复合树脂充填材料对罗猴牙髓的组织学影响

本文之研究是比较Smile,Simulate和试验复合树脂#~2在罗猴的乳牙和恒牙中的生物学反应,并用氧化锌丁香油粘固粉和硅粘固粉作对照,以确定这些树脂与以前可能取得的某些复合树脂和硅粘固粉对牙髓是否有更多的相容性。     

光固化复合树脂修补活髓牙缺损几种垫底材料的比较

为了选择良好的垫底材料用于活够前牙缺损的光固化复合树脂的修复，本研究采用高级牙用羧聚陶瓷、丁香油粘固粉、磷酸锌粘固粉、氢氧化钙糊剂作为垫底材料，用于前牙牙本质浅层及牙本质深层损坏的光固化树脂修复。比较以上4种材料在保护牙髓，以及充填体牢固程度和颜色等方面的差异，结果证明高级牙用羧聚陶瓷明显优于其他材料，是目前较为理想的前牙光固化树脂修复的垫底材料。     

固化工艺对晶须熔附颗粒复合树脂性能的影响

目的研究固化工艺对硼酸铝晶须熔附SiO_2颗粒(ABw-SiO_2)复合树脂性能的影响。方法根据胺活化剂(DHET)在复合树脂中的质量百分数,分为0.2%,0.3%和0.4%3个实验组,光固化型作为对照组,分别制作ABw-SiO_2复合体牙科复合树脂试件,检测试件弯曲强度和弯曲弹性模量;傅立叶变换红外光谱仪(FTIR)测试树脂的双键转化率。结果3组双固化ABw-SiO_2颗粒复合树脂弯曲性能差异无显著性。双固化型ABw-SiO_2颗粒复合树脂双键转化率为(62.23±1.43)%,光固化型为(55.96±1.86)%。结论双固化型ABw-SiO_2复合树脂的双键转化率高于光固化型树脂。     

光固化复合树脂修补活髓牙缺损几种垫底材料的比较

为了选择良好的垫底材料用于活髓前牙缺损的光固化复合树脂的修复，本研究采用高级牙用羧聚陶瓷，丁香油粘固粉，磷酸锌粘固粉，氢氧化钙糊剂作为垫底材料，用于前牙牙本质浅层及牙本质深层损坏的光固化树脂修复。比较以上４种材料在保护牙髓，以及充填体牢固程度和颜色等单方面的差异，结果证明高级牙用羧聚陶瓷明显优于其他材料，是目前较为到时候的前牙光固化树脂修复的垫底材料。     

用于正畸托槽粘接的玻璃离子粘固剂的抗剪切强度

目的　研究用于正畸托槽粘接的树脂改良型玻璃离子粘固剂的抗剪切强度。方法　 30颗离体前磨牙平均分为 2组。一组用树脂改良型玻璃离子粘固剂 (Advance)粘接方丝弓正畸托槽 ,另一组用复合树脂釉质粘接剂 (DM)粘接。 2 4h后用材料力学试验机检测两种材料的抗剪切强度 ,统计牙面上粘接材料的残留指数。结果　 2种粘接材料的抗剪切强度相似 [玻璃离子粘固剂为 (6 86 2±2 142 )MPa,复合树脂粘接剂为 (7 183± 3 2 0 5 )Mpa],差异无显著性。结论　体外研究中 ,树脂改良型玻璃离子粘固剂的抗剪切强度已达到复合树脂釉质粘接剂的水平 ,具有临床应用前景     

两种树脂材料“贴面”的临床效果比较

<正> 几年来笔者采用化学固化复合树脂和光固化复合树脂,两种树脂材料对着色牙进行贴面修复作一比较。临床资料我们使用的化学固化复合树脂是EB型树脂,对84颗斑釉牙和四环素牙作唇侧贴面修复以改善色泽与外形、观察1年后复查结果见表     

