石英纤维桩对牙体缺损修复的临床疗效评价

目的：探讨石英纤维桩树脂核全冠修复残根、残冠的临床疗效。方法：以96例铸造金属桩核作为对照,随机选择牙体缺损病例61例、89个患牙,行完善的根管治疗后,利用RTD石英纤维桩、Pulpdent双固化树脂核材料恢复桩核,以全瓷冠或贵金属烤瓷全冠修复。分别于修复后1个月、6个月、1年、2年进行随访。结果：石英纤维桩修复后随访2年仅1个发生桩核脱落,1例出现纤维桩折断,89个基牙均未发生根折。总成功率明显高于铸造金属桩修复组（P〈0．05）。结论：石英纤维桩是一种较为理想的桩核修复方法。     

纤维桩结合牙本质肩领修复残根残冠的临床研究

目的研究纤维桩结合牙本质肩领修复残冠残根的临床效果。方法选择65例87颗牙体严重缺损的患牙,至少保留1.5 mm牙本质肩领,使用纤维桩树脂核,后以金属烤瓷全冠对患牙进行修复。患者在6,12,24个月复诊,观察修复效果。结果在所有患牙中有1例因桩冠松动脱落,1例因继发龋导致修复失败。成功率达97.7%。结论纤维桩结合牙本质肩领修复患牙为临床可行修复方法。     

国产陶瓷预成根管桩临床应用的初步评价

目的初步评价新型氧化锆陶瓷预成根管桩修复牙体缺损的临床效果。方法临床收集61例上颌中切牙或尖牙病例,均采用非金属桩+树脂核+全冠修复,其中27例用新型氧化锆陶瓷预成根管桩,34例使用目前临床常用的石英纤维桩。对上述病例修复1年后进行复查。结果 2组患牙均无粘膜过敏反应,且牙齿松动度、牙周探诊深度,X线检查均在正常范围,未出现预成根管桩松动脱落的病例,存留率均为100%。结论新型氧化锆陶瓷预成根管桩和树脂核直接修复前牙缺损初期疗效满意。     

石英纤维桩树脂核全冠修复效果的短期观察

目的 总结分析石英纤维桩树脂核全冠修复的临床效果.方法 选择合适病例,对经过完善根管治疗的40例共98颗牙齿,使用石英纤维桩树脂核,制做全冠(95例全瓷冠),观察3～24个月,评价临床修复效果.结果 出现桩松动1颗,冠松动1颗,牙龈红肿2颗,其余94颗牙未出现冠修复体颜色改变,无冠折、根折及冠或桩的松动,医患双方对修复效果满意.结论 纤维桩具有美观、不易发生根折的优点,但其长期的效果有待进一步观察.     

纤维桩修复前牙残根残冠25例临床报告

目的：观察纤维桩复合树脂材料修复前牙残冠残根的临床应用效果。方法：对25例30个前牙残冠残根,经完善根管治疗后,采用美国TENAX纤维桩及Permacem桩核树脂形成纤维桩树脂核,恢复基牙外形并进行全冠修复。结果：经过1～2年的随访观察,30个牙中有1例于修复后半年出现纤维桩的松动、脱落,无根折、桩折现象发生。结论：纤维桩树脂核修复技术是一种快捷、稳固和符合牙体生理的有效修复方法,且不易造成根管壁折裂,有利于前牙的美观,是金属桩核的良好替代品。     

玻璃纤维桩-树脂核与银汞-银粉玻璃离子桩核修复磨牙残冠的临床研究

目的比较玻璃纤维桩-树脂核与银汞-银粉玻璃离子桩用于磨牙冠缺损的修复效果。方法临床选择55例磨牙缺损患者,共75颗患牙,随机分为两组,玻璃纤维桩-树脂核组共24例29颗患牙,银汞-银粉玻璃离子桩核组31例共46颗患牙,分别进行玻璃纤维桩-树脂核和银汞-银粉玻璃离子桩核全冠修复,2年后对修复效果进行评价。结果玻璃纤维桩-树脂核组有1颗患牙出现根折,成功率96.6%;银汞-银粉玻璃离子桩核组有1颗患牙出现桩折,成功率97.8%,两组均无冠桩脱落,两组成功率差异无统计学意义(χ2=0.161,P>0.05)。结论对于重度磨牙缺损病例,选用玻璃纤维桩-树脂核和银汞-银粉玻璃离子桩核全冠修复均可。     

