The clinical effectiveness of screw type Implant “Nisastan system” in the posterior region of the mandible: A 2 year prospective study

The clinical effectiveness of screw type Implant “Nisastan system” in the posterior region of the mandible: A 2 year prospective study Dr. M. Rismanchian * - Dr. R. Birang ** * Assistant Professor of Fixed Prosthodontics Dept., Faculty of Dentistry, Isfahan University of Medical Sciences. ** Assistant Professor of Periodontics Dept., Faculty of Dentistry, Isfahan University of Medical Sciences. Abstract Background and Aim: The aim of this study was to evaluate the quality and effectiveness of Nisastan screw type implants over a two year follow-up period. Materials and Methods: 21 patients including 10 male and 11 female with the age range of 21-62 years old with anadontia in the posterior regions of their mandibles were selected to participate in this study. Total of 58 Nisastan implants were used in the lower jaws. After elapse of the osteointegration period, 64 units of fixed partial prosthesis were placed on these implants. Patients were evaluated clinically and radiographically at the loading time, one year and two years later. The survival rate and success indices like pocket depth, plaque index, bleeding index and crestal bone resorption were recorded. Results: The success rates of implants were 94.4% and stability of the abutments and prosthesis were 96.1% after two years. The mean crestal bone loss was 1.08-1.43 mm. The plaque index in 56.5% of areas was zero at the loading time while 64.5% of areas were zero at the end of study. The bleeding index in the 49.5% and 65.65% of areas was zero at those times respectively. Conclusion: The Nisastan Implants showed acceptable performance during the two year period of study. Key words: Nisastan - Dental implant - Clinical evaluation - Success rate Correspondence Author: Fixed Prosthodontics Dept., Faculty of Dentistry, Isfahan University of Medical Sciences. e.mail:[email protected]