3种纳米粒子对高强玻璃纤维增强EAM树脂复合材料桩钉基体树脂力学性能的影响

目的　研究 3种纳米粒子对新研制的高强玻璃纤维增强EAM树脂复合材料 (FRC)桩钉基体树脂力学性能的影响。方法　将 3种纳米粒子 (纳米SiO2 、纳米TiO2 、纳米Al2 O3 )用KH - 5 70进行表面处理后 ,将之均匀分散到FRC桩钉基体树脂(EAM树脂 )中 ,按照一定工艺进行固化 ,根据国家标准测试基体树脂的力学性能。结果　不同纳米粒子及其含量对FRC桩钉基体树脂的影响不同 ,纳米SiO2 与TiO2 增强增韧效果显著 ,纳米SiO2 的含量为 3%时 ,基体树脂综合性能最佳。结论　少量的纳米粒子可改善树脂的力学性能 ,不同的纳米粒子对树脂的影响不同     

纤维/树脂复合材料桩钉系统研究进展

纤维/树脂复合材料桩钉具有与牙本质相似的弹性模量,良好的生物相容性,较高的机械性能等特点,玻璃纤维及石英纤维桩还具有较高的美学价值。本文就纤维/树脂复合材料桩钉的性能,临床应用及研究进展做一综述。     

纤维／树脂复合材料桩钉系统研究进展

纤维／树脂复合材料桩钉具有与牙本质相似的弹性模量，良好的生物相容性，较高的机械性能等特点，玻璃纤维及石英纤维桩还具有较高的美学价值。本文就纤维／树脂复合材料桩钉的性能，临床应用及研究进展做一综述。     

高强度纤维桩树脂核的临床应用研究

目的研究高强度纤维桩树脂核的临床修复效果。方法对64例患者156颗上下颌前牙残冠、残根,经完善的根管治疗后,采用制作纤维桩树脂核恢复基牙外形并行全瓷冠修复。结果经过0.5～2.0年的随访观察,结合临床及X线检查,修复成功率为96.6%,且无冠变色、根折、桩折现象的发生。结论高强度纤维桩树脂核具有良好的美学效果,且不易造成根管壁折裂。     

五种黏固剂下纤维/树脂复合材料桩钉固位力的研究

目的 比较纤维/树脂复合材料(FRC)桩钉在5种黏固剂下的固位力。方法 将FRC桩钉用5种黏固剂(磷酸锌水门汀、玻璃离子水门汀、聚羧酸水门汀、EB复合树脂、AB组份复合树脂)分别黏固于新鲜离体上前牙牙根内,在电子力学试验机上测试其固位力。结果 FRC桩钉在不同黏固剂下与根管的固位力由大到小的顺序是:AB组份复合树脂>玻璃离子水门汀>EB复合树脂>聚羧酸锌水门汀>磷酸锌水门汀。AB组份复合树脂的固位力最大,为(418.14±23.40)N。结论 新研制的FRC桩钉的固位力可以满足临床需要。     

桩核材料与纤维/树脂复合材料桩钉联合修复无髓牙的抗折性能研究

目的评价3种树脂类桩核材料与高强玻璃纤维/树脂复合材料(FRC)桩钉联合修复无髓牙的抗折性能。方法用FRC桩钉和3种经不同方法处理(热压和未热压)的树脂核(Artglass聚合体、Charisma复合树脂、AB组份复合树脂)联合修复离体无髓牙根,测试1300加载时的破坏载荷。结果Artglass聚合体组的抗折力最高(505.4N),经热压处理后强度明显提高(564.1N) ; Chari~复合树脂组经热压后脆性增加,强度降低(热压前后分别为411.3N和 315.3N); AB组份树脂组经热压后强度明显提高(热压前后分别为358.4N和423.4N)。实验中无1例出现桩钉折断和聚酷冠碎裂。结论不同桩核材料与FRC桩钉联合修复无髓牙的抗折力不同,其中Art乡ass聚合体组的抗折力最高,但是此3组的抗折力均超过了咀嚼过程中前牙的咬合力,树脂核与纤维/树脂复合材料桩钉联合修复无髓前牙残根可以满足临床需要。     

纤维桩钉在残根残冠保存修复中的应用

目的探讨纤维/树脂复合材料桩钉在残根残冠修复中的临床应用效果。方法用自行研制的纤维桩对69例患者的77个残根残冠进行修复,并对临床应用的有关问题进行分析。结果通过0.5~2.0年的观察,除1件修复体桩钉在修复后半年脱落外,其余修复体无1例桩钉折断或脱落。结论纤维桩钉具有较好的美观效果和强度,在掌握好适应证的前提下,可以满足前、后牙修复的需要。     

