新しい熱可塑性根管充塡材料の開発

―ジェルトンとワックスの混合物の熱可塑性―

抄録

Abstract : The purpose of this study was to investigate the thermoplasticity of raw materials for formulation a new root canal filling material with a comparatively low softening temperature, suitable fluidity and setting characteristics.

 The relationships between the properties and composition of the mixture constituted by the raw guttapercha-like materials (Jelutong), bee’s wax, and Japan wax were investigated using X-ray diffractometry, differential scanning calorimetry, and viscosity measurement of the mixture.

 The transition temperature of the wax components lowered about 10°C by the addition of Jelutong. The extent of phase transition of the mixture was related to the mixing ratio between Bee’s wax and Japan wax. The viscosity of the mixture varied with the composition depending upon both the inherent viscosity of each component and the change in the transition temperature.

 It was suggested from this study that the thermoplasticity of the mixture consisting of a waxy component was related to the transition temperature, viscosity and mutual compatibility of the components.