热牙胶注射根管充填封闭性的研究

热牙胶注射根管充填封闭性的研究王青熊世江根管充填的封闭性是根管治疗成功的关键之一。近年来国外采用一种新技术，将加热后软化、流动性较好的牙胶用特制注射器注射充填根管。为探讨其根充封闭性，作者将这一方法与国内常用的根充方法进行对比观察，并探讨根管封闭的机...     

热牙胶连续波和热塑注射根管充填的护理配合

目的探讨根管治疗中热牙胶连续波和热塑注射根管充填的护理配合。方法分析临床应用Obtura-tion Unit全能热压根管充填机行热牙胶连续波和热塑注射根管充填56例65颗患牙的护理资料。结果56例65颗患牙在椅旁四手操作护理配合完成根管充填后拍摄X线片,有53例62颗患牙恰填为一次完成充填,3例3颗患牙因欠填需再次充填。结论熟悉四手操作护理配合及掌握热牙胶连续波和热塑注射根管充填技术特点与使用方法,才能更好地协助医生完成根管治疗,提高根管治疗的质量。     

三种热牙胶根管充填技术牙胶充填面积百分数的比较研究

目的:比较3种热牙胶根管充填术后牙胶密度即牙胶充填而积百分数(percentage of gutta-percha-filled area,PGFA),评价3种热牙胶充填技术的充填效果.方法:采用人完整单根管离体牙40颗随机分成4组,根管预备后分别采用冷牙胶侧向加压法、热牙胶垂直加压法、热塑牙胶注射加压法(Obtura Ⅱ)和超声振动侧向加压法进行根管充填.每个根管分别在距离解剖根尖3、6和9 mm处横断,通过图像分析软件记录根管横断面积和牙胶充填的面积,计箅出牙胶充填面积百分数.结果:热牙胶垂直加压组和Obtura Ⅱ组的PGFA显著高于冷牙胶侧压组和超声侧压组(P＜0.05),热牙胶垂直加压组和Obtura Ⅱ组的PGFA之间无显著性差异(P＞0.05),且与根管充填的深度也无明显相关性(P＞0.05).热牙胶垂直加压组和Obtura Ⅱ组的PGFA在9 him和3 mm处明显大于冷牙胶侧压和超声侧压组(P＜0.05);在6 mm处,3种热牙胶的PGFA无显著性差异(P＞0.05).超声侧压组的PGFA与根管深度明显相关(P＜0.05).结论:热牙胶垂直加压法和Obtura Ⅱ允填后牙胶密度高,在9 mm和3mm处效果优于超声振动侧向加压法.超声振动侧向加压法充填效果受到根管深度影响.     

热牙胶连续波充填技术的临床应用

目的：总结热牙胶连续波充填技术的充填质量及临床效果。方法：成人牙髓病及根尖周病30例,常规根管预备,使用热牙胶充填根管,并在治疗后3-6个月进行回访,观察临床疗效。结果：30例中,根充恰填率90％,根管充填后未发生疼痛。x线片显示根充严密合适,咬合关系良好,根尖瘘道2～3周愈合。术后3个月和6个月复查,x线片显示根尖周透射区缩小,骨质密度增加。结论：热牙胶连续波充填技术安全、可靠,操作简便,近期观察临床效果好。     

热塑牙胶充填根管临床观察

目的：观察连续波热塑牙胶注射法充填根管的临床效果.方法：选择360例根管治疗患者,共380颗牙,其中240颗牙用热塑牙胶注射充填仪做连续波热塑牙胶充填根管,140颗牙用常规冷牙胶侧方加压充填根管,通过X线片比较两组病例的充填质量并比较两组病例间每根管根充需用时间.结果：X线片显示连续波热塑牙胶充填组欠填率1.67％,超填率2.91％,恰填率95.41％,冷牙胶侧压充填组欠填率8.57％,超填率2.85％,恰填率88.57％,比较两组间欠填率与恰填率有统计学差异（P＜0.05）,连续波热塑牙胶充填组平均每根管根充时间8 min.冷牙胶侧压组充填平均每根管根充时间12 min.连续波热塑牙胶充填组缩短根充时间30％.结论：连续波热塑牙胶充填术比冷牙胶侧方加压充填术根管充填质量更高且节约根充时间,提高了工作效率.     

