State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.
J Zhejiang Univ Sci B. 2013 Jun;14(6):526-32. doi: 10.1631/jzus.B1200264.
This study investigated the effect of proximal contact strength on the three-dimensional displacements of cantilever fixed partial denture (CFPD) under vertically concentrated loading with digital laser speckle (DLS) technique.
Fresh mandible of beagle dog was used to establish the implant-supported CFPD for specimen. DLS technique was employed for measuring the three-dimensional displacement of the prosthesis under vertically concentrated loading ranging from 200 to 3000 g. The effect of the contact tightness on the displacement of CFPD was investigated by means of changing the contact tightness.
When an axial concentrated loading was exerted on the pontic of the implant-supported CFPD, the displacement of the CFPD was the greatest. The displacement of the prosthesis decreased with the increase of contact strength. When the contact strength was 0, 0.95, and 3.25 N, the displacement of the buccolingual direction was smaller than that of the mesiodistal direction but greater than that of the occlusogingival direction. When the force on the contact area was 6.50 N, the mesiodistal displacement of the prosthesis was the biggest while the buccolingual displacement was the smallest.
The implant-supported CFPD is an effective therapy for fully or partially edentulous patients. The restoration of the contact area and the selection of the appropriate contact strength can reduce the displacement of the CFPD, and get a better stress distribution. The most appropriate force value is 3.25 N in this study.
本研究采用数字激光散斑（DLS）技术研究了在垂直集中载荷下，邻面接触强度对悬臂固定局部义齿（CFPD）三维位移的影响。
采用新鲜比格犬下颌骨建立种植体支持的 CFPD 标本。采用 DLS 技术测量从 200 到 3000 g 范围内的集中垂直载荷下修复体的三维位移。通过改变接触紧密度来研究接触紧密度对 CFPD 位移的影响。
当对种植体支持的 CFPD 的桥体施加轴向集中载荷时，CFPD 的位移最大。随着接触强度的增加，修复体的位移减小。当接触强度为 0、0.95 和 3.25 N 时，颊舌向的位移小于近远中向的位移，但大于牙合龈向的位移。当接触面积上的力为 6.50 N 时，修复体的近远中向位移最大，颊舌向位移最小。
种植体支持的 CFPD 是一种有效的全口或半口缺牙患者的治疗方法。恢复接触面积和选择适当的接触强度可以减少 CFPD 的位移，并获得更好的应力分布。在本研究中，最合适的力值为 3.25 N。
