Abstract
Purpose: The research investigated marketed hard resins for dental usage as to mechanical properties affected by dipping conditions, and as to glossiness provided by finishing materials. Three candidates: Esthenia, Conquest Thermocrystal, and Art Glass, went through the following tests, for that purpose.
Methods: 1. Dipping Test for Four Mechanical Properties: Compressive Strength, Tensile Strength, Bending Strength, and Vickers Hardness. Condition 1: Each candidate dipped in 37°C water for 24 hours. Condition 2: Dipped in 70°C water for one week. 2. Finishing Material Test for Glossiness. Employed Materials: A. Six kinds of waterproof polishing paper:# 150, 600, 1, 200, 2, 000, 4, 000, 8, 000. B. Silica powdered solution: 0.06μm fine.
Result: The data in Condition 1 were more ideal in each material property compared with Condition 2; Esthenia showed the highest result in each material property, of all the candidates. The test for glossiness indicated two noticeable orders of the candidates: a. Art Glass, Conquest Thermocrystal, and Esthenia, in descending order, qualified by the finishing materials # 150-2, 000. b. Esthenia, Conquest Thermocrystal, and Art Glass, by # 4, 000, 8, 000, and 0.06μm silica solution.
Conclusion: In conclusion, the research showed three results: All the resins showed higher material properties in 37°C water for 24 hours than in 70°C water for one week; Esthenia showed the highest measurement in the dipping test; and the finishing material test showed different glossiness ranks of Esthenia and Art Glass in # 2, 000 or lower and in # 4, 000 or higher of finishing materials.
