Viscoelastic Properties and Durability of Photo-activated Soft Lining Materials for Denture Base

义齿基托光激活软衬材料的粘弹性和耐久性

• 批准号: 09671998
• 负责人: FUJII Koichi
• 金额: $ 2.11万
• 依托单位: Kagoshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09671998/
• 关键词: Soft lining material; Viscoelastic property; Surface roughness; Denture base cleanser; Light reflectivity; Contact angle; Durometer hardness; Weight change; 軟性裏材料; 表面あらさ

1. On study plan in 1997. Pour commercial soft lining materials (CMs : CS, LN, SL, TS) were stored in each solution (DW : distiied water ; SC : isotonic sodium-chloride solution (0.9%) ; AS : artificial saliva) for 8 weeks at 37"*"C, with cleaning by using seven denture base cleansers in accordance with manufacture's instruction. And viscoelastic property and degradation of four CMs were investigated. The results obtained were as follows.(1) Before immersion the hardness(Hex) of the CMs ranged from 21.1 to 44.7 and these values increased up to 104.6-132.7% after storage in each solution for 2 weeks.(2) Before immersion the light reflectivity of the CMs ranged from 20 (none glossy surface to 70 (high glossy surface). The values of the CM (GS) were apt to decrease with increasing storage period and however the values of other CMs (LN, SL, TS) showed insignificant change.(3) Before immersion the contact angle of the CMs ranged from 35 to 40"*". After I day of storing in the DW and SC.the … More values of two CMs (CS, SL) were slightly lower than those before immersion. However, the values of all CMs showed insignificant change between 3 days and 8 weeks stored in each solution.(4) Before immersion the surface roughness of the CMs ranged from about 2' to 8 mum. These values increased with increasing storage period.(5) Many hollows on the specimen surface of three CMs (CS, LN, TS) were observed within 3-7 days from start of immersion.2. On study plan in 1998. On the basis of the data obtained in 1997. the nine experimental photo-activated soft lining materials (EPMs) were produced, which the powder as a main component was polyethylmethacrylate (PEMA) and the liquid consists of di-n-butyl phthalate (DBP) as plasticizer, ethylmethacrylate (EMA), photo-sensitizer, reducing agent and ethanol(Et), and the powder-to-liquid ratio was 1.38. in this study, four EPMs (M1D8E0, M1DSE0.5, M1D8E1, M1D8E1.5), which the hardness valus were almost equal to those of the CMs, were selected out among the nine EPMs. A formation of the liquid with four EPMs was EMA : DBP in the ratio 1 : 8 and Et added within 0-14.3wt%. Measurements were performed by means of the same as that described for the CMs. Although no conclusion has been reached because the change of viscoelastic property with the EPMs is now being continued, the results obtained till now are as follows. Namely it could be seen that the EPMs (MID8E0, M1D8E0.5) with lower percentage of Et exhibited an excellent durability Less

1. 1997年学习计划。将市售软衬材料（CM：CS、LN、SL、TS）在37 ℃下储存在每种溶液（DW：蒸馏水; SC：等渗氯化钠溶液（0.9%）; AS：人工唾液）中8周，根据制造商的说明书使用7种义齿基托清洁剂进行清洁。研究了四种CM的粘弹性能和降解性能。获得的结果如下。(1)浸泡前，CM的硬度（Hex）范围为21.1至44.7，在每种溶液中储存2周后，这些值增加至104.6-132.7%。(2)在浸没之前，CM的光反射率在20（无光泽表面）至70（高光泽表面）的范围内。随着贮藏时间的延长，CM（GS）值趋于下降，而其它CM（LN、SL、TS）值变化不显著。(3)在浸没之前，CM的接触角范围为35至40”*"。在DW和SC中储存一天后， ...更多信息 两种CM值（CS、SL）均略低于浸泡前。然而，在每种溶液中储存3天和8周之间，所有CM的值均显示无显著变化。(4)在浸没之前，CM的表面粗糙度范围为约2 μ m至8 μ m。这些值随着储存期的增加而增加。(5)三种CM（CS，LN，TS）在浸泡后3-7天内，试样表面出现大量空洞. 1998年学习计划。根据1997年获得的数据。制备了9种以聚甲基丙烯酸乙酯（PEMA）为主要成分的光活化软衬材料（EPM），以邻苯二甲酸二丁酯（DBP）为增塑剂、甲基丙烯酸乙酯（EMA）、光敏剂、还原剂和乙醇（Et）为液体，粉液比为1.38。本研究从9种电永磁材料中筛选出4种硬度值与CM相近的电永磁材料（M1 D8 E0、M1DSE0.5、M1 D8 E1、M1D8E1.5）。具有四种EPM的液体的形成是比率为1：8的EMA：DBP和在0- 14.3wt%内添加的Et。通过与CM所述相同的方法进行测量。虽然由于电子探针粘弹性能的变化仍在继续，尚未得出任何结论，但迄今为止获得的结果如下。即，可以看出，具有较低百分比Et的EPM（MID 8 E0，M1D8E0.5）表现出优异的耐久性。