纤维树脂桩核固位的研究进展

纤维树脂桩核以其诸多的优点得到越来越多口腔医生的关注和广泛的临床应用。纤维树脂桩核成功应用于临床的重要保证之一是可靠的固位,因此,学者们对纤维树脂桩核的固位进行了大量的研究。本文就近年来有关纤维树脂桩核固位的研究作一综述。     

纤维桩表面处理改善其树脂粘接强度的研究进展

纤维桩具有与牙本质弹性模量相近及良好的美学性能等优点,在口腔修复学的临床工作中得到了广泛地应用。然而纤维桩的粘接强度尚不十分理想,这也成为了纤维桩修复治疗中的最大隐患。因此,通过表面处理提高纤维桩与树脂材料的粘接强度成为了近十余年来国内外的研究热点。以往研究中使用的表面处理方法主要包括硅烷偶联剂及树脂粘接剂的应用,氢氟酸、过氧化氢溶液的表面蚀刻以及喷砂、硅酸盐喷涂等。这些表面处理方法使纤维桩的粘接强度得到了一定程度的提高。此外,近年来的一些研究报道中,紫外线和低温等离子体等物理方法的应用也有效地提高了纤维桩的粘接强度,可能成为未来的研究发展方向。     

纤维／树脂桩核的粘接与固位

采用树脂基复合材料制作的纤维桩以优良的理化性能逐渐得到推广和应用，纤维桩采用粘接性树脂水门汀与根管粘接，以树脂材料作核，目前对纤维／树脂桩核的研究热点集中于粘接和固位的研究，本文对此作一综述。     

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:...     

纤维/树脂桩核的粘接与固位

采用树脂基复合材料制作的纤维桩以优良的理化性能逐渐得到推广和应用,纤维桩采用粘接性树脂水门汀与根管粘接,以树脂材料作核,目前对纤维/树脂桩核的研究热点集中于粘接和固位的研究,本文对此作一综述.     

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...     

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).     

桩道酸蚀处理对自粘接树脂水门汀与纤维桩粘接性能影响的研究

目的：比较桩道表面酸蚀处理对自粘接树脂水门汀RelyX Unicem与纤维桩之间粘接效果的影响。方法：选取36颗新鲜拔除的无龋坏单根管人前磨牙,常规根管充填与桩道预备后,使用磷酸酸蚀桩道,根据酸蚀时间的不同将试件随机分为3组（n＝12）：不酸蚀组（对照组,Et0）、酸蚀5秒组（Et5）、酸蚀20秒组（Et20）。各组试件粘接纤维桩后进行微推出粘接强度测试,扫描电镜（SEM）下观察粘接界面超微结构,X－射线能谱（EDX）分析粘接界面牙本质侧元素百分比含量。结果：Et0组微推出强度（8．27±1．88 MPa）显著高于Et5组（6．99±2．11 MPa）和Et20组（6．39±1．08 MPa）,差异均有统计学意义（P＜0．05）。Et5组微推出强度高于Et20组,但无统计学差异（P＞0．05）。扫描电镜观察见Et20组单位视野内树脂突数量多于Et0组、Et5组。Et5组和Et20组中可见树脂水门汀与根管牙本质间存在裂隙。X－射线能谱分析显示,随着酸蚀时间的延长,粘接界面处牙本质中钙含量百分比呈逐渐下降的趋势。结论：桩道酸蚀处理不能促进自粘接树脂水门汀RelyX Unicem与纤维桩的粘接效果。     

不同根管清洗方法对纤维桩粘接强度的影响

目的 通过对根管壁内表面进行不同方式的处理来提高纤维桩的粘接强度.方法 36颗新鲜无龋单根管离体前磨牙桩道预备后随机分为6组,分别进行根管内壁处理.Ⅰ组(对照组)使用生理盐水冲洗,Ⅱ组使用2%氯己定溶液和17%乙二胺四乙酸(EDTA)溶液冲洗,Ⅲ组使用3%过氧化氢溶液、17%EDTA溶液冲洗,Ⅳ组使用5.25%次氯酸钠...     

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。     

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纤维桩因其弹性模量与牙本质相当,且具有美观、操作简便等优点,在临床上得到广泛的应用。目前,国内外对纤维桩粘接技术的研究主要集中在纤维桩的表面处理及粘接树脂等方面。本文将对这些方面的研究进展做一综述。     

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目的    观察玻璃纤维桩加树脂核和铸造镍铬金属桩核修复上颌前磨牙的临床效果。方法    对2005年3月至2007年7月在北京市通州区新华医院口腔科行上颌前磨牙桩核冠修复的143例患者的176颗患牙,随机分为A、B两组,各88颗。分别使用玻璃纤维桩加树脂核和铸造镍铬金属桩制作桩核,然后用烤瓷全冠进行修复,随访2年,观察比较临床效果。结果    A组成功86颗,失败2颗,成功率97.7%;B组成功85颗,失败3颗成功率96.6%。两组修复成功率差异无统计学意义（P＞0.05）。结论    玻璃纤维桩加树脂核和铸造金属桩核修复上颌前磨牙,临床效果基本相同。但玻璃纤维桩在失败后的再次修复方面具有铸造桩核不能比拟的优势,因此在上颌前磨牙的桩核修复方面首选玻璃纤维桩。     

