目的:体外评价奥威尔牙膏、绿茶浸提液、碳酸氢钠液、多乐氟对釉质的再矿化及脱矿抑制的作用。方法:(1)釉质再矿化实验:选择60个离体牙,用酸蚀剂脱矿30 s后,随机分为5组(n=12),分别使用人工唾液(A组)、奥威尔牙膏(B组)、绿茶浸提液(C组...目的:体外评价奥威尔牙膏、绿茶浸提液、碳酸氢钠液、多乐氟对釉质的再矿化及脱矿抑制的作用。方法:(1)釉质再矿化实验:选择60个离体牙,用酸蚀剂脱矿30 s后,随机分为5组(n=12),分别使用人工唾液(A组)、奥威尔牙膏(B组)、绿茶浸提液(C组)、碳酸氢钠液(D组)、多乐氟(E组)处理12 d;(2)釉质脱矿抑制实验:另选择60个离体牙,不进行脱矿处理,随机分为5组(n=12),处理方法同釉质再矿化实验各组;12 d后将5组均置于可口可乐中脱矿3次,每次浸泡1 h,间隔12 h。两个实验均用SEM观察釉质表面形貌,能谱分析仪(EDS)分析釉质表面钙磷比。结果:(1)釉质再矿化实验:SEM观察结果显示,B、C、D、E组均有沉积物附着于釉质表面凹陷内;钙磷比值依次为C、D组> E组> B组> A组(P<0.05; C vs D,P> 0.05);(2)釉质脱矿抑制实验:SEM观察结果显示,A、B组釉质表面有明显凹陷,C、D、E组凹陷较浅,且有沉积物附着;钙磷比值依次为C组> D组> E组> A、B组(P<0.05; A vs B,P>0.05)。结论:奥威尔牙膏、绿茶浸提液、碳酸氢钠液、多乐氟均有再矿化能力和抑制釉质脱矿作用,其中绿茶浸提液和碳酸氢钠液的效果优于多乐氟和奥威尔牙膏。展开更多
In this work,the regeneration mechanism of potassium carbonate solution after absorption of CO2 using ion-exchange membrane electrolysis was presented.The solutions of potassium carbonate(K2CO3) and potassium bicarbon...In this work,the regeneration mechanism of potassium carbonate solution after absorption of CO2 using ion-exchange membrane electrolysis was presented.The solutions of potassium carbonate(K2CO3) and potassium bicarbonate(KHCO3) were used to simulate the solution after absorbing CO2.Experiments were carried out at various electrodes,temperatures and current densities.The results indicate that the membrane electrolysis can in-crease concentration ratio of K2CO3 and KHCO3,and achieve 100%conversion.In this process,not only CO2 is desorbed from carbonate solution,but also hydrogen,as a byproduct,is generated at the cathode,which is the main contributor to reduce energy consumption.Thus,the membrane electrolysis is valuable in the regeneration of the K2CO3 absorbent.展开更多
文摘目的:体外评价奥威尔牙膏、绿茶浸提液、碳酸氢钠液、多乐氟对釉质的再矿化及脱矿抑制的作用。方法:(1)釉质再矿化实验:选择60个离体牙,用酸蚀剂脱矿30 s后,随机分为5组(n=12),分别使用人工唾液(A组)、奥威尔牙膏(B组)、绿茶浸提液(C组)、碳酸氢钠液(D组)、多乐氟(E组)处理12 d;(2)釉质脱矿抑制实验:另选择60个离体牙,不进行脱矿处理,随机分为5组(n=12),处理方法同釉质再矿化实验各组;12 d后将5组均置于可口可乐中脱矿3次,每次浸泡1 h,间隔12 h。两个实验均用SEM观察釉质表面形貌,能谱分析仪(EDS)分析釉质表面钙磷比。结果:(1)釉质再矿化实验:SEM观察结果显示,B、C、D、E组均有沉积物附着于釉质表面凹陷内;钙磷比值依次为C、D组> E组> B组> A组(P<0.05; C vs D,P> 0.05);(2)釉质脱矿抑制实验:SEM观察结果显示,A、B组釉质表面有明显凹陷,C、D、E组凹陷较浅,且有沉积物附着;钙磷比值依次为C组> D组> E组> A、B组(P<0.05; A vs B,P>0.05)。结论:奥威尔牙膏、绿茶浸提液、碳酸氢钠液、多乐氟均有再矿化能力和抑制釉质脱矿作用,其中绿茶浸提液和碳酸氢钠液的效果优于多乐氟和奥威尔牙膏。
基金Supported by the Specialized Research Fund for Doctoral Programme of Higher Education of MOE（200700033154 200800030095） the National Natural Science Foundation of China（20836008）
文摘In this work,the regeneration mechanism of potassium carbonate solution after absorption of CO2 using ion-exchange membrane electrolysis was presented.The solutions of potassium carbonate(K2CO3) and potassium bicarbonate(KHCO3) were used to simulate the solution after absorbing CO2.Experiments were carried out at various electrodes,temperatures and current densities.The results indicate that the membrane electrolysis can in-crease concentration ratio of K2CO3 and KHCO3,and achieve 100%conversion.In this process,not only CO2 is desorbed from carbonate solution,but also hydrogen,as a byproduct,is generated at the cathode,which is the main contributor to reduce energy consumption.Thus,the membrane electrolysis is valuable in the regeneration of the K2CO3 absorbent.
