Department of Prosthodontics, Faculty oF Dentistry, Gazi University, Ankara, Turkey.
J Adhes Dent. 2011 Feb;13(1):85-92. doi: 10.3290/j.jad.a18241.
This study compared shear bond strength and type of bond failure between a highly cross-linked tooth and different denture base polymers.
Cross-linked denture teeth were bonded to either a heat-, an auto-, a microwave-polymerized denture base resin or a relatively new injection-molded, microwave-polymerizable polyurethane-based resin. Six experimental groups were established for each of the shear and peel tests. In four of the groups, teeth were used as received and bonded to each of the denture base resins; in the remaining two groups, they were treated with dichloromethane to determine its effect on the bonding with heat or auto-polymerized denture base resins. Bond strength was determined by compressive load applied at 45 degrees on the palatal surface of each tooth until fracture; the type of bond failure was assessed by the peel test.
The results showed that heat-cured PMMA groups failed cohesively and demonstrated significantly higher bond strengths than the other resins used. The application of dichloromethane on the ridge lap areas of teeth resulted in a significant improvement of bond strengths in heat- and auto-cured resins.
Within the limitations of this experimental study, the results suggest that type of denture base material and processing methods may have an influence upon the bond strength between interpenetrating polymer network (IPN) denture teeth and base materials. Treatment of denture teeth with dichloromethane could provide substantial improvement in the bond strength of teeth with heat and auto-cured denture base resins; however, this finding should be validated in further investigations on the long-term effect of such treatment on the bond strength.
本研究比较了高度交联牙与不同义齿基托聚合物之间的剪切粘结强度和粘结失败类型。
将交联义齿牙粘结到热固化、自固化、微波聚合义齿基托树脂或相对较新的注塑、微波可聚合的基于聚氨酯的树脂上。每个剪切和剥离试验都为每个实验分组建立了 6 个实验组。在其中 4 个组中，牙齿未经处理直接与每个义齿基托树脂粘结；在其余 2 个组中，用二氯甲烷处理，以确定其对热固化或自固化义齿基托树脂粘结的影响。粘结强度通过在每个牙的腭表面以 45 度角施加压缩载荷来确定，直至断裂；粘结失败的类型通过剥离试验评估。
结果表明，热固化 PMMA 组发生内聚性失效，粘结强度明显高于其他使用的树脂。在牙齿的脊区应用二氯甲烷，可显著提高热固化和自固化树脂的粘结强度。
在本实验研究的限制范围内，结果表明义齿基托材料的类型和加工方法可能会影响互穿聚合物网络（IPN）义齿牙与基托材料之间的粘结强度。用二氯甲烷处理义齿牙可显著提高热固化和自固化义齿基托树脂的牙粘结强度；然而，这种发现应在进一步研究这种处理对粘结强度的长期影响的研究中得到验证。
