Biofilms at the tooth-restoration bonded interface can produce acids and cause recurrent caries. Recurrent caries is a primary reason for restoration failures. The objectives of this study were to synthesize a novel b...Biofilms at the tooth-restoration bonded interface can produce acids and cause recurrent caries. Recurrent caries is a primary reason for restoration failures. The objectives of this study were to synthesize a novel bioactive dental bonding agent containing dimethylaminohexadecyl methacrylate(DMAHDM) and 2-methacryloyloxyethyl phosphorylcholine(MPC) to inhibit biofilm formation at the tooth-restoration margin and to investigate the effects of water-aging for 6 months on the dentin bond strength and protein-repellent and antibacterial durability. A protein-repellent agent(MPC) and antibacterial agent(DMAHDM) were added to a Scotchbond multi-purpose(SBMP) primer and adhesive. Specimens were stored in water at 37 °C for 1, 30, 90, or 180 days(d).At the end of each time period, the dentin bond strength and protein-repellent and antibacterial properties were evaluated. Protein attachment onto resin specimens was measured by the micro-bicinchoninic acid approach. A dental plaque microcosm biofilm model was used to test the biofilm response. The SBMP + MPC + DMAHDM group showed no decline in dentin bond strength after water-aging for 6 months, which was significantly higher than that of the control(P < 0.05). The SBMP + MPC + DMAHDM group had protein adhesion that was only 1/20 of that of the SBMP control(P < 0.05). Incorporation of MPC and DMAHDM into SBMP provided a synergistic effect on biofilm reduction. The antibacterial effect and resistance to protein adsorption exhibited no decrease from 1 to 180 d(P > 0.1). In conclusion, a bonding agent with MPC and DMAHDM achieved a durable dentin bond strength and long-term resistance to proteins and oral bacteria. The novel dental bonding agent is promising for applications in preventive and restorative dentistry to reduce biofilm formation at the tooth-restoration margin.展开更多
The aim of this study was to evaluate the bond strength of orthodontic brackets bonded to tooth enamel with different polymer composites after simulated clinical aging, and analyze the enamel/ bond system fracture int...The aim of this study was to evaluate the bond strength of orthodontic brackets bonded to tooth enamel with different polymer composites after simulated clinical aging, and analyze the enamel/ bond system fracture interface. 80 human premolars, were randomly divided into five groups (n = 16). G1: CO (Concise Ortodontica—3M ESPE), G2: SB (SuperBond—Ortho Source), G3: FMO (Fill Magic Ortodontico—Vigodent), G4: TXT (Transbond XT—3M ESPE) and G5: TP (Transbond Plus Self Etching Primer + Transbond Plus Color Change—3M ESPE). In all groups, the metal orthodontic bracket was bonded to the tooth enamel surface. The specimens were submitted to 3000 thermal cycling baths for 30 s, at temperatures of 5°C, 37°C and 55°C (±1°C). Afterwards they were subjected to shear testing and the results were analyzed by the Student’s-t test (p < 0.05). G1 presented the highest bond strength value, followed by G4 > G5 > G2 > G3. In all groups the majority of the fractures at the interface of the specimens were cohesive, except in G3, which presented the largest number of adhesive fractures. After clinical aging, the chemically activated material (CO) showed higher bond strength than the light activated types (FMO, TXT and TP). The self-etching adhesive system (TP) showed similar bond strength to that of conventional systems (FMO and TXT).展开更多