不同表面处理的纤维桩微拉伸粘接强度研究

目的:通过微拉伸粘接强度测试法测试在纤维桩表面经过6种不同的处理后与核树脂的粘接强度,探索何种表面处理方法能显著提高纤维桩与核树脂的粘接强度,为临床应用提供参考。方法:将30根石英纤维桩随机分成6组,每组5根。A组纤维桩表面涂布粘接剂,B组涂布硅烷处理剂,吹干后涂粘接剂,C组5%氢氟酸酸蚀30sec,流水冲洗吹干后处理同A组,D组5%氢氟酸酸蚀30sec,流水冲洗吹干后处理同B组,E组24%双氧水处理,后操作同A组,F组24%双氧水处理后操作同B组。在桩周分层固化核树脂,用低速锯沿纤维桩外周平行片切,再垂直粘接面片切成横截面约0.9mm×0.9mm的长方柱状试件,每组15个,用微拉伸粘接强度测试法测试纤维桩与核树脂的微拉伸粘接强度,体视显微镜观察断裂类型。结果:A组微拉伸粘接强度8.78±2.20MPa,B组9.35±1.92MPa,C组15.50±2.87MPa,D组22.98±3.24MPa,E组16.64±2.70MPa,F组24.88±3.9 0MPa。用氢氟酸酸蚀的C组和D组和用双氧水处理的E组和F组的微拉伸粘接强度明显高于A组B组(P<0.05)。用氢氟酸酸蚀后再硅烷化处理的D组比C组、用双氧水处...     

Effect of ascorbic acid,ethanol and acetone on adhesion between the treated fiber posts and composite resin cores

PURPOSE

The aim of the present study was to assess the effect of ascorbic acid, ethanol and acetone on microtensile bond strength between fiber posts pre-treated with hydrogen peroxide and composite resin cores.

MATERIALS AND METHODS

Twenty four fiber posts were pre-treated with 24% hydrogen peroxide and divided into 4 groups as follows: G1: no treatment, as control group; G2: treatment with 10% ascorbic acid solution for 5 minutes; G3: treatment with 70% ethanol solution for 5 minutes; and G4: treatment with 70% acetone solution for 5 minutes. Each fiber post was surrounded by a cylinder-shaped polyglass matrix which was subsequently filled with composite resin. Two sections from each sample were selected for microtensile test at a crosshead with speed of 0.5 mm/min. Statistical analyses were performed using one-way ANOVA and a post hoc Tukey HSD test. Fractured surfaces were observed under a stereomicroscope at ×20 magnification. The fractured surfaces of the specimens were observed and evaluated under a SEM.

RESULTS

Means of microtensile bond strength values (MPa) and standard deviations in the groups were as follows: G1: 9.70±0.81; G2: 12.62±1.80; G3: 16.60±1.93; and G4: 21.24±1.95. G4 and G1 had the highest and the lowest bond strength values, respectively. A greater bond strength value was seen in G3 compared to G2. There were significant differences between all the groups (P<.001). All the failures were of the adhesive mode.

CONCLUSION

Application of antioxidant agents may increase microtensile bond strength between fiber posts treated with hydrogen peroxide and composite cores. Acetone increased bond strength more than ascorbic acid and ethanol.     

新型碳纤维预成桩的临床应用

目的观察自主研制的高强度碳纤维预成桩的临床应用效果。方法观察30例共计45件修复体的使用情况,并对临床应用的有关问题进行分析。结果经过0.5~1.5年的临床观察,桩核无折断或脱落,修复效果满意。结论高强度碳纤维预成桩具有较好的临床修复效果,但仍需进行长期的临床观察。     

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。     

Influence of modification in core building procedure on fracture strength and failure patterns of premolars restored with fiber post and composite core

PURPOSE

The influence of the modified process in the fiber-reinforced post and resin core foundation treatment on the fracture resistance and failure pattern of premolar was tested in this study.

MATERIALS AND METHODS

Thirty-six human mandibular premolars were divided into 4 groups (n = 9). In group DCT, the quartz fibre post (D.T. Light-post) was cemented with resin cement (DUO-LINK) and a core foundation was formed with composite resin (LIGHT-CORE). In group DMO and DMT, resin cement (DUO-LINK) was used for post (D.T. Light-post) cementation and core foundation; in group DMO, these procedures were performed simultaneously in one step, while DMT group was accomplished in separated two steps. In group LCT, the glass fiber post (LuxaPost) cementation and core foundation was accomplished with composite resin (LuxaCore-Dual) in separated procedures. Tooth were prepared with 2 mm ferrule and restored with nickel-chromium crowns. A static loading test was carried out and loads were applied to the buccal surface of the buccal cusp at a 45 degree inclination to the long axis of the tooth until failure occurred. The data were analyzed with MANOVA (α = .05). The failure pattern was observed and classified as either favorable (allowing repair) or unfavorable (not allowing repair).

RESULTS

The mean fracture strength was highest in group DCT followed in descending order by groups DMO, DMT, and LCT. However, there were no significant differences in fracture strength between the groups. A higher prevalence of favorable fractures was detected in group DMT but there were no significant differences between the groups.

CONCLUSION

The change of post or core foundation method does not appear to influence the fracture strength and failure patterns.