Abstract
Several adhesive systems have been developed in the last decade. The aim of the current study was to evaluate the shear bond strength of orthodontic brackets bonded with conventional primers or self-etching primers, artificially aged by means of thermocycling and thermomechanical procedures.90 bovine incisors were used in the investigation. The roots were sectioned in the amelo-cementary junction. All samples were randomly divided in 2 groups ( n= 45), according to the primer used for bracket bonding. XT Group–hydrophobic conventional primer (Transbond XT, 3M unitek, Monrovia, Calif); SEP Group –self-etching primer (Transbond Plus SEP, 3 M Unitek, Monrovia, Calif). All specimens were bonded with XT Transbond resin adhesive (3 M Unitek, Monrovia, Calif). A Universal Testing Machine EMIC DL2000 (EMIC Equip. Sist. Ensaio Ltda., São José dos Pinhais, PR, Brazil) was used for the collection of the values of SBS resistance. The results of the current study were: (Prompt L-Pop 1.72±0.13 MPa; Clearfil SE Bond 1.75±0.19 MPa; FL Bond 1.71±0.22 MPa; One-Up Bond 1.77±0.14 MPa; XT Control 10.5±0.86 MPa). In conclusion: the number of cycles in thermal and thermo mechanical cycling did not influence shear bond strength values for any of the primers tested;SEP Transbond Plus showed the greatest values for bond strength of orthodontic brackets.
Highlights
One of the main challenges for modern clinicians is to obtain a good adhesion of materials to dental structure, once it is necessary for both preventive and restorative procedures.Since 1955, when Buonocore introduced the acid-etching bonding technique, the concept of bonding resin-based materials to enamel has favoured the development of its application in preventive and restorative procedures in dentistry, including the bonding of orthodontic brackets [1]
The results showed that self-etching primers (SEP) is promissing in orthodontic practice due to adequate values of shear bond strength (SBS), even under TC or TM fatigue
Various authors have accepted the SBS test performed for bovine enamel [11,12,13,14]
Summary
One of the main challenges for modern clinicians is to obtain a good adhesion of materials to dental structure, once it is necessary for both preventive and restorative procedures. Since 1955, when Buonocore introduced the acid-etching bonding technique, the concept of bonding resin-based materials to enamel has favoured the development of its application in preventive and restorative procedures in dentistry, including the bonding of orthodontic brackets [1]. Several adhesive systems have been developed in the last decade. These materials can be divided in two groups according to their clinical applications. The first group includes enamel etching with phosphoric acid, followed by the application of primer/resin adhesive
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