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KMID : 0974620020200010067
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Bulletin of Dongnam Health University
2002 Volume.20 No. 1 p.67 ~ p.72
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A Study on the Fracture Strength According to Orthodontic Acrylic Resin of Resin Work Technique
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Min Byung-Kuk
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Abstract
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This study aims to maximize the function of base plate in dental orthodontic appliance by comparing fracture strength of base plates manufactured with spray-on technique and doughing technique. S₁-group(spray-on technique) and D₁-group(doughing technique) were manufactured in tap water at room temperature under the pressure of 1㎏/㎠. S₂-group and D₂-group were manufactured in 20℃ distilled water under the pressure of 2㎏/㎠. S₃-group and D₃-group were manufactured in 20℃ distilled water under the pressure of 4㎏/㎠. S₄-group and D₄-group were manufactured in 40℃ distilled water under the pressure of 2㎏/㎠. S_(5)-group and D_(5)-group were manufactured in 40℃distilled water under the pressure of 4㎏/㎠. In each group 5 sample plates of each group were prepared with the size of 25×2×2㎜. so total 50 sample plates were manufactured using self-curing resin. After sample plates were immersed in distilled water(37±1℃) for one day. the fracture strength of each was measured with 3 point flexural equipment of Instron. The results are as follows: 1. When sample plates were manufactured in tap water at room temperature under the pressure of 1㎏/㎠. the fracture strength was low regardless of the resin work technique. 2. When sample plates were manufactured in 20℃ distilled water under the pressure of 2㎏/㎠, sample plates manufactured with doughing technique(D₂) showed significantly higher fracture strength(p<.05) than those with spray-on technique(S₂). When sample plates were manufactured with spray-on technique in 20℃ distilled water, sample plates manufactured under the pressure of 4㎏/㎠(S₃) showed significantly higher fracture strength(p<.05) than those under the pressure of 2㎏/㎠(S₂). 3. When sample plates were manufactured in 40℃ distilled water, sample plates manufactured with doughing technique showed higher fracture strength than those with spray-on technique. But, there were no significant differences in fracture strength between the resin work technique or between the pressure. With these results. the fracture strength of sample plates will be higher when the temperature of distilled water and the pressure increased, and when sample plates were manufactured with doughing technique rather than with spray-on technique.
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