Flexural Strength Of Provisional Restorative Materials Upon Aging

Supichaya Srisontisuk, Niwut Juntavee, Apa Juntavee


Background: Aging may affect strength of provisional restorative materials.

Objective: This study evaluated the effect of aging on strength of heat-polymerized polymethyl methacrylate (Hp-PMMA), auto-polymerized (Ap) PMMA, bis-phenyl-glycidyl dimethacrylate (Bis-GMA), and computer-aided design/computer-aided manufacturing (CAD/CAM) containing either PMMA or acrylate resin.

Methods: Two hundred-ten bars (2x2x25mm) were fabricated from Hp-PMMA: Major C&B (M); Ap-PMMA: Unifast™ (U); Bis-acryl: Protemp™ (P), Luxatemp® (L); PMMA-CAD/CAM: Telio® CAD (T), artBloc® (R); and acrylate-CAD/CAM: Vita CAD Temp® (V). Each was divided into aging- (A) and non-aging- (N) groups (n=15 each). A-groups were thermo-cycled (5°C v.s 55°C, 30 sec each, 5000 cycles). Flexural strength was determined in universal testing machine at 1 mm/min crosshead speed, 50N/min loading. An analysis of variance (ANOVA) and Bonferroni’s test was determined for significant difference (α=0.05). Weibull statistics were determined for Weibull modulus (m), and characteristics strength (σo). Scanning electron micrographs (SEM) were examined for fracture surfaces.

Results: The values (means±sd (MPa), m, σo) were (84.62± 3.73, 25.23, 86.53) and (84.05± 6.39, 13.21, 87.28) for VN and VA, (133.49± 4.32, 34.09, 135.54) and (123.11± 4.55, 28.76, 125.35) for TN and TA, (120.59± 6.94, 19.01, 123.84) and (119.96± 6.90, 19.21, 123.16) for RN and RA, (94.35± 4.07, 25.82, 96.24) and (93.07± 3.22, 32.19, 94.58) for PN and PA, (110.60± 6.20, 19.99, 113.44) and (97.23± 7.77, 13.82, 100.78) for LN and LA, (114.30± 5.21, 23.90, 116.79) and (112.21± 5.70, 19.86, 115.13) for MN and MA, and (89.45± 2.96, 32.77, 90.88) and (84.96± 5.33, 17.66, 87.42) for UN and UA respectively. T revealed the highest, whereas V possessed the lowest strength for both N- and A- condition. Aging significantly affected strength.

Conclusions: Flexural strengths were differences among materials. PMMA-CAD/CAM possessed the highest, while acrylate-CAD/CAM possessed the lowest. Hp-PMMA showed better strength than Ap-PMMA. Bis-acryl resin was stronger than Ap-PMMA. Aging reduced strength for all materials tested.

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