CONNESSIONI IMPIANTO-ABUTMENT VALUTAZIONE DEL RIASSORBIMENTO OSSEO PERIMPLANTARE IN DUE SISTEMATICHE A CONFRONTO

Implant-abutment connection evaluation of bone loss for two different implants. Introduction: Peri-implant bone resorption around implant-abutment connection induces dental Implant companies to improve quality production and implant design to better clinical outcome. Moreover there is a growing interest in scientific community as it is shown by the greater and greater numbers of articles that treat thisargument. Purpose: the aim of this study was to analyse perimplant bone loss and investigate the negative aspects that interfere with osseointegration process. Bone loss is due to biological, mechanical and traumatic causes. Materials and Methods: We have analized two different implants (produced by the same Company) that mostly differ from one another in the implant-abutment connection. The first has an internal connection and a coronal machined neck, the second has an external connection and an all treated surface. Radiographs have been taken at baseline and after 4 years and have been compared. The results have been analyzed statistically. Result: We found a mean bone loss of 1,359 mm and 0,739 mm for the external and internal connection respectively. There is a significant difference P < 0,0001. We assume that micro-gap, micro-motion and stress distribution at the connections of implants, as well as the biological width at the implant surface and the microbiological enviroment at the implant sulcus work all together sinergically and impair the result. Conclusion:  The implant-abutment connection influences the biomechanical and biological enviroment of perimplant bone. The external connection is followed by a significant reduction of crestal bone levels. However we think that more studies with larger samples are needed to confirm the findings obtained.