Analysis of Viscoelastic Properties and Clinical Examination of Direct Soft Lining Materials for Denture Bases

研究了6种市售义齿基托软衬材料中与义齿基托适合性有关的未固化材料的流动性、与耐久性有关的吸水率以及与应力松弛效应有关的粘弹性。另外，对三种典型修复材料修复的义齿在体内的插入感觉、咀嚼能力、疼痛软化效果和耐久性进行了检测，并与上述体外实验结果进行了比较。以低温凝胶型CS和热固化型CS为丙烯酸树脂体系，以自固型NS和热固化型MB为有机硅树脂体系，以KD为氟树脂体系，以MS为聚烯烃体系。临床研究中使用了CS、KD和M(聚烯烃体系)，其流动性因材料的性质而异。CS、CS、NS和KD分别具有适合复涂的流动性。MB和MS的…更具弹性与其他材料相比，IC更多，流动性更小。看来，在试验结束期间，他们应该被压迫足够长的时间才能获得良好的体能。然而，在临床检查中，90%的患者认识到插入感觉的改善，如果仔细考虑，M的低流动性并不是一个麻烦，吸水率清楚地反映了材料的性能。21周后，CS组、NS组、CS组和KD组的吸水率分别为112、83、65和49µg/mm~3。然而，MB和MS在21周后几乎没有吸收水分。这些结果影响了这些材料的临床评价。CS和M的体内存活期约为13个月，KD的存活期较长。高耐水性M的耐久性低的原因是与义齿基托树脂的粘附性差，易被油性食物污染，粘弹性因材料差异大而无法在相同的测量条件下进行测量。4种材料(CS、NS、MB和MS)的黏度较小，弹性相对较高，但软衬材料应具有与残存牙槽沟粗糙膜相同的足够粘弹性。然而，在临床研究中，从对患者的访谈结果中很难看出三种材料在软化疼痛效果上的差异。较少

The fluidity of uncured material related to the fitness of denture base, the water absorption related to the durability and the viscoelastic properties related to the stress relaxation effect with relining for six commercial soft lining materials for denture bases were investigated. In addition, the insertion feeling, the masticatory ability, the softening effect of pain and the durability were examined in vivo using dentures relined with three typical relining materials and compared with the results in vitro as described above. The low temperature gelation type CS and the heat-curing type CSS as the acrylic resin system, the self-curing type NS and the heat-curing type MB as the silicone resin system, KD as the fluoro resin system and MS as polyolefine system were tested. CSS, KD and M (polyolefine system) were used for clinical study.The fluidity varied with the properties of the materials. CS, CSS, NS and KD had suitable fluidity for relining, respectively. MB and MS were more elast … More ic than the other materials and had less flow. It seemed that they should be pressed for a sufficiently long time during a trial closure to gain the good fitness. In clinical examination, however, 90% of patients recognized the improvement of insertion feeling so that the low fluidity of M was not a troubler if gave careful consideration.Water absorption reflected clearly the properties of the materials. After 21 weeks, amount of water absorption was 112mu g/mm^3 for CS, 83mu g/mm^3 for NS, 65mu g/mm^3 for CSS and 49mu g/mm^3 for KD. However, MB and MS absorbed almost no water after 21 weeks. These results influenced the clinical evaluation of these materials. The durability in vivo was about 13 month for CSS and M, and expected the longer period for KD. The reasons of the low durability of M with high water resistance were because its adhesion to denture base resin was poor and it was stained by the oiliness food.The viscoelastic properties varied so greatly with materials that they could not be measured under the same measuring condition. Four materials(CSS,NS,MB and MS) had less viscosity and relatively higher elasticity, although the soft lining materials should had an adequate viscoelasticity as same as that of the raucous membrane of residual ridge. In clinical study, however, It was difficult to make clear the difference of softening effect of pain for 3 materials from the results of interview to patients. Less