RESUMO
PURPOSE: To realize a systematic review with prospective meta-analysis aiming to compare the accuracy of static fully guided implant placement depending on the drill key modality (conventional drill key surgery systems versus newer keyless systems) and evaluate the impact of deviations factors. MATERIALS AND METHODS: An electronic systematic search was conducted to identify prospective clinical trials matching inclusion criteria. The variables of interest were coronal global, apical, vertical, and angular deviations. The types of edentulism, and surgical guide support were investigated as deviation factors. Meta-regression (mixed-effect model) was performed. Heterogeneity was assessed using Cochrane's I² test and interpretation thresholds. RESULTS: A total of 1233 implants in 475 patients were analyzed (18 studies included). Coronal global deviation was significantly lower in the keyless group than in the key group (-0.36 mm; 95% confidence interval [CI] -0.62, -0.09; p=0.008). Angulation control of the keyless system was superior to that of the key system (-0.36 degrees; 95% CI -0.75, 0.02; p=0.063). Non-significant differences were found between both groups in apical (p=0.684) and vertical deviations (p=0.958). Significant influence of the type of edentulism (single, partial, total) and surgical guide support (tooth, mucosa, bone) on the overall amount of coronal global, apical, and angular deviations was found (p<0.001). Lowest deviations were found in partial edentulism and tooth-supported surgical guide groups. (p<0.001). CONCLUSION: Keyless static fully guided surgical systems allowed significantly better control of coronal and angular deviations than conventional systems. The types of edentulism and surgical guide support seemed to influence the positioning accuracy.
