4种牙色充填材料与乳牙粘结强度的比较研究

目的：比较4种牙色充填材料与乳磨牙的剪切粘结强度,为临床应用提供理论依据。方法：选用滞留乳磨牙80颗,随机分成8组,分别用复合树脂、多聚酸改良复合树脂、树脂改良玻璃离子、玻璃离子及相对应的酸蚀粘结剂或齿面处理剂按使用说明制作牙釉质和牙本质粘结试件,测定其剪切强度,并在体视显微镜下观察试件断面界面破坏情况。结果：4种牙色材料的剪切强度牙釉质组均明显高于牙本质组,复合树脂与多聚酸改良复合树脂组牙质剪切粘结强度无统计学差异,其它任意两组之间均有高度统计学差异。结论：复合树脂与多聚酸改良复合树脂牙质粘结强度无明显差别,均高于玻璃离子和树脂改良玻璃离子,以玻璃离子粘结强度最低。     

粘结剂使用方式对全酸蚀树脂水门汀与牙本质粘结性能影响的研究

目的评价粘结剂的3种不同使用方式（不使用粘结剂,粘结剂不固化及粘结剂固化10 s）对全酸蚀树脂水门汀与牙本质间粘结性能的影响。方法新鲜拔除的无龋人第三磨牙45颗,随机分为9组（n=5）,流水降温下磨除冠部牙釉质,制备标准牙本质粘结面,酸蚀冲洗后表面按全酸蚀粘结技术处理,牙本质粘结剂处理方式按设计进行,然后与3种全酸蚀树脂水门汀（Rely X ARC、Calibra、VariolinkⅡ）粘结并测试微拉伸粘结强度,用扫描电镜观察粘结界面。结果对于3种全酸蚀树脂水门汀,不使用粘结剂组未测得粘结强度;粘结剂不固化组及粘结剂固化10 s组均获得较为满意的粘结强度,不固化组的微拉伸粘结强度（15.534±2.099;22.827±6.968;10.736±3.199）显著高于粘结剂固化10 s组（13.476±2.710;14.076±5.165;7.736±3.052）（P〈0.05）。结论①全酸蚀树脂水门汀应结合粘结剂同时使用。②牙本质涂布粘结剂后不单独固化可显著提高全酸蚀树脂水门汀与牙本质的粘结强度。     

全酸蚀与自酸蚀粘结系统与正常牙本质粘结强度的比较

目的本研究选取了3种知名品牌的全酸蚀和自酸蚀粘结剂,比较其与正常牙本质的粘结强度及相同品牌树脂粘结剂与不同品牌树脂粘结剂的粘结强度。方法选择60颗新鲜拔除的人第三磨牙,去除牙合面釉质层,随机分为12组,选用3种品牌全酸蚀和自酸蚀粘结剂Excite、AdheSE;Prime&BondNT、XenoⅢ;Singlebond2、Adper Prompt,分别应用于暴露的表层牙本质上,再用树脂恢复牙冠。将牙齿片切成横截面积约为1mm2的长方体状样本,检测其粘结强度。结果结果显示Excite与AdheSE、Prime&Bond NT与XenoⅢ、Singlebond2与Adper Prompt之间的粘结强度无显著差异(P>0.05),Prime&Bond NT、Singlebond2与TPH树脂,XenoⅢ、Adper Prompt与TPH树脂粘结强度无显著差异(P>0.05);Prime&Bond NT、Singlebond2与Z-250树脂,XenoⅢ、Adper Prompt与Z-250树脂粘结强度无显著差异(P>0.05)。结论全酸蚀/自酸蚀粘结系统与正常牙本质间的粘结强度无显著差异;不同品牌间的粘结剂和树脂一起应用不影响其粘结强度。     

