수분 흡수가 여러 레진계 치아고정 재료의 굴곡강도와 탄성계수에 미치는 영향
Influence of water absorption on flexural strength and elastic modulus in several resinous teeth splinting materials
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초록
목적: 본 연구의 목적은 수분 흡수가 여러 레진계 치아고정 재료의 굴곡강도와 탄성계수를 미치는 영향을 비교함으로써물리적 성질에 대한 정보를 제공하는 것이다. 연구 재료 및 방법: 치아고정에 사용하는 레진으로 LightFix, G-FIX, G-aenial Universal Flo를 이용했다. 가로 25 mm, 세로 2 mm, 높이 2 mm의 시편을 각 재료당 즉시용 15개과 에이징용 15개를 제작했다. 즉시용은 37ºC, 100% 상대습도에 24시간 동안 보관됐고 에이징용은 30일 동안 37ºC, 증류수에 보관했다. 만능시험기를 이용해 굴곡강도와 탄성계수를측정했고 independent t-test를 이용해 각 실험 재료의 24시간 군과 30일 군 간 비교를 했다. 실험재료 간의 비교는 oneway ANOVA test로 분석했고 95% 유의 수준으로 Scheffe’s test를 이용해 사후 검정했다. 결과: 본 연구의 결과 LighFix군에서는 에이징 후에 굴곡강도와 탄성계수가 유의하게 감소했고 G-FIX군에서는 에이징후에 굴곡강도와 탄성계수에 유의한 차이가 없었다. G-aenial Universal Flo군에서는 굴곡강도는 유의하게 감소했으나탄성계수는 유의한 변화가 없었다. 한편 굴곡강도와 탄성계수는 24시간 군, 30일 군 모두 LightFix가 가장 낮은 수치, Gaenial Universal Flo가 가장 높은 수치를 보였다. 결론: 어떤 레진의 굴곡강도와 탄성계수는 구강환경에서 에이징시 변화할 수 있으므로 동요치 고정을 목적으로 레진을선택할 때 이를 고려해야 한다.
Abstract
Purpose: The purpose of this study was to compare flexural strength and elastic modulus of several splinting materials dependent on water absorption. Materials and Methods: Three different materials; LightFix, G-FIX, G-aenial Universal Flo; were used in this study. Thirty rectangular bar specimens (25 × 2 × 2 mm) of each materials were prepared. Fifteen specimens of each materials were stored in 100% relative humidity atmosphere, 37°C for 24 hours. The other specimens were stored in distilled water, 37°C for 30 days. Flexural strength and elastic modulus were calculated using Universal testing machine. One-way ANOVA and Scheffe’s post hoc test at 95% level of significance were used on all test results. Results: In LightFix, flexural strength and elastic modulus were significantly decreased after aging. In G-FIX, there was no significant change in flexural strength and elastic modulus after aging. In Gaenial Universal Flo, flexural strength was significantly decreased, but elastic modulus did not change significantly. Statistical analysis reveals that flexural strength and elastic modulus increased in the order of LightFix, G-FIX, G-aenial Flo in both 24 hours and 30 days. Conclusion: It could be deduced from this study that flexural strength and elastic modulus of some resins could be changed when it aged in oral environment. Thus this should be considered when choosing a resin to perform a resin-bonded splint.
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