Short communication: pre- and co-curing effect of adhesives on shear bond strengths of composite resins to primary enamel and dentine: an in vitro study

To evaluate and compare shear bond strengths of composite resins to primary enamel and dentine when the adhesives are pre-cured (light cured before the application of the resin) or co-cured (adhesive and the resin light cured together). Buccal surfaces of 80 caries-free primary molars were wet groun...

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Bibliographic Details
Published in:European archives of paediatric dentistry 2011-12, Vol.12 (6), p.308-311
Main Authors: Viswanathan, R, Shashibhushan, K K, Subba Reddy, V V
Format: Article
Language:English
Subjects:
Composite materials
Composite Resins - radiation effects
Dental Bonding
Dental Enamel
Dental Stress Analysis
Dentin
Dentin-Bonding Agents - radiation effects
Dentistry
Humans
Light-Curing of Dental Adhesives - methods
Molar
Polymethacrylic Acids - radiation effects
Properties
Resin Cements - radiation effects
Shear Strength
Time Factors
Tooth, Deciduous
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Summary:To evaluate and compare shear bond strengths of composite resins to primary enamel and dentine when the adhesives are pre-cured (light cured before the application of the resin) or co-cured (adhesive and the resin light cured together). Buccal surfaces of 80 caries-free primary molars were wet ground to create bonding surfaces on enamel and dentine and specimens mounted on acrylic blocks. Two bonding agents (Prime and Bond NT® and Xeno III®) were applied to either enamel or dentine as per manufacturer's instructions. In 40 specimens, the bonding agent was light cured immediately after the application (pre-cured). The other 40 specimens were not light cured until the composite resin application (co-cured). Resin composite cylinders were made incrementally using acrylic moulds over the adhesives and light cured. Specimens were stored in deionised water for 24 hours at room temperature. Shear bond strength was measured using an Instron universal testing machine (in MPa) and was analysed with Student's unpaired t test. Light curing the adhesive separately produced significantly higher bond strengths to primary dentine than co-curing (p0.05). Curing sequence had no significant effect on shear bond strength of adhesives on the primary enamel. Pre-curing adhesives before curing composite resins produced greater shear bond strength to primary dentine.
ISSN:1818-6300
DOI:10.1007/BF03262829