氟化钠、茶多酚对牙釉质再矿化效果分析

目的 探讨氟化钠、茶多酚对牙釉质再矿化效果。方法 选人体离体牙24颗,随机均分为4组。A组电镜观察未脱矿釉质表层,B、C、D组脱矿后分别涂抹去离子水、NaF溶液、茶多酚溶液。再矿化完成后,用肉眼、电镜观察样本并记录脱矿指标,同时用显微硬度计测量各样本表面的硬度。结果 氟化钠组和茶多酚组均可见釉质有多边形不规则沉积物覆盖于釉面微孔隙表面,但茶多酚组能观察到明显微孔隙。再矿化后各组釉质块的显微硬度平均值均有所上升,氟化钠组升高最多,茶多酚组次之,差异有统计学意义（P<0.05）。结论 氟化钠与茶多酚均能促进再矿化的形成、恢复牙釉质,氟化钠的效果更佳。     

比较邻面不同去釉方法对牙釉质的影响

目的:通过体外p H的循环实验,寻找一种具有较好临床效果的邻面去釉法。方法:收集由于正畸减数法治疗的前磨牙40颗,沿牙体长轴纵向剖开,得到80个样本,按随机法分成5组。Ⅰ组为片切盘,Ⅱ组为片切砂条,Ⅲ组为片切盘+抛光+35%磷酸,Ⅳ组为片切砂条+抛光+35%磷酸,Ⅴ组为未去釉组。均经体外p H循环1个月后,通过显微硬度仪和扫描电镜检测,用统计学软件对数据分析。结果:(1)每组的显微硬度相互比较,Ⅰ组与Ⅱ组、Ⅲ组与Ⅳ组之间无明显差异(P0.05);Ⅱ组与Ⅳ组、Ⅱ组与Ⅲ组、Ⅰ组与Ⅳ组、Ⅰ组与Ⅲ组间有显著差异(P0.01);Ⅰ组、Ⅱ组、Ⅲ组、Ⅳ组均与Ⅴ组数据有明显差异(P0.05)。(2)肉眼及扫描电镜观察,Ⅲ组和Ⅳ组没有明显差异,但均优于其他组。结论:(1)去釉盘、去釉砂条两者的去釉效果没有明显差别。(2)抛光组的再矿化效果明显得到提高。(3)邻面去釉后釉质表面的划痕,虽然经过再矿化,也比较难恢复。     

酪蛋白磷酸多肽对牙釉质龋再矿化作用的初步研究

目的 :检测酪蛋白磷酸多肽 (CPP)否具有促进牙釉质龋再矿化的作用。方法 :选择无龋离体牙制成人工龋标本 ,用含 0 2 %CPP的再矿化液处理。借助显微硬度计、扫描电镜、偏光显微镜观察 0 2 %CPP的再矿化液对牙釉质龋的再矿化效果。结果 :与对照组相比 ,0 2 %CPP的再矿化液处理后显微硬度明显增加 ,有显著的统计学意义。扫描电镜观察釉质表面有不规则的矿化物沉积 ,偏光显微镜下表现为以矿化为主的负性双折射区变宽。结论 :CPP在牙釉质龋的再矿化过程中具有重要的促进作用     

多乐氟氟保护漆对乳牙釉质脱矿和再矿化效果的实验研究

目的体外评价多乐氟氟保护漆对乳牙早期龋的脱矿和再矿化效果。方法离体乳牙标本80例,分为多乐氟组、5%氟化钠溶液组及人工唾液对照组,利用p H-循环模型在乳牙标本上形成人工龋,然后进行脱矿-再矿化循环处理,比较三组釉质表面钙释出率、乳牙牙釉质显微硬度及牙釉质表面氟含量的变化。结果多乐氟组乳牙釉质表面钙释出率明显低于5%氟化钠溶液组及人工唾液组,再矿化后的显微硬度、表面氟含量明显高于5%氟化钠溶液组及人工唾液对照组,差异均有统计学意义(P0.05)。结论多乐氟可明显抑制乳牙早期龋脱矿,促进其再矿化。     

