复合树脂嵌体修复后牙体抗力的三维有限元研究

目的:对直接树脂和间接树脂嵌体修复后牙体的抗力进行三维有限元研究。方法:通过2种加载方式(中央窝垂直加载和2功能面上与牙长轴呈45°加载),研究4种材料(Tescera间接树脂、Renew通用树脂、陶瓷和Co-Cr合金)嵌体修复后牙体应力分布的变化。对照组:备洞未充填的缺损牙体和完整牙体。结果:4种材料嵌体均可以提高缺损牙的抗力,改善缺损牙体内部的应力分布。2种树脂嵌体修复后的牙体应力分布与完整牙体相似;陶瓷、Co-Cr合金则改变了牙本质原有的应力分布。结论:复合树脂嵌体修复能提高缺损牙体的抗力;复合树脂不同固化处理对牙体抗力无明显影响。     

树脂直接充填与超瓷嵌体修复牙体缺损的微渗漏比较

目的 探讨用Filtek Z350复合树脂和超瓷嵌体修复Ⅰ类、Ⅱ类洞的边缘微渗漏的差异.方法 选取40颗新鲜拔除的第三磨牙,随机分成4组,每组10颗.A1组为Ⅰ类洞树脂直接充填,A2组为Ⅱ类洞树脂直接充填,B1组为Ⅰ类洞型超瓷嵌体修复,B2组为Ⅱ类洞超瓷嵌体修复.4组均置于1％碱性品红溶液染色21 d.用低速金刚砂锯沿牙体长轴近远中向切开,制备牙齿切片,体视显微镜观测粘接界面染色剂渗透深度.结果 （1）Ⅰ类（Z=5.909）、Ⅱ类洞（轴壁Z=5.504,龈壁Z=2.958）超瓷嵌体的边缘微渗漏都显著小于Z350复合树脂直接充填（P＜0.05）;（2）无论树脂直接充填（Z=1.413）还是嵌体修复（Z=0.455）,Ⅰ类、Ⅱ类洞的微渗漏差异无统计学意义（P＞0.05）.结论 超瓷嵌体修复是牙体缺损理想的修复方法.     

3种窝洞修复方法之间微渗漏的比较

目的:探讨用复合树脂修复Ⅴ类洞时,3种不同修复方法之间微渗漏的差异。方法:挑选36颗3个月内拔除的完整磨牙,制备颊面Ⅴ类洞,将牙随机平均分为3组(n=12),分别使用直接充填法、预热充填法和间接嵌体法完成3M Z350复合树脂修复体,经过500次冷热水循环试验后用品红染色。将牙体纵切成厚度为0.9 mm的薄片,用体视显微镜观测染料渗透深度。结果:预热树脂组和嵌体组之间微渗漏差别无显著性,均显著小于直接充填组(P≤0.05)。结论:使用预热树脂充填和嵌体修复均可减小Ⅴ类洞龈壁边缘微渗漏。     

提高塑料牙与基托树脂结合强度的实验研究

测定了３种塑料牙盖嵴面经４种预处理方法处理后塑料牙与基托树脂的剪切粘接强度，结果表明，涂氯仿组的粘接强度明显大于对照组，而且，氯仿的效果更优于单体。     

3种树脂材料修复离体牙Ⅱ类洞的边缘裂隙和 微渗漏比较

目的 研究3种树脂材料修复离体牙Ⅱ类洞的边缘裂隙及微渗漏情况。方法 选取符合纳入标准的60颗离体磨牙,随机分为大块充填树脂组、传统树脂组和树脂嵌体组3组,每组20颗。制备Ⅱ类洞,并按照其充填或制作标准进行修复。扫描电镜下测量边缘裂隙宽度,经1%亚甲蓝染色,去除面2.0 mm釉质,抛光后在体式显微镜下观察边缘染色深度。结果 树脂嵌体组的边缘裂隙最小,大块充填树脂组次之,传统树脂组最大,差异具有统计学意义(P<0.05);树脂嵌体组的染色深度明显小于大块充填树脂组和传统树脂组,差异具有统计学意义(P<0.05);大块充填树脂组与传统树脂组间染色深度差异无统计学意义(P>0.05)。结论 从修复体的边缘裂隙和微渗漏两个方面来看,树脂嵌体效果良好,值得临床推广应用。     

SonicFill声波树脂直接和间接法修复后牙Ⅱ类洞的微渗漏表现

目的:探讨SonicFill声波树脂通过直接充填技术或树脂嵌体技术修复人离体后牙的Ⅱ类洞,比较两种修复方法边缘微渗漏的差异.方法:收集50颗人离体前磨牙制备标准的Ⅱ类洞型腔,随机分成两组,每组25颗.A组使用SonicFill声波树脂直接充填修复,B组使用SonicFill声波树脂制作树脂嵌体进行修复.通过温度循环后每...     

