The Comparison of Flexural Strength of Provisional Restoration with and without Reinforcement between Self-cure Acrylic Resin and Bis-acrylic Based Composite Resins

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Tularat Sookto
Chawaporn Klongpitayapong
Rinrada Panichpichate
Woraporn Sittiwaitayaporn
Wacharin Hovichitr


The aim of this study was to evaluate the flexural strength of polymethyl methacrylate (Unifast®) polyethyl methacrylate (Dentalon®) and composite resin (Protemp4TM) with and without glass fiber reinforcement (everStick®) at 0 day 7, and 14 days. A total of 162 rectangular specimens (25x2x2 mm.) were prepared. The specimens were divided into 6 groups according to type of materials with glass fiber reinforcement and without reinforcement as a control group. A standard three-point bending test was conducted on the specimens using a universal testing machine at a crosshead speed of 0.5 mm/min after immediate completed polymerization and storage in artificial saliva for 7 and 14 days. The mean values of flexural strength of each provisional material were calculated in N/mm2 and analyzed using the factorial ANOVA and independent t-test (p<0.05). The analysis of Factorial ANOVA test shows that there was statistically significant difference in the flexural strength values of the six groups (p < 0.05). Materials, fiber reinforcement and time have significant effects on the mean flexural strength (p<0.05) and there was a significant interaction among these three factors. For reinforced groups, the mean flexural strength of Unifast® increased from 87.48±5.52 MPa to 97.12±5.54 MPa at 0 day, 92.48±4.79 MPa to 118.32±5.60 MPa at 7 day and 85.65±3.14 to 129.51±5.58 MPa at 14 days. The mean flexural strength of Dentalon® increased from 58.19±4.77 MPa to 89.52±5.81 MPa at 0 day, 71.39±3.78 MPa to 77.24±4.92 MPa at 7 days and 67.67±5.47 to 77.21±5.51 MPa at 14 days. According to the pairwise comparison of Independent t-test, flexural strength values of Unifast® and Dentalon® with reinforcement were higher and statistically significant than those of the Unifast® and Dentalon® without reinforcement (p<0.05). For Protemp4TM, the mean flexural strength increased from 63.84 ±
4.49 MPa to 64.42±4.56 MPa at day 0, 89.61±4.69 MPa to 102.69±5.53 MPa at 7 days and decreased from 110.25±5.59 to 95.03±5.59 MPa. However, there was no significant difference between flexural strength values of Protemp4TM with reinforcement and without reinforcement group (p<0.05) at 0 day and 14 days. Although impregnated glass fiber increased the flexural strength of both PMMA, PEMA and BAC groups, it was significantly higher for PMMA and PEMA resin.


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Sookto T, Klongpitayapong C, Panichpichate R, Sittiwaitayaporn W, Hovichitr W. The Comparison of Flexural Strength of Provisional Restoration with and without Reinforcement between Self-cure Acrylic Resin and Bis-acrylic Based Composite Resins. Khon Kaen Dent J [Internet]. 2019 Jun. 27 [cited 2023 Feb. 5];22(1):16-24. Available from:
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