[EO-28] Title: EFFECT OF REPEATED MICROWAVE DISINFECTION ON THE FLEXURAL STRENGTH, IMPACT STRENGTH & SURFACE HARDNESS OF A HEAT CURE DENTURE BASE RESIN – AN IN VITRO STUDY
Sub Title: EFFECT OF REPEATED MICROWAVE DISINFECTION ON THE PHYSICAL PROPERTIES OF A HEAT CURE DENTURE BASE RESIN – AN IN VITRO STUDY
[Abstract]
Objective: Control of cross-infection has been a subject of interest to the area of dentistry over the last few decades, due to the transmission of infectious diseases. Dentures can be disinfected mechanically, chemically or a combination of both.[1] In order to overcome the disadvantages of mechanical and chemical disinfection, the use of microwave energy has been suggested in dentistry as a simple alternative to prostheses disinfection.[2,3] Hence, the purpose of this study was to evaluate the effect of repeated microwave disinfection on the flexural strength, impact strength and surface hardness of a heat cure denture base resin.
Method: 180 samples of heat cure polymethyl methacrylate resin were fabricated and divided in 3 main groups of 60 each for flexural, impact strength and surface hardness. Each group was further sub-divided into 4 sub-groups, according to the number of microwave cycles (MWC) applied for disinfection.[4]
Result and Discussion: For the normally distributed data, the mean of 4 groups was done using one way ANOVA and student t-test for pair-wise comparison. The computer software, NCSS, EPI INFO and WinSTAT (MS Excel), were used to perform statistical calculations. No significant change on the flexural , impact strength and surface hardness of a heat cure denture base resin on repeated microwave disinfection. The repeated microwave disinfection showed statistically non-significant change in the physical properties of the polymethyl methacrylate resin. Microwave disinfection can be safely used in regular practice, to avoid cross contamination.
References1 Banting D W and Hill SA. Microwave disinfection of dentures for the treatment of oral candidiasis. Spec Care Dentist 2001; 21(1): 4-8. 2 Shay K. Denture Hygiene: A review and update. J Contemp Dent Pract 2000; 1: 1-8.3 Daniela G R, Pavarina AC, Lívia N D et al .Denture disinfection by microwave irradiation: A randomized clinical study. J Dent 2009; 37: 666-672.4 Ali A M. and Raghdaa K J. Evaluation and comparison of the effect of repeated microwave irradiations on some mechanical and physical properties of heat cure acrylic resin and Valplast (nylon) denture base materials. J Bagh College Dent 2011; 23(3): 6-10.
Objective: Control of cross-infection has been a subject of interest to the area of dentistry over the last few decades, due to the transmission of infectious diseases. Dentures can be disinfected mechanically, chemically or a combination of both.[1] In order to overcome the disadvantages of mechanical and chemical disinfection, the use of microwave energy has been suggested in dentistry as a simple alternative to prostheses disinfection.[2,3] Hence, the purpose of this study was to evaluate the effect of repeated microwave disinfection on the flexural strength, impact strength and surface hardness of a heat cure denture base resin.
Method: 180 samples of heat cure polymethyl methacrylate resin were fabricated and divided in 3 main groups of 60 each for flexural, impact strength and surface hardness. Each group was further sub-divided into 4 sub-groups, according to the number of microwave cycles (MWC) applied for disinfection.[4]
Result and Discussion: For the normally distributed data, the mean of 4 groups was done using one way ANOVA and student t-test for pair-wise comparison. The computer software, NCSS, EPI INFO and WinSTAT (MS Excel), were used to perform statistical calculations. No significant change on the flexural , impact strength and surface hardness of a heat cure denture base resin on repeated microwave disinfection. The repeated microwave disinfection showed statistically non-significant change in the physical properties of the polymethyl methacrylate resin. Microwave disinfection can be safely used in regular practice, to avoid cross contamination.
References1 Banting D W and Hill SA. Microwave disinfection of dentures for the treatment of oral candidiasis. Spec Care Dentist 2001; 21(1): 4-8. 2 Shay K. Denture Hygiene: A review and update. J Contemp Dent Pract 2000; 1: 1-8.3 Daniela G R, Pavarina AC, Lívia N D et al .Denture disinfection by microwave irradiation: A randomized clinical study. J Dent 2009; 37: 666-672.4 Ali A M. and Raghdaa K J. Evaluation and comparison of the effect of repeated microwave irradiations on some mechanical and physical properties of heat cure acrylic resin and Valplast (nylon) denture base materials. J Bagh College Dent 2011; 23(3): 6-10.