緩圧性を有する人工歯応用義歯支台の変位分析 : 食片形態の違いによる支台歯の変位特性
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概要
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This pilot study aims at inquiring into Tokumaru's investigation on the abutment tooth movements of the denture with the resilient dental teeth more closely. Various shaped test food were placed on the dental tooth and/or teeth of the unilateral mandibular distal extension removable partial dentures without soft liner (design Ct), ones with resilient silicone layer under the basal seat of dental teeth (design E), and ones with ordinal soft liner over the denture base (design R) which were made on the simulation model of Kennedy class II missing of the right second premolar, first and second molars. And the movements of the abutment tooth (〓) in each design denture when crushing respective shaped test food were measured by using digital laser displacement sensors and the measured values were reciprocally compared through the statistical analysis. The results obtained were as follows : 1. Comparison of the abutment tooth movements of each designed denture : 1) The inclination of the abutment tooth when crushing various shaped test food was the largest of all in design R3 significantly (p<0.001). And there was a significant difference (p<0.05) between those of E3 and Ct while the load was relatively small and the former showed small inclination, but no significance was found between those of E3 and Ct when the load increased. 2) Twist like movement on design E3 was also the smallest of all designs, and Ct and R3 in order. And high significance was detected between those of E3 and Ct, and between Ct and R3, and the most high significance was recognized between those of E3 and R3. 3) Although the depression in Ct showed a extreme variation by crushing various shaped food, that of E3 was not affected very much and exhibited almost constant one, and the smallest depression and the largest one were observed in E3 and in Ct respectively. 4) The parallel movement was the largest of all in design R3 significantly (p<0.001). However, there was no significant diference between those of E3 and Ct while the load was relatively small in contrast with the inclination, but as the load increased, a significant difference between both designs gradually appeared showing larger parallel movement in E3 than that of Ct (p<0.05). 2. Depending on the type of food shape, considerably large difference was recognized in abutment tooth behaviours. Especially food type-b induced larger inclination and depression in the abutment tooth. This fact seems to suggest the neccesity of reexamination on the occlusal treatment of the fixed and removable prostheses which sometimes puts into practice as one of the clinical techniques now. 3. In buccolingual displacement of the denture base, that of R3 was significantly larger than those of E3 and Ct respectively (p<0.01, p<0.05), and that of E3 had a tendency to be smaller than that of Ct, although there was no significant difference between those of E3 and Ct. On the basis of the foregoing findings, the resilient dental tooth has some problems for the complete assembly. However, surely this dental tooth will be one of the excellent component of removable partial dentuters by the above facts that were able to minimize the inclination and the twist like movement of the abutment tooth.
- 九州歯科学会の論文
- 1999-10-25