Clinical evaluation was performed every 6 months for the first 2 years then yearly. Survival and success rates were evaluated and recorded, following the definitions and parameters described elsewhere. Any surgical, prosthetic, or clinical complication was recorded. Prosthetic success was evaluated as follows: prosthesis in function, without mobility and pain, even if in the face of the loss of one or more implants. Radiographic evaluation was performed through the use of periapical radiographs with individualized holders to measure marginal bone loss around implants over time in comparison with the bone level at the time of provisional prosthesis placement (baseline). Measurements were performed with ImageJ version 1.46 (National Institutes of Health, Bethesda, Md).