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KMID : 0879420000020010015
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Journal of the Implant Research
2000 Volume.2 No. 1 p.15 ~ p.24
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A Long-term Retrospective Study of Implant Reconstruction in Posterior Edentulous Mandible
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Abstract
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Many long-term study have demonstrated the successful.use of osseointegrated implants to replace posterior teeth in the partially dentate patients. Implant were recently selected as the treatment of the choice for this population, instead of the previous resolves for the shortened dental arch (removable partial dentures, single or multiple cantilevers, or continued premolar occlusion). Advantages of patients with implant-supported prosthesis included an improved masticatory apparatus, reduced stress on the remaining anterior segments of the dentition, esthetics, comfort, and psychological benefits etc.
But, there are many obstacle to implant placement in posterior mandible. The shape, quantity, and quality of bone in the mandible as anatomical limitation and heavy occlusal force as mechanical disadvantage are significant factors in deciding which implant.options possible. Consideration of these factors is necessary for the successful diagnosis and implant treatment of partially edentulous arches. PURPOSE : The purpose of this retrospective longitudinal study is to evaluate the long-term outcome, determinants of outcome, and the type and prevalence of prosthetic complications in the series of the patients treated with implants in the partially edentulous posterior mandible. MATERIAL AND METHODS : A total of 107 consecutively placed implants were inserted in 38 partially edentulous patients and restored with single-tooth and fixed partial dentures restoration at Korea University Guro-hospital from April 1991 to December 1999 . The patients ranged in age from 22 to 72 years, and 54% were female. We analysed statistically long-term outcome according to type, length, and diameter of the fixture and complications according to fixture number and prosthetic type.
RESULTS e The results were as follows
1. The overall outcome showed an implant success rate of 97.2 % in posterior partially edentulous mandible
2. In the proportion of the fixture length ; 10mm (22.4%), 11.5-12.0mm (19.6%), 13.0mm (19.6%) fixture were respectively predominant in order .
In the proportion of the fixture width ; 3.75mmm (47.7%), 5.0mm (36.4%) were predominant in order. 3. According to surface types of fixture, success rate were pure titanium 95.9%, TPS coating 100%, HA
coating 100%.
4. A total of the 107 implants showed 20 complications (18.7%). the most common complications (7cases) was loosening of the abutment screw and gold screw.
5. Prosthetic complications with regard to fixture number showed higher prevalence one implant (30%), two implant (12.9%), three implant (11.1%) in order.
6. According to the prosthetic type, complications of screw type were 10 cases and cementation type were 4 cases.
CONCLUSION : This study offers efficacious results of implant supported fixed prostheses as an alternative to traditional prostheses in patients with posterior partial edentuliom. Therefore, we think that implant prosthesis is a relatively safe and predictable method for restoring partially posterior edentulous
areas.
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