新型齿科纤维/树脂桩钉的应用设计及性能研究

目的 :研制一套弯曲的更方便临床应用的新型齿科纳米复合材料桩钉。方法 :筛选材料的最佳配方 ,压制一套弯曲角分别为 5°,10° ,15°的纳米蒙脱土 /S -GF/EAM桩钉。应用三点弯曲试验比较新型桩钉与现有成品纤维桩钉的机械性能。结果 :当纤维含量在 6 5wt%～ 75wt%时 ,复合材料的性能最佳。除 15°桩钉外 ,新型桩钉与现有成品纤维桩钉相比 ,弯曲性能无显著性差异 (P >0 .0 5 )。结论 :复合材料桩钉的弯曲角度应控制在 15°以内。     

Comparison of Fracture Resistance Strength of Six:Non-metal:Dental Posts under the Oblique Load in Vitro

目的:测试6种非金属桩钉的抗折性能,以了解不同桩钉的强度,从而指导临床合理选择桩钉.材料:将36件桩钉按种类分为6个实验组(n=6):A组:Parapost fiber(Whaledent Cohene);B组:Aesthetic Plus(Bisco);C组:Cosmopost(Ivoclar Vivadent);D组:Exper-fiber A(NWPU);E组:Exper-fiber B(NWPU);F组:Exper-fiber C(NWPU).将待测的桩钉固定于特别加工的夹具中,用通用电子力学试验机测试桩钉在135°单端受力时的破坏载荷,对结果进行方差分析和SNK检验.结果:不同种类桩钉的抗折力不同,Exper-fiber A posts和Exper fiber B posts的抗折力无显著差异,分别是(87.21±3.12)N和(89.26±1.72)N.与其他组相比Exper-fiber C posts的抗折力最高为(99.93±1.97)N.Parapost-fiber组的抗折力最低为(47.07±1.36)N.结论:不同种类非金属桩钉的抗折力不同,临床使用中应根据实际受力情况合理选择.     

纤维——树脂复合材料在固定修复中的应用

纤维增强高分子基复合材料（FRC）作为一种结构性材料,具有低密度、高强度、高模量、耐腐蚀的优点。本文就FRC在口腔固定修复领域,包括牙周夹板的制作、无金属冠、桥修复、核桩修复等方面的应用及研究,作了主要介绍,认为FRC在口腔固定修复领域具有一定的临床应用价值。     

Flexural strength of glass fibre‐reinforced posts bonded to dual‐cure composite resin cements

Davis P, Melo LSD, Foxton RM, Sherriff M, Pilecki P, Mannocci F, Watson TF. Flexural strength of glass fibre‐reinforced posts bonded to dual‐cure composite resin cements. Eur J Oral Sci 2010; 118: 197–201. © 2010 The Authors. Journal compilation © 2010 Eur J Oral Sci The aims of this study were to evaluate the flexural strength of two different types of glass fibre‐reinforced posts bonded to dual‐cure composite resin cements. Forty glass methacrylate‐based fibre posts (GC Fiber Post) and 20 glass fibre inter‐polymerizing network posts (everStick POST) were divided into three groups. Group 1 contained 20 GC posts that were bonded to a dual‐cure composite cement (UnifilCore). Group 2 contained 20 Stick Tech posts that had adhesive applied (Scotchbond Multipurpose resin) and were bonded to a dual‐cure composite resin cement (RelyX Unicem). Group 3 contained 20 GC posts that were pretreated with a silane‐coupling agent before being treated with resin and composite, as in group 1. A 4‐point bend test was carried out to failure on all of the groups. Failure modes were determined using scanning electron microscopy. Pretreatment of the post surface with the silane‐coupling agent did not increase the flexural strength. The flexural strength of the Stick Tech post was significantly lower than the flexural strength of the GC post. The mode of failure for the GC Posts was adhesive, whereas the Stick Tech posts failed cohesively. Different flexural strengths and failure modes were observed among the two fibre post–resin systems.     

硫酸钡改性纤维桩与树脂核材料的粘接强度研究

目的:研究硫酸钡改性纤维桩与3种树脂核材料的微拉伸粘接强度.方法:自研制硫酸钡改性玻璃纤维桩(J Fiber-post,JFP)与商品纤维桩(DT Light post,LP)各12根,随机分成3组.桩周分别用2种双固化树脂 Clearfil DC core(CD),Rebilda DC (RD)与光固化树脂/粘接剂:...     

Carbon fiber reinforced root canal posts Mechanical and cytotoxic properties

The aim of this study was to compare the mechanical properties of a prefabricated root canal post made of carbon fiber reinforced composites (CFRC) with metal posts and to assess the cytotoxic effects elicited. Flexural modulus and ultimate flexural strength was determined by 3 point loading after CRFC posts had been stored either dry or in water. The bending test was carried out with and without preceding thermocycling of the CFRC posts. The cytotoxicity was evaluated by an agar overlay method after dry and wet storage. The values of flexural modulus and ultimate flexural strength were for dry stored CFRC post 82±6 GPa and 1154±65 MPa respectively. The flexural values decreased significantly after water storage and after thermocycling. No cytotoxic effects were observed adjacent to any CFRC post. Although fiber reinforced composites may have the potential to replace metals in many clinical situations, additional research is needed to ensure a satisfying life-span.     

