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

研究了6种商用义齿基托软衬材料未固化材料的流动性与基托适度的关系、吸水率与基托耐久性的关系、粘弹性与基托应力松弛效应的关系。此外，使用三种典型内衬材料的义齿在体内检测其插入感、咀嚼能力、疼痛软化效果和耐久性，并与体外结果进行比较。测试了低温胶凝型CS和热固化型CSS作为丙烯酸树脂体系，自固化型NS和热固化型MB作为有机硅树脂体系，KD作为氟树脂体系和MS作为聚烯烃体系。采用CSS、KD和M（聚烯烃体系）进行临床研究。流动性随材料性质的不同而变化。CS、CSS、NS和KD分别具有较好的复衬流动性。MB和MS比其他材料更持久，ic更多，流动性更少。在试闭期间，他们似乎应该被压制足够长的时间，以获得良好的体能。然而在临床检查中，90%的患者认识到插入感觉的改善，因此如果仔细考虑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的吸水量为112 μ g/mm^3， NS为83 μ g/mm^3， CSS为65 μ g/mm^3， KD为49 μ g/mm^3。21周后，MB和MS几乎不吸收水分。这些结果影响了这些材料的临床评价。CSS和M的体内持久性约为13个月，KD的体内持久性预计更长。高耐水性M材料耐久性低的原因是其与义齿基托树脂的粘结力差，并被油性食物所污染。不同材料的粘弹性变化很大，在相同的测量条件下无法测量。4种材料（CSS、NS、MB和MS）黏度较低，弹性相对较高，但软衬材料应与残脊沙哑膜具有足够的粘弹性。然而在临床研究中，很难从对患者的访谈结果中明确3种材料对疼痛的软化效果的差异。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