INTRODUCTION: An accurate diagnosis as well as the correct selection of materials, brackets in particular, are important pre-requisites for success in orthodontic therapy. AIM: The aim of this study was to examine the influence of various brackets-base designs on bond strength. METHODS: Six models were evaluated by a test of sheer bond strength: Discovery (Dentaurum) - metallic with laser grooves and 13.12mm² of base area; Monobloc (Morelli) - metallic one-piece with raised bumps and 10.22mm² of area; Edgewise Standard (Ortho Organizers) - metallic with MIM (Metal Injection Molding) and 12.02mm² of area; Illusion Plus (Ortho Organizers) - ceramic with retention ridges and 13.49mm² of area; Composite (Morelli) - polycarbonate with raised bumps for mechanical retention with 14.68mm² of area; and Edgewise Standard (Morelli) - metallic with single mesh and 14.31mm² of area. The brackets were bonded on bovine teeth with Fill Magic Ortodôntico (Vigodent) bond agent, for testing. The study was conduced in a universal test machine (EMIC), and the bond strength was recorded at the moment of split by TESC software, 3.01 version; it was calculated in newtons (N) and megapascal (Mpa). RESULTS AND CONCLUSIONS: No statistical difference among tested brackets was found, and the group with the greatest average bond strength was Discovery with 10,12Mpa.
Shear bond strength; Orthodontics; Brackets
