Does surface priming increase the bond strength of orthodontic brackets? An experimental study

Abstract Objective To evaluate the effects of metal primer II (MP II) on the shear bond strength (SBS) of orthodontic brackets bonded to teeth and bis‐acryl composite provisional material (Bis‐Acryl). Material and Methods Twenty extracted human premolars specimens and 20 premolar shaped Bis‐Acryl specimens were obtained and randomly divided into two surface groups. The first group consisted of human premolars (T) bonded to brackets in the conventional way while in the second (T‐MP) MP II was applied on the bracket base before bonding. Similarly, one group of provisional material (PM) was prepared according to conventional treatment and another with the application of MP‐II metal bonder (PM‐MP). In all cases Ortho‐brackets (Victory Series, 3 M) were bonded employing Transbond XT resin cement. Then the brackets were debonded under shear and the results were statistically analyzed by two‐way analysis of variance and Holm Sidak at α = .05. The debonded surfaces of all specimens were examined by light microscopy and the Adhesive Remnant Index (ARI) was recorded. Results The SBS results exhibited significant differences er (p