3种树脂基托试件微生物黏附的研究

目的比较BPS注塑树脂、热凝基托树脂和不碎胶树脂表面的微生物黏附能力。方法将BPS注塑树脂、热凝基托树脂和不碎胶树脂试件进行微生物体外黏附实验,采用菌落形成单位计数法测定血链球菌、黏性放线菌和白色假丝酵母菌黏附量的大小。结果血链球菌和白色假丝酵母菌黏附实验中,培养24、48、168h后,热凝基托树脂组与BPS注塑树脂组和不碎胶树脂组间微生物黏附量差异有统计学意义（P〈0.001）,BPS注塑树脂组和不碎胶树脂组间微生物黏附量差异无统计学意义（P〉0.05）。在黏性放线菌黏附实验中,培养24h时,热凝基托树脂组和BPS注塑树脂组间微生物黏附量差异有统计学意义（P〈0.05） 培养48、168h时,热凝基托树脂组与不碎胶树脂组和BPS注塑树脂组间微生物黏附量差异有统计学意义（P〈0.05）。结论BPS注塑树脂和不碎胶树脂较热凝基托树脂更能减少血链球菌、黏性放线菌和白色假丝酵母菌在其表面的黏附。     

Poss复合树脂嵌体与牙体间微渗漏的研究

目的：比较Poss复合树脂嵌体与其余3种临床常用复合树脂嵌体与牙体间的微渗漏情况,为临床选择提供依据。方法：将40颗离体牙随机分成4组,每组10颗,按照国际标准,备Ⅱ类洞,分别用Poss,Z250,Solidex,Sol-itaire2树脂制作嵌体,恒温保存,品红染色后,近远中方向剖开牙体,体视显微镜下观察每组嵌体龈壁和轴壁的微渗漏最显著部位,并测量3次取平均值。结果：Poss复合树脂嵌体与牙体间微渗漏最小,其余3种无统计学差异。结论：Poss复合树脂可以考虑作为临床嵌体材料。     

Microtensile bond strength of resin composite bonded to caries-affected dentin with three adhesives

This study evaluated the ability of two self-etching adhesives (a two-step and a one-step) and a conventional 3-step adhesive to bond composite to both intact and caries-affected dentin with and without thermocycling. Thirty extracted human teeth with occlusal caries were randomly assigned to three groups according to the adhesive used: Scotchbond Multi-purpose (3M) (SBMP), ClearfilSE Bond (Kuraray) (SE) and Xeno IV (Dentsply) (XEIV). The occlusal surfaces of the teeth were sectioned to expose dentin. The adhesives were applied according to manufacturers' instructions, and a composite material (Herculite XRV, Kerr) was applied and cured in increments to form a core 3 mm high. The teeth were stored in distilled water for 24 hours, then sectioned using a micro-slicing machine to obtain sections 1 mm thick. The sections were further cut to obtain rods 6 mm long and 1 x 1 mm in thickness, with dentin/composite interface located at the center. The specimens were examined microscopically to separate the caries-affected (AD) and sound dentin (SD) into two groups. Half the specimens from each group were subjected to 3,000 thermocycles (5 degrees C to 55 degrees C) prior to testing. All the specimens were then subjected to microtensile bond strength (microTBS) testing in a special apparatus. Mean microTBS was determined for each group, and data were statistically analyzed with ANOVA and Tukey's tests. Mean microTBS and standard deviation values in MPa were: SBMP-SD = 22.19 (4.6), SBMP-SD-thermocycled = 15.7 (5.55), SBMP-AD = 18.6 (2.89), SBMP-AD-thermocycled = 16.62 (6.23), SE-SD = 24.25 (5.7), SE-SD-thermocycled = 22.3 (6.7), SE-AD = 20.7 (5.55), SE-AD-thermocycled = 20.23 (6.1), XEIV-SD = 21.43 (7.6), XEIV-SD-thermocycled = 18.3 (7.11), XEIV-AD = 15.45 (6.62), XEIV-AD-thermocycled = 14.8 (3.89). ANOVA revealed a significant difference among the groups (p < .0001). The two-step self-etch adhesive resulted in highest mean microTBS values under all test conditions. However, these mean values were significantly higher than the mean values obtained with the other two adhesives under some, but not all test conditions.     

