The effect of microwave processing and use of antimicrobial agent on porosity of conventional heat cured denture base resin: An in vitro study

Abstract

Statement of Problem:The occurrence porosity in polymethyl methacrylate, the most commonly used denture base material is a problem. The occurrence of oral candidiasis and other infections has also been reported in denture users.Purpose:The aim of this study was to evaluate the effect of addition of an antimicrobial agent, silver zeolite on the porosity of denture base resin, which will be an effective tool in the prevention of oral candidiasis among denture wearers. This study also aims to analyze the effect of polymerization technique on porosity in zeolite incorporated dentures to develop a denture base resin which will be easy to process with optimal mechanical and antimicrobial properties.Materials and Methods:Eighty rectangular resin specimens (65 mm × 40 mm × 5 mm) were divided into one control group (A) and three experimental groups (B – Microwave cured denture base resin specimens, C – Conventionally cured denture base resin incorporated with antibacterial zeolites, D – Microwave cured denture base resin incorporated with antibacterial zeolites) porosity was calculated by measurement of the specimen volume before and after its immersion in water. Data were analyzed using one-way analysis of variance.Results:The mean values of the percent mean porosity were: A = 0.9555%, B = 0.9590%, C = 0.9630%, D = 0.9695%. No significant differences were found in mean porosity among the groups evaluated.Conclusion:Within the limitations of this study, it could be concluded that the addition of zeolites did not result in significant porosity and that the use of microwave processing is a viable option for denture processing.

Comparison of the flexural strength of polymethyl methacrylate resin reinforced with multiwalled carbon nanotubes and processed by conventional water bath technique and microwave polymerization

“…A specially designed mold was used for the fabrication of the specimens [ Figure 2 ]. [ 22 ] The mold was lubricated with petroleum jelly to facilitate easy removal of the wax specimens. The lower and the middle plates of the mold were assembled together, and the modeling wax (DPI, Mumbai, India) was melted and poured into the mold.…”

Effect of Incorporation of Silver Nano-Particles on the Repairability of Conventional and Microwave Denture Bases

“…The mean values and standard deviation (SD) of flexure strength test results for both repaired Microwave and Conventional denture base material groups as function of repair surface designs and repair materials are summarized in table (4) and graphically drawn in figure (2).…”

“…(18 samples). (2) show materials and devices used throughout the study Intact samples were fractured and prepared for repairing with different design (Dovetail, Bevel, Butt design 90 degree). : Different repair site design used in the study were described in table (3) Two repair materials were used to repair fractured samples with different designs: a) Self-cure acrylic resin.…”

“…Other processing techniques used are microwave energy or light curing. (2) Although the conventional method has been considered as the best means of processing heat-cured denture resins, it takes relatively long time to cure the material, and also it is not a very clean procedure. The processing of denture with microwave is quite cleaner, less time taking, homogeneous mix of the material with excellent adaptation, and less residual monomer.…”

Poly(methylmethacrylate) Microwave Processing: A Technique Paper

“…Therefore, it is imperative to choose a resin with proven flexural strength as well compatibility with the microwave technique. Other literature demonstrates the microwave technique shows no statistical difference in postprocessing porosity or tooth movement compared to other conventional techniques …”