Preparation, water absorption and solubility of a new Eucommia ulmoides gum composite soft denture liner / 中国组织工程研究

ABSTRACT

BACKGROUND: The most common soft liners currently used in the clinic are silicone rubbers and acrylics, but both of them have deficiencies. Therefore, the development of soft lining materials with stability, excellent performance, and antibacterial properties is of important clinical significance. OBJECTIVE: To prepare a soft lining material with high elasticity on the basis of excellent characteristics of Eucommia ulmoides gum, and to preliminarily explore its water absorption and solubility. METHODS: The basic formula was made based on the existing formula of elastic Eucommia ulmoides gum and medical rubber, in combination with the specific requirements of denture lining materials. The ratio of Eucommia ulmoides to butadiene rubber was set to be 1090, 3070, 5050, 7030 and 9010, and the new Eucommia ulmoides gum composite soft denture liners were then prepared. Acrylate self-curing soft lining material and Silagum silicone rubber denture soft lining material served as controls. Afterwards, the samples were put into distilled water or artificial saliva for 7 and 30 days, and the value of water absorption and water solubility were calculated. RESULTS AND CONCLUSION: (1) In the artificial saliva for 7 and 30 days, the water absorption rate and solubility of samples in different ratio groups were close to those in the Silagum group, but extremely lower than those in the acrylate group. (2) In the distilled water for 7 and 30 days, the water absorption rate and solubility of samples in different ratio groups were close to those in the Silagum group, but extremely lower than those in the acrylate group. (3) The water absorption rate and solubility of the acrylate group were significantly higher than those in the other groups at 7 and 30 days of immersion in the artificial saliva or distilled water (P < 0.05). (4) After 7 and 30 days of immersion, the water absorption rate of the same sample in the artificial saliva was significantly lower than that in the distilled water. Wile at 7 days of immersion, the samples in the 3070 and 5050 groups showed a lower solubility in the artificial saliva than in the distilled water (P < 0.05), and at 30 days of immersion, the samples in the 3070, 5050, 7030 and 9010 groups showed a lower solubility in the artificial saliva than in the distilled water (P < 0.05). (5) In the artificial saliva, there was no significant difference in the solubility in the 5050 and 7030 groups at 7 and 30 days of immersion (P> 0.05), while the solubility in the other groups exhibited significant differences at different observational times (P < 0.05). In the distilled water, there was no significant difference in the solubility in the 1090 and 3070 groups at 7 and 30 days of immersion (P> 0.05), while the solubility in the other groups exhibited significant differences at different observational times (P < 0.05). To conclude, the water absorption of Eucommia ulmoides gum composite soft denture liner is close to Silagum, but significantly less than that of acrylate soft lining materials, and the solubility remains at a very low level.