Introduction

Several studies have evaluated shear bond strength (SBS) of composite resin using different adhesive systems to primary and permanent dentin and demonstrated higher or lower bond strength to primary teeth compared to permanent teeth.^{1, 2}  Furthermore, dentin contamination by water, saliva, blood, eugenol-containing temporary filling materials, or pulpotomy agents, such as formocresol (FC), could have a detrimental effect on bond durability of composite resin and dentin bonding systems.^3-5

Zinc oxide-eugenol (ZOE) is one of the most commonly used temporary filling materials in endodontics and restorative dentistry.  Restorative materials containing ZOE have not been recommended as temporary fillings or cementing materials, liners, or bases under resin composite restorations due to their adverse effects on bond strength of resin-based restorative materials.^{3, 6, 7}  The lowered degree of conversion of resin composites cured in contact with ZOE cements has been found to lead to increased surface roughness, reduced microhardness, and reduced color stability.^{6, 8}   Pulpotomy agents, such as FC, could also have a detrimental effect on bond durability of composite resin and dentin bonding systems.  FC delivered by paper points to the root canals of human teeth crystallize both on dentin walls and inside dentinal tubules9 and may influence the bond strength values in permanent teeth.^{4, 10, 11}

It is crucial to study and determine the effect of surface contamination with the different materials used in dentistry for children on the bond strength of dentin bonding agents to primary teeth.  Therefore, the purpose of this in vitro study was to evaluate the influence of a temporary filling (ZOE) and two pulpotomy agents {(FC and ferric sulfate (FS)} on SBS of two dentin adhesives to the dentin of primary molars.

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Citation Number: Vol. 6, No. 3, Page 015