The influence of powder liquid ratio on the flexural strength of fibre reinforced acrylic resin material
du Rand, M.
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Introduction: Often the powder liquid (P/L) ratio of polymethyl methacrylate (PMMA) resins is changed to modify the handling properties of the material. While it is known that this may influ ence the mechanical properties of unreinforced PMMA resin, little is known about its effect on fibre reinforced resin. Purpose: The purpose of this study was to determine how different P/L ratios influence the flexural strength (FS) of a glass fibre reinforced autopolymerizing PMMA resin used for fabr icating fixed partial dentures. Results: FS values of all reinforced subgroups were significant ly higher than the values of the unreinforced subgroups (p<O.OS). Among the 3 unreinforced subgroups the difference in FS was in significant (p>O.OS) . Within the reinforced group there was a sig nificant difference between the control group, which had a higher median FS value than the two other subgroups (p<O.OS). Conclusion: When reinforcing PMMA resin with glass fibre, it is important to use the recommended P/L ratio. For unrelnforced PMMA resin the P/L ratio can be changed within limits without adverse effects on the FS.