目的:了解不同复合树脂间粘接后的强度。方法:选用甲基丙烯酸基复合树脂Clearfil APX(APX)及其配套粘接剂Clearfil SE Bond(SE)和环氧基复合树脂Filtek P90(P90)及其配套粘接剂Filtek P90 System Adhesive(SA)。实验分为3组:(1)整块组,...目的:了解不同复合树脂间粘接后的强度。方法:选用甲基丙烯酸基复合树脂Clearfil APX(APX)及其配套粘接剂Clearfil SE Bond(SE)和环氧基复合树脂Filtek P90(P90)及其配套粘接剂Filtek P90 System Adhesive(SA)。实验分为3组:(1)整块组,将树脂分层固化制成完整一体的树脂块;(2)直接充填组,将树脂固化成块后,表面打磨,再直接填充新树脂,光固化;(3)粘接组,树脂固化成块后打磨,涂布粘接剂,再填充新树脂,光固化。将上述树脂试样切成数条1 mm×1 mm×14 mm的样品,检测微拉伸强度,以One-Way ANOVA和LSD法对数据进行统计分析。结果:(1)整块组的微拉伸强度最高,APX为(81.11±1.79)MPa,P90为(82.07±1.42)MPa,差异无统计学意义(P>0.05)。(2)直接充填组中,APX-APX为(43.54±2.99)MPa,P90-APX为(42.74±2.49)MPa,APX-P90为(41.28±1.96)MPa,P90-P90为(42.39±3.24)MPa,各亚组间差异均无统计学意义(P>0.05)。(3)粘接组中,比较上层树脂的种类显示,用APX修复的微拉伸强度均显著高于用P90修复;比较底层树脂的种类显示,当上层树脂粘接相同种类的底层树脂时,其微拉伸强度要高于其对异种树脂的粘接(P<0.05);比较粘接剂的种类系显示,用SE粘接两树脂的微拉伸强度均显著高于用SA粘接。(4)微拉伸强度排序为:整块>SE粘接APX>SA粘接APX>SE粘接P90=直接充填>SA粘接P90。结论:底层树脂表面经打磨后,使用APX粘接修复的强度高于使用P90修复,SE粘接两树脂的强度高于SA,底层树脂的类型对粘接强度影响不大。展开更多
目的:比较两步法酸蚀冲洗型粘接剂与一步法自酸蚀粘接剂用于楔状缺损直接修复的临床效果。方法:选择口内同时存在两颗楔状缺损患牙的患者50人,随机采用两步法酸蚀冲洗型粘接剂(α组)或一步法自酸蚀粘接剂(β组)粘接并用复合树脂修复缺...目的:比较两步法酸蚀冲洗型粘接剂与一步法自酸蚀粘接剂用于楔状缺损直接修复的临床效果。方法:选择口内同时存在两颗楔状缺损患牙的患者50人,随机采用两步法酸蚀冲洗型粘接剂(α组)或一步法自酸蚀粘接剂(β组)粘接并用复合树脂修复缺损。所有操作由一位医师按照标准临床步骤完成,再由另外一位检查者根据改良USPHS(United States Public Health Service)评价标准在术后1周(基线)、6个月及18个月对修复体固位、边缘适合性、边缘着色、继发龋、术后敏感进行评价,采用卡方检验对复查结果进行统计分析。结果:基线两组各纳入50例修复体;6个月复查48位患者,α组与β组分别有两例修复体脱落,18个月复查44位患者,α组与β组分别累计有4例和6例修复体脱落,固位率分别为α组90.0%,β组86.4%。α和β组分别有3例和5例修复体边缘适合性评价为B,两组分别有2例和3例修复体边缘着色评价为B,所有复查修复体均未观察到继发龋及术后敏感的情况。卡方检验显示,两组之间所有评价项目差异均无统计学意义(P>0.05)。结论:一步法自酸蚀粘接剂与两步法酸蚀冲洗型粘接剂在观察时间内表现相近,能够满足临床要求,远期效果仍需进一步观察。展开更多
背景:近年来,纤维桩和树脂核已经被广泛应用于修复已行根管治疗后的大面积牙体硬组织缺损,并取得了令人满意的效果。铒:钇铝石榴石激光(erbium:yttrium aluminum garnet laser,Er:YAG激光)是新型水动力激光系统,可以用于纤维桩的表面处...背景:近年来,纤维桩和树脂核已经被广泛应用于修复已行根管治疗后的大面积牙体硬组织缺损,并取得了令人满意的效果。铒:钇铝石榴石激光(erbium:yttrium aluminum garnet laser,Er:YAG激光)是新型水动力激光系统,可以用于纤维桩的表面处理。但是关于Er:YAG激光表面处理对纤维桩黏结强度影响的实验研究国内外鲜有报道。目的:探讨不同参数Er:YAG激光进行表面处理对玻璃纤维桩与不同部位根管牙本质黏结强度的影响。方法:选择50颗新鲜拔除根长相近的单根管上颌中切牙,常规根管治疗后去除牙冠,完成根桩牙体预备后,黏固Para Post FIBER LUX玻璃纤维桩至根管内。根据黏固前桩表面处理方法,将50颗离体牙随机等分为5组:对照组、1.5,2.5,3.5和4.5 W ER:YAG激光照射组。对照组未进行表面处理,1.5,2.5,3.5和4.5 W ER:YAG激光照射组纤维桩分别以150,250,350和450 m J,频率为10 Hz,脉冲持续频率为100μs的Er:YAG激光进行表面处理60 s。结果与结论:纤维桩与牙本质间黏结强度均值牙颈部最大,根中部次之,根尖部最小。牙颈部黏结强度与根中部和根尖部之间差异有显著性意义(P<0.05);根中部与根尖部之间差异无显著性意义(P>0.05)。相同根管部位的黏结强度值均表现为4.5 W ER:YAG激光照射组最高,且与其他组比差异有显著性意义(P<0.05)。说明用4.5 W Er:YAG桩表面处理可提高纤维桩与根管牙本质的黏结强度,且根颈部黏结强度大于根中及根尖部。展开更多
背景:与传统复合树脂材料相比,大块充填复合树脂材料具有增加光固化深度、降低聚合收缩率、简化临床操作程序等特点,但不同类型大块充填复合树脂材料的性能各异。目的:分析4种复合树脂材料的硬度及黏结强度。方法:取大块填充复合树脂Tet...背景:与传统复合树脂材料相比,大块充填复合树脂材料具有增加光固化深度、降低聚合收缩率、简化临床操作程序等特点,但不同类型大块充填复合树脂材料的性能各异。目的:分析4种复合树脂材料的硬度及黏结强度。方法:取大块填充复合树脂Tetric Evo Ceram Bulk Fill、SDR,以及传统复合树脂P60、Z350,检测4种复合树脂材料分别在2,3,4,5 mm光固化深度下的维氏显微硬度,以及4种复合树脂材料与牙本质间的剪切黏结强度。结果与结论:不同光固化深度下的硬度顺序为:P60复合树脂>Z350复合树脂>Tetric Evo Ceram Bulk Fill复合树脂>SDR复合树脂,4组间比较差异有显著性意义(P<0.05);Tetric Evo Ceram Bulk Filll和SDR复合树脂光固化后的硬度未随着固化深度的增加而明显减小。Tetric Evo Cream Bulk Fil和SDR复合树脂的剪切黏结强度显著高于P60和Z350复合树脂(P<0.05)。表明大块充填树脂材料Tetric Evo Ceram Bulk Fill和SDR的综合机械性能较高,并且具有较高的剪切黏结强度。展开更多
