Retrospective study evaluates complications and success rates in 203 patients with 1356 implants, indicating high success across both prosthesis types.
The purpose of the present retrospective study was to analyze the clinical outcomes of immediate loading complete rehabilitations with screw-retained or conometric implant prosthesis. 203 patients treated with complete immediate-loading prostheses were evaluated with a total of 1356 implants supporting 261 fixed prostheses: 65 with conometric retention and 196 with screw-retention. Implant survival, prosthesis success rate, technical and biological complications were evaluated. Chi-square test was carried out to evaluate possible statistically significant differences between the two implant prosthesis types. During the follow-up period (mean: 28.5 months; range: 12-80 months) 27 implants failed (2%) and global prosthetic success rate was 89.3%. No statistically significant differences were found in implant survival and prosthesis success between the two groups. Screw loosening was the most frequent complication (4.2% of cases) followed by chipping/fracture of the veneering material. Prosthesis loss of retention (detachment) occurred in 9.2% of the conometric prostheses. Both conometric and screw-retained complete immediate loading rehabilitations presented high prosthesis success rate and low incidence of complications, with the most frequent complication being screw loosening. Conometric prostheses showed a significant greater incidence of prosthesis detachment.
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Biscaro et al. (2025) studied this question.
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