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Objective: The aim of this study was to systematically review the safety and effectiveness of the injectable biostimulators dermal fillers calcium hydroxyapatite (CaHA) and polycaprolactone (PCL) in facial esthetic procedures. Materials and Methods: Comprehensive electronic searches were executed across six academic databases. The primary outcome focused on safety by examining studies that reported the incidence of adverse events (AEs). The secondary outcome gauged the satisfaction of the patients and injectors by validated esthetic scales. To evaluate biases, the Joanna Briggs Institute Checklist tools were employed. Results: We included a total of 79 studies. In the quantitative assessment of the CaHA, out of 5032 injected patients, 21.8% manifested early AEs, 0.85% experienced delayed reactions, and 0.27% had severe complications. Within the PCL group, consisting of 1119 patients, 83.3% exhibited early AEs, 5.6% had delayed reactions, and none had serious complications. Regarding esthetic satisfaction outcome, both products presented favorable results, but a limited number of studies assessed these data. In the studies evaluated qualitatively, a broad array of AEs were cataloged. Conclusions: The occurrence of serious AEs associated with CaHA and PCL fillers is relatively low. Both CaHA and PCL fillers exhibit favorable safety profiles, with most AEs being transient in nature. [ABSTRACT FROM AUTHOR]

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