43425_131219_article final copy(1).html - EFFECT OF REPEATED MICROWAVE DISINFECTION IN WET AND DRY CONDITION ON LINEAR DIMENSION OF ACRYLIC DENTURE

43425_131219_article final copy(1).html - EFFECT OF...

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EFFECT OF REPEATED MICROWAVE DISINFECTION IN WET AND DRY CONDITION ON LINEAR DIMENSION OF ACRYLIC DENTURE BASE RESIN ABSTRACT Introduction: Increasing awareness among people has caused tremendous changes in health care sector. It is the legal and ethical responsibility of the dental practitioner to prevent cross contamination between the patients, staff members and to him or herself. Emergence of many barrier techniques have been followed in clinics as well as in dental laboratories. With increase in prevalence of infectious diseases nowadays, the concern regarding infection control in dentistry is undergoing a dramatic change and emphasis on sterilization and disinfection procedure has become a major concern. AIM - To evaluate the effect of repeated microwave disinfection in wet and dry condition on linear dimension of acrylic denture base resin. Material and methods – 30 rectangular specimens (65mm x10mm x3mm) were fabricated using stainless steel dies (ADA specification no. 12) from heat cure denture base resin for evaluation of linear dimension change. Specimens were divided into three groups (n =10). The first group was kept as positive control whereas the other two were subjected to microwave disinfection in wet and dry conditions. The specimens were tested for linear dimensional change using video zoom microscope. Data obtained by testing was compiled and was analyzed using ANOVA and Post-hoc tests. Results - Results showed change in linear dimension was observed in wet disinfection group compared to dry disinfection and control group, whereas no statistical significant difference was observed in control and dry disinfection group. Conclusion : Within limitation of this in study it was concluded that since no significant difference was found between dry disinfection group and control group, dry disinfection can be used as an alternative to chemical or mechanical method of disinfection without affecting the linear dimension of the denture base resin. Since wet disinfection caused higher shrinkage, should be used cautiously Keywords: microwave disinfection, linear dimension, acrylic resin, micro- organisms. . INTRODUCTION With increase in overall life span of elderly people because of better medical facilities, there is tremendous increase in denture wearing population 1 . Acrylic resin since its introduction in 1937 by W.H White has been an extremely popular in fabrication of removable denture due to its certain desirable properties like aesthetics, easy manipulation and low cost. 2,3,4 Despite its superior physical and aesthetic properties over previously introduced denture materials, it is porous in nature which makes it difficult to clean and hence it is susceptible to plaque accumulation 5 . The dentureprosthesisalsoget contaminated during fabrication and other procedures i.e.

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