Abstract
ABSTRACTAims and objectives: To measure and compare the shear bond strength and adhesive remnant index of light-cure composite. (Enlight, Ormco.) and dual-cure composite (Phase II dual cure, Reliance Ortho).Materials and methods: Sixty extracted human premolar teeth were divided into two groups: group I (blue): conventional light cure composite resin. (Enlight, Ormco.) and group II (green): dual cure composite resin. (Phase II dual cure, Reliance Ortho.) with 30 teeth in each group. These samples were tested on the universal testing machine to measure the shear bond strength.Results: Student t-test showed that the mean shear bond strength of the conventional light cure group (8.54 MPa - 10.42 MPa) was significantly lower than dual cure group (10.45 MPa -12.17 MPa).Conclusion: These findings indicate that the shear bond strength of dual-cure composite resin (Phase II dual cure, Reliance Ortho) is comparatively higher than conventional light-cure composite resin (Enlight, Ormco). In the majority of the samples, adhesive remnant index (ARI) scores were 4 and 5 in both the groups whereas score 1 is attained by the least number of samples in both the groups.How to cite this article: Verma G, Trehan M, Sharma S. Comparison of Shear Bond Strength and Estimation of Adhesive Remnant Index between Light-cure Composite and Dual-cure Composite: An in vitro Study. Int J Clin Pediatr Dent 2013;6(3):166-170.
Highlights
Rapid strides in material science over the years have produced progressively advanced materials making the direct bonding procedure more precise, comfortable and time-effective
In the conventional light-cure group, the shear bond strength ranged from 8.54 to 10.42 MPa and in case of dual-cure group, the shear bond strength ranged from 10.45 to 12.17 MPa (Table 1). This shows that the shear bond strength of the dual cure group was significantly higher than conventional light-cure group (Graph 1)
Our study basically aims to measure the shear bond strength of orthodontic brackets, using light-cure composite resin (Enlight, Ormco) and dual-cure composite resin (Phase II dual cure, Reliance Ortho), so that we get a better idea about the clinical performance of this new material when compared simultaneously with the conventional one
Summary
Rapid strides in material science over the years have produced progressively advanced materials making the direct bonding procedure more precise, comfortable and time-effective. In 1978 after their introduction, light activated composites have largely replaced chemically activated systems in dentistry This has been due to the clinical advantages of these products in that it gives the operator virtually unlimited working time to position the brackets accurately since the material can be cured at will. Light activated composites have a higher initial bond strength enabling immediate placement of archwires. In spite of these advantages the main disadvantages of light activated composites are the increased time for bonding and the clinician may never be totally assured of the complete polymerization of the resin under the bracket.[1,2,3,4,5,6,7,8]
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