Analysis of the effect of contact strength on three-dimensional displacement of an implant-supported fixed bridge under axial-concentrated load using digital laser speckle photography
Wang, J.; Peng, Z.; Li, A.; Xu, Z.; Chen, X.
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi 30(6): 1235-1238; 1243
2013
ISSN/ISBN: 1001-5515 PMID: 24645603 Document Number: 667875
The purpose of this study was to investigate the effect of four kinds of different contact strength on the three-dimensional displacement of an implant-supported fixed bridge using digital laser speckle photography method. An in vitro model of beagle mandible with an implant-supported fixed bridge in its right premolar region was developed. The bridge was Au-Pt metal-ceramic. The contact was recovered to four different tightnesses, named 0, 1, 2, and 3. Different axial concentrated static load was applied to abutments and bridge respectively. The three-dimensional displacement of the implant-supported fixed bridge was measured using digital laser speckle photographic method. The results demonstrated that the influence of contact tightness was mainly on the mesio-distal and buccal lingual parts. When the contact tightness reached number 3, the regularity of displacement distribution was changed. The present study proved that digital laser speckle photography was an effective method of measuring the micro-displacement. One of the criterions of contact recovering decreased the implant displacement effectively without changing the regularity of displacement distribution.