玻璃纤维桩用于前牙残根、残冠修复的临床观察

目的研究玻璃纤维桩在前牙残根、残冠修复中的临床应用效果。方法临床选择69例患者,共136颗患牙,均为上下前牙残根或残冠,备牙后龈上剩余牙体组织小于3 mm的10颗,备牙后龈上剩余牙体组织3 mm以上者126颗,经过完善的根管治疗,采用玻璃纤维桩制作桩核,Procera氧化锆全冠修复。对修复效果进行随访评价。结果随访12~48个月,未发现根折;131个修复体边缘密合,未见松动,无脱落无继发龋损,牙周健康;有4颗牙发生纤维桩核松动脱落,有1颗纤维桩折断。成功率为96.32%。所有患者对修复体美学效果均感满意。结论对前牙残根残冠使用玻璃纤维桩Procera氧化锆全冠修复美学效果良好,不易造成根折,可以获得较高的成功率,达到满意的修复效果。     

Relyx纤维桩在残根残冠修复中的应用

目的：探讨Relyx纤维桩联合Relyx粘结剂对残根残冠进行桩核全瓷冠修复的临床效果。方法：86例122个已行完善根管治疗的前牙残根残冠,利用Relyx纤维桩联合Relyx粘结剂及树脂核材料形成桩核,再进行全瓷冠修复。治疗完成后6,12个月复查,观察修复效果。结果：6个月时复查,有1例桩冠折断。12个月时复查,122个患牙桩核均无松动及折断。结论：Relyx纤维桩联合Relyx粘结剂及树脂核材料形成桩核,操作简便快捷,桩的粘结力强,纤维桩韧性高,不易发生桩冠脱落及折断,桩及核无色透明,前牙修复美观,是残根和残冠修复的好方法。     

D.T. Light-Post纤维桩修复后牙牙体缺损的临床研究

目的 研究D.T. Light-Post纤维桩用于后牙牙体缺损桩核修复的治疗效果.方法 25例29颗需行牙体缺损修复的上下颌后牙,经完善的根管治疗,使用D.T. Light-Post纤维桩进行桩核修复,观察12～18个月,通过临床和X线检查,评估桩核修复体的疗效.结果 29颗患牙中, 1个桩冠修复体脱落,其余修复体完好,未发生根折和桩折,治疗成功率为96.6%.结论 D.T. Light-Post纤维桩具有良好的力学性能,可用于后牙牙体缺损的桩核修复.     

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目的评价石英纤维增强树脂桩核修复残根、残冠的临床应用效果。方法选择2004年1月至2006年1月于济南市口腔医院修复科就诊的牙体缺损患者98例,共156颗患牙,均为经完善根管治疗的残根、残冠,随机分为石英纤维增强树脂桩核组(49例72颗患牙)和铸造金属桩核组(49例84颗患牙),金瓷冠修复后随诊3年。结果石英纤维增强树脂桩核组无一例根折裂发生,仅有1颗修复体发生桩折断;而铸造金属桩核组发生根折4颗、铸造金属桩核脱落3颗,出现牙龈色素沉着8颗。石英纤维增强树脂桩核组3年修复成功率(71/72,98.6%)明显高于铸造金属桩核组(69/84,82.1%),二者差异有统计学意义。结论石英纤维增强树脂桩核具有良好的美学效果,强度高,抗疲劳、抗腐蚀性及生物相容性好且不易造成根折,是残根、残冠修复的理想选择。     

纤维桩主辅桩在喇叭口状根管桩核修复中的临床效果观察

目的：评价纤维桩主辅桩十全瓷冠修复喇叭口状残冠残根的临床效果。方法：选择28例患者37颗需修复的喇叭口状单根管残冠残根为研究对象。患牙经根管治疗后行纤维桩主辅桩＋复合树脂核及全瓷冠修复,于修复完成后随访18-26个月,评价修复体完整性、边缘适合性、牙周及根尖周组织健康状况等。结果：37个修复体完整,成功率100％;冠边缘适合性好达91．89％,可接受8．11％;色泽匹配好达75．68％;牙龈状况好达83．79％;纤维桩及树脂核无松动、折裂、缝隙等;根尖未见异常,无根折发生。结论：纤维桩主辅桩系统临床修复喇叭口状残冠残根取得良好的临床效果,可作为保存此类残冠残根简便有效的修复方式。     

Effect of post type and restorative techniques on the strain and fracture resistance of flared incisor roots

Restoring flared endodontically treated teeth continues to be a challenge for clinicians. This study evaluated the effect of post types and restorative techniques on the strain, fracture resistance, and fracture mode of incisors with weakened roots. One hundred five endodontically treated bovine incisors roots (15 mm) were divided into 7 groups (n=15). The two control groups were (C) intact roots restored with Cpc (cast posts and core) or Gfp (glass fiber posts). The five experimental groups were (F) flared roots restored with GfpAp (Gfp associated with accessory glass fiber posts), GfpRc (anatomic Gfp, relined with composite resin), and GfpRcAp (anatomized Gfp with resin and accessory glass fiber posts). All teeth were restored with metal crowns. Mechanical fatigue was performed with 3x10(5)/50 N. Specimens were loaded at 45o, and the strain values (μS) were obtained on root buccal and proximal surfaces. Following that, the fracture resistance (N) was measured. One-way ANOVA and Tukey's HSD tests (α=0.05) were applied, and failure mode was checked. No significant difference in strain values among the groups was found. Cpc presented lower fracture resistance and more catastrophic failures in flared roots. Gfp associated with composite resin or accessory glass fiber posts seems to be an effective method to improve the biomechanical behavior of flared roots.     

