Abstract
Various comparisons and evaluations were made for 54 matched pairs of restorations treated with an acetone solution of a surface-active comonomer or an acetone solution alone. The clinical effectiveness of a tooth-restoration coupling agent (NPG-GMA) was tested by treatment of 54 Class III and V cavity preparations with an acetone solution of this surface-active comonomer. Fifty-four additional preparations were treated with acetone alone for comparison. The teeth were restored with an experimental composite material. The restorations were observed by three dentists for 3½ years. The evaluations indicated that the restorations placed over the NPG-GMA coupling agent had significantly better margins, and a significantly higher number of the NPG-GMA associated restorations were rated better compared to those placed over the acetone control.
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