酪蛋白磷酸多肽钙磷复合体的应用顺序对乳牙牙本质粘结强度的影响

目的探讨酪蛋白磷酸多肽钙磷复合体(casein phosphopetide-amorphic calcium phosphat, CPP-ACP)应用顺序对乳牙牙本质粘结强度及对乳牙牙本质小管封闭作用的影响。方法选取人56颗无龋乳磨牙,磨除牙合面釉质,制备牙本质平面。将其中48颗乳磨牙随机分3大组(n=16)。A组:仅酸蚀15 s。B组:涂CPP-ACP后酸蚀15 s。C组:酸蚀15 s后涂CPP-ACP。各组分为2小组(n=8),其中AN,BN,CN组使用Prime&Bond NT(NT)全酸蚀粘结剂,AS,BS,CS组使用Single bond 2(SB2)全酸蚀粘结剂。制作树脂粘结试件,电子万能试验机测定剪切强度(SBS值)。其余8个乳磨牙随机分成4组(n=2),分别为空白组(S1组)、酸蚀组(S2组)、酸蚀后涂CPP-ACP组(S3组)、涂CPP-ACP后酸蚀组(S4组)分别用扫描电镜观察粘结前牙本质小管封闭情况。结果剪切实验结果为AN组、BN组、CN组剪切强度无统计学差异(P>0.05);AS组,BS组,CS组剪切强度也无统计学差异(P>0.05);AN组>AS组,BN组>BS组,CN组>CS组差异有统计学意义(P<0.05)。扫描电镜结果为S3组中牙本质小管封闭数目最多。结论在酸蚀后应用CPP-ACP处理乳牙牙本质不影响NT和SB2两种全酸蚀粘结剂的粘结强度;可以达到有效的牙本质小管封闭;Prime&Bond NT(NT)全酸蚀粘结系统的粘结强度高于Single bond 2(SB2)。     

ErCr:YSGG激光对牙本质界面粘结强度及形态结构的影响

目的：研究ErCr:YSGG激光在不同粘结机理作用下对牙本质黏结剂黏结强度和微观形态的影响。方法：20颗完整无龋的人第三磨牙,去除咬合面釉质,随机分为4组 (n=5)：第1组：激光预备+全酸蚀粘结剂;第2组：常规预备+全酸蚀粘结剂;第3组：激光预备+自酸蚀粘结剂;第4组：常规预备+自酸蚀粘结剂。复合树脂粘结至牙面制成1.0mm*1.0mm*10mm长方体试样,微拉伸测试黏结强度并进行统计学分析。体视显微镜下观察断裂类型,每组随机选取2个断裂前样本及粘结前样本行扫描电镜观察。另4颗分为2组（n=2）分别做激光预备和常规预备后电镜观察粘结前界面。 结果：黏结强度第4组最低（12.37±3.12Mpa）,与其它3组有统计学差异（P<0.01）,其他3组间无统计学差异（P>0.05）;断裂类型多为黏结剂断裂的混合破坏,各组断裂类型间无统计学差异(P>0.05);扫描电镜观察第1-3组混合层薄而致密,树脂突长而粗,第4组混合层不均一,树脂突短而细。水激光预备样本的牙本质小管开放,牙本质表面清洁、无热损伤痕迹。常规预备样本的牙本质小管封闭,表面玷污层较厚。 结论：ErCr:YSGG激光可显著提高自酸蚀粘结剂的粘结强度。     

酸蚀时间对再矿化牙本质粘结强度影响的研究

目的选取全酸蚀和自酸蚀粘结剂,比较再矿化牙本质在不同酸蚀时间下的粘结强度,为临床上更恰当掌握酸蚀时间提供一定的理论指导。方法选择40颗牙合面慢性龋病达牙本质中层的磨牙,去除病变累及的软化牙本质,保留再矿化牙本质。平行于牙体长轴将牙齿切为3份,分别用35%Gluma酸蚀剂(或处理剂)酸蚀20、40、60 s。选用全酸蚀和自酸蚀牙本质粘结剂分别用于牙本质,树脂恢复牙冠。用低速锯将牙齿片切成横截面积约为1 mm2的长方体状样本,所有样本先在体视显微镜下观察,区分正常牙本质和再矿化牙本质,用微拉伸测试仪检测其粘结强度。结果再矿化牙本质其40 s组的微拉伸强度高于20 s组及60 s组(P<0.05),而60 s组与20 s则无显著差异(P>0.05)。结论酸蚀时间对再矿化牙本质的粘结强度有影响,对再矿化牙本质的酸蚀时间应适当延长。     