老年人根面龋光固化树脂改良型玻璃离子充填效果观察

目的：观察光固化树脂改良型玻璃离子充填老年人根面龋的临床效果。方法：100名根面龋老年患者采用自身左右半口对照,随机分为对照组和实验组,分别采用光固化树脂改良型玻璃离子及复合树脂充填,比较二者6个月及1年后的治疗效果。结果：根面龋充填6个月后,采用光固化树脂改良型玻璃离子充填的成功牙数及成功牙面均优于采用复合树脂侧,差异有显著性意义;根面龋充填1年后,采用光固化树脂改良型玻璃离子充填的成功牙数及成功牙面均优于采用复合树脂侧,差异有显著性意义。结论：光固化树脂改良型玻璃离子是治疗老年人根面龋的有效方法之一,值得推广和应用。     

CC—4型BA复合树脂的性能及临床应用特点

通过与MMA系粉液型复合树脂的力学性能、粘结强度及临床操作性能比较,CC—4型BA复合树脂优于对比材料;冷热循环、耐水试验结果显示,其粘结性能稳定。     

牙科纳米氧化铝复合树脂的制备与性能研究

目的 制备一种新型的光固化纳米氧化铝复合树脂,探讨其用于口腔临床的可行性。方法 以双酚A双甲基丙烯酸缩水甘油酯(Bis-GMA)为树脂基质,甲基丙烯酸羟乙酯(HEMA)为活性稀释剂,添加纳米氧化铝填料对树脂基质进行增强增韧改性,制备一种新型牙科纳米氧化铝复合树脂,并表征其固化程度、弯曲强度、硬度、断面形貌、耐磨性、吸水性与水溶解性。结果 添加纳米氧化铝能提高复合树脂材料的刚性和硬度,当添加量达到3wt%时,复合树脂的力学性能、吸水和溶解性能均为最优。结论 复合树脂中加入一定比例的纳米氧化铝可达到增韧和耐磨的效果,该研究为开发新型牙科复合树脂提供了理论和实验基础。     

玻璃离子垫底光固化树脂修复牙体缺损184例疗效观察

玻璃离子垫底光固化树脂修复牙体缺损１８４例疗效观察江苏省锡山市口腔医院李刚可见光固化复合树脂及玻璃离于粘固粉广泛应用于临床已２０年，因其操作简单、省时、美观及物理性能较好等优点而深受欢迎。作者自１９９２年起采用玻璃离子粘固粉垫底，光固化复合树脂覆盖修...     

含长链烷基季铵盐的纳米抗菌无机填料的合成及其在牙科复合树脂中的应用研究

目的 设计合成新型的含长链烷基季铵盐的纳米抗菌无机填料,以赋予牙科复合树脂更优良的抗菌性能。方法 在分子设计和筛选的基础上,制备了长链烷基季铵盐修饰的纳米抗菌二氧化硅填料,并对填料的抗菌性能进行评价。为进一步提高抗菌填料与树脂的结合力,采用硅烷偶联剂对抗菌填料表面进行了处理,并用红外光谱法对其结构特征进行分析;然后将新型纳米抗菌无机填料加入牙科复合树脂中,观察其在复合树脂基体中的分散情况,同时与商品化的Tetric N-Ceram纳米瓷化复合树脂进行对比;并以变异链球菌为对象,研究复合树脂的抗菌性能。结果 长链烷基季铵盐成功接枝到纳米二氧化硅颗粒表面;新型纳米抗菌无机填料的抗菌性能优于含短链烷基季铵盐的抗菌无机填料;偶联处理后的纳米抗菌无机填料在树脂基体中分散均匀,与树脂结合紧密,与Tetric N-Ceram纳米瓷化复合树脂类似;改性后的复合树脂抗菌性能良好。结论 含长链烷基季铵盐的纳米抗菌无机填料抗菌性能良好,经过表面偶联处理后可以很好地与牙科复合树脂共混,提高了牙科复合树脂的抗菌性能。     

The Effects of a Commercial Aluminum Airpolishing Powder on Dental Restorative Materials

