Abstract
BackgroundAt present, the demand for orthodontic treatment is on the rise. On the other hand, evidence shows that the bond strength of composite resins to old composite restorations is often unreliable. Therefore, the aim of this in vitro study was to assess the effect of different surface treatments on shear bond strength (SBS) of ceramic brackets to old composite restorations.MethodsIn this in vitro experimental study, 60 nano-hybrid composite discs were fabricated. For aging, the discs were incubated in deionized water at 37 °C for 1 month. Next, they underwent 4 different surface treatments namely acid etching with 37% phosphoric acid, sandblasting, grinding, and Er,Cr:YSGG laser irradiation. Ceramic brackets were then bonded to the discs and underwent SBS testing.ResultsThe maximum mean SBS value was obtained in the grinding group (9.16 ± 2.49 MPa), followed by the sandblasting (8.13 ± 2.58 MPa) and laser (6.57 ± 1.45 MPa) groups. The minimum mean SBS value was noted in the control group (5.07 ± 2.14 MPa).ConclusionAll groups except for the control group showed clinically acceptable SBS. Therefore, grinding, sandblasting, and Er,Cr:YSGG laser are suggested as effective surface treatments for bonding of ceramic orthodontic brackets to aged composite.
Highlights
IntroductionEvidence shows that the bond strength of composite resins to old composite restorations is often unreliable
At present, the demand for orthodontic treatment is on the rise
Considering the increasing demand of orthodontic patients to use ceramic brackets due to their optimal esthetics, and the importance of adequate bond strength of brackets to old composite, the aim of this study was to assess the effect of different surface treatments on shear bond strength (SBS) of ceramic brackets to old composite restorations
Summary
Evidence shows that the bond strength of composite resins to old composite restorations is often unreliable. The increasing demand of adults for orthodontic treatment has been associated with some problems. Since many adult patients requiring orthodontic treatment have several composite, amalgam, and porcelain restorations, orthodontists face more challenges in bracket bonding to restored teeth. This problem is more evident in patients with composite restorations especially in the labial surface of their maxillary incisors or buccal surface of their posterior teeth [1]. Evidence shows that the bond strength of composite resin to old composite restorations is often unreliable [2]. It has been proven that the etching process with orthophosphoric acid cannot alter the surface topography of composite resin, and only cleans the superficial layer [4, 5] increasing the bond strength between the new and old composite usually requires additional surface roughening of the old composite to improve mechanical interlocking and subsequent coating of the surface with the bonding agent to improve surface
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