3种自酸蚀粘结剂粘结托槽的剪切强度比较

目的:比较3种自酸蚀粘结剂粘结正畸托槽时的剪切粘结强度。方法:将36颗人前磨牙随机均分为3组,分别用3种自酸蚀粘结剂:改良一步法自酸蚀粘结系统Adper Prompt L-Pop Self Etch Adhesive(组1)、释氟抗菌型自酸蚀粘结系统Clearfil Protect Bond(组2)、释氟型自酸蚀粘结系统Transbond Plus Self Etching Primer(组3)粘结金属托槽,用万能应力测试机测试其剪切粘结强度,在体式显微镜下评价各组牙齿表面的剩余粘结剂指数,并进行统计学分析。结果:单因素方差分析显示各组间的剪切粘结强度有显著性差异(P<0.05),组2的剪切粘结强度最高,组1和组3间的剪切粘结强度差异无统计学意义。Kruskal-Wallis检验表明各组的剩余粘结剂指数无差别(P>0.05)。结论:3种自酸蚀粘结剂粘结托槽的剪切粘结强度存在一定的差异,但均能满足正畸临床治疗的需求。     

三种一步法自酸蚀粘结剂对复合树脂粘结修复后微渗漏的影响

目的:探讨3种一步法自酸蚀粘结剂对复合树脂粘结修复后微渗漏的影响.方法:取正畸治疗拔除的正常前磨牙105个,在每个牙的颊侧颈部制备4 mm ×2 mm ×2.5 mm的窝洞后,随机分为A1组(磷酸预处理后自酸蚀Clearfil S3 Bond)、A2组(自酸蚀Clearfil S3 Bond)、B1组(磷酸预处理后自酸蚀Beautibond)、B2组(自酸蚀Beautibond)、C1组(磷酸预处理后自酸蚀Hybrid Coat)、C2组(自酸蚀Hybrid Coat)和D组(全酸蚀Prime&Bond NT).粘结和复合树脂充填后冷热循环处理;亚甲蓝溶液染色24h.然后将各牙沿颊舌向通过充填体中央纵行剖开,体视显微镜下观察充填体边缘的染色情况并进行分级;SEM观察粘结界面形貌.结果:A2、B2、C2组间微渗漏值比较P＞0.05,但均小于D组;A2、B2与D组相比P＜0.05;C2与D组比较P＞0.05.A1、B1、C1组间微渗漏值比较P＞0.05,但均小于D组(P＜0.05).A1与A2、B1与B2相比P＞0.05;而C1组微渗漏值小于C2组(P＜0.05).SEM观察显示,3种自酸蚀粘结剂均与牙体组织、树脂结合严密均匀.结论:3种一步法自酸蚀粘结剂边缘封闭性均良好,磷酸预处理釉质可减少Hybrid Coat自酸蚀粘结剂的微渗漏.     

四种常用牙本质粘结剂的边缘封闭性比较

目的对比研究四种临床常用牙本质粘结剂的边缘封闭性能.方法在20个离体人恒磨牙颊、舌侧牙颈部各制备3 mm×2 mm×2 mm的箱型V类洞.制备的窝洞随机分为4组,分别以全酸蚀粘结剂Prime&BondNT和Single Bond,自酸蚀粘结剂Adper Prompt和Clearfil SE Bond粘结,Charisma复合树脂充填.0.5%碱性品红溶液中染色24 h后,将充填体连续纵向剖开为四部分,体视显微镜下观察各剖面充填体边缘的微渗漏情况,并以扫描电镜观察树脂-牙本质界面的结合状态.结果各种粘结剂均存在微渗漏现象,龈方微漏程度显著高于冠方(P＜0.05).各种粘结剂之间的微漏程度无显著性差异(P＞0.05).电镜下各组界面均存在散在间隙,全酸蚀粘结剂形成的混合层较自酸蚀者厚,树脂突亦较长.结论多剖面评分法较常规正中剖面法能更全面地评价界面的微漏情况;各种粘结剂均不能完全消除充填体边缘微漏.     

