Marginal bone loss of posterior rehabilitation with injection molded zirconia implant: partial results of 24-month follow-up
Aluno: Fausto Ramírez Gracia
Orientador(a): Prof. Dr. Rubens Moreno de Freitas
Área: Implantodontia
Ano: 2024
ABSTRACT
The demand for metal-free and more esthetic implants lead to the development of zirconia implants. This study aimed to evaluate the peri-implant bone loss of a two-piece injected molded zirconia implant in a 24-month follow-up. Thirty-eight implants were placed in 30 patients. The loading protocol was selected according to each patient’s needs and the manufacturer’s instructions. All patients received temporary prostheses, and after three months, they received the definitive crowns cemented over the abutment. Patients were re-evaluated 6, 12 and 24 months after implant loading. Peri-implant bone level and bone changes were calculated for each patient visit and visit intervals. Additionally, implant cumulative survival and success rates were calculated. Quantitative variables were described by mean, standard deviation, median, minimum, and maximum. For qualitative variables, absolute and relative frequencies were provided. Data from the 24-month follow-up visits (T12) was available for 26 patients and 30 implants. A higher marginal bone level was observed in the implant placement visit compared to follow-up visits. At 24 months visit, a mean bone loss of 0.30±0.31mm (range -0.88 to 0,12) was observed, considering bone levels at the time of implant placement. In total, four implants were lost before the final prosthesis installation, within four months of follow-up, leading to a cumulative implant success rate of 97.3% (95% CI: 93.3 – 99.3%). Six patients experienced local edema, pain, and suppuration. Technical and mechanical complications were observed, such as abutment fracture, prosthesis fracture, loss of prosthesis cement retention, excessive bone resorption, and implant failure. This study’s results confirm the peri-implant bone level maintenance in up to 24 months of follow-up.