Effects of surface treatment and aging on the bond strength of orthodontic brackets to provisional materials.

Purpose: The aim of this study was to evaluate the effects of different surface treatments and aging on the bond strength of orthodontic brackets bonded to provisional materials (autopolymerizing polymethylmethacrylate [PMMA] resins and bis-acryl composite). The mode of failure was also compared.

Material: One hundred twenty flat-surfaced disks of each provisional material were fabricated and embedded in acrylic molds.