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KMID : 0354619920040010181
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Journal Dankook Dental Research Institute
1992 Volume.4 No. 1 p.181 ~ p.198
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A Study on the Finite Element Analysis of Stresses Induced by the connection Modalites between Natural Abutment
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Abstract
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Dental prosthodontics, of which primary objective is the rehabilitation of mastication, esthetice and phonetics etc. caused by the loss of teeth and their supporting structures, has a new vista in which the studies of making fixed or removable
prosthesis by implanting artificial roots into jaw one are actively under progress.
In the early phase, osseo-integrated implants were mostly used for the treatment of fully edentulous patients byt recently various methods of rehabilitation partial edentlous jaws has been studied and are actually applied to the clinical use.
Clinicians have much interest in the connection modalities of the natural abutments and implants, and the fact which type of connection brings about the most favorable results is a very important question.
As a part of biomechanical study of biofunction, stress analysis using finite elements were applied to compare and analyse stress produced in adjacent and tissue to the natural abutments and dental implants.
Expcrimental models have dental implants in partial edentulous areas in the lower arch, where 1st and 2nd molars were unilaterally lost. 4 finite models(free standing, rigid, semi-rigid, and telescopic connector) were designed. Load of 1.5Kg and
30Kg
were applied to each experimental group respectively.
After the models were checked and results were calculated by the transformation procedures following results were obtained. The stress occuring along the interface of cortical bone and supporting structures of the abutments, and along the
cancellous
bone, were compared according to the model types.
1. In the free standing implant prosthesis, which is not connected to the natural abutment tooth, high stress distributions were observed in the distal third area of natural abutment apex, mesiocervical area of 1st implant and in disto-cervical
area of
2nd implant in all of experimental groups.
2. In the cases of rigid and telescopic models of 3 unit bridge, using one natural abutment and one implant fixture, stress distribution and amount were similar in both group 1(1.5kg) and group 2(30kg). High stress distributions were observed in
the
mesio-apical third of natural abutment and cervical region of implant fixture.
3. In the semi-rigid model, high stress distributions were observe din the cervical region of natural abutment and cervical third of implant fixture in group 1Stresses were more concentrated in implant fixtures. In group, 2 high stress
distributions
were observed in the apical third of natural tooth and in the mesio-apical third and disto-middle third of implant fixtures. The stress was concentrated more from mesio-apical third to the disto-middle third in the implant fixture than natural
abutment
tooth.
4. In the cancellous bone under the interface of cortical bone, natural abutment and implant fixture, stresses were concentrated on underlyingapex of natural abutment tooth in free standing model. Stree distribution was high in disto-middle
third
of
natural abutment in rigid and telescopic model, and it was relatively high in each underlying apex of natural abutment. In group 1 of semi-rigid model, high stress distributions were observe din the disto-middle third of abutment tooth and in the
mesial
surface of implant fixtures. Strsess distributions were high in the disto-middle third natural abutment and mesial and apical region of implant fixtures in group 2.
5. under the limits of elasticity, the pattern of stress distribution was almost unaffected by the differences in the load applied, but resultant stress amounts were affected by the magnitude in the forces applied.
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KEYWORD
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