Effect of denture cleaning on abrasion resistance and surface topography of polymerized CAD CAM acrylic resin denture base

Abstract

BackgroundThe application of computer-aided design computer-aided manufacturing (CAD CAM) technology in the fabrication of complete dentures, offers numerous advantages as it provides optimum fit and eliminates polymerization shrinkage of the acrylic base. Additionally, the porosity and surface roughness of CAD CAM resins is less compared to conventionally processed resins which leads to a decrease in the adhesion of bacteria on the denture base, which is associated with many conditions including halitosis and aspiration pneumonia in elderly denture wearers.AimTo evaluate the influence of tooth brushing with dentifrices on CAD CAM resin blocks in terms of abrasion resistance, surface roughness and scanning electron photomicrography.MethodsThis experimental study was carried out at the Faculty of Dentistry of King Abdulaziz University during 2016. A total of 40 rectangular shaped polymerized CAD CAM resin samples were subjected to 40.000 and 60.000 brushing strokes under a 200-gram vertical load simulating three years of tooth brushing strokes using commercially available denture cleaning dentifrice. Data were analyzed by SPSS version 20, using descriptive statistics and ANOVA.ResultsANOVA test revealed a statistical significant weight loss of CAD CAM acrylic resin denture base specimens following 40.000 and 60.000 brushing strokes as well as a statistical significant change (p=0.0.5) in the surface roughness following brushing. The CAD CAM resin samples SEM baseline imaging revealed a relatively smooth homogenous surface, but following 40,000 and 60,000 brushing strokes, imaging displayed the presence of small scratches on the surface.ConclusionCAD CAM resin displayed a homogenous surface initially with low surface roughness that was significantly affected following simulating three years of manual brushing, but despite the significant weight loss, the findings are within the clinically acceptable limits.

Effect of Ozone on Corrosion Behavior of a Cobalt–Chromium Alloy Used in Removable Partial Denture Framework: An In Vitro Study

“…5 In addition, brushing the acrylic resin denture bases may increase the surface roughness, and consequently increase the formation and adhesion of the biofilm. 6…”

Evaluation of a glaze polishing technique for pigmented denture acrylic resin submitted to thermocycling and disinfection

“…In addition, contact to pigmented food, and the disinfection applied, can increase the amount of stress and induce further degradation characteristics. [2,3,17] The disinfection of complete prostheses can be performed with chlorhexidine gluconate, sodium hypochlorite, alkali, and peroxide solutions, as well as with microwave energy. [2,3,[17][18][19] Chlorhexidine gluconate and effervescent tablets are effective in the reduction of microorganisms, but can induce a surface degradation.…”

“…[2,3,17] The disinfection of complete prostheses can be performed with chlorhexidine gluconate, sodium hypochlorite, alkali, and peroxide solutions, as well as with microwave energy. [2,3,[17][18][19] Chlorhexidine gluconate and effervescent tablets are effective in the reduction of microorganisms, but can induce a surface degradation. [18] Microwave disinfection was proven effective against candida species, however, it was associated to color and hardness changes in acrylic resin.…”

“…[18] Microwave disinfection was proven effective against candida species, however, it was associated to color and hardness changes in acrylic resin. [2,3,17,19] Yet, microwave energy and effervescent tablets are the most accessible disinfection techniques with satisfactory microorganism reduction.…”

“…There are many reports in published literature correlating thermocycling and disinfectant solutions with different properties of acrylic resin. [1,3,8,12,17,[20][21][22] Yet, there are no known reports on the glaze polishing technique associated with acrylic resin for complete prostheses, considering the effect of thermocycling or disinfection procedures. Therefore, the aim of this study was to evaluate a photopolymerized glaze coating as a final polishing technique for pigmented complete prosthesis acrylic resins, under the influence of thermocycling and two disinfection procedures.…”