Journal of Conservative Dentistry
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Year : 2007  |  Volume : 10  |  Issue : 2  |  Page : 64-73

Invitro evaluation of the effect of sodium hypochlorite on shear bond strength of dentin bonding agent on demineralized and remineralized dentin

Department of Conservative Dentistry and Endodontics, J.S.S Dental College and Hospital, Mysore -570015, India

Correspondence Address:
M Vinutha
Department of Conservative Dentistry and Endodontics, J.S.S Dental College and Hospital, Mysore -570015
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-0707.42296

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Background & Objectives Formation of hybrid layer is thought to be the main mode of adhesion between dentin and resin. But, the longetivity of this hybrid layer is questionable as it is subjected to hydrolytic degradation over time. Hence, the concept of reverse hybrid layer on application of NaOCI is contemplated to bring about better bonding. Studies till date, have focused on the effects of NaOCI on sound tooth structure. Hence, this comparative study evaluated the effect of NaOCI on shear bond strength of two fifth generation single bottle adhesive agents on demineralized and remineralized dentin surfaces. Method 88 humans premolars were taken and divided into two main groups (group 1 and 2) and bonded with two fifth generation bonding agents Adper Single Bond 2 and Excite respectively.. Each of these groups were further divided into three subgroups Control, Demineralizing and reminerlizing group. The specimens in each subgroups were subjected to either acid etching alone or acid etching and NaOCI pretreatment. The teeth were then stored in distilled water for I month and subjected to shear bond testing. Stereomicroscopic evaluation of the fracture mode at debonded interfaces was done. SEM was used to evaluate the resin-dentin interface. Result No statistically significant difference existed between the two bonding agents (group I and 2) when the three subgroups were compared either without or with NaOCI application. A statistical significant difference existed for each of the bonding agents between the demineralized and remineralized subgroups. The subgroups subjected to NaOCI pretreatment showed better bond strength values, though statistically not significant. Interpretation and conclusion Bond strength values to demineralized dentin surface was higher than remineralized dentin surface both without and with NaOCI application. Sodium hypochlorite is an effective deproteinizing agent and its application results in the formation of a Reverse Hybrid Layer. This formed a more stable interface and would delay the process of hydrolytic degradation overtime.

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