Comparison of the shear bond strengths of conventional mesh bases and sandblasted orthodontic bracket bases

• Autor(a) principal: Torres Lugato, Isabel Cristina Prado [UNESP]
• Data de Publicação: 2009
• Outros Autores: Pignatta, Lilian Maria Brisque [UNESP], Arantes, Flávia de Moraes [UNESP], Santos, Eduardo Cesar Almada [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1590/S1806-83242009000400010; http://hdl.handle.net/11449/71184
• topic: Orthodontic brackets; Orthodontics; Shear strength; acrylic acid resin; aluminum oxide; aluminum silicate; bisphenol A bis(2 hydroxypropyl) ether dimethacrylate; Fuji Ortho LC; glass ionomer; resin cement; stainless steel; tooth cement; Transbond; Transbond XT; adhesion; animal; cattle; chemistry; comparative study; dental bonding; in vitro study; materials testing; orthodontic device; shear strength; standard; surface property; time; Acrylic Resins; Adhesiveness; Aluminum Oxide; Aluminum Silicates; Animals; Bisphenol A-Glycidyl Methacrylate; Cattle; Dental Bonding; Dental Cements; Glass Ionomer Cements; Materials Testing; Orthodontic Brackets; Resin Cements; Shear Strength; Stainless Steel; Surface Properties; Time Factors

This study aimed to compare in vitro the shear bond strength between metallic brackets (Abzil) with conventional mesh bases and metallic brackets with bases industrially sandblasted with aluminum oxide using three adhesive systems, in order to assess the influence of sandblasting on adhesiveness and to compare 3 different bonding systems. Two hundred and forty bovine incisors were used and randomly divided into 6 groups (40 teeth in each group), according to the bracket base and to the bonding system. The brackets were direct-bonded in bovine teeth with 3 adhesive systems: System A - conventional Transbond™ XT (3M -Unitek); System B - Transbond™ Plus Self Etching Primer + Transbond™ XT (3M - Unitek) and System C - Fuji ORTHO LC resin-reinforced glass ionomer cement in capsules (GC Corp.). Shear bond strength tests were performed 24 hours after bonding, in a DL-3000 universal testing machine (EMIC), using a load cell of 200 kgf and a speed of 1 mm/min. The results were submitted to statistical analysis and showed no significant difference between conventional and sandblasted bracket bases. However, comparison between the bonding systems presented significantly different results. System A (14.92 MPa) and system C (13.24 MPa) presented statistically greater shear bond strength when compared to system B (10.66 MPa). There was no statistically significant difference between system A and system C.