Incidence of Complications in Immediate Loading Conometric vs. Screw-Retained Full-Arch Prostheses: Retrospective Study on 1356 Implants.

Abstract

Introduction: 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.

Materials and methods: 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.

Results: 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.

Conclusions: 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.