Journal of Conservative Dentistry
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Year : 2003  |  Volume : 6  |  Issue : 3  |  Page : 93-98

Effects Of Collagen Removal On Smear Bond Strength Of Two Single Bottle Adhesive Systems



Correspondence Address:
Deepak Punhani


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Source of Support: None, Conflict of Interest: None


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Bonding to dentin relies on the penetration of adhesive into the collagen fibers (polypeptides) and encapsulation of the irregular hydroxyapatite crystals at the bottom of the decalcified area, to create the resin-reinforced interdiffusion zone called the “hybrid layer”. Concerns have been raised that dentin bonding agents do not fully diffuse through the collagen network that remains after acid conditioning of dentin. This unprotected collagen may potentially be a weak physical link in the long term adhesion of dentin to resin. Hydrolysis of these bands of exposed collagen not protected by resin (non-hybridized collagen) would occur with long term exposure to water. This could lead to deterioration of the adhesion between resin and dentin, resulting in decreased bond strength. So the purpose of the present study was to investigate the effect of collagen removal using sodium hypochlorite (NaOCl) following acid conditioning of the dentin on the shear bond strength of two single bottle adhesive systems, an acetone based (Prime & Bond NT) and ethanol/water based (3M Single bond).


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