喷砂处理对不同底面设计陶瓷托槽再粘接影响的实验研究

目的：探讨喷砂处理对不同底面设计的陶瓷托槽再粘接抗剪切强度的影响。方法：选取90颗因正畸拔除的健康前磨牙,随机抽取30颗用于制备脱落陶瓷托槽,其余60颗用于粘接实验。将60颗牙根据不同底面设计分成3大组：微隐窝底面组（A组）、微晶体底面组（B组）、树脂底面组（C组）,每大组分成2小组：新托槽组（n）、喷砂组（sb）,每组10颗牙。陶瓷托槽粘接于未经酸蚀处理的微湿的离体牙上,然后用去托槽钳小心取下,形成脱落托槽,对托槽底面进行喷砂处理,并在底面常规涂硅烷偶联剂。离体牙经常规牙面处理后,分别粘接新托槽及处理后的托槽,测定并比较各组抗剪切强度。结果：三组托槽初次粘接及再次粘接抗剪切强度分别为（12．4733±3．4326）Mpa和（9．1612±1．3261） Mpa;（12．7374±3．8999）Mpa和（6．7152±3．1876）Mpa;（9．5022±1．8801）Mpa和（6．6281±2．1187）Mpa,其中A组的抗剪切强度大于B组和C组的抗剪切强度,差别有统计学意义（P＜0．05）;B组和C组两者的抗剪切强度有差别,但无统计学意义（P＞0．05）。结论：三组陶瓷托槽再粘接抗剪切强度明显下降,但高于正畸临床所需的最低抗剪切强度值。其中微隐窝底面与微晶底面和聚合体网底相比,抗剪切强度下降最少,更适合喷砂处理。     

不同处理方法对硅藻土基全瓷材料瓷瓷结合强度的影响

目的 研究不同表面处理方法对新型硅藻土基底材料与IPS e.max饰面瓷结合强度的影响.方法 将硅藻土基底瓷打磨,超声清洗,随机分为3组进行不同处理,酸蚀、喷砂、不处理.每组样品经处理后,分别烧结饰面瓷ISP e.max.测不同处理方法下硅藻土基底瓷与不同ISP e.max饰面之间的剪切强度,并进行统计分析.通过扫描电子显微镜-能量散射光谱仪（SEM-EDS）观察表面处理界面显微结构及元素分布.结果 酸蚀处理组的结合强度为（23.02±1.28） MPa,显著高于未处理组,差异有统计学意义（P＜0.0l）,结合界面紧密结合;喷砂组的结合强度与未处理组差异无统计学意义（P＞0.05）.结论 酸蚀处理可显著增强硅藻土基底材料与ISP e.max饰面瓷结合强度.     

Evaluation of surface roughness and bond strength of quartz fiber posts after various pre-treatments

Purpose. Debonding at the post-adhesive interface is a major problem for quartz fiber posts. The objective of this study was to evaluate surface roughness and bond strength of quartz fiber posts after various surface treatments. Materials and methods. Sixty-six quartz fiber posts were randomly divided into six experimental groups (n = 11) including group C, untreated (control); group SB, sandblasted; group SC, silica coated; group HF, hydrofluoric acid-etched; group N, Nd:YAG laser irradiated; group E, Er:YAG laser irradiated. Surface roughness of the posts was measured before and after pre-treatment. They were then bonded to resin cement and tensile bond strength was determined in a universal testing machine. Furthermore, two-way ANOVA and post hoc comparison tests (α = 0.05) were performed on all data. Results. The highest mean force value was observed in group SB and followed by group E. Tukey’s HSD test showed that there was no statistical difference between group SB and group E (p = 0.673). The highest mean roughness value was observed in group SB and a significant difference was found between group SB and all other groups (p < 0.001). This study reveals that sandblasting and Er:YAG laser irradiation provided a significant increase in bond strength between quartz fiber posts and resin cement. Conclusions. Sandblasting or Er:YAG laser-irradiation of the surface of the quartz fiber post before cementation is recommended for increasing retention.     

Effect of temporary cements on the microtensile bond strength of self-etching and self-adhesive resin cement

Objective. The aim of this study was to evaluate the microtensile bond strength (µTBS) of self-etching and self-adhesive resin cement systems to dentin affected by the presence of remnants of either eugenol-containing or eugenol-free temporary cements. Materials and methods. Thirty extracted teeth were obtained and a flat dentin surface was exposed on each tooth. Acrylic blocks were fabricated and cemented either with one of two temporary cements, one zinc oxide eugenol (ZOE) and one eugenol free (ZOE-free), or without cement (control). After cementation, specimens were stored in water at 37°C for 1 week. The restorations and remnants of temporary cements were removed and dentin surfaces were cleaned with pumice. Resin composite blocks were cemented to the bonded dentin surfaces with one of two resin cements, either self-etching (Panavia F 2.0) or self-adhesive (RelyX U-100). After 24 h, the specimens were sectioned to obtain beams for submission to µTBS. The fracture mode was evaluated under a stereoscopic loupe and a scanning electron microscope (SEM). Data from µTBS were submitted to two-way repeated-measure ANOVA and the Tukey test (alpha = 0.05). Results. The cross-product interaction was statistically significant (p < 0.0003). The presence of temporary cements reduced the bond strength to Panavia self-etching resin cements only (p < 0.05). Fracture occurred predominantly at the dentin–adhesive interface. Conclusions. The presence of eugenol-containing temporary cements did not interfere in the bond strength to dentin of self-adhesive resin cements.     

