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

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 fourgroup according to the surface treatment. Each group ofmaterial have (10) specimens. The first group was polishedwith pumice, the second group was polished with pumice andthen glazed, the third group was polished with burninginvestment and then glaze and the fourth group was finishedand glazed without adding any polishing material. Digitalsurface hardness tester meter Shore (D) device was used forindicating the value rigidity of specimens after surfacepolishing treatment. Results: After comparing the results, InGeneral, there were significance difference among the controland experimental groups (P ≤ 0.05). Conclusions: - The meanvalues of the surface rigidity test were decreased in thecontrol groups of De-flex material, while the surface hardnesstest was increased in the experimental groups after polishingwith Glaze material.