Geerts, Gretadu Rand, M.2013-11-272013-11-272009Geerts, G.A.V.M. & du Rand, M. (2009). The influence of powder liquid ratio on the flexural strength of fibre reinforced acrylic resin material. South African Dental Journal, 64(3): 110-1161029-4864http://hdl.handle.net/10566/872Introduction: 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.enThis file may be freely used for educational uses. No commercial reproduction or distribution of this file is permitted without written permission of the South African Dental Association (SADA). Note that the SADA retains all intellectual property rights in the article.Polymethyl methacrylate resinGlass fibrePowder liquid ratioArticle