CPP-ACP/ACFP预处理的牙本质与树脂粘结剂粘结作用的研究

目的:通过设立对比实验,研究酪蛋白磷酸肽-无定形磷酸钙(Casein phosphopetide-amorphic calcium phosphat,CPP-ACP)及酪蛋白磷酸肽-无定形磷酸氟钙(Casein phosphoetide-amorphic calcium fluoride phosphate complexes,CPP-ACFP)对牙本质小管的封闭效果及对树脂粘结剂粘结强度的影响。方法:将36个试件随机分为自酸蚀和全酸蚀组,每组再分空白组、GC组、GC plus组3个亚组(n=6)。采用扫描电子显微镜(SEM)观察CPP-ACP和CPP-ACFP预处理牙本质1 d和7 d后的表面形貌改变;用能谱分析,计算钙磷比值,分析羟基磷灰石晶体结构和成份;每个试件上均堆积厚约4 mm的Z350树脂,通过万能测试机进行微拉伸强度测试,分析CPP-ACP和CPP-ACFP预处理对粘结剂粘结强度的影响;使用体视显微镜,观察界面的断裂模式,并对结果进行统计分析。结果:SEM显示,经预处理的牙本质小管直径减小,经多次预处理与1次相比,牙本质小管几乎完全封闭;能谱分析表明经预处理的牙本质与空白组牙本质Ca∶P比值变化并无统计学差异,新形成的羟基磷灰石结构和成份与牙本质类似;微拉伸实验结果显示,在牙本质表面应用CPP-ACP或CPP-ACFP后,可降低全酸蚀粘结剂single bond2的粘结强度(P＜0.05),而对自酸蚀粘结剂ibond的粘结强度无明显影响;两者对同一种粘结剂粘结强度的影响无统计学意义;体视显微镜观察,各组断裂模式均以粘结面断裂为主。结论:粘结前使用CPP-ACP或CPP-ACFP预处理牙本质表面,可以封闭牙本质小管,多次应用效果更加显著;CPP-ACP或CPP-ACFP预处理后对自酸蚀粘结剂粘结强度没有影响;会降低全酸蚀粘结剂的粘结强度。     

Microtensile bond strength of a total-etching versus self-etching adhesive to caries-affected and intact dentin in primary teeth

BACKGROUND: The objec tives of this study were to determine microtensile bond strengths of two dentin adhesives and to compare the micromorphological structure of the resin/dentin interface in caries-affected dentin with that of intact dentin. METHODS: The authors randomly divided 40 proximal dentinal carious primary teeth and 40 noncarious anterior primary teeth into two groups (self-etching and total-etching). They used a caries-detecting dye as an indicator of the need to remove the outer carious dentin. The authors restored the teeth with a hybrid resin-based composite. After 24 hours' storage in 37 C water, specimens were sectioned and shaped to form a curved section with a cross-sectional area of 1 square millimeter, then tension was applied until they fractured. The authors prepared the resin/dentin interfaces for the two bonding systems and examined them in 10 occlusal carious and 10 noncarious teeth. STATISTICAL ANALYSIS: The bond strengths for intact and caries-affected dentin within the same group were analyzed via a t test. The authors compared the remaining dentin thickness (RDT) and dentin hardness using analysis of variance and the least significant difference test at the .05 level of significance. RESULTS: The self-etching adhesive demonstrated no statistical difference in bond strength between intact and caries-affected dentin. However, the total-etching adhesive demonstrated different bond strengths for intact and caries-affected dentin. Moreover, the RDT of specimens with intact and caries-affected dentin was not significantly different, whereas the dentin hardness of caries-affected dentin was significantly lower than that of intact dentin. The authors found a thicker hybrid layer in intact and caries-affected dentin of specimens in the total-etching group. CONCLUSION: The adhesives exhibited significantly different bond strengths in intact dentin of primary teeth. However, they exhibited similar bond strengths in caries-affected dentin.     

