Bracket bonding to polymethylmethacrylate-based materials for computer-aided design/manufacture of temporary restorations: Influence of mechanical treatment and chemical treatment with universal adhesives

Abstract

ObjectiveTo assess shear bond strength and failure mode (Adhesive Remnant Index, ARI) of orthodontic brackets bonded to polymethylmethacrylate (PMMA) blocks for computer-aided design/manufacture (CAD/CAM) fabrication of temporary restorations, following substrate chemical or mechanical treatment.MethodsTwo types of PMMA blocks were tested: CAD-Temp® (VITA) and Telio® CAD (Ivoclar-Vivadent). The substrate was roughened with 320-grit sandpaper, simulating a fine-grit diamond bur. Two universal adhesives, Scotchbond Universal Adhesive (SU) and Assure Plus (AP), and a conventional adhesive, Transbond XT Primer (XTP; control), were used in combination with Transbond XT Paste to bond the brackets. Six experimental groups were formed: (1) CADTemp®/SU; (2) CAD-Temp®/AP; (3) CAD-Temp®/XTP; (4) Telio® CAD/SU; (5) Telio® CAD/AP; (6) Telio® CAD/XTP. Shear bond strength and ARI were assessed. On 1 extra block for each PMMA-based material surfaces were roughened with 180-grit sandpaper, simulating a normal/medium-grit (100 mm) diamond bur, and brackets were bonded. Shear bond strengths and ARI scores were compared with those of groups 3, 6.ResultsOn CAD-Temp® significantly higher bracket bond strengths than on Telio® CAD were recorded. With XTP significantly lower levels of adhesion were reached than using SU or AP. Roughening with a coarser bur resulted in a significant increase in adhesion.ConclusionsBracket bonding to CAD/CAM PMMA can be promoted by grinding the substrate with a normal/medium-grit bur or by coating the intact surface with universal adhesives. With appropriate pretreatments, bracket adhesion to CAD/CAM PMMA temporary restorations can be enhanced to clinically satisfactory levels.

Shear bond strength of different bonding agents to orthodontic metal bracket and zirconia

“…Normally, RUC is used as an adhesive resin cement in prosthodontic treatment, and it is more liquid than the traditional cement commonly used for orthodontic bracket, such as FLC and XT used in this study. Better physical mobility makes RUC better penetrate into the groove of the bracket bottom plate, thus forming better mechanical interlocking 33) .…”

Shear bond strength of orthodontic molar tubes to composite restoration bonded with particular adhesives after different surface pre‐treatments

“…The Assure Plus company, whose popularity in adhesives has increased in recent years, 8 has claimed that Assure Plus is better at bonding than other adhesive systems both to enamel and restoration surfaces. 13,14 The originality of this study is that it evaluated the shear bond strength of orthodontic attachments on composite restoration surfaces in terms of both different surface treatments and different adhesive systems on extracted teeth. It is also one of the limited studies evaluating the bond strength of molar tubes in naturally extracted teeth with Assure Plus.…”

“…8 Although Assure Plus is a new adhesive, it has been reported that it is more effective in terms of shear bond strength in a limited number of studies in the literature. 13,14 However, since the product is new and the number of these studies is very limited, more evidence-based studies are needed.…”

Three-Dimensional Digital Superimposition of Orthodontic Bracket Position by Using a Computer-Aided Transfer Jig System: An Accuracy Analysis

“…With the aid of CAD/CAM systems, high-quality orthodontic treatment is expected to be achieved [ 29 , 30 ]. The accuracy of bracket transfer jigs has also increased as the technologies, especially CAD/CAM systems, have been developed.…”