磷酸多肽对牙釉质龋再矿化作用的研究

目的：检测CPP有无促进牙釉质龋再矿化的作用，及两种浓度CPP对促进再矿化作用有无差别。方法：应用离体牙制备人工釉质龋标本32例，分别放入0．2％和1．0％CPP再矿化液处理后，应用显微硬度计，扫描电镜观察牙釉质表面的改变。结果：0．2％和1．0％浓度CPP再矿化后，牙釉质表面硬度值显著增高，釉质表面有明显的不规则沉淀物，釉面孔隙变小。结论：两种浓度CPP均对牙釉质龋的再矿化有明显的促进作用，但两种浓度CPP的促进矿化作用没有显著差别。     

生物活性玻璃对早期人工釉质龋的再矿化*

背景:生物活性玻璃具有良好的生物相容性,且具有抑制口腔致龋细菌和牙周相关细菌及抗牙本质过敏的作用.目的:评价生物活性玻璃促进早期人工釉质龋再矿化的作用.方法:将新鲜拔除的30颗牛切牙制成人工龋模型,将标本在37℃人工脱矿液内脱矿72 h,用扫描电镜观察脱矿后釉质表面的平滑情况,用显微硬度仪测量脱矿后釉质的显微硬度.然后随机分为3组,每组10个.采用pH循环法模拟人口腔环境,将3组标本分别浸泡在生物活性玻璃溶液、氟化钠溶液及人工唾液内,3次/d,10 min/次,循环浸泡20 d,扫描电镜检测标本脱矿及再矿化情况,用显微硬度计检查牙釉质显微硬度.结果与结论:浸泡在生物活性玻璃溶液中的牙釉质表面较浸泡在其他两溶液中的牙釉质表面光滑平整,无空隙存在;浸泡在生物活性玻璃溶液中的牙釉质表面显微硬度高于浸泡在其他两溶液中的牙釉质表面显微硬度(P <0.05).说明生物活性玻璃在体外实验中能促进早期釉质龋的再矿化.     

正畸治疗中牙釉质脱矿的预防研究

目的 对比研究固定矫治中牙釉质脱矿的发生，及局部应用氟化物的预防作用。方法 选择正畸需拔除的第一双尖牙72颗，分为6组：A组拔牙后不作处理；B组拔牙后常规酸蚀；C组拔牙后常规酸蚀，再用氟化泡沫处理；D组常规钻接托槽4周后拔牙；E组氯化泡沫处理后钻接托槽4周后拔牙；F组钻托槽后每日用0．05％NaF溶液漱口4周后拔牙。在扫描电镜下观察各实验区釉质表面的超微结构。结果 A组；正常釉质表面结构致密均匀轻微起状。B组；釉质表面呈蜂窝状。C组：釉质表面凹陷内有大量球形反应物存在。D组：牙釉质表面凹凸不平，有不规则的坑状结构。E组、F组：牙釉质表面均质平坦密度接近正常，凹陷表浅分布均匀。结论 (1)固定矫治钻接托槽会引起釉质表面脱矿。(2)釉质酸蚀面用氖化泡沫处理后再粘接托槽，与钻接托槽后每天用0．05％的NaF溶液漱口，能有效预防固定矫治过程中的脱矿。     

人釉成熟蛋白诱导下的釉质原位晶体生长

目的研究釉成熟蛋白(amelotin)在牙体原位对牙釉质再矿化的诱导能力。方法从釉质发育期第三磨牙牙囊中提取牙胚细胞总RNA,反转录、扩增得到釉成熟蛋白c DNA。使用限制性内切酶剪切得到釉成熟蛋白全长基因,将其与p MD18-T载体相连构建质粒,以大肠杆菌BL21(DE3)感受态细胞表达得到釉成熟蛋白。将2 mg/ml的釉成熟蛋白涂布于处理后的牙釉质表面,过饱和矿化液中37℃孵育14天,扫描电子显微镜观察新生矿物结晶。结果釉成熟蛋白能在脱矿釉质表面诱导生成珠状晶体,它们首尾相接排列成串状小棒,相互平行的小棒垂直于脱矿釉面向外延伸生长。结论相互平行的串珠棒状晶体模拟了平行排列的釉柱,特征串珠结构证实釉成熟蛋白在釉质生长过程中的重要作用。     

