The effect of short polyethylene fiber with different weight percentages on diametral tensile strength of conventional and resin modified glass ionomer cements.

F Sharafeddin,Sa Ghaboos,Z Jowkar

doi:10.4317/jced.53550

Abstract

BackgroundThe aim of this study was to investigate the effect of polyethylene fiber on diametral tensile strength of conventional and resin modified glass ionomer cements.Material and Methods60 specimens in 6 groups (n=10) were prepared. In group 1 conventional glass ionomer (Fuji GC) and in group 2 resin modified glass ionomer (Fuji LC) were as control groups. In group 3 and 4 conventional glass ionomers mixed with short polyethylene fibers in proportion of 1 wt% and 3 wt%, respectively. In fifth and sixth groups, resin modified glass ionomer and short polyethylene fibers were mixed in 1 and 3% wt, respectively. Samples were prepared in a round brass mold (6.5×2.5 mm). After thermo-cycling, the diametral tensile strength of the specimens were tested and data were analyzed with ANOVA and post-hoc tests (p<0.05).ResultsDiametral tensile strength of both conventional and resin modified glass ionomer cements increased after mixing with polyethylene fiber (p<0.001). Also, reinforcement occurred as the mixing percentage increased from 1% wt to 3% wt in either conventional and resin modified glass ionomer (p<0.001).ConclusionsThe polyethylene fiber was shown to have a significant positive influence on diametral tensile strength of two types of glass ionomers. Key words:Conventional glass ionomer, diametral tensile strength, polyethylene fiber, resin modified glass ionomer.

Highlights

Glass ionomers were introduced due to their unique advantages such as micro-chemical adhesion to tooth structures, their mild pulpal irritation and biocompatibility, but due to some weak mechanical properties, they were not used in restorations of stress bearing areas [1]
There was a significant difference between the two types of glass ionomers and polyethylene fiber (PE) containing groups (p
There was a significant difference between 1% and 3% wt reinforced conventional glass ionomer (CGI) groups (p

Summary

Introduction

Glass ionomers were introduced due to their unique advantages such as micro-chemical adhesion to tooth structures, their mild pulpal irritation and biocompatibility, but due to some weak mechanical properties, they were not used in restorations of stress bearing areas [1]. Kobayashi et al used 60% vol glass fibers [length: 9.7±2.1 μm] for reinforcement of glass ionomer cements [13] In both recent studies, the glass fibers was made in the same composition as that of the fluoro-alumino-silicate in the conventional glass powder because assumed to be more effective [12,13]. It was shown that polyethylene fibers have more effect on flexural strength of conventional and resin modified glass ionomers in comparison to glass fibers [14]. The aim of this study was to investigate the effect of polyethylene fiber on diametral tensile strength of conventional and resin modified glass ionomer cements. Results: Diametral tensile strength of both conventional and resin modified glass ionomer cements increased after mixing with polyethylene fiber (p

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