三种水门汀材料拉伸粘接强度的对比研究

目的：对比研究三种水门汀材料对牙釉质和牙本质的粘接强度。方法：分别制作60个直径16mm,厚4mm的牙釉质及牙本质标准试件,依次用200#、400#、600#水砂纸单面打磨试件,形成标准粘接面。分别将牙釉质及牙本质试件完全随机分为三组,每组20个试件,分别用FujiI、SmartCem2和PermaCem三种水门汀材料按使用说明进行粘接,测试不同材料的拉伸粘接强度,并对数据进行统计分析。结果：牙釉质组的粘接强度：FujiI为5．50±1．84MPa,SmartCem2为17．16±3．40MPa,PermaCem为9．18±1．92MPa。三种材料的粘接强度两两比较差异均存在统计学意义（P〈0．05）,其中,SmartCem2最高,FujiI最低。牙本质组的粘接强度：FujiI为4．73±1．23MPa,SmartCem2为11．24±2．60MPa,PermaCem为8．51±1．35MPa。三种材料的粘接强度两两比较差异均存在统计学意义（P〈0．05）,其中,SmartCem2最高,FujiI最低。结论：SmartCem2的粘接强度在牙釉质组及牙本质组均高于FujiI及PermaGem,提示其粘接性能优于另外两种材料,因而可适用于临床修复体的粘接。此外,PermaCem具有一定的粘接强度及良好的理化性能,也是较适宜的临床粘接材料。     

酸蚀及微弧氧化对钛表面处理后与瓷结合强度的实验研究

目的：研究酸蚀和微弧氧化单独或联合应用对纯钛表面处理后进行烤瓷,观察其表面粗糙度并分析其钛瓷结合强度。方法：将50个纯钛试片（25mm×5mmx0．5mm）随机均分为5组,表面用碳化硅砂纸抛光后110μmA12O3进行喷砂处理,再进行喷砂、酸蚀、微弧氧化、酸蚀后微弧氧化及微弧氧化后酸蚀处理分别为A到E组,用粗糙度测试仪测量各组的粗糙度值并进行统计学分析,扫描电镜观察试件的表面形貌。行瓷粉烧结（厚度控制在1mm）,然后对钛瓷间的三点弯曲结合强度进行测试并进行统计学分析,用扫描电镜观察钛瓷分离面的的表面形貌。结果：酸蚀使纹路更清晰,粗糙度增加。C组纯钛表面形成许多孔洞,孔洞较大,大小基本一致。C组除大孔洞外还存在许多小孔洞,均匀致密。D组表面孔洞大小不一,较致密,存在凹陷,边缘不规则,个别相邻孔洞之间可见微裂纹。与喷砂相比,微弧氧化处理使纯钛与瓷的结合强度差异有统计学意义（P〈0．05）,而酸蚀处理的钛表面与瓷的结合强度增加,但与对照组差异无统计学意义（P〉0．05）。结论：酸蚀和微弧氧化联合处理与单独微弧氧化处理钛瓷间的结合强度差异无统计学意义,说明微弧氧化处理更利于钛瓷间的结合。     

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目的探讨化学机械去龋制剂CarisolvⅢ对牙本质黏结强度的影响。方法收集2014年3—6月在中国医科大学口腔医学院口腔颌面外科门诊因各种原因拔除的龋坏恒磨牙40颗,将每颗牙齿沿龋洞中心纵剖为两部分（即为两组,每组40个样本）。CarisolvⅢ去龋组：采用CarisolvⅢ化学机械法去龋;机械去腐组：采用慢速球钻去龋。将两组再各自随机均分为两组,分别用3M ESPE自酸蚀黏结剂和Adper Single Bond 2全酸蚀黏结剂黏结,然后用3M Z350光固化复合树脂分层充填。制作各样本的微拉伸试件,测试微拉伸黏结强度并进行比较分析。结果CarisolvⅢ去龋组的微拉伸黏结强度：采用3M ESPE自酸蚀黏结系统为（19.50±6.83）MPa,采用Adper Single Bond 2全酸蚀黏结系统为（24.35±7.97）MPa。机械去腐组的微拉伸黏结强度：采用3M ESPE自酸蚀黏结系统为（18.10±7.55）MPa,采用Adper Single Bond 2全酸蚀黏结系统为（23.50±8.33）MPa。采用相同黏结系统的两种去龋方法的微拉伸黏结强度比较,差异无统计学意义（P〉0.05）;而同一种去龋法,采用Adper Single Bond 2全酸蚀黏结系统的微拉伸黏结强度高于3M ESPE自酸蚀黏结系统,差异有统计学意义（P〈0.05）。结论 CarisolvⅢ化学机械去龋法能够获得与机械去腐法同样的牙本质黏结强度。