総義歯装着者における軟性裏装材の機能的効果に関する研究

抄録

Functional effect of a resilient denture liner was determined in the complete denture prosthesis. Five complete denture wearers were used as subjects (average age 69.6 years). Experimental dentures were relined using resilient denture liner of two different thicknesses (1.4 mm and 2.8mm). Tapping movement was studied in order to quantify, in 3 dimensions, the functional effect using strong and light tapping. EMG was used to measure masticatory muscle activity.Results:1. Regardless of tapping strength, the thicker (2.8mm) liner tended to move the mandible anteriorly during tapPing.2. Tapping point instability and variation was more apparent with the thicker (2.8mm) liner, and light tapping showed greater lateral variation.3. Integrated muscle activity of the posterior temporal muscle was reduced and the masticatory muscle pattern was changed.4. Shock absorption at the mentum increased significantly in both liner thicknesses. However,there was no differentiation between the thicker and thinner liners.5. A correlation between the shock acceleration and the amount of the muscular activity was tended to decrease according to the thickness of the resilient liner.The above data showed that the resilient denture liner influences not only functional muscle activity, but also changes the tapping point stability and variation during tapping movement.