Microtensile bond strength of a nanofilled composite resin to human dentin after nonvital tooth bleaching

PURPOSE: The purpose of this in vitro study was to measure the microtensile bond strength of a nanofilled composite resin to human dentin after nonvital bleaching at different post-bleaching time intervals, and to analyze the fracture mode under SEM. MATERIALS AND METHODS: Thirty-six sound human maxillary premolars extracted for orthodontic reasons were prepared in a standardized manner, and randomly assigned to four groups (n = 9): non bleached (control) (NB); bleached with sodium perborate and 35% hydrogen peroxide (SP-HP); bleached with 35% hydrogen peroxide (HP); and bleached with 37% carbamide peroxide (CP). Each group was subdivided into 3 subgroups (n = 3): restored immediately (RO); restored after 7 days (R7); and restored after 14 days (R14). The teeth were stored in distilled water for 24 h, sectioned 4 mm below cementoenamel junction, and the crown was serially sectioned to obtain sticks (0.9 mm2 cross section) for microtensile bond strength testing. The microTBS samples were attached to a universal testing machine (Instron, model 4444), using a Geraldeli's device. The test was performed until the fracture of the specimens, and all specimens were analyzed under a scanning electron microscope (Philips XL-30). RESULTS: Two-way ANOVA (p = 0.05) revealed that there were no statistically significant differences of bond strength values for the bleaching agents used, or at different post-bleaching time intervals. CONCLUSION: It was concluded that the definitive restoration can be accomplished immediately after nonvital bleaching treatment.     

三种树脂粘接剂对可切削复合树脂与牙本质粘接强度的比较研究

目的 通过比较3种树脂粘接剂对聚甲基丙烯酸甲酯-纳米二氧化硅-二氧化锆(polymethylmecrylate/nano SiO2-ZrO2,PNSZ)可切削复合树脂与牙本质的粘接强度的差异,寻找适合PNSZ可切削复合树脂的树脂粘接剂,为临床应用提供参考.方法 使用树脂粘接剂A(RelyX ARC)、B(Panavia-F)和c(Variolink II)粘接PNSZ可切削复合树脂与牙本质,测试剪切粘接强度和微拉伸粘接强度(各分为A、B、C 3组,每组10个试件),并采用50倍立体显微镜观察断裂模式.结果 剪切测试中A、B、C组试件的粘接强度分别为(14.07±4.67)、(13.17±4.63)、(12.10±2.18)MPa,差异无统计学意义(P＞0.05);微拉伸测试中A、B、C组试件的粘接强度分别为(11.49±4.90)、(9.66±4.15)、(10.11±4.20)MPa,差异无统计学意义(P＞0.05).立体显微镜观察显示,3种粘接剂的断裂模式均以牙本质-粘接剂界面的断裂为主.结论 3种树脂粘接剂对PNSZ可切削复合树脂与牙本质的粘接效果相近.PNSZ可切削复合树脂一粘接剂界面的粘接优于牙本质-粘接剂界面.     

复合树脂嵌体的研究进展及应用现状

复合树脂嵌体也称间接性树脂修复,是由含有双甲基丙烯酸酯基类的复合树脂在体外固化制作而成。体外固化过程释放了复合树脂嵌体的聚合收缩应力,使修复体的聚合收缩局限在粘接层内;同时提高了复合树脂的聚合程度,提升了其机械性能。同样,由于复合树脂嵌体有体外操作过程,因此在解剖形态方面更佳,有着相比直接树脂充填更良好的邻面接触和面形态。相比瓷嵌体,复合树脂嵌体有着修补方便,不磨耗对牙等特点。随着复合树脂材料及树脂粘接材料的更新,复合树脂嵌体的性能如抗折裂强度、边缘微渗漏、硬度及耐磨性等方面得以提高,复合树脂嵌体在临床方面的应用逐渐广泛,不仅限于牙体严重缺损活髓牙的修复,在完成牙髓治疗后的牙齿、隐裂牙、重度磨损牙等疾患中均有应用。本文就近年来复合树脂嵌体的性能研究及临床应用现状作一综述。     