酪蛋白磷酸肽-磷酸钙溶液对牙釉质再矿化的影响

背景:酪蛋白磷酸肽-磷酸钙的作用时间和效力均强于普通只含钙磷的再矿化液,实验室及人体研究证明其能使牙釉质缺损再矿化,但研究多集中于釉质表面的微脱矿.目的:拟通过酸蚀剂处理形成不同深度的釉质表面脱矿形态,观察酪蛋白磷酸肽-磷酸钙溶液对牙釉质再矿化的影响.设计、时间及地点:对照观察实验,于2008-05/07在兰州大学口腔医院完成.材料;离体牙釉质块收集于兰州大学口腔医院外科门诊需拔除的正畸上颌第一前磨牙20个.方法:选取需拔除的正畸上颌第一前磨牙20个,随机分为2组,每组10个,分别用35%磷酸凝胶、20%磷酸凝胶对牙冠颊、腭面酸蚀处理60s,每颗牙牙冠沿近远中向纵剖,一半置于酪蛋白磷酸肽-磷酸钙再矿化液中矿化10d,另一半作为对照置于去离子水中.比较两种材料酸蚀及再矿化后的形态改变.主要观察指标:扫描电镜观察牙釉质表面在酸蚀后和酪蛋白磷酸肽-磷酸钙液再矿化后的表面形态改变.结果:采用35%磷酸凝胶、20%磷酸凝胶酸蚀后形成深、浅两种不同釉质酸蚀表面结构,呈鱼鳞状,经酪蛋白磷酸肽-磷酸钙再矿化液处理后酸蚀釉质表面都有大量的矿化物沉积,颗粒细小,沉积不均匀,逐渐变平,两种结构间无明显区别.结论:实验表明酪蛋白磷酸肽-磷酸钙可促进脱矿釉质再矿化,再矿化程度与釉质表面形态无关.     

没食子对牙釉质矿化作用的体外实验研究

目的研究没食子对牙釉质的矿化作用,探讨没食子防龋的临床价值。方法应用离体牛牙制备人工釉质龋标本120颗,随机分为脱矿组和再矿化组各60颗,每组再分为氟化钠组、没食子组、去离子水组各20颗,分别进行脱矿和再矿化实验,行光敏荧光技术及扫描电镜检查,比较各组脱矿后及再矿化后荧光量及扫描电镜结果。结果荧光结果显示,在脱矿及再矿化实验中,没食子组和氟化钠组药物作用前后荧光量的比值比较差异无统计学意义(P>0.05),与去离子水组比较差异均有统计学意义(P<0.05);扫描电镜显示,没食子组和氟化钠组牙面均有颗粒附着,效果接近,去离子水组牙面无颗粒附着。结论没食子对离体牙釉质有再矿化、抗酸脱矿作用,对预防龋病发生有一定作用。     

局部运用氟制剂抑制牙骨质脱矿的研究

目的 评估体外脱矿环境中几种氟制剂对牙骨质的脱钙作用.方法 将15颗因正畸拔出的前磨牙在牙根颈1/3预备出面积为3 mm×4 mm的牙骨质块作为实验区,其余部分涂两层指甲油后,按随机数字表法分为3组,每组5颗.0.1%氟保护漆组用0.1%氟保护漆于实验区涂布两层;0.6%氟化泡沫组用0.6%的氟化泡沫处理4 min;空白对照组用去离子水处理4 min.将已处理的标本牙分别浸泡于8 Ml 0.1 mol·L-1的人工龋蚀液中,分别在第1、3、6、12、24、48、72、168小时各吸取1 Ml液体,检测龋蚀液中Ca2+浓度值,计算出每组在各时间点牙本质钙溶出的总量.结果 0.1%氟保护漆能有效抑制牙骨质脱钙,而0.6%氟化泡沫对防止牙骨质脱钙无明显效果.结论 氟保护漆抑制牙骨质脱钙作用显著.     

氟化物在正畸釉质黏结剂中的应用

背景:釉质脱矿是固定矫治技术中常见的并发症,氟化物的应用可以抑制釉质脱矿的发生并促进釉质再矿化。目的:了解氟化物预防釉质脱矿的可能机制和在釉质黏接剂中的应用,降低正畸过程中釉质脱矿后白斑的发生。方法:以"fluoride release,enamel demineralization,enamel adhesive,orthdontics treatment"为检索词,检索PubMed数据库(1990-01/2010-08);以"正畸治疗;牙釉质脱矿;氟化物"为检索词,检索中国期刊全文数据库(1990-01/2010-08)。文献检索语种限制为英文和中文。纳入与释氟黏接材料研制及临床应用研究相关内容。结果与结论:氟通过置换羟磷灰石晶胞部分羟基,使磷灰石的结晶性、稳定性和硬度得到增强。氟离子可以和唾液中的钙、磷离子共同组成矿化系统发挥促进脱矿釉质再矿化的作用。研制含有缓释氟源的树脂黏接剂是预防釉质脱矿的一个重要方向,含有无机和有机缓释氟源的树脂黏接剂的释氟效果已得到验证,其临床使用效果有待进一步研究。     