INTRODUCTION: JET-Fresh (Dentsply International, York, PA), a new airpolishing powder that contains aluminum trihydroxide as the abrasive agent, has been introduced for use with Prophy-Jet trade mark (Dentsply International). PURPOSE: The aim of this study was to investigate the surface effects of aluminum trihydroxide airpolishing powder on a series of restorative materials. MATERIALS AND METHODS: A total of 6 Class V preparations with enamel margins were created on the buccal surface of extracted human molars. The preparations were restored with Type III gold, a high copper spherical alloy amalgam, porcelain, a light-activated hybrid composite material, a light-activated microfilled composite material, and a light-activated, resin-modified glass ionomer material. The distal half of each restoration was covered with fiberglass tape and the mesial half subjected to treatment with the aluminum trihydroxide powder via the Prophy-Jet for 5 seconds. After removal of the protective tape, the buccal surface of each treated tooth was replicated with impression material. Replicas were generated using epoxy resin and prepared for evaluation with scanning electron microscopy. RESULTS: The aluminum trihydroxide produced surface alterations that were apparent visually and when viewed by a scanning microscope of the hybrid and microfilled composites and the glass ionomer restorations. The surfaces of the amalgam and gold restorations were altered, but not to the extent that the resin-based materials were. No disruption of the surface characterization of the porcelain was detected; however, with gold and porcelain materials, the aluminum trihydroxide removed notable amounts of the luting cements (the results are consistent with the data gathered with sodium bicarbonate powder). CONCLUSION: Aluminum trihydroxide as the abrasive agent in an airpolishing system should be avoided on resin composites, resin-modified composites, and around the margins of cemented restorations.     

Bond strengths between composite resin and auto cure glass ionomer cement using the co-cure technique

BACKGROUND: The clinical technique for sandwich restorations prescribes etching initially set auto cure glass ionomer cement (GIC) prior to placing a layer of resin bond to develop a weak mechanical bond between composite resin and GIC. Co-curing a resin modified glass ionomer cement (RMGIC) bond and composite resin to GIC may create a chemical bond and improve the bond strengths between these two materials. METHODS: A total of 48 specimens were prepared, 12 in each of four categories. Capsulated GIC was placed into a mould and allowed to set for four minutes, etched for five seconds followed by placement of a resin bond and photo cured for five seconds over which a composite resin was puddled onto the resin bond and photo cured for 10 seconds. Capsulated GIC was placed into a mould and allowed to set for four minutes after which a sample of RMGIC (Riva LC) was prepared using twice the liquid powder ratio and painted over the surface of the set GIC using a micro brush. An increment of composite resin was added over the RMGIC and both materials were photo co-cured for 10 seconds. Capsulated GIC was placed into a mould and RMGIC (Riva LC) that had been prepared using twice the liquid powder was brushed over the GIC (prior to initial set) followed by the placement of a layer of composite resin and photo co-cured for 10 seconds. Capsulated GIC was placed into a mould and RMGIC (Fuji II LC) that had been prepared using twice the liquid powder was brushed over the GIC (prior to initial set) followed by the placement of a layer of composite resin and photo co-cured for 10 seconds. Shear testing of each of the samples was carried out and specimens were examined to determine the nature of the fracture. Selected samples were prepared for SEM investigation to observe the interfaces between the GIC and composite resin. RESULTS: There were significantly lower bond strengths (P < 0.05) amongst samples that had been etched and bonded (2.42MPa) compared to the other samples that had been co-cure bonded with RMGIC (6.48-7.05MPa). There were no significant differences amongst the bond strengths of the samples co-cure bonded with RMGIC. Specimens prepared by the 'etch and bond' technique failed adhesively and co-cured specimens failed cohesively within the GIC. SEM investigation showed chemical bonds between RMGIC bond and GIC and composite resin. CONCLUSIONS: The co-cured RMGIC bonding system eliminates several placement steps and produces a significantly stronger chemical bond between GIC and composite resin than the 'etch and bond' technique. RMGIC bond and composite resin may be co-cured to GIC either before or after initial set has occurred.     

