Histologic analysis of two dental implants extracted after osseointegration

Purpose. The aim of this case report is to analyze and observe the bone tissue formation around two dental implants after their osseointegration. Methods and Materials. A 58 y.o. woman was referred to the Division of Periodontology and Implantology (University of Bologna, Italy) due to severe pain and discomfort caused by two of the four dental implants placed in the upper jaw (sites #13 and #23) in a private practice 8 months before. Implants were made of titanium, sandblasted with zirconium oxide and etched with mineral acids (Sweden&Martina, Due Carrare, Italy). At clinical and radiographic analysis, implants appeared properly osseointegrated but placed tilted way too buccaly, with their emergence profile in non-keratinized oral mucosa. For the above-mentioned reasons, the patient started having discomfort immediately after the prosthetic load occurred four months after implants placement. The patient was rehabilitated with an implant supported removable prosthesis. The patient explained difficulties to perform adequate oral hygiene and declared pain every time she was wearing the implant-supported removable prosthesis. The implants were removed, preserving the bone around implant threads, and replaced with two new dental implants, placed in a prosthetic-guided correct inclination. The removed implants were processed for histological analysis in accordance with Checchi V. & al, 2015. Results. The histological analysis revealed proper osseointegration of the implant fixture after eight months (4x figures). Histological views of biopsies show good bone-implant contact recorded from the coronal side to the apical implant section (4x figures). Presence of direct connecting bridges between the peri-implant bone trabeculae and the implant surface were recorded (10x figures). Conclusions. This case report clearly shows how after 8 months from implant placement, the fixtures coated with a rough surface were properly osseointegrated with good bone-implant contact recorded along their entire surface.