Effect of Miniaturized Dumbbell-Shaped Specimen to Identify Bonding of Bovine Dentin

提出了一种可靠的牙本质粘接树脂的方法。该方法描述了通过浸渍和粘合单体的聚合使牙本质底物杂交，从而形成“杂交牙本质”或“杂交层”。通常，所应用的粘合剂单体不能完全渗透到酸条件下的基质中，并且在杂交牙本质和未改变的潜在矿化牙本质之间留下一个未浸渍树脂的脱矿化牙本质区域。脱矿牙本质的未填充区导致结合牙本质的缺陷。当[未填充区强度]×[面积]的量大于树脂或粘结强度时，很难检查混杂层底部缺陷的存在。因此，传统的拉伸粘结强度测量结果经常被误解。通过将样品浸泡在水中，通过水解来降低胶原蛋白的强度，研究了结合后牙本质中的缺陷。然而，要确定牙本质结合是否良好需要很长时间。这些结果促使我们开发一种方法来测量具有相同截面的试件在粘结区域的拉伸粘结强度。哑铃形牙本质粘结试样是一个很好的选择，因为哑铃形试样通常用于测量材料的抗拉强度。结果表明，用10%柠檬酸/3%氯化铁水溶液处理10秒后，粘结的牛牙本质会形成缺陷。在哑铃试样中观察到缺陷，而在转换试样中没有观察到缺陷。同样清楚的是，即使在常规测试中观察到树脂内聚失败，缺陷牙本质结合也不是很好。当粘接单体更充分地浸渍在脱矿牙本质的整个区域时，牙本质的粘接质量很好。我们将继续开发这样的粘接系统，通过使用哑铃样品来提供稳定的无缺陷粘接。少

A reliable method for bonding resin to dentin was proposed. The procedure described hybridization of dentin substrates by impregnation and polymerization of adhesive monomers therein, creating a 'hybridized dentin' or 'hybrid layer. Often, applied adhesive monomers do not fully penetrate the acid-conditioned substrate, and a zone of demineralized dentin that is not resin-impregnated is left sandwiched between the hybridized dentin and the unaltered underlying mineralized dentin. An unfilled zone of the demineralized dentin causes defects in bonded dentin. It was very difficult to examine the presence of the defect at the base of the hybrid layer was not understood when the amount of [strength of unfilled zone] x [the area] was larger than the resin or bond strength. Thus, the results of conventional tensile bond strength measurement have often been misinterpreted. The defects in the bonded dentin were investigated by soaking the specimens in water to decrease the strength of collagen b … More y the hydrolysis. However, it takes a long time to ascertain whether the dentin bond is excellent or not. These results persuaded us to develop a method to measure tensile bond strength on specimens which have the same cross-section at the bonded area. Dumbbell-shaped dentin bonded specimens must be a good candidate as dumbbell specimens are generally used to measure tensile strength of materials.It was reported that the defects in bonded bovine dentin were formed when the dentin was treated with an aqueous solution of 10% citric acid/3% ferric chloride for 10 sec. The defects were observed in using dumbbell specimens, but not in conversional specimens.It was also clear that defective dentin bond is not so good even when cohesive failure in resin was observed by the conventional test. When adhesive monomers more fully impregnated the entire region of demineralized dentin, the quality of the dentin bond was excellent. We will continue to develop such bonding systems to provide stable adhesion without defects by using dumbbell specimens. Less