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KMID : 1023420150150030259
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Journal of Dental Hygiene Science
2015 Volume.15 No. 3 p.259 ~ p.264
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Flexural Properties according to Change of Polymerization Temperature of Autopolymerized Resin for Orthodontic
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Lee Gyu-Sun
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Abstract
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For this experiment, specimen was manufactured by injecting polymer and monomer into silicon mold with volume ratio of 2.5:1 based on ISO 20795-2 so that average thickness, width and length of specimen would be maintained as 3.3 mm, 10.0 mm and 65.0 mm, respectively depending on spray on technique. Specimen was divided into 3 groups (25℃, 40℃, 70℃) depending on polymerization temperature and 10 specimen was manufactured for each group and it was polymerized in water tank of ±1oC under the setting condition of polymerization time of 15 minutes and pressure of 3 bar. After keeping specimen in distilled water of 37℃ for over 48 hours before experiment, flexural strength (FS) and elasticity modulus (EM) of specimen being tested by using Intron (3344; Instron; Instron). SPSS ver. 16.0 was used for analysis and post-hoc test of Scheffe was performed after using one-way ANOVA. When comparing mean value of FS of resin for orthodontics, it was represented in the range of 71.500 MPa for 25℃ group, 74.920 MPa for 40℃ group and 76.880 MPa for 70℃ group and difference was shown in the order of 25℃ group ＜40℃ group ＜70℃ group but such difference was not significant statistically (p=0.052). Result of EM mean value of resin for orthodontics was more polymerization temperature was high, the more was significant difference represented in the order of 25℃ group ＜40℃ group ＜70℃ group (p ＜0.039).
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KEYWORD
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Autopolymerizing acrylic resin, Flexural strength, Polymerization temperature
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