自酸蚀与全酸蚀粘接剂对牙釉质和牙本质的剪切粘接强度比较

目的 比较自酸蚀与伞酸蚀粘接剂对牙釉质和牙本质剪切粘接强度,以期为临床提供参考.方法 选择因牙周病拔除的上颌中切牙20颗,使用两种自酸蚀粘接剂[A(ClearfilTM Protect Bond)、B(AdporTM PromptTM)]和两种全酸蚀粘接剂[C(SwissTEC SL Bond)、D(Single Bond)]按照厂家推荐步骤对牙釉质和牙本质进行粘接,并测试牙釉质和牙本质粘接样本的剪切粘接强度.结果 4种粘接剂对牙釉质和牙本质粘接强度分别为:粘接剂A(25.33±2.84)、(26.07±5.56)MPa;粘接剂B(17.08±5.13)、(17.93±4.70)MPa;粘接剂C(33.14±6.05)、(41.92±6.25)MPa;粘接剂D(22.51±6.25)、(21.45±7.34)MPa.粘接剂C对牙釉质和牙本质剪切粘接强度显著高于其他3种粘接剂(P<0.05);粘接剂B的剪切粘接强度显著低于其他3种粘接剂(P<0.05).结论 本研究所选用的自酸蚀两步法粘接剂的剪切粘接强度与部分伞酸蚀粘接剂相当,高于自酸蚀一步法粘接剂.     

牙齿漂白剂对正畸托槽粘接强度的影响

目的:评价三种牙齿漂白剂对自酸蚀粘接系统粘接正畸托槽粘接强度的影响。方法:将100颗人前磨牙均分为四组:空白对照组(组1)、38%过氧化氢漂白组(组2)、10%过氧化脲漂白组(组3)和20%过氧化脲漂白组(组4),漂白牙齿后即刻使用自酸蚀正畸粘接系统Transbond Plus SEP将托槽粘接在牙面上,测量各组的抗剪切粘接强度,评价其剩余粘接剂指数,对结果进行统计学分析。结果:空白对照组的抗剪切粘接强度高于各漂白组,组2的抗剪切粘接强度高于组3和组4,而组4的抗剪切粘接强度最低,其差异均具有统计学意义(P<0.05)。各组的剩余粘接剂指数差异均有统计学意义(P<0.05),剩余粘接剂指数最低者为空白对照组,最高者为20%过氧化脲组。结论:在使用自酸蚀粘接系统粘接正畸托槽前应禁止使用过氧化物漂白牙齿,特别是高浓度的过氧化脲。     

Bonding of lithium-disilicate ceramic to enamel and dentin using orthotropic fiber-reinforced composite at the interface

OBJECTIVE: To evaluate the effect of orthotropic fiber-reinforced composite (FRC) at the interface on bonding of lithium-disilicate ceramic to dentin and enamel using different adhesive systems. MATERIAL AND METHODS: Dentin and enamel surfaces were ground occlusally on human molar teeth. Ceramic blocks of IPS Empress 2 (Ivoclar-Vivadent) were fabricated. Following acid etching and silane treatment of the ceramics, the teeth were divided into two groups (dentin and enamel). Ceramic blocks were bonded to the tooth substance with or without a layer of FRC and dual-polymerizing composite cement (Duolink). Total-etching (etchant (Etch 37) with adhesive (One Step Plus)) and self-etching (self-priming etchant (Tyrian SPE) with adhesive (One Step Plus)) systems were used, with five test specimens in each group. The cement was polymerized with a LED curing unit (Elipar Freelight LED 2) with standard mode of 40 s. The specimens were thermocycled for 6000 cycles and tested with the microtensile tester at a rate of 5 mm/min. Fracture mode analyses were done by light microscope and with SEM. The data were analyzed using three-way analysis of variance (ANOVA). RESULTS: ANOVA showed that enamel had statistically significant (p<0.001) higher bond strength values than dentin. Bond strength values were significantly higher (p=0.012) with the total-etching system than with the self-etching system. The existence of FRC also had a minor effect on bond strength values (p=0.013). CONCLUSIONS: The enamel and total-etching system provided more reliable bonding than dentin and the self-etching system. Use of an FRC layer at the interface did not improve bond strength values, but instead changed fracture pattern behavior.     