Prospective clinical trial of polyethylene fiber ribbon-reinforced, resin composite post-core buildup restorations

The aim of this prospective clinical trial was to determine the outcome of polyethylene fiber ribbon-reinforced, resin composite post-and-core restorations used as endodontic buildups to support all-ceramic crowns. A total of 42 teeth (31 anterior, 11 posterior) with a mean follow-up time of 35.85 months (range, 10 to 73 months) were treated with 3-mm-wide polyethylene fiber ribbon-reinforced resin composite as post-and-core material. The posts and cores were assessed by clinical and radiographic examination. During the evaluation period, only 1 dentin-cement failure was observed as a post dislodgement after 11 months of clinical service. Performance of polyethylene fiber ribbon post and resin composite core foundation restorations provided clinically satisfactory support for all-ceramic crowns.     

Fracture resistance of endodontically-treated teeth restored using three root-reinforcement methods

AIM: The aim of this in vitro study was to compare the fracture resistance of endodontically-treated anterior teeth with their roots reinforced using three different restorative methods. METHODS AND MATERIALS: Forty sound maxillary human central incisors were randomly assigned to four groups (n=10). The crowns of the teeth were removed at a level 2 mm incisal to the cementoenamel junction (CEJ). After root canal therapy, flared canals were simulated in three groups. In the first, second, and third groups the flared canals were reinforced with resin composite (RCO) (Clearfil DC Core Automix), two Reforpins (REF), and a resin cement (RCE) (Panavia F 2.0), respectively. In the fourth (DEN) group flared canals were not created. The same size fiber reinforced composite (FRC) posts were cemented with resin cement (Panavia F 2.0) in all groups. After post cementation and restoration of the teeth crown with a core build-up composite (Clearfil Photo Core), the roots of the teeth were embedded in acrylic resin blocks up to 1 mm below the CEJ. The samples were loaded in an Instron testing machine with a crosshead speed of 0.5 mm/min at a 45 angle to the long axis of the tooth on the palatal surfaces until failure occurred. Data were analyzed using the Kruskal-Wallis, Mann-Whitney, and Chi-square tests (p=0.05). RESULTS: Significant differences were found between fracture resistance in all of the groups (P<0.05) with the exception being among the RCO and REF groups. The least mean value 230 (130) N and the highest mean value 830 (220) N were shown in the fracture resistance of the RCE and DEN groups, respectively. CONCLUSION: Reforpin can be used as an alternative to resin composite for internal reinforcement of weakened roots according to the results of this study. For reinforcement of flared canals, fiber posts along with Reforpin or resin composite proved to have higher fracture resistance than resin cement. Non flared canals had the highest fracture resistance.     

三种桩核系统修复后牙体组织抗疲劳强度体外研究

目的:比较两种纤维根管桩核系统和金属铸造桩核修复后牙体组织的抗疲劳强度和破坏模式。方法:2 4个离体上颌中切牙常规根管治疗术后截除牙冠,随机等分成A、B、C三组,A组用AESTHETI -PLUS石英纤维桩、复合树脂核系统及烤瓷冠修复,B组用C- POST碳纤维桩、复合树脂核系统及烤瓷冠修复,C组用Cr -Co铸造金属桩核进行桩核及烤瓷冠修复,包埋于底座后进行抗疲劳强度的测试,最多测试次数约10 0万次或试件破坏,记录试件破坏时的加载次数以及试件破坏的模式。结果:三种桩核系统修复后的离体牙中均有发生根折,但根折的部位不同,A组另有2个离体牙出现树脂核与牙本质分离,B组另有1例出现树脂核与牙本质分离,而C组除2例根折外,其余6个离体牙未出现明显的牙体组织或修复体的破坏。结论:Cr Co铸造金属桩核系统是一种较为成熟的桩核系统,AESTHETI- PLUS石英纤维桩和C POST碳纤维桩核系统具有一定的临床应用前景,但临床使用纤维桩时仍应考虑其他因素对修复效果的影响。     

