Adhesion Strength of Orthodontic Brackets to Provisional Crowns: A Systematic Review

Aim: This systematic review assessed the shear bond strength of orthodontic brackets bonded to temporary crowns. The study followed PRISMA guidelines and the Cochrane Guidelines for Systematic Reviews, with a registered protocol (PROSPERO: CRD42023447478). Materials and Methods: in vitro studies were included, while animal studies, case reports, and abstracts were excluded. A comprehensive search strategy was implemented in multiple databases and supplemented with manual searches. Two independent reviewers screened studies, and data were extracted using a standardized form. Risk of bias was assessed using the RoBDEMAT tool. Meta-analysis was performed using random-effects models. Results: Out of 514 identified records, 21 studies were included. Various surface conditioning methods, adhesives, and brackets were used. Shear bond strength ranged from 0.03 to 22.54 MPa. Most studies had a risk of bias due to inadequate reporting. Significant heterogeneity was observed and outliers were removed. Conclusions: This review highlights the importance of combining chemical and mechanical surface treatments for bonding orthodontic brackets to provisional crowns. However, further research with rigorous methodology is required to establish more conclusive findings.