This study was performed to investigate the effect of thermocycling on the transverse strength of dental nano-filled composite resins. Five commercially available nano-filled composite resins (Grandio (GD), Filtek Z350 (Z35), Aelite body (AB), Charmfil plus (CF) and Tetric N ceram (TC), two hybrid c...
This study was performed to investigate the effect of thermocycling on the transverse strength of dental nano-filled composite resins. Five commercially available nano-filled composite resins (Grandio (GD), Filtek Z350 (Z35), Aelite body (AB), Charmfil plus (CF) and Tetric N ceram (TC), two hybrid composite resins (Aelite universal (AU) and Filtek Z250 (Z25)), and one microfilled composite resin (Helio molar) were used as experimental materials. Thermal cycling test was conducted for 10,000 cycles at 15 seconds dwell time each in 5℃ and 55℃ bath. Three point flexural test was conducted at the crosshead speed of 0.5 ㎜/min, and fracture surfaces were examined by a scanning electron microscope (SEM). In order to investigate the changes of surface properties by thermocycling, Knoop hardness and surface roughness were tested. Data were analyzed using Weibull distribution, one-way analysis of variance (ANOVA), and t-test. The results obtained were summarized as follows; 1. The strength data were fit to single-mode Weibull distribution (r2>0.7). Transverse strengths of all specimens were significantly decreased after thermal cycling test of 10,000 cycles (P<0.05). 2. The highest characteristic strength value of 122.5 ㎫ was observed in AB group after 10,000 thermocycles and showed the significant differences between other groups except GD and Z25 groups (P<0.05). 3. The highest Weibull modulus value of 15.329 was obtained in TC group showed the lowest variance of strength. 4. Knoop hardness numbers of thermocycling groups showed the increase to 2,000 thermocycles, and significantly increased in AB, CF, AU and Z25 groups (P<0.05). 5. Surface roughness values of all experimental groups were increased after thermal cycling treatment, and showed the significant differences in AB, CF, AU and Z25 groups after 10,000 cycles (P<0.05). 6. Observation of fracture surfaces after 3-point flexural test revealed that the fracture patterns were the crack deflection, the pull-out and the fracture of fillers.
This study was performed to investigate the effect of thermocycling on the transverse strength of dental nano-filled composite resins. Five commercially available nano-filled composite resins (Grandio (GD), Filtek Z350 (Z35), Aelite body (AB), Charmfil plus (CF) and Tetric N ceram (TC), two hybrid composite resins (Aelite universal (AU) and Filtek Z250 (Z25)), and one microfilled composite resin (Helio molar) were used as experimental materials. Thermal cycling test was conducted for 10,000 cycles at 15 seconds dwell time each in 5℃ and 55℃ bath. Three point flexural test was conducted at the crosshead speed of 0.5 ㎜/min, and fracture surfaces were examined by a scanning electron microscope (SEM). In order to investigate the changes of surface properties by thermocycling, Knoop hardness and surface roughness were tested. Data were analyzed using Weibull distribution, one-way analysis of variance (ANOVA), and t-test. The results obtained were summarized as follows; 1. The strength data were fit to single-mode Weibull distribution (r2>0.7). Transverse strengths of all specimens were significantly decreased after thermal cycling test of 10,000 cycles (P<0.05). 2. The highest characteristic strength value of 122.5 ㎫ was observed in AB group after 10,000 thermocycles and showed the significant differences between other groups except GD and Z25 groups (P<0.05). 3. The highest Weibull modulus value of 15.329 was obtained in TC group showed the lowest variance of strength. 4. Knoop hardness numbers of thermocycling groups showed the increase to 2,000 thermocycles, and significantly increased in AB, CF, AU and Z25 groups (P<0.05). 5. Surface roughness values of all experimental groups were increased after thermal cycling treatment, and showed the significant differences in AB, CF, AU and Z25 groups after 10,000 cycles (P<0.05). 6. Observation of fracture surfaces after 3-point flexural test revealed that the fracture patterns were the crack deflection, the pull-out and the fracture of fillers.
주제어
#Nano-Filled Composite Resin Dental Restoration Transverse Strength Thermal Cycling
※ AI-Helper는 부적절한 답변을 할 수 있습니다.