The Effect of Polishing Techniques on Surface Hardness of De-flex Denture Base

Abstract

Abstract Background: As usual "Poly methyl methacrylate (PMMA)" resin was stilled the greatest material used for denture foundations despite their identified disadvantage. Attempts to overwhelm these difficulties were advanced through the introduction of new denture base materials counting the injection-moulded thermoplastic resins. Aim: To assess and compare the surface hardness of thermoplastic resin material before and after different treatments. Material and Methods: Whole of 40 circular specimens of dimensions (30 mm × 2 mm- diameter and thickness respectively) divided into four group according to the surface treatment. Each group of material have (10) specimens. The first group was polished with pumice, the second group was polished with pumice and then glazed, the third group was polished with burning investment and then glaze and the fourth group was finished and glazed without adding any polishing material. Digital surface hardness tester meter Shore (D) device was used for indicating the value rigidity of specimens after surface polishing treatment. Results: After comparing the results, In General, there were significance difference among the control and experimental groups (P ≤ 0.05). Conclusions: - The mean values of the surface rigidity test were decreased in the control groups of De-flex material, while the surface hardness test was increased in the experimental groups after polishing with Glaze material.