Hideshima M
The 1st Department of Prosthetic Dentistry, Kanagawa Dental College.
Kanagawa Shigaku. 1990 Jun;25(1):58-76.
From both vital and denture sides, the design of denture in dental clinic needs taking care of various viewpoints; alleviation of the adverse effect on the periodontium is necessary on the vital side, and prevention of possible rupture of the denture at its functioning and taking hygienic measures are necessary on the denture side. Utilization of the metal and adhesive, 4-META containing resin (hereinafter referred to as adhesive resin) in the design of denture has been reported to be not only hygienically advantageous because of difficult adhesiveness of bacterial flora due to solid union between the metal and the resin, but also less in danger of the denture rupture from its finishing line portion. However, a few reports have been made on the analysis of the correlation between the mechanical strength of the whole of denture and the use of adhesive resin and on the deformation of the metallic frame due to curing shrinkage of adhesive resin. In the present study, in terms of these problems, utilizing the modal analysis applying a vibrato-logical technique and the strain gauge device appropriate for the determination of the time-course, samples of chrome-cobalt alloy and of partial denture were examined for the influence of inserted adhesive and non-adhesive resins upon them. The following results were obtained: 1. The results of the determination by the strain gauge method revealed that the insertion of adhesive resin tended to have more displacement volume for more insertion volume and for thinner chrome-cobalt alloy sample and that of non-adhesive resin had practically no adhesive force, suggesting a small deformation of the sample due to curing shrinkage, with little interlocking force. 2. The results of modal analysis revealed that the insertion of the adhesive resin onto the denture sample led to an increase in mechanical strength and a rigid body modality of the activity at the finishing line portion compared with the non-adhesive resin. 3. From the results of the determination by the strain gauge method and of the modal analysis, the application of adhesive resin was suggested to increase the intensity of denture.
从天然牙侧和义齿侧来看，牙科诊所中义齿的设计需要考虑多个方面；在天然牙侧，减轻对牙周组织的不良影响是必要的，而在义齿侧，防止义齿在功能行使时可能出现的破裂以及采取卫生措施是必要的。据报道，在义齿设计中使用金属和含4 - META的粘结树脂（以下简称粘结树脂），不仅因为金属与树脂之间的牢固结合使细菌菌群难以附着而具有卫生优势，而且从义齿的边缘部分来看，义齿破裂的风险也较小。然而，关于义齿整体机械强度与粘结树脂使用之间的相关性分析以及粘结树脂固化收缩导致金属框架变形的报道较少。在本研究中，针对这些问题，利用应用振动逻辑技术的模态分析和适合测定时间进程的应变片装置，研究了铬钴合金样本和局部义齿样本在插入粘结树脂和非粘结树脂时所受的影响。得到了以下结果：1. 应变片法测定的结果表明，粘结树脂的插入量越多、铬钴合金样本越薄，位移量往往越大，而非粘结树脂实际上没有粘合力，这表明样本因固化收缩而变形较小，联锁力也较小。2. 模态分析的结果表明，与非粘结树脂相比，在义齿样本上插入粘结树脂会导致机械强度增加，并且在边缘部分的活动刚体模态增加。3. 根据应变片法测定结果和模态分析结果，建议使用粘结树脂可提高义齿的强度。
