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KMID : 1035320180450010057
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Korean Society for Dental Materials
2018 Volume.45 No. 1 p.57 ~ p.65
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The Effect of Different Curing Condition on the Flexural Strength and Translucency of Orthodontic Acrylic Resin
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Jung Sun-Mi
Park Mi-Gyoung
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Abstract
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The purpose of this study is to evaluate the effects of polymerization conditions on the flexural strength and transparency of orthodontic acrylic resin. Materials and methods: The specimens were prepared by applying pressure of 1 bar, 2 bar and 4 bar in air, room temperature water, 50℃ water and 70℃ water. The flexural strength of each specimen was measured using a universal testing machine and the translucency parameter (TP) was calculated by measuring the CIE L*a*b* value of each specimen using a spectrophotometer. The flexural strength of orthodontic acrylic resin was the highest in water at 50℃, and the flexural strength was significantly lower in the order of 70℃ water, room temperature water and air (P<0.01). As the pressure increased, the flexural strength of orthodontic acrylic resin did not show any significant difference (P>0.05). The transparency of orthodontic acrylic resin showed the highest value in air and was significantly lower in the order of room temperature, 50℃ water and 70℃ water (P<0.001). The transparency of orthodontic acrylic resin did not show any significant difference with increasing pressure (P>0.05). Within the limits of this study, the flexural strength and transparency of the orthodontic acrylic resin differ according to polymerization conditions, but there is no difference according to the pressure.
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KEYWORD
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Orthodontic acrylic resin, Flexural strength, Transparency, Curing condition
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