Studies on the development of new soft resin-based denture for elderly person in need of care

我们开始开发新的软树脂基义齿，吸收义齿下粘膜的机械刺激，这对老年人来说是舒适的。首先特别选择了甲基丙烯酸2-乙基己酯（EHMA）和甲基丙烯酸甲酯（MMA）的共聚物，并通过初步的压缩试验表明该共聚物可能具有力学效应。其次，通过本研究设计的试验方法，对衬里用软质树脂所需的软质模量、松弛应力率和压缩后尺寸恢复率进行了研究。结果表明，当EHMA组成比超过80%时，柔软模量呈指数级增加。对于松弛应力率，在EHMA大于60%的范围内，显示出令人满意的值。对于尺寸恢复率，EHMA 60%和70%的共聚物表现出弹性恢复行为，而EHMA 80%、90%和100%的共聚物表现出粘弹性恢复行为。然而，共聚 关于我们 大于EHMA 80%的rs表明30秒后尺寸恢复率约为100%。因此，我们判断这种延迟在临床上没有问题。通过这种方式，EHMA效应得到了确认。作为应用，制作上、下全口义齿进行试戴。方法如下。然后，将EHMA-MMA片材在70℃下加热制成牙槽嵴石膏模型。在义齿制作的最后阶段，将树脂面团填充到上固化烧瓶中后，将形成的EHMA-MMA片材应用于义齿的粘膜侧。将固化瓶固定在瓶托上，在70℃下聚合EHMA-MMA软基义齿。另外，丙烯酸树脂和EHMA-MMA片材之间的界面是化学键合的。因此，由于具有粘弹性的软树脂基义齿能够通过义齿分散和放松咀嚼力，因此非常期望患者能够避免粘膜疼痛。少

We began development of new soft resin-based denture absorbing mechanical stimulation to a mucous membrane under denture, which was comfortable to an elderly person. First a copolymer of 2-ethylhexyl methacrylate (EHMA) and methyl methacrylate (MMA) was selected especially, and it was suggested that the copolymer might have a mechanical effect by preliminary compression tests. Secondly, modulus of softness, relaxation stress rate and ratio of dimensional recovery after compression to be necessary for soft resin for lining were investigated by test method devised in this study. As a result, the modulus of softness exponentially increased when the EHMA composition ratio exceeded 80%. As for the relaxation stress rate, a satisfied value was shown in range of more than EHMA 60%. As for the ratio of dimensional recovery, copolymers of EHMA 60% and 70% showed behavior of elastic recovery, whereas copolymers of EHMA 80%, 90% and 100% showed behavior of viscoelastic recovery. However, copolyme … More rs of more than EHMA 80% showed the ratio of dimensional recovery of about 100% after 30 second. Therefore, we judged that such the delay was clinically no problem. In this manner, the EHMA effect was recognized. As application, upper and lower complete denture was made for trial. The method is as follows. Beforehand, EHMA-MMA sheet was adapted to plaster model of an alveolar ridge by heating at 70℃. After packed resin dough to upper curing flask at final stage of denture method, the formed EHMA-MMA sheet was applied to mucous membrane side of denture. And the curing flask was set to flask retainer, and the EHMA-MMA soft resin-based denture was polymerized at 70℃. By the way, the interface between an acrylic resin and EHMA-MMA sheet were chemically bonded. Consequently, as the soft resin-based denture having viscoelastic property was able to disperse and relax a force of mastication through denture, It was expected very much that a patient might be able to evade a pain of mucous membrane. Less