title: Comparison of the shear bond strengths of conventional mesh bases and sandblasted orthodontic bracket bases.
abstract: 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.
authors.affiliation: School of Dentistry of Araçatuba, São Paulo State University, Araçatuba, SP, Brazil.
authors.forename: Isabel Cristina Prado Torres
authors.initials: IC
authors.lastname: Lugato
authors.forename: Lilian Maria Brisque
authors.initials: LM
authors.lastname: Pignatta
authors.forename: Flávia de Moraes
authors.initials: Fde M
authors.lastname: Arantes
authors.forename: Eduardo César Almada
authors.initials: EC
authors.lastname: Santos
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000268:Adhesiveness; D000537:Aluminum Oxide / Q000737:chemistry*; D000538:Aluminum Silicates / Q000737:chemistry; D000818:Animals; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002417:Cattle; D001840:Dental Bonding / Q000592:standards; D003738:Dental Cements / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000737:chemistry; D066298:In Vitro Techniques; D008422:Materials Testing; D016910:Orthodontic Brackets; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength; D013193:Stainless Steel / Q000737:chemistry; D013499:Surface Properties; D013997:Time Factors
chemical_list: D000180:Acrylic Resins; D000538:Aluminum Silicates; D003738:Dental Cements; C095451:Fuji Ortho LC; D005899:Glass Ionomer Cements; D019279:Resin Cements; C477790:Transbond XT; D013193:Stainless Steel; C065742:Transbond; D017438:Bisphenol A-Glycidyl Methacrylate; D000537:Aluminum Oxide