Clinical Study On Success Rate Of Osseointegrated Dental Implants

Kim, Young Suk; Lee, Dong Keun; Min, Seung Ki; Lee, Jun; Moon, Chul

Abstract

The purpose of this study is to review the prognosis of the endosteal osseointegrated dental implants placed in the total and partial edentulous area of mandible and maxilla and to suspect the possible causes leading to failure. 301 osseointegrated dental implants that had been inserted between 1992 thru 2000 were followed up for over one year (average follow up : three years)in function.Medical records and radiographs included CT were evaluated and analyzed by the overall success rate,gender and age factor,general disease,implant fixture length and diameter,surface status of implant, bone density,and the stage of removal.Chi squire test was used statistically. Of the 301 osseointegrated dental implants, 18 dental implants (6.0%)were removed and cumulative survival rate was 94%.No significant difference in the failure rate were found between male (5.4%)and female (6.5%). The failure rate were 8.0%in the fifties,7.3%in the forties,5.2%in the thirties, 4.6%in the sixties.Patients who had systemic disease were highly related with failure rate (25%),and cumulative survival rate was 75%.Success rate was the highest in the premolar area than anterior and molar area (p<0.05).The failure rate was highest in the D4 bone (12.5%). High failure rate was found in the wide diameter implant (9.7%)and 7~9mm short implant (12.5%). No significant difference in the failure rate were found between implant surface condition.Stages of removal were pre-prosthetic (16 implants)and post-prosthetic (2 implanrs)stage. The failure rate in the conventional technique was 5.1%,19.1%in the GBR,10%in the sinus lifting.Marginal bone resorption around the implants were found 0.15mm in the 3 months,0.4mm in the 6 months,0.71mm in the 1 year,0.9mm in the 2 years and 1.06mm in the 3 years.