基金the Natural Science Foundation of China NSFC 81500879(N.Z.),81400540(K.Z.)the Beijing Municipal Science and Technology Commission Z151100003915137(N.Z.)+2 种基金the Beijing Municipal Administration of Hospitals’YouthProgram QML20161501(N.Z.),QML20151401(K.Z.)the Beijing Municipal Hospitals’Program ZYLX201703(Y.B.),NIH R01 DE17974(H.X.)a Seed Grant(H.X.)from the University of Maryland School of Dentistry
文摘Biofilms at the tooth-restoration bonded interface can produce acids and cause recurrent caries. Recurrent caries is a primary reason for restoration failures. The objectives of this study were to synthesize a novel bioactive dental bonding agent containing dimethylaminohexadecyl methacrylate(DMAHDM) and 2-methacryloyloxyethyl phosphorylcholine(MPC) to inhibit biofilm formation at the tooth-restoration margin and to investigate the effects of water-aging for 6 months on the dentin bond strength and protein-repellent and antibacterial durability. A protein-repellent agent(MPC) and antibacterial agent(DMAHDM) were added to a Scotchbond multi-purpose(SBMP) primer and adhesive. Specimens were stored in water at 37 °C for 1, 30, 90, or 180 days(d).At the end of each time period, the dentin bond strength and protein-repellent and antibacterial properties were evaluated. Protein attachment onto resin specimens was measured by the micro-bicinchoninic acid approach. A dental plaque microcosm biofilm model was used to test the biofilm response. The SBMP + MPC + DMAHDM group showed no decline in dentin bond strength after water-aging for 6 months, which was significantly higher than that of the control(P < 0.05). The SBMP + MPC + DMAHDM group had protein adhesion that was only 1/20 of that of the SBMP control(P < 0.05). Incorporation of MPC and DMAHDM into SBMP provided a synergistic effect on biofilm reduction. The antibacterial effect and resistance to protein adsorption exhibited no decrease from 1 to 180 d(P > 0.1). In conclusion, a bonding agent with MPC and DMAHDM achieved a durable dentin bond strength and long-term resistance to proteins and oral bacteria. The novel dental bonding agent is promising for applications in preventive and restorative dentistry to reduce biofilm formation at the tooth-restoration margin.
文摘The aim of this study was to evaluate the bond strength of orthodontic brackets bonded to tooth enamel with different polymer composites after simulated clinical aging, and analyze the enamel/ bond system fracture interface. 80 human premolars, were randomly divided into five groups (n = 16). G1: CO (Concise Ortodontica—3M ESPE), G2: SB (SuperBond—Ortho Source), G3: FMO (Fill Magic Ortodontico—Vigodent), G4: TXT (Transbond XT—3M ESPE) and G5: TP (Transbond Plus Self Etching Primer + Transbond Plus Color Change—3M ESPE). In all groups, the metal orthodontic bracket was bonded to the tooth enamel surface. The specimens were submitted to 3000 thermal cycling baths for 30 s, at temperatures of 5°C, 37°C and 55°C (±1°C). Afterwards they were subjected to shear testing and the results were analyzed by the Student’s-t test (p < 0.05). G1 presented the highest bond strength value, followed by G4 > G5 > G2 > G3. In all groups the majority of the fractures at the interface of the specimens were cohesive, except in G3, which presented the largest number of adhesive fractures. After clinical aging, the chemically activated material (CO) showed higher bond strength than the light activated types (FMO, TXT and TP). The self-etching adhesive system (TP) showed similar bond strength to that of conventional systems (FMO and TXT).
