Title: Comparative Study of Transverse Strength and Water Sorption between Conventional and Fiber Reinforced Denture Base Resins – An in Vitro Study
Authors: Dr Durga Bhavani Kanaparthi, Dr Atluri Kaleswara Rao, Dr Tripuraneni Sunil Chandra
DOI: https://dx.doi.org/10.18535/jmscr/v5i7.132
Abstract
Background & Objectives: The purpose of this study is to compare and evaluate the transverse strength and water sorption of conventional and high impact strength denture base resins with the same reinforced with glass fibers.
Materials and Methods: Three hundred and sixty identical samples of dimensions 65×10×3.3mm were fabricated from three materials (Group I – DPI, Group II – TREVALON HI and Group III – LUCITONE 199) according to ADA / ANSI Specification No. 12. Each group is divided into two subgroups A and B. 180 specimens were prepared for transverse strength and 180 specimens were prepared for water sorption. These 180 specimens were divided into 30 specimens for each subgroup A and B in three groups.
The standard three point bend test was carried out in Universal Testing Machine at a cross head speed of 1mm/min to evaluate the transverse strength.
For the evaluation of water sorption, the specimens were placed in a desiccator before weighing until a constant mass was reached. The dried specimens were immersed in artificial saliva and placed in an incubator at a temperature of 37oc ± 1oc. The specimens were weighed on Electronic weighing balance.
The mean values of transverse strength and water sorption of each material were calculated and the data was analysed using One way ANOVA, TUKEY and t- tests (0.05).
Results: The highest mean transverse strength was found for high impact strength resins reinforced with glass fibers and the lowest mean transverse strength was found for conventional and high impact strength denture base resin materials. The highest mean water sorption was found for conventional denture base resin material and the lowest mean water sorption was found for high impact strength resins reinforced with glass fibers.
Interpretations & Conclusions Conventional and high impact strength resins reinforced with glass fibers exhibited greater transverse strength values than the unreinforced resin materials compared in this study. Conventional and high impact strength denture base resin materials exhibited greater water sorption values than the same reinforced with glass fibers.
Keywords: Conventional denture base resin, High impact strength resins, Glass fibers.
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Dr Durga Bhavani Kanaparthi
Drs. SNDC Dental, College