Abstract
The effect of some dentine surface pretreatments proposed in the literature to enhance the bond strengths of one or more polycarboxylic acid cements, has been examined. Few of these pretreatments have been independently investigated. The bond strengths of two polycarboxylic acid cements, one of which contained SnF 2 , and a glass-ionomer cement were determined in tension by detaching 3 mm diameter stainless steel pads cemented to tooth surfaces and compacted synthetic hydroxyapatite. The bond strengths of the unfluoridated polycarboxylate cement were inferior to those of the SnF 2 containing cement. By exchanging liquids the major cause was found to be the old, highly viscous liquid of the unfluoridated cement. A significant increase in bond strength was obtained with the unfluoridated polycarboxylate cement following pretreatment of dentine with Ca(OH) 2 , or a mineralising agent or in situ precipitation of Ca 3 (PO 4 ) 2 . Similar increases were obtained with the polycarboxylate cement containing SnF 2 , which in addition showed improvement after in situ precipitation of Sn 3 (PO 4 ) 2 . No worthwhile improvement in bond strength of glass-ionomer cement to dentine was obtained with any pretreatment. Cohesive fracture of a weak layer of cement in contact with dentine may have masked any improvements in bond strength. Some general characteristics of successful dentine pretreatment agents are summarised.
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