The Effect of Different Bonding Techniques On Microtensile Bond Strength Of Composite Resin To Dentin.

Document Type : Original Article

Authors

1 Restorative dentistry department ,Faculty of dentistry,Pharos university,Alexandria,Egypt.

2 Restorative dentistry department ,Faculty of dentistry,Tanta university,Egypt.

Abstract

Objectives: To assess the influence of preheating the bonding agent applied to blot dried v.s air dried dentin on composite-to-dentin microtensile bond strength. Materials and Methods: 40 sound extracted human molars were used. The occlusal surface were flattened to reach sound dentin . The dentin surface was then etched with 37% phosphoric acid . The specimens were divided to two groups .Group1 dentin was blot dried using a disposable micro sponge and group2 dentin was air dried using compressed air. Both groups were divided into 2 sub-groups to receive either a pre-heated bonding agent or unheated one. Tetric N-ceram composite was used to build-up a cylindrical block ( 4x8 mm.)diameter bonded to the reduced dentine surface by using of ethanol\water based universal dentin bonding agent(Nova compo-B Plus). Then all composite cylinder including the bonded dentin area of all teeth were sectioned to obtain around 80 cuboidal composite-dentin rods of (1 mm x 1 mm x8mm) to measure the micro tensile bond strength using a universal testing machine. Results: preheating of adhesives significantly increases the micro tensile bond strength of composite resin to dentin. No significant difference of micro tensile bond strength between wet and dry bond techniques in both the preheated and the non-preheated groups was found. Conclusion: preheating adhesive is a significant factor affecting the bond strength compared to non-preheated one and the bond strength of the tested universal adhesive was not affected by dentin humidity

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Advanced Dental Journal
Volume 7, Issue 3
July 2025
Pages 365-374

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