氟化物在正畸釉质黏结剂中的应用

背景：釉质脱矿是固定矫治技术中常见的并发症,氟化物的应用可以抑制釉质脱矿的发生并促进釉质再矿化。目的：了解氟化物预防釉质脱矿的可能机制和在釉质黏接剂中的应用,降低正畸过程中釉质脱矿后白斑的发生。方法：以＂fluoride release,enamel demineralization,enamel adhesive,orthdontics treatment＂为检索词,检索PubMed数据库（1990-01/2010-08）;以＂正畸治疗;牙釉质脱矿;氟化物＂为检索词,检索中国期刊全文数据库（1990-01/2010-08）。文献检索语种限制为英文和中文。纳入与释氟黏接材料研制及临床应用研究相关内容。结果与结论：氟通过置换羟磷灰石晶胞部分羟基,使磷灰石的结晶性、稳定性和硬度得到增强。氟离子可以和唾液中的钙、磷离子共同组成矿化系统发挥促进脱矿釉质再矿化的作用。研制含有缓释氟源的树脂黏接剂是预防釉质脱矿的一个重要方向,含有无机和有机缓释氟源的树脂黏接剂的释氟效果已得到验证,其临床使用效果有待进一步研究。     

Varnish XT和ICON渗透树脂对釉质龋白斑微硬度的影响

背景：早期龋的治疗方法中,可以采用氟化物对龋白斑进行再矿化处理。长效释氟玻璃离子保护膜（Varnish XT）和ICON渗透树脂是两种新型的材料,Varnish XT是一种新型的树脂加强型玻璃离子,可以作为再矿化材料的新选择。ICON渗透树脂是一种流动性较好的高渗透系数树脂,借助毛细作用渗入到脱矿釉质的微孔中,利用低黏性的渗透树脂取代由于脱矿而丧失的硬组织并占据微孔的空间,填补釉质脱矿区并阻止病损的进一步发展。目的：观察Varnish XT和ICON渗透树脂两种微创治疗材料对釉质龋白斑微硬度的影响。方法：选择牛门齿100颗,将唇面向下作为观察面,环氧树脂包埋,打磨。暴露至少6 mm×10 mm的釉质牙面,由切端至颈部依次分A,B,C,D,E 5个区,E区用抗酸指甲油封闭。分别采用人工龋脱矿液后,A区不做处理,B区经Varnish XT处理,C区经ICON渗透树脂处理,D区经氟化物处理后,用韦氏硬度仪测量表面显微硬度值。结果与结论：脱矿样本经处理后A,B,C,D区的表面显微硬度值较E区均明显降低（P 〈0.05）, B,C,D区样本表面显微硬度值均较A区升高,且表面显微硬度值C区〉B区、D区（P 〈0.05）;B区的表面显微硬度值与D区相比,差异无显著性意义（P 〉0.05）。说明ICON渗透树脂、Varnish XT和氟化物对龋白斑的微硬度都有明显的改善,ICON渗透树脂的改善较Varnish XT和氟化物明显,Varnish XT和氟化物之间无明显差异。     

Study on acid resistance of human dental enamel and dentin irradiated by semiconductor laser with Ag(NH3)2F solution

OBJECTIVE: The purpose of this study was to investigate the acquired acid resistance of human dental enamel and dentin treated by 38% diamine silver fluoride [Ag(NH3)2F] solution and semiconductor (diode) laser irradiation in vitro. BACKGROUND DATA: There have been no reports on the acid-resistant effect by combined use of fluoride and semiconductor laser. METHODS: Sixty crowns of extracted human molars were divided into two groups for enamel and dentin samples, and each group was subdivided into three subgroups of 10 each. Each subgroup of enamel and dentin samples served as a control; one was treated with Ag(NH3)2F and the other was treated with Ag(NH3)2F and semiconductor laser irradiation at 2 W for 30 sec. Then all samples were immersed in 5 ml of 0.1 M lactic acid (pH 4.8) at 37 degrees C for 24 h. The concentration of calcium ion (Ca2+) dissolved in the solution was measured by atomic absorption spectrophotometry, and the samples were observed by stereoscopy and scanning electron microscopy (SEM). RESULTS: In both enamel and dentin samples, dissolved Ca2+ concentration in Ag(NH3)2F- or Ag(NH3)2F- and laser-treated group was significantly decreased compared with that in the control (p < 0.01). SEM findings showed that numerous cubic particles ranging from 0.1 to 0.5 mcirom were observed only in the combined treated groups of both enamel and dentin samples. CONCLUSIONS: A significantly decreased solubility of human enamel and dentin was acquired after treatment by Ag(NH3)2F and semiconductor laser irradiation, which suggested that this combined use has the capability of a more efficient acid-resistant effect on human dental hard tissues.     

