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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/2155

Title: Biologic response of immediately versus delayed loaded implants supporting ill-fitting prostheses: An animal study
Authors: Vrielinck, L.
Abe, Y.
Schepers, S.
Naert, I.
LAMBRICHTS, Ivo
POLITIS, Constantinus
Issue Date: 2005
Publisher: BLACKWELL PUBLISHING
Citation: CLINICAL IMPLANT DENTISTRY AND RELATED RESEARCH, 7(3). p. 150-158
Abstract: Background: Computer-assisted preoperative implant planning and transfer toward the patient allow the production of a prosthesis prior to surgery. This implies that the prosthesis can be installed immediately following implant insertion. Am inherent disadvantage of this is a cumulated error, which can lead to prosthesis misfit owing to topographic deviations of the planned versus the installed implants. Purpose: The aim of this study was to determine whether prosthesis misfit is compromising the osseointegration of immediately versus delayed loaded implants and whether freshly installed implants adapt to the prosthesis. Materials and Methods: In each of five New Zealand White rabbits, two experimental conditions were compared. One tibia harbored the so-called test implant, which originally showed a vertical misfit of about 500 mu m with the prosthesis to which it was tightened immediately after implant installation. The control implant was installed in the other tibia and was allowed to heal during 9 weeks before the prosthesis with the vertical misfit of about 500 Vim was connected to it. The prostheses were left in place for 12 weeks, after which the animals were sacrificed. Results: All implants healed uneventfully. There were no statistically significant differences between the biologic responses of test and control implants. With a three-dimensional laser scanner, significantly more displacement of the test implants toward the prostheses was observed compared with the control implants. This led to a significant decrease in prosthesis misfit for the test implants compared with the control implants. Conclusions: This study indicates that prosthesis misfit does not per se lead to biologic failure of immediately loaded or of already osseointegrated implants. In addition, immediately loaded implants seem to topographically adapt to the prosthesis, thereby minimizing the existing misfit.
Notes: Katholieke Univ Leuven, BIOMAT Res Grp, Dept Prosthet Dent, UZ St Raphael, B-3000 Louvain, Belgium. Ziekenhuis Oost Limburg, Dept Oral & Maxillofacial Surg, Genk, Belgium. Limburgs Univ Ctr, Dept Basic Med Sci, Diepenbeek, Belgium. Hiroshima Univ, Grad Sch Biomed Sci, Div Cervicognathostomatol, Dept Adv Prosthodont, Hiroshima, Japan.Duyck, J, Katholieke Univ Leuven, BIOMAT Res Grp, Dept Prosthet Dent, UZ St Raphael, Kapucijnenvoer 7, B-3000 Louvain, Belgium.Joke.Duyck@uz.kuleuven.ac.be
URI: http://hdl.handle.net/1942/2155
DOI: 10.1111/j.1708-8208.2005.tb00059.x
ISI #: 000237226200005
ISSN: 1523-0899
Category: A1
Type: Journal Contribution
Validation: ecoom, 2007
Appears in Collections: Research publications

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