Aboush Y E, Jenkins C B
Department of Conservative Dentistry, Bristol Dental Hospital and School.
Br Dent J. 1991 Sep 21;171(6):166-9. doi: 10.1038/sj.bdj.4807638.
Although resin-bonded bridges should ideally be bonded to enamel, abutment teeth may present with dentine or restorations at the bonding sites. This study assessed the influence of bonding to such adherends on bridge retention by using tensile bond strength measurements as the criteria for judgement. An adhesive resin cement (Panavia Ex) was bonded to single adherends of enamel, dentine, composite resin, glass ionomer or amalgam, and to combined adherends of enamel/dentine or enamel/restorative material. The bond strength to enamel (28 MPa) was comparable with that to composite resin (25 MPa), but significantly higher than to dentine (8 MPa), amalgam (8 MPa) and glass ionomer (13 MPa). When the bonding area was half enamel and half restorative material, the bond strength was only equivalent to that obtained when the entire bonding area consisted of restorative material, the less favourable adherend. A similar trend was observed with specimens of enamel/dentine. This indicated that the magnitude of the bond between the resin cement and combined adherends was limited by the strength of the bond to the less favourable adherend. It appears that extending a bridge retainer to cover exposed dentine, a glass-ionomer filling or an amalgam filling, could adversely affect the bridge retention.
尽管理想情况下树脂粘结桥应粘结于牙釉质，但基牙在粘结部位可能存在牙本质或修复体。本研究通过使用拉伸粘结强度测量作为判断标准，评估了粘结于此类被粘物对桥体固位的影响。一种粘结性树脂水门汀（Panavia Ex）被粘结于牙釉质、牙本质、复合树脂、玻璃离子体或汞合金的单一被粘物上，以及牙釉质/牙本质或牙釉质/修复材料的组合被粘物上。与复合树脂（25MPa）的粘结强度相比，与牙釉质的粘结强度（28MPa）相当，但显著高于与牙本质（8MPa）、汞合金（8MPa）和玻璃离子体（13MPa）的粘结强度。当粘结面积为一半牙釉质和一半修复材料时，粘结强度仅相当于整个粘结面积均为修复材料（较不理想的被粘物）时所获得的粘结强度。在牙釉质/牙本质试件中观察到类似趋势。这表明树脂水门汀与组合被粘物之间的粘结强度大小受限于与较不理想被粘物的粘结强度。看来将桥体固位体延伸至覆盖暴露的牙本质、玻璃离子体充填物或汞合金充填物，可能会对桥体固位产生不利影响。
