Effect of long-term use of a soft lining material on edentulous mandibular ridge

由于很少有临床试验进行永久性软质义齿衬套，临床医生没有足够的证据证明其使用。本研究的目的是探讨永久性软衬材料在临床应用的效果。28名到访日本大学附属牙科医院牙科学院，符合选择标准并接受知情同意的无牙患者入选本试验。研究设计为两期交叉随机临床试验。干预措施为上颌和下颌骨常规义齿治疗，上颌常规义齿和下颌骨软衬义齿治疗。采用分层内随机排列块法将受试者分为两组。一组采用双颌常规义齿，其次为上颌骨常规义齿和下颌骨软衬义齿；另一组采用两套义齿，顺序相反。结果为咀嚼功能、义齿调整次数、义齿视觉模拟量表满意度和义齿选择偏好。实验结果如下：1.实验结果表明：软衬义齿调整完成后2、3个月咀嚼功能明显提高。2. 使用软衬义齿的调整次数显著增加。3. 满意度评分显示常规义齿与软衬义齿无显著差异。4. 72%的受试者选择软衬义齿。试验2本研究的目的是阐明在类似的研究设计下，使用软质义齿衬垫材料是否会影响全口义齿佩戴者的咀嚼性能。采用分层块随机分配法将10名受试者分为两期交叉设计组，其中一组在常规义齿后配戴软质义齿衬材料，另一组在常规义齿后配戴软质义齿衬材料，然后进行咀嚼性能评估。比较两种假体的咀嚼功能、咀嚼价值、咀嚼运动时的咀嚼肌肌电图、咀嚼运动时最大自主握紧时的咀嚼肌肌电图和咀嚼运动时下切点的运动情况。结果表明：软衬义齿与常规义齿相比，早期咀嚼运动时下切点的咬合相时间明显增加；然而，其他结果没有显示出显著差异。结论：基于这些随机对照试验的结果，软性义齿衬套应用于下颌全口义齿是一种有效的治疗方法。少

Trial 1Since few clinical trials have been carried out for permanent soft denture liner, clinicians have no sufficient evidence of their use. The purpose of this study is to investigate the efficacy of applying permanent soft lining materials in clinical setting. Twenty-eight edentulous patients who visited Nihon university school of dentistry at Matsudo affiliated dental hospital and have fulfilled selection criteria and accepted informed consent enrolled in this trial. Study design was randomized clinical trial with two-period cross-over. Intervention was conventional denture treatment for both maxilla and mandible in one arm, and conventional denture for maxilla and soft-lined denture for mandible in anther arm. A random permuted block within strata method was used for allocation of subjects into two groups. One group received conventional denture in both jaws followed by maxilla conventional denture and mandible soft-lined denture, and another received two sets of denture in contra … More ry order. Outcomes were masticatory performance, number of visit for denture adjustments, denture satisfaction with visual analog scale and preference of fabricated denture. The results were as follows: 1. Masticatory performance was significantly high soft-lined denture at two and three month after completing adjustment of denture. 2. Number of adjustments visits with soft-lined denture was significantly. 3. Satisfaction rating showed no significant differences between conventional and soft-lined denture. 4. Seventy-two percent of subjects selected soft-lined denture.Trial 2The purpose of this study is to clarify whether the use of soft denture liner material will affect the chewing performance of complete denture wearer under the similarly study design. The ten subjects have been allocated by stratified block randomized allocation method into two-period crossover designed groups, one has been arranged to wear soft denture liner material after the conventional denture, and another vice versa, then assessment of masticatory performance were carried out. Assessments of masticatory performance, masticatory value, EMG of masticatory muscle during chewing motion, EMG of masticatory muscle during maximum voluntary clenching and movement at the lower incisal point during chewing motion, were compared between the two prostheses. The results were as follows: soft lined denture showed significant increase against conventional denture in occluding phase time of movement at the lower incisal point during chewing motion in early period. However, other outcomes did not show significant differences. Conclusion: Based on the results of these randomized controlled trials, applying a soft denture liner to a mandibular complete denture is an effective treatment. Less