산성 환경이 Tricalcium Silicate 재료의 압출강도와 표면형태에 미치는 영향
Effect of Acidic Environment on the Push-Out Bond Strength and Surface Morphology of Tricalcium Silicate Materials
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초록
이 연구의 목적은 다양한 산성 환경에서 규산 삼칼슘 재료인 Biodentine, Theracal, ProRoot MTA의 압출강도를 측정하고 표면형태를 관찰하는 것이었다. 각각의 재료에 대해 샘플을 4개의 그룹으로 나누었다. 산성 조건 그룹은 pH 4.4, 5.4, 6.4의 부티르산 조건에서, 대조군그룹은 pH 7.4의 인산완충식염수 조건에서 4일간 37℃에서 보관하였다. 이후 압출강도를 측정하고 표면 형태를 분석하였다. Biodentine과 Theracal은 모든 산성 조건에서 ProRoot MTA 보다 더 높은 압출강도를 보였고 pH 감소에 따라 압출강도가 감소하였다. 주사전자현미경을 이용한 관찰 결과 재료들 모두 산성 조건에서 표면 형태에 상당한 변화를 보였다. 결론적으로, Biodentine과 Theracal은 ProRoot MTA와 비교하여 더 높은 압출강도를 보였다. 또한 산성 조건은 규산삼칼슘 재료들의 압출강도와 미세구조를 약화시킬 수 있다.
Abstract
The aim of this study was to evaluate the effect of a range of acidic pH values on the push-out bond strength and surface morphology of tricalcium silicate materials: Biodentine, Theracal and ProRoot MTA. The standardized lumens of root slices prepared from extracted single-root human teeth were filled with Biodentine, Theracal and ProRoot MTA according to manufacturer’s instructions. The specimens were randomly divided into 4 groups (n = 20) for each material and then incubated for 4 days at 37℃; 3 acidic groups (butyric acid buffered at pH 4.4, 5.4, 6.4) and 1 control group (phosphate buffered saline solution at pH 7.4). The push-out bond strengths were then measured by using a universal testing machine and the surface morphology of each experimental group was analyzed by a scanning electron microscope. Biodentine and Theracal showed higher push-out bond strength compared with ProRoot MTA after exposure to acidic pH values. A substantial change in the surface morphology of each material occurred after exposure to different pH values. In conclusion, the push-out bond strengths of Biodentine and Theracal are higher than the ProRoot MTA. Further the acidic environment weakens the push-out bond strength and microstructure of tricalcium silicate materials.
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