Abstract
Introduction: Bond strength is an important property and determines the amount of force delivered and treatment duration in orthodontics. Many light-cured bonding materials are being used; but it is required to determine the most efficient one withdesired bond strength.
 Objective: To determine and compare the shear bond strength of three visible light-cured composites (Transbond XT, Heliositand Enlight) and two self-cured composites (Rely-a-bond and Concise).
 Materials & Method: 100 extracted premolars were collected and randomly divided into 5 test groups of different adhesives. Brackets were bonded to the teeth in each test group with the respective adhesive according to the manufacturer’s instructions. Each specimen was debonded using Universal Testing Machine and the shear bond strength for each specimen was calculated. All the groups were compared by ANOVA one-way test.
 Results: There were statistically significant differences among the five groups (P<0.05). The shear bond strength of Enlight (13.92 ± 3.92) is similar to Transbond XT (14.30 ± 4.35).
 Conclusion: Light cure composites showed higher bond strength than self cure composites.
Highlights
Bond strength is an important property and determines the amount of force delivered and treatment duration in orthodontics
More study is warranted in this subject as there have been conflicting reports in the literature. It is evident from the present investigation that; the composite resin adhesives should be utilized in orthodontics for their good shear bond strength
Acceptable shear bond strength was achieved by Transbond XT, Heliosit, Rely-a-bond, Concise adhesives
Summary
Bond strength is an important property and determines the amount of force delivered and treatment duration in orthodontics. Many light-cured bonding materials are being used; but it is required to determine the most efficient one with desired bond strength. Objective: To determine and compare the shear bond strength of three visible light-cured composites (Transbond XT, Heliosit and Enlight) and two self-cured composites (Rely-a-bond and Concise). Materials & Method: 100 extracted premolars were collected and randomly divided into 5 test groups of different adhesives. Brackets were bonded to the teeth in each test group with the respective adhesive according to the manufacturer’s instructions. Newman[2] in 1965 used this technique for bonding plastic brackets with epoxy resin. This paved the way for direct bonding of bracket in orthodontic practice. Bowen’s resin is an acrylic-modified epoxy resin with setting advantage of acrylic and dimensional stability and strength of epoxy resin
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