CAJ | 학술논문

目的：：探讨不同浓度氟化物对氟牙症釉质硬度值及表面微观结构的影响。方法：收集临床拔除的中度氟斑恒牙56个,将每个牙冠部平均切割为3等份( n=56),分别列入A、B、C组。 A组样本置于蒸馏水中,B组置于60 mg/L 氟化钠液中, C组置于120 mg/L氟化钠液中。3组浸泡液均每天更换1次,并于37℃恒温箱放置10 d。用显微硬度计分别测定浸泡前后釉质表面硬度值,扫描电镜观察釉质表面微观及形态变化。结果：3组浸泡前釉质显微硬度均无显著差异(P>0.05)；浸泡后,釉质显微硬度 B组>A组>C组(P<0.05)。浸泡后釉质显微硬度与浸泡前相比：A组无明显变化(P>0.05),B组明显提高(P<0.05),C组明显降低(P<0.05)。除B组外,A、C组釉质表面未见反应物沉积。结论：高浓度氟化物可使氟斑牙硬度值降低,无釉质再矿化作用,氟牙症患者更适合用含有低浓度氟化物的牙膏。
목적：：탐토불동농도불화물대불아증유질경도치급표면미관결구적영향。방법：수집림상발제적중도불반항아56개,장매개아관부평균절할위3등빈( n=56),분별렬입A、B、C조。 A조양본치우증류수중,B조치우60 mg/L 불화납액중, C조치우120 mg/L불화납액중。3조침포액균매천경환1차,병우37℃항온상방치10 d。용현미경도계분별측정침포전후유질표면경도치,소묘전경관찰유질표면미관급형태변화。결과：3조침포전유질현미경도균무현저차이(P>0.05)；침포후,유질현미경도 B조>A조>C조(P<0.05)。침포후유질현미경도여침포전상비：A조무명현변화(P>0.05),B조명현제고(P<0.05),C조명현강저(P<0.05)。제B조외,A、C조유질표면미견반응물침적。결론：고농도불화물가사불반아경도치강저,무유질재광화작용,불아증환자경괄합용함유저농도불화물적아고。
AIM:To study the effect of different concentrations of fluoride on dental enamel hardness and surface microstructure of the teeth with dental fluorosis. METHODS:56 extracted teeth with moderate fluorosis were collected and each crown was divided into 3 equal parts and set in group A, B and C respectively. The crown samples of group A, B and C were placed in distilled water, 60 mg/L and 120 mg/L sodium fluoride solution respectively in a 37℃ oven for 10 d. The solutions of the 3 groups were changed once daily. The hardness, microstructure and change of enamel surface of the samples were detected before and after immersion using micro hardness tester and scanning electron microscopy (SEM) respectively. RESULTS:No statistically significant difference was found in the enamel microhardness among the 3 groups before immer-sion (P >0. 05). After soaking, the enamel microhardness of group B was higher than that of group A and group C (P<0. 05), and that of group A was higher than that of group C (P<0. 05). After sooking the enamel microhardness in group A was not changed(P>0. 05), in group B increased (P<0. 05), in group C reduced(P<0. 05). SEM observation showed that enamel surface in group B had reactive deposit, but in group A and group C had not. CONCLUSION:High concentration fluoride solution can decrease enamel hardness and remineralization of the teeth with dental fluorosis. Low con-centration fluoride toothpaste is more suitable for patients with dental fluorosis.