The effect of thermocycling on the adhesion of self-etching adhesives on dental enamel and dentin

AIM: The aim of the present study was to investigate the effectiveness of one total-etch self-priming adhesive and two one-step self-etching adhesive systems on the adhesion of a resin composite to both dentin and enamel. The effect of thermocycling on the adhesion was also investigated. The null hypothesis tested was thermocycling would not affect bond strengths to enamel and dentin treated with self-etching adhesives or a total-etch adhesive. METHODS AND MATERIALS: Two single-step self-etching adhesives [Xeno III (XE3) and Prompt L-Pop (PP)] and one two-step total-etch adhesive system (Prime & Bond NT) (P&B NT) were used in this study. Thirty caries-free unrestored human third molars were used to make specimens of enamel and dentin. Different adhesives were applied on enamel and dentin surfaces according to the manufacturer's instructions then hybrid composite restorative material was condensed on the surface using a mold. The bonded specimens were stored in distilled water at 37 masculineC for 24 hours before being tested. Half of the bonded specimens were tested for shear bond strength without thermocycling. The other half of the test specimens were thermocycled using a thermocycling apparatus in water baths held at 5 masculineC and 55 masculineC with a dwell time of one minute each for 10,000 cycles prior to shear testing. The mean shear bond strength before and after thermocycling was calculated, and the results were subjected to two-way analysis of variance (ANOVA) and repeated measure design to show the interaction between different materials and different times. RESULTS: The results showed shear bond strength on both enamel and dentin of the total-etch adhesive and the self-etching adhesives decreased after the specimens were subjected to thermocycling. CONCLUSIONS: The null hypothesis tested "thermocycling would not affect bond strengths treated with self-etching adhesives" was rejected. Furthermore, the study revealed the following: 1. The shear bond strength to both enamel and dentin of the total-etch adhesive and the self-etching adhesives decreased after the specimens were subjected to thermocycling. 2. XE3 achieved the highest bond strength to both enamel and dentin (26.994+/-1.17 and 25.22+/-1.26, respectively). 3. XE3 showed even better bonding after thermocycling to enamel and dentin than the total-etching system or PP. 4. Although PP bonded to enamel showed lower shear bond strength value than XE3, it has durable bond strength even after thermocycling.     

Effective bond strength of current adhesive systems on deciduous and permanent dentin

PURPOSE: To evaluate the bond strength of a total-etching, self-priming system (Single Bond) and a self-etching system (Clearfil SE Bond) to deciduous and permanent human dentin. METHODS AND MATERIALS: Buccal dentin discs were prepared with a diamond disc from permanent first premolars, permanent third molars and deciduous second molars. The flat dentin surfaces were obtained by polishing with wet 600 grit silicon carbide papers. The specimens of each group were further divided into two groups for bonding to either Single Bond or Clearfil SE Bond. After 24 hours, the microshear bond strength testing was executed on a universal testing machine. Statistical analysis was performed at alpha = 0.05. RESULTS: No significant differences in bond strength were found between materials. However, deciduous dentin demonstrated significantly lower bond strengths than permanent premolar dentin when Single Bond was applied (p < 0.05). CONCLUSION: The difference in bonding substrate (permanent or deciduous dentin) had a significant effect on bond strength when the total-etching, self-priming system was applied.     

Bonding to enamel and dentin using self-etching adhesive systems.