文摘目的:比较两步法酸蚀冲洗型粘接剂与一步法自酸蚀粘接剂用于楔状缺损直接修复的临床效果。方法:选择口内同时存在两颗楔状缺损患牙的患者50人,随机采用两步法酸蚀冲洗型粘接剂(α组)或一步法自酸蚀粘接剂(β组)粘接并用复合树脂修复缺损。所有操作由一位医师按照标准临床步骤完成,再由另外一位检查者根据改良USPHS(United States Public Health Service)评价标准在术后1周(基线)、6个月及18个月对修复体固位、边缘适合性、边缘着色、继发龋、术后敏感进行评价,采用卡方检验对复查结果进行统计分析。结果:基线两组各纳入50例修复体;6个月复查48位患者,α组与β组分别有两例修复体脱落,18个月复查44位患者,α组与β组分别累计有4例和6例修复体脱落,固位率分别为α组90.0%,β组86.4%。α和β组分别有3例和5例修复体边缘适合性评价为B,两组分别有2例和3例修复体边缘着色评价为B,所有复查修复体均未观察到继发龋及术后敏感的情况。卡方检验显示,两组之间所有评价项目差异均无统计学意义(P>0.05)。结论:一步法自酸蚀粘接剂与两步法酸蚀冲洗型粘接剂在观察时间内表现相近,能够满足临床要求,远期效果仍需进一步观察。
文摘背景:近年来,纤维桩和树脂核已经被广泛应用于修复已行根管治疗后的大面积牙体硬组织缺损,并取得了令人满意的效果。铒:钇铝石榴石激光(erbium:yttrium aluminum garnet laser,Er:YAG激光)是新型水动力激光系统,可以用于纤维桩的表面处理。但是关于Er:YAG激光表面处理对纤维桩黏结强度影响的实验研究国内外鲜有报道。目的:探讨不同参数Er:YAG激光进行表面处理对玻璃纤维桩与不同部位根管牙本质黏结强度的影响。方法:选择50颗新鲜拔除根长相近的单根管上颌中切牙,常规根管治疗后去除牙冠,完成根桩牙体预备后,黏固Para Post FIBER LUX玻璃纤维桩至根管内。根据黏固前桩表面处理方法,将50颗离体牙随机等分为5组:对照组、1.5,2.5,3.5和4.5 W ER:YAG激光照射组。对照组未进行表面处理,1.5,2.5,3.5和4.5 W ER:YAG激光照射组纤维桩分别以150,250,350和450 m J,频率为10 Hz,脉冲持续频率为100μs的Er:YAG激光进行表面处理60 s。结果与结论:纤维桩与牙本质间黏结强度均值牙颈部最大,根中部次之,根尖部最小。牙颈部黏结强度与根中部和根尖部之间差异有显著性意义(P<0.05);根中部与根尖部之间差异无显著性意义(P>0.05)。相同根管部位的黏结强度值均表现为4.5 W ER:YAG激光照射组最高,且与其他组比差异有显著性意义(P<0.05)。说明用4.5 W Er:YAG桩表面处理可提高纤维桩与根管牙本质的黏结强度,且根颈部黏结强度大于根中及根尖部。
文摘背景:与传统复合树脂材料相比,大块充填复合树脂材料具有增加光固化深度、降低聚合收缩率、简化临床操作程序等特点,但不同类型大块充填复合树脂材料的性能各异。目的:分析4种复合树脂材料的硬度及黏结强度。方法:取大块填充复合树脂Tetric Evo Ceram Bulk Fill、SDR,以及传统复合树脂P60、Z350,检测4种复合树脂材料分别在2,3,4,5 mm光固化深度下的维氏显微硬度,以及4种复合树脂材料与牙本质间的剪切黏结强度。结果与结论:不同光固化深度下的硬度顺序为:P60复合树脂>Z350复合树脂>Tetric Evo Ceram Bulk Fill复合树脂>SDR复合树脂,4组间比较差异有显著性意义(P<0.05);Tetric Evo Ceram Bulk Filll和SDR复合树脂光固化后的硬度未随着固化深度的增加而明显减小。Tetric Evo Cream Bulk Fil和SDR复合树脂的剪切黏结强度显著高于P60和Z350复合树脂(P<0.05)。表明大块充填树脂材料Tetric Evo Ceram Bulk Fill和SDR的综合机械性能较高,并且具有较高的剪切黏结强度。
