Chou T M, Caputo A A, Moore D J, Xiao B
Department of Removable Prosthodontics, University of Missouri, School of Dentistry, Kansas City.
J Prosthet Dent. 1989 Sep;62(3):313-9. doi: 10.1016/0022-3913(89)90339-9.
This investigation photoelastically compared the load-transfer characteristics of various bilateral distal-extension removable partial denture designs embodying intracoronal attachments and clasp assemblies. Six distal-extension designs that included the RPI clasp assembly, cast circumferential clasp, P.D. locking semiprecision, Thompson dowel nonlocking semiprecision, and McCollum and Stern G/L precision attachments were tested. Each prosthesis was subjected to various simulated occlusal loads. Evaluation of the load-transfer characteristics of the various designs was based on comparison of the recorded isochromatic fringe distributions. The RPI clasp assembly generated the most uniform stresses. In general, the four intracoronal retainer frameworks produced higher stresses than did the two clasp frameworks. The highest stresses were developed by the Stern G/L precision attachment.
本研究通过光弹性法比较了各种采用冠内附着体和卡环组件的双侧远中游离可摘局部义齿设计的负荷传递特性。测试了六种远中游离设计，包括RPI卡环组件、铸造环形卡环、P.D.锁定半精密附着体、汤普森定位销非锁定半精密附着体以及麦科勒姆和斯特恩G/L精密附着体。每个修复体都承受了各种模拟咬合负荷。基于记录的等色条纹分布的比较，对各种设计的负荷传递特性进行了评估。RPI卡环组件产生的应力最为均匀。一般来说，四种冠内固位体框架产生的应力高于两种卡环框架。斯特恩G/L精密附着体产生的应力最高。