A statherin-derived peptide promotes hydroxyapatite crystallization and in situ remineralization of artificial enamel caries

In situ remineralization of hydroxyapatite on a human tooth enamel surface induced by anti-caries bioactive components is an alternative restorative strategy against dental caries. In this study, a novel biomimetic peptide DE-11, inspired by the salivary phosphoprotein statherin, was developed, and it showed beneficial potentials for the restoration of demineralized tooth enamel in vitro. The peptide DE-11 contained the initial six-peptide sequence of N-terminus of statherin extended by a mineralization hydrophilic tail composed of consecutive acidic amino acids capable of adsorbing calcium and phosphate ions. A strong adsorption capacity of DE-11 to hydroxyapatite was confirmed through Langmuir adsorption isotherm experiment and confocal laser scanning microscopy. Then, the nucleation and crystallization of hydroxyapatite due to DE-11 was characterized by scanning and transmission electron microscopy and selected-area electron diffraction. Moreover, the ability of DE-11 to promote the remineralization of initial enamel caries lesions was further evaluated. Initial lesions were created in bovine enamel blocks, which were then exposed to the peptide solution and finally immersed in artificial saliva. After 7 days, a higher percentage of surface microhardness recovery, a lower mineral loss, a shallower lesion depth, and a higher mineral content were found on the surface of the lesion body in the DE-11 group as compared to that in the negative group using surface microhardness testing, polarized light microscopy, and transverse microradiography; this indicated that DE-11 could induce in situ remineralization of hydroxyapatite on the demineralized enamel surface. Overall, these findings suggest that DE-11 is highly promising as a restorative biomaterial for enamel remineralization in the anti-caries applications.

A novel biomimetic peptide inspired by salivary statherin was developed and exhibited beneficial potentials in promoting remineralization of hydroxyapatite on tooth enamel surface, providing a desirable alternative restorative strategy against dental caries.     

中国局部用氟预防正畸治疗中牙釉质脱矿的系统评价

目的 系统评价我国局部用氟预防正畸治疗中牙釉质脱矿的效果.方法 计算机检索The Cochrane Library(2012年第9期)、MEDLINE (1996～2012.10)、EMbase (1974～2012.10)、CNKI (1994 ～ 2012.10)、VIP(1994 ～ 2012.10)、WanFang Data (1998～2012.10)和CBM (1978～2012.10),纳入关于我国局部用氟预防正畸治疗中牙釉质脱矿的随机和半随机对照试验,同时追溯纳入文献的参考文献.由2位研究者独立对纳入研究的质量进行严格评价和资料提取,而后采用RevMan 5.2软件进行Meta分析.结果 共纳入19篇文献(20个研究),包括26 323颗牙齿.Meta分析结果显示:氟保护漆组的牙釉质脱矿率(8.4％)低于对照组(16.0％)[OR=0.44,95％CI(0.33,0.59),P＜0.00001];局部涂氟组的牙釉质脱矿率(8.3％)低于对照组(17.7％)[OR=0.46,95％CI (0.35,0.60),P<0.000 01];含氟牙膏组的牙釉质脱矿率(9.0％)低于对照组(14.5％)[OR=0.59,95％CI (0.49,0.71),P＜0.000 01];含氟泡沫组的牙釉质脱矿率(11.6％)低于对照组(18.2％) [OR=0.48,95％CI (0.24,0.96),P=0.04];其他方式组的牙釉质脱矿率(12.0％)低于对照组(21.8％) [OR=0.43,95％CI (0.30,0.60),P＜0.000 01].2个结局的GRADE系统推荐分级为低等级,3个为极低等级.结论 国内现有研究显示,局部用氟可以达到预防正畸治疗中牙釉质脱矿的效果,但由于纳入研究的方法学质量较低,本研究结果的可靠性尚需开展更多设计严谨的高质量、大样本的研究予以证实.     

