Resin Adhesion to the Primary Dentin Report 1

Abstract

The purpose of this study was to investigate the effects of various tooth surface conditioners, primers, liners and bonding agents on the resin adhesion to the primary dentin.
The labial surfaces of 9 extracted or exfoliated human primary anterior teeth and 74 extracted and frozen bovine mandibular primary incisors were used. Three adhesive treatment groups were prepared. The CA Liner Bond group (CA agent, SA Primer, Protect Liner: Kuraray Co. ), the 10-3 D Liner group (10-3solution, Superbond Primer, Superbond D Liner: Sunmedical Co. )and the phosphoric acid Photo Bond group (K etchant, Clearfil Photo Bond: Kuraray Co. ). The composite resin used in this study was Kuraray Co. Clearfil Photo Anterior (shade: A2). In the thermal cycled groups, thermal cycling tests consisting of water baths with 10,000 temparature cycles between 60°C and 4°C were attempted. The effects of tooth surface conditioners were observed in the SEM. The shear bond strength was tested and the test surfaces of the dentin and the resin specimens were observed in the SEM.
1. For the effects of the tooth surface conditioner, the 10-3 solution showed the highest efficacy, followed by the K etchant and CA agent. However, tooth to tooth difference greatly influenced the tooth surface conditioning efficacy.
2. In the non-thermal cycled groups, the bond strength of the phosphoric acid Photo Bond group(8.78±3.82 MPa)was significantly lower than those of the 10-3 D Liner group(30.67±7.38 MPa)and the CA Liner Bond group (29.92±5.70 MPa).
3. In the thermal cycled groups, the bond strength of the 10-3 D Liner group (25.99±6.41 MPa)was significantly higher than those of the CA Liner Bond group(14.31±6.33 MPa)and the phosphoric acid Photo Bond group(13.02±8.78 MPa).
4. In thc CA Liner Bond group, the bond strcngth of the thermal cyclcd group was significantly lower than that of the non-thermal cycled group.