应力变化。结果表明，双端固定的三单位FPD中的位移和最大主应力明显小于双单位悬臂式FPD中的位移和最大主应力。在所研究的两种悬臂式FPD中，发现在相似的加载条件下，远端悬臂设计比近中悬臂设计的位移和应力更小。悬臂式FPD中最大主应力的最高值出现在桥体与固位体之间的连接体处，以及固位体远离桥体一侧的牙周膜和相邻骨内。