OBJECTIVES: This study investigated the effectiveness of three different dentin adhesive systems on the adhesion of resin composite to both dentin and enamel. METHOD AND MATERIALS: The flat dentin and enamel surfaces of 60 extracted human molar teeth were exposed by wet grinding with 600-grit silicon carbide paper. One total-etch self-priming adhesive system (Prime & Bond NT), one two-step self-etching primer adhesive system (Clearfil SE Bond), and one "all-in-one" self-etching adhesive system (Prompt L-Pop) were evaluated. Each bonding system was applied according to the manufacturer's instructions and followed by composite (TPH Spectrum) application. Twenty-four hours after bonding, the teeth were subjected to shear testing. There were 10 replicates for each group. RESULTS: Prompt L-Pop exhibited significantly higher bond strength values to enamel (27 +/- 4.2 MPa) than all other groups. There were no statistically significant differences for shear bond strength to dentin among adhesives. Prompt L-Pop showed the statistically significantly higher bond strength to enamel than dentin. There were no statistically significant differences between the enamel and dentin bond strengths of Clearfil SE Bond and Prime & Bond NT. CONCLUSIONS: The self-etching adhesive systems produced high bond strengths to human coronal dentin and ground enamel surfaces. These materials seem to be very promising for further clinical applications, and the results are very encouraging for the clinical success of these simplified adhesive systems. The self-etching adhesive systems produced even better bond strengths to both enamel and dentin than conventional total-etch systems, especially the "all-in-one" system, which produced the highest bond strength to enamel.     

Bonding of lithium-disilicate ceramic to enamel and dentin using orthotropic fiber-reinforced composite at the interface

Objective. To evaluate the effect of orthotropic fiber-reinforced composite (FRC) at the interface on bonding of lithium-disilicate ceramic to dentin and enamel using different adhesive systems. Material and Methods. Dentin and enamel surfaces were ground occlusally on human molar teeth. Ceramic blocks of IPS Empress 2 (Ivoclar-Vivadent) were fabricated. Following acid etching and silane treatment of the ceramics, the teeth were divided into two groups (dentin and enamel). Ceramic blocks were bonded to the tooth substance with or without a layer of FRC and dual-polymerizing composite cement (Duolink). Total-etching (etchant (Etch 37) with adhesive (One Step Plus)) and self-etching (self-priming etchant (Tyrian SPE) with adhesive (One Step Plus)) systems were used, with five test specimens in each group. The cement was polymerized with a LED curing unit (Elipar Freelight LED 2) with standard mode of 40 s. The specimens were thermocycled for 6000 cycles and tested with the microtensile tester at a rate of 5 mm/min. Fracture mode analyses were done by light microscope and with SEM. The data were analyzed using three-way analysis of variance (ANOVA). Results. ANOVA showed that enamel had statistically significant (p<0.001) higher bond strength values than dentin. Bond strength values were significantly higher (p=0.012) with the total-etching system than with the self-etching system. The existence of FRC also had a minor effect on bond strength values (p=0.013). Conclusions. The enamel and total-etching system provided more reliable bonding than dentin and the self-etching system. Use of an FRC layer at the interface did not improve bond strength values, but instead changed fracture pattern behavior.     

FL-Bond自酸蚀黏结剂对暴露根面脱敏的临床疗效

目的 :评价 FL-Bond自酸蚀黏结剂对暴露根面脱敏的临床疗效。方法 :选择有牙齿感觉过敏症的根面暴露患者 69例 ,患牙 1 72个 ,随机分成 3组。 A组 :FL-Bond自酸蚀黏结剂脱敏 ;B组 :Super-Bond全酸蚀黏结剂脱敏 ;C组 :Gluma脱敏剂脱敏。结果 :即刻疗效 3组之间无差异 ( P>0 .0 5 )。 1个月和 3个月疗效 :A组、B组两组有效率高于 C组 ( P<0 .0 1 )。结论 :处理后 3个月 ,FL-Bond自酸蚀黏结剂及 Super-Bond全酸蚀黏结剂治疗暴露根面的过敏疗效稳定持久。