Year : 2019

Volume : Volume 10

Issue : Issue 1s

Address for correspondence :
Dr. Anumeha Jha.
anumehajha16@gmail.com

Abstract

Background:  Commonly used disinfectants might have significant effect on flexural strength of repaired polymethyl methacrylate denture base resins. This study evaluated the effect of short-term but repeated disinfection on flexural properties of denture base resin. Material and method: A total of 110 rectangular specimens (65*10*3 mm) of heat polymerized PMMA resin were divided into 11 groups. The specimens of all the groups except control were sectioned and repaired with heat polymerized and auto polymerized resin. The specimens were chemically disinfected for 10 minutes in 1%, 2.5% and 5.25% sodium hypochlorite and 2% glutaraldehyde before and after repair except three groups. These were then subjected to three-point bending test in universal testing machine. The transverse strength was calculated from force required to fracture the specimens and the data was subjected to statistical analysis.  Results: The transverse strength of control group specimens was highest (87.01 +/- 3.76) when compared to repaired group specimens (64.654.89 to 52.831.45). The transverse strength of specimens repaired with heatpolymerized acrylic resin (58.832.79 to 64.654.89) was not significantly higher (p > 0.05) than those repaired with auto polymerized acrylic resins (59.373.48 to 52.831.45). The transverse strength of groups repaired and disinfected was not significantly affected by the chemical disinfectant solutions (1%, 2.5% and 5.25% sodium hypochlorite and 2% glutaraldehyde) used in this study (p > 0.05). Conclusions: Within the limitation of the current study neither the type of repair material nor the chemical disinfectants used significantly (p > 0.05) affected the transverse strength of repaired heat-polymerized acrylic resin.

Keywords: Complete Denture Hygiene, Oral health, Oral hygiene practices.