三种方法修复薄弱根管冠方微渗漏的体外评价

目的评价可塑型纤维桩、预成纤维桩及根管重塑后预成纤维桩修复薄弱根管后的冠方微渗漏情况。方法选择正畸拔除上颌第一前磨牙36颗,制备形成薄弱根管。将30颗样本牙随机分为3组,A组可塑型纤维桩核系统修复、B组根管重塑后预成纤维桩核系统修复,C组预成纤维桩核系统修复,另外6颗为对照组。所有样本进行5℃-55℃冷热循环5000次后,置于0．5％碱性品红溶液中24h。将试件纵向剖开为2部分,在体视显微镜下观察各剖面修复材料与根管壁之间的微渗漏情况。用Kruskal—Wallisf法进行统计分析。结果3种方法修复后修复材料与根管牙本质之间均存在微渗漏现象,3组间无统计学差异（P〉0．05）。结论在本实验条件下,3种方法修复薄弱根管对冠方微渗漏的影响相近。     

不同材料修复残根、残冠的疗效评价

目的：比较银汞合金与复合树脂修复磨牙残根、残冠的疗效。方法：选取因患龋而成残根、残冠的下颌第一磨牙100个,在根管治疗术后,采用钉固位,分别以银汞合金或复合树脂修复,各50个牙,比较其疗效。追踪复查2年后的治疗效果。结果：银汞合金修复者,优45牙（90％）,一般4牙（8％）,失败1牙（92％）。复合树脂修复者,优40牙（80％）,一般6牙（10％）,失败4牙（8％）。两者成功率X^2检验,P＞0．05。结论：银汞合金修复与复合树脂修复残根、残冠的疗效相差无显著性。     

Resistance to cyclic fatigue and fracture of structurally compromised root restored with different post and core restorations

The aim of this study was to evaluate the resistance to fracture of endodontically treated teeth with flared canals restored with different post and core restorations under static and cyclic fatigue loadings. Sixty human maxillary central incisors were used. Two main groups (non-ferrule and 1-mm ferrule) were divided into three types of restoration: custom cast post-and-core (MPC), resin composite post-and-core (RCP), and resin composite core in combination with prefabricated carbon fiber post (FRC). Half of each group was subjected to a static loading test, and the other to a cyclic fatigue test. FRC exhibited a significantly higher number of load cycles than the other groups, and MPC showed the highest failure load among the tested groups. However, all FRC and MPC specimens demonstrated unfavorable root fractures. The results of this study suggested that RCP prepared with 1-mm ferrule was the most desirable restoration for structurally compromised roots, as relatively strong resistance to cyclic fatigue and fracture was revealed--given that all RCP specimens demonstrated favorable root fracture.     

玻璃纤维桩在磨牙残冠桩核冠修复中的临床应用

目的探讨玻璃纤维桩在磨牙残冠修复治疗中的临床效果。方法选择35例患者的44颗磨牙残冠为研究对象。44颗磨牙残冠经完善的根管治疗后,选择玻璃纤维制桩的数目和长度,再烤瓷冠修复,并经过6个月～2年临床疗效的追踪观察。结果44颗患牙有42颗无异常,2颗因纤维桩脱落和基牙牙龈炎而失败,修复成功率为95.45%,修复效果满意。结论玻璃纤维桩在磨牙残冠的修复治疗中,能达到良好的修复效果。     

Fracture resistance of pulpless teeth restored with post-cores and crowns.

OBJECTIVES: The present study was designed to test the null hypothesis that there is no difference in the fracture resistance of pulpless teeth restored with different types of post-core systems and full coverage crowns. METHODS: Extracted human upper premolars were restored with a fiber post, prefabricated metallic post or cast metallic post-core. Teeth with full crown preparations without post-core restorations served as a control. All teeth were restored with full coverage crowns. A 90-degree vertical or 45-degree oblique load was applied to the restored teeth with a crosshead speed of 0.5 mm/min, and the fracture loads and mode of fracture were recorded. RESULTS: Under the condition of vertical loading, the fracture load of teeth restored with the cast metallic post-cores was greatest among the groups (two-factor factorial ANOVA and Scheffe's F test, P<0.05). All fractures in teeth restored with all types of post-core systems propagated in the middle portions of roots, including the apices of the posts. Under the condition of oblique loading, the fracture load of teeth restored with pre-fabricated metallic posts was significantly smaller than that in other groups. Two-thirds of fractures in the fiber post group propagated within the cervical area, while most fractures in other groups extended beyond the middle of the roots. SIGNIFICANCE: From the results of the present investigations, it was concluded that under the conditions of vertical and oblique loadings, the combination of a fiber post and composite resin core with a full cast crown is most protective of the remaining tooth structure.