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

提出了一种可靠的牙本质树脂粘接方法。该过程描述了通过在其中浸渍和聚合粘合剂单体来杂交牙本质基质，从而产生“杂交牙本质”或“杂交层”。通常，施加的粘合剂单体不会完全渗透酸处理的基底，并且未被树脂浸渍的脱矿牙本质区夹在杂交牙本质和未改变的下层矿化牙本质之间。脱矿牙本质的未填充区导致粘结牙本质的缺陷。当[未填充区域的强度] x [面积]的量大于树脂或粘结强度时，很难检查混合层底部是否存在缺陷。因此，传统的拉伸粘结强度测量的结果经常被误解。将牙本质标本浸泡于水中，以降低牙本质中胶原B的强度 关于我们 y水解。然而，它需要很长的时间来确定牙本质粘结是否良好。这些结果促使我们开发一种方法来测量拉伸粘结强度的试样，具有相同的横截面在粘结区。哑铃形牙本质粘接试件是一个很好的候选者，因为哑铃形试件通常用于测量材料的拉伸强度，据报道，牙本质粘接的缺陷是在10%柠檬酸/3%氯化铁水溶液处理牙本质10秒时形成的。哑铃型牙本质粘结试验中观察到了牙本质粘结的缺陷，而转换型牙本质粘结试验中未观察到牙本质粘结的缺陷，这表明即使在树脂粘结试验中观察到了牙本质粘结的破坏，牙本质粘结的缺陷也不是很好。当粘合剂单体更充分地浸渍整个脱矿牙本质区域时，牙本质粘结的质量是优异的。我们将继续开发这样的粘接系统，通过使用哑铃试样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