两种不同固化处理的复合树脂黏接微拉伸强度测试研究

目的　对不同固化处理的复合树脂黏接微拉伸强度进行测试。方法　新鲜拔除的完好无龋、人下颌第三磨牙15颗,随机分成3组,用Isomet低速切割机流水冲洗下磨去咬合面釉质,暴露牙本质,用Renew树脂直接充填、Renew树脂间接修复、Tescera树脂间接修复制作树脂“冠”并黏接在牙本质面上,贮存于室温水中2 4h ,测试微拉伸强度。结果　Renew树脂直接充填组(33.38±6 .2 4 )MPa的微拉伸强度高于Renew间接修复组(2 0 .0 6±4 .96 )MPa和Tescera间接修复组(2 0 .87±4 .6 2 )MPa ,差异有显著性(P <0 .0 5 ) ,后两者之间差异无显著性。结论　树脂直接充填的微拉伸强度要高于树脂间接修复。     

Comparative bond strengths of autopolymerising denture resin and light cured composite resin to denture teeth

AIM: To investigate the shear bond strengths between light cured composite and autopolymerised acrylic resin bonded to acrylic resin denture teeth. METHODS: Surface treatments were used for the denture teeth included wetting with methylmethacrylate (MMA) monomer, composite bonding agent and acid etching. The samples were divided into seven groups. Two groups of specimens were immersed in distilled water for 30 days to hydrate the teeth. Five other groups of embedded denture teeth were stored in air at room temperature for 30 days. RESULTS: Analysis of variance indicated statistically significant differences between groups (P < 0.001). CONCLUSION: The greatest bond strengths to denture teeth were in acrylic resins polymerised with pressure and wetted with monomer. The bond strengths of hydrated and unhydrated samples gave similar results both with acrylic resins and composites.     

Microtensile bond strength of a new silorane-based composite resin adhesive

Filtek LS is a new composite resin restorative system with a unique, low-shrinking, silorane-based monomer matrix. The current study was conducted to compare the durability of the bond to dentin of the new silorane-based bonding agent, Filtek Silorane System Adhesive, to the gold standard methacrylate-based bonding agent, Clearfil SE Bond. Extracted human molar teeth were sectioned to expose dentin. Either Filtek Silorane System Adhesive with Filtek LS composite or Clearfil SE Bond with Clearfil Majesty Posterior composite was applied to the dentin according to the manufacturer's instructions. The composites were placed incrementally and sectioned perpendicular to the composite-tooth interface to obtain rectangular beams. The beams were stored for 24 hours, 6 months, or 12 months in distilled water and stressed in tension in a universal testing machine. Data were analyzed with a two-way ANOVA/Tukey test. The 24-hour microtensile bond strengths were significantly greater than the 6- and 12-month bond strengths. Overall, there was no significant difference in the microtensile bond strength to dentin between the Filtek Silorane System Adhesive and the Clearfil SE Bond adhesive bonding agents. After one year of water storage, the new silorane-based composite resin bonding agent performed as well as the methacrylate-based composite resin bonding agent.     

复合树脂直接与间接修复的粘接微拉伸强度测试研究

目的对复合树脂直接与间接修复的粘接微拉伸强度进行测试。方法新鲜拔除的完好无龋、人下颌第三磨牙15颗,随机分成3组,用Isomet低速切割机流水冲洗下磨去咬合面釉质,暴露牙本质,A组为Renew树脂用One Step Plus直接粘接在牙本质面上,B组为预成的Renew树脂＂冠＂用One Step Plus和C＆B cement间接粘接修复,C组为预成的Renew树脂＂冠＂用One Step Plus和Duo-link间接粘接修复,贮存于室温水中24h,测试微拉伸强度,检查断裂界面。结果A组微拉伸强度（33.38±6.24）MPa高于B组（20.06±4.96）MPa和C组（21.08±4.60）MPa,且差异有显著性,BC两组的微拉伸强度无统计差异。结论树脂直接充填粘接的微拉伸强度要高于树脂间接修复。     

不同水门汀黏接树脂嵌体对牙体抗折力影响的研究

目的评价不同的水门汀黏接树脂嵌体后,牙体抗折力的差异。方法选20颗健康的上颌前磨牙,在面制备近远中邻洞(MOD洞)并作树脂嵌体,分为4组:A组(玻璃离子水门汀,GIC);B组(聚羧酸锌水门汀);C组(树脂加强型玻璃离子水门汀,RRGIC);D组(树脂水门汀,ARC)黏接树脂嵌体。样品经37℃水浴72h;5-55℃水浴循环2500次后,用振动动态测试系统进行抗折实验。结果RPGIC组与ARC组的抗折力高于GIC组和聚羧酸锌水门汀组;RPGIC组与ARC组之间无显著差异;GIC组和聚羧酸锌水门汀组之间无显著差异。结论RPGIC可以成为替代ARC的一种理想选择。