Effect of long-term administration of fluoride on physico-chemical properties of the rat incisor enamel.

Rats were maintained on drinking water containing different amounts of fluoride (0, 9, 23 45, 68, and 113 ppm) for 70 days. Physico-chemical properties of the incisor enamel were examined after fluoride administration, using contact microradiography, histochemistry, and microhardness tests. The tooth enamel formed during high fluoride exposure showed marked hypocalcification. Much of organic substance in the enamel seemed to have been retained. In addition, the microhardness of enamel showed a marked decrease. These changes were most prominent in the outer region of enamel and were proportional to the concentration of fluoride administered. Such changes following fluoride administration indicated inhibition of enamel maturation, i.e., an inhibition of the progressive depposition of minerals and/or in inhibition of organic matrix withdrawal by ameloblasts. Enamel seemed more affected by fluoride than dentine.     

Automated assessment of the remineralization of artificial enamel lesions with polarization-sensitive optical coherence tomography

Accurate measurement of the highly mineralized transparent surface layer that forms on caries lesions is important for diagnosis of the lesion activity because chemical intervention can slow or reverse the caries process via remineralization. Previous in-vitro and in-vivo studies have demonstrated that polarization-sensitive optical coherence tomography (PS-OCT) can nondestructively image the subsurface lesion structure and the highly mineralized transparent surface zone of caries lesions. The purpose of this study was to develop an approach to automatically process 3-dimensional PS-OCT images and to accurately assess the remineralization process in simulated enamel lesions. Artificial enamel lesions were prepared on twenty bovine enamel blocks using two models to produce varying degree of demineralization and remineralization. The thickness of the transparent surface layer and the integrated reflectivity of the subsurface lesion were measured using PS-OCT. The automated transparent surface layer detection algorithm was able to successfully detect the transparent surface layers with high sensitivity ( = 0.92) and high specificity ( = 0.97). The estimated thickness of the transparent surface layer showed a strong correlation with polarized light microscopy (PLM) measurements of all regions (R² = 0.90). The integrated reflectivity, ΔR, and the integrated mineral loss, ΔZ, showed a moderate correlation (R² = 0.32). This study demonstrates that PS-OCT can automatically measure the changes in artificial enamel lesion structure and severity upon exposure to remineralization solutions.OCIS codes: (170.4500) Optical coherence tomography, (170.1850) Dentistry, (170.0110) Imaging systems     

Effect of Er:YAG laser on CaF2 formation and its anti-cariogenic action on human enamel: an in vitro study

OBJECTIVE: The objective of this study was to evaluate the effect of Er:YAG laser on the formation of CaF(2), after the application of acidulated phosphate fluoride (APF), and its influence on the anti-cariogenic action in human dental enamel. BACKGROUND DATA: Er:YAG laser was designed to promote ablation of the enamel. However, the possibility of using this energy to increase the enamel's resistance to caries has hardly been explored, and neither has its interaction with the use of fluorides. MATERIALS AND METHODS: One hundred and twenty blocks of enamel were allocated to four groups of 30 blocks each: (1) C, control group; (2) Er:YAG, laser; (3) APF; and (4) Er:YAG+APF. Of these, 80 blocks were submitted to pH cycling for 14 days. In the other 40 blocks, fluoride (CaF(2)) was measured before cycling. After pH cycling, surface microhardness (SMH), microhardness in cross-section (converted to mineral contents % vol. min.), and fluoride after cycling (40 blocks) were also determined. RESULTS: SMH decreased in all groups. The control group showed the highest decrease, and Er:YAG+APF showed the lowest decrease (p < 0.05). Groups APF and Er:YAG showed the same results (p > 0.05). Mineral content at depths 10, 20, and 40 microm was lower in the control and Er:YAG groups, and higher in groups APF and Er:YAG+APF. CaF(2) (microgF/cm(2)) deposited before pH cycling was higher in the APF group when compared to the Er:YAG+APF group. Control and Er:YAG groups showed the lowest values (p > 0.05). CONCLUSION: It was concluded that Er:YAG laser influenced the deposition of CaF(2) on the enamel and showed a superficial anti-cariogenic action, but not in depth.