三种复合树脂与玻璃纤维桩的微拉伸强度研究

目的：3种复合树脂材料与玻璃纤维桩微拉伸粘结强度的对比研究。方法：45个Parapost玻璃纤维桩随机分为3组，分别用3种不同的复合树脂：可乐丽菲露AP-X^TM、Ceram—X、ParaCore双重固化复合树脂桩核材料粘固制成桩核样本，制备好的样本切割成截面为1．0mm×1．0mm的条状试件用于微拉伸强度测试。结果：ParaCore与Ceram—X的微拉伸粘结强度显著高于AP-X^TM（P〈0．05），ParaCore和Ceram—X与纤维桩的微拉伸粘结强度没有显著性差异（P〉0．05）。结论：ParaCore与Ceram-X与玻璃纤维桩的粘结性能较好，适于临床塑核使用。     

Adhesion between glass fiber posts and resin cement: evaluation of bond strength after various pre-treatments

Purpose. To evaluate surface roughness and bond strength of glass fiber posts to a resin cement after various surface treatments. Materials and methods. Sixty individually formed glass fiber posts with a diameter of 1.5 mm and a length of 20 mm were used for this study. They were randomly assigned to six groups of pre-treatment (n = 10/group): 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. The posts were then bonded to resin cement and tensile bond strengths were determined in a universal testing machine. For statistical analysis, two-way ANOVA and post-hoc comparison tests (α = 0.05) were performed. Results. The highest bond strength value was observed in group HF, followed by group SC. There was a statistically significant difference in bond strength between group C and groups HF, SC and E (p < 0.001, p = 0.002 and p = 0.041, respectively). Posts of group SB and group N showed the highest surface roughness. Conclusions. The findings of the present study reveal that hydrofluoric acid-etching, silica coating and Er:YAG laser irradiation provided a significant increase in bond strength between glass fiber posts and resin cement.     

不同树脂核材料与纤维桩抗拉强度的实验研究

目的:研究不同种类树脂核材料与纤维桩的粘接性能.方法:用4 种树脂核材料(Multicore Heavy Body、LuxaCore、LIGHT-CORE、Z100)在纤维桩上分别制作桩核粘接试件,电子力学试验机测试抗拉强度,扫描电镜观察粘接界面.结果:不同树脂核材料与纤维桩的抗拉强度差异有显著性(P<0.05),其中LuxaCore粘接力均值最大,为(15.45±0.75) MPa;Z100粘接力最小,为(13.14±0.52) MPa.扫描电镜观察显示,Z100混合填料型复合树脂与纤维桩表面结合较差,结合界面有明显裂纹;LuxaCore双固化树脂核材料与纤维桩表面的结合较好,结合界面无明显裂纹.结论:树脂核材料种类对纤维桩树脂核粘接力有显著影响,流动性好的双固化树脂核材料(LuxaCore,Multicore Heavy Body)粘接性能优于光固化树脂核材料(LIGHT-CORE,Z100).     

碳纤维根管桩的研制

目的研究高强度碳纤维增强复合树脂根管桩的加工成型工艺.方法用湿法制备碳纤维预浸料,在预成型模具中预成型,然后在成型模具中经特殊的工艺进行成型,最后用车床加工成预定形状的桩钉;并测试其弯曲强度、剪切强度和碳纤维含量.结果随着碳纤维含量的增加,根管桩的弯曲强度和剪切强度均逐渐增加.碳纤维含量达到67.13%时,弯曲强度和剪切强度分别达到406MPa和653.86MPa.结论高强度的碳纤维根管桩可以满足临床需要.     

双锥度玻璃纤维桩修复牙体缺损的效果评价

目的 评估双锥度玻璃纤维桩修复牙体缺损的效果。方法 选择2011年3月至2013年2月在我院修复科门诊进行治疗的108例牙体缺损患者,根据随机数字表分为观察组和对照组,每组各54例,对照组采用平行玻璃纤维桩进行修复,观察组采用双锥度玻璃纤维桩进行修复。对两组患者的临床疗效、咀嚼效率、满意度等进行评估。结果 修复12个月后,观察组患者牙根折裂,牙龈边缘变色发生率均显著低于对照组（P<0.05）。对照组患者修复后6个月咀嚼效率显著低于观察组（P<0.05）。观察组患者牙龈指数优于对照组（P<0.05）,牙齿松动度低于对照组（P<0.05）。修复12个月后,患者对修复的满意度高于对照组（P<0.05）。结论 双锥度玻璃纤维桩在修复牙体缺损时具有更好的临床疗效和美观效果,显著提高患者满意度,在牙体缺损修复中具有较好的应用前景。     

三种树脂水门汀与纤维桩粘接强度的研究

目的:比较三种不同粘接系统的树脂水门汀与纤维桩的剪切粘接强度.方法:将30颗完善根管治疗后的离体牙分成三组(n=10),分别使用全酸蚀(One-Step Plus/Duolink,OD),自酸蚀(ParaCore Automix,PA),自粘接(RelyXTM Unicem,RU)三种粘接系统的树脂水门汀粘接玻璃纤维桩...