Nitrogen doped titanium dioxide as an aesthetic antimicrobial filler in dental polymers

ObjectiveTo develop an aesthetic resin composite using a nitrogen-doped titanium dioxide (NTiO₂) filler that possesses antimicrobial properties against cariogenic bacteria.MethodsN-TiO₂ powder was manufactured by calcining commercial TiO₂ with urea. Free radical release from the N-TiO₂ powder under visible light irradiation was analysed using UV-Vis spectrophotometry. The N-TiO₂ powder was incorporated into a dental resin and the photocatalytic activity assessed using a dye under both visible light and dark conditions. Using XTT assay to measure the cellular metabolic activity, the antibacterial properties of the N-TiO₂ /resin composite discs were tested using Streptococcus mutans.ResultsDoping nitrogen of TiO₂ resulted in a band gap shift towards the visible light spectrum, which enabled the powder to release reactive oxygen species when exposed to visible light. When incorporated into a dental resin, the N-TiO₂/resin composite still demonstrated sustained release of reactive oxygen species, maintaining its photocatalytic activity and showing an antibacterial effect towards Streptococcus mutans under visible light conditions.SignificanceN-TiO₂ filled resin composite shows great promise as a potential aesthetic resin based adhesive for orthodontic bonding.     

Restoration of badly-broken down and endodontically treated teeth

Restorations of badly-broken down and endodontically treated teeth are composite resin; pin-retained amalgam or composite resin; casting onlay; prefabricated post with amalgam/composite resin/glass ionomer cement with silver powder core, and cast post & core with crown. The appropriated material and method depend on type, function and remaining tooth structure as well as tooth prognosis and economic status of the patients.     

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。     

个性化复合树脂分层修复比色板的设计与临床应用

目的 为方便临床医师在应用复合树脂修复牙齿缺损时进行比色,设计一种牙科复合树脂分层修复比色系统.方法 本比色系统包括比色板底板,复合树脂比色片及比色片制作模具3个部分,可以实现对牙齿不同位置进行精准比色并定量明确各区域所使用树脂的种类及对应的厚度.选取54名患者的87颗缺损前牙,分别使用个性化比色板+分层复合树脂修复及...     

Intracanal reinforcement fiber in pediatric dentistry: a case report.

A technique for the restoration of carious primary maxillary incisors using indirect resin composite crowns and intracanal reinforcement fiber is described. Endodontic treatment was previously performed on each tooth. The advantages of using an intracanal reinforcement fiber include resin composite crown reinforcement, translucency, and relative manipulation facility. In addition, the use of indirect resin composite crowns provides good shape and esthetics, as well as reduced chair time for the child. The technique is illustrated in a case report in which indirect resin composite crowns and an intracanal reinforcement fiber are placed in a 3-year-old girl.     

复合树脂充填材料的研发策略和进展

复合树脂充填材料是牙体直接粘接修复的首选材料,其良好的性能可以满足临床牙体修复治疗的要求,恢复结构和功能并兼具微创和美观。为进一步提高临床疗效,改善复合树脂材料性能的局限性是根本的解决策略。本文总结目前的研究进展,重点阐述改良复合树脂材料的性能,研发新型复合树脂包括抗菌复合树脂、再矿化生物活性树脂和自修复复合树脂的进展,为新型复合树脂充填材料的研究趋势提供新思路。     

Effects of air polishing on the resin composite–dentin interface

The aim of this study was to examine defect depths and volumes at the resin composite–dentin (R/D) interface after air polishing with different particles and spray angles. Samples were 54 dentin specimens that were formed in saucer-shaped cavities filled with resin composite. Each specimen was air polished with either sodium bicarbonate (NaHCO₃) or one of two glycine (Gly) powders. The air polisher was set at angles of 90° to the interface and at 45° to the interface from both the dentin and resin composite sides. Air polishing with Gly powder produced defects with less depth and volume than NaHCO₃ powder (p < 0.05). Air polishing with a spray angle of 45° to the interface from the resin composite side produced fewer defects (p < 0.05) than polishing from the dentin side. Air polishing to the R/D interface from the resin composite side produced fewer defects to the interface because the hardness of the resin composite was higher than that of dentin.