热牙胶注射根管充填法的研究

本文对100个离体牙作了根管充填研究,结果表明,热牙胶注射法与侧压法充填的效果在X线片上无明显差别,但染液渗漏检查和扫描电镜观察,前者的根尖封闭能力和边缘密合度显著优于后者。本文还对热牙胶注射充填的程度与一些因素的关系作了分析与讨论。     

高温注射式热牙胶充填根管时牙根表面温度的变化

目的:评估Obtura Ⅱ热牙胶系统牙胶加热温度在160、180、200 ℃进行根管充填时根管外表面温度的变化是否会对牙周组织造成热损伤,及使用封闭剂对温度变化的影响.方法:42颗离体单根管恒牙根管预备后,用Obtura Ⅱ热牙胶系统以不同温度加热牙胶及是否使用封闭剂分组充填根管.测定根管充填前后根管外表面温度的变化.结果:在3种温度设定下充填时,根管外表面温度的升高值平均都未超过10℃阈值.充填前使用封闭剂对根管外表面温度的升高无论是减少还是增加都未超过1℃,均无统计学意义(P＞0.05).结论:Obtura Ⅱ热牙胶系统在160、180℃的工作温度下进行根管充填时,不会对牙周组织造成热损伤,但200℃的温度设定需谨慎选择;使用封闭剂对抑制根管表面温度的升高无明显影响.     

热牙胶根管充填技术研究进展

热牙胶根管充填技术是目前研究较多、运用较广的根管充填技术，其种类大致包括：热牙胶加压、机械热压、超声震动热压、热塑牙胶注射、固核载体插入等充填技术。本文对这些技术的原理、改良和优缺点作一综述，为临床选用提供参考。     

注射式热塑牙胶充填效果的影响因素

注射式热塑牙胶系统(injectable hermoplasticized utta ercha ystem,ITGP)是根管充填方法中效果较理想的一种，与传统的冷牙胶侧压充填法(lateral condensed gutta percha,LC)相比，具有三维充填密合度高，牙胶均质空隙少，根尖密闭渗漏小，操作方便节省时间等优点，但同时还面临着长度控制困难（尤其是超充)、玷污层去除与否及温度对牙周组织的影响等问题。本文主要就ITGP在充填程度、封闭性及温度等方面所做的研究讲行综述。     

3D-Ultrafil热塑牙胶根管充填的临床应用

根管充填是根管治疗术的重要步骤，消灭死腔，封闭根尖孔，是防止根尖周病变和促进其愈合成功与否的关键因素之一，我科引用3D-Ultrafil热塑牙胶充填系统，开展临床应用，现将其临床充填效果作以总结。     

Condensation of gutta percha after McSpadden

The Authors have studied the efficacy of the sealing effect of thermomechanical compaction of guttapercha according to McSpadden with an in vitro analysis on undecalcified tooth sections and with a clinical evaluation of ten patients with periapical lesions. The analysis of the results has shown a good sealing capacity of the McSpadden technique.     

The immuno cross-reactivity of gutta percha points.

OBJECTIVE: The purpose of this study is to test the postulated immuno cross-reactivity between proteins derived from raw gutta percha (RGP), gutta percha point (GPP) and natural rubber latex (NRL). METHODS: Antigenicity and cross-reactivity of proteins were determined by the FITkit (FITBiotech, Finland) and ELISA inhibition assays. RESULTS: Antigenicity of proteins derived from RGP or GPP was not demonstrated. Except for NRL glove extracts, neither extracts from RGP or GPP were reactive in ELISA inhibition assay. SIGNIFICANCE: There is no immunologic cross-reactivity in vitro between proteins derived from RGP or GPP, and from NRL gloves. Thus, therapeutic use of GPP is unlikely to initiate adverse immuno-reactivity in individuals previously sensitized to NRL proteins.     

An in vitro comparison of three thermal gutta percha systems

Aim The aim of this study was to compare the ability of three contemporary obturation techniques to resist microleakage, using root canals prepared in extracted single rooted teeth by a standardized method. Methodology The shaping technique involved the use of tapered nickel titanium rotary files to create a uniform 0.08‐mm/mm taper. Six groups were compared, two representing control groups, a third group being obturated with a warm vertical condensation technique, a fourth group by an injection thermoplasticized system, a fifth group with a thermomechanical compaction method and a sixth group using cold lateral condensation. A zinc oxide/eugenol sealer was used as the sealant in all the obturation procedures. Forty‐six extracted teeth were used in the study, three teeth in each control group and 10 teeth in each of the remaining four groups. Microleakage was compared using dye leakage with Indian ink. Penetration of the dye at the gutta percha/dentine interface was visualized after the root had been rendered transparent. Dye leakage was then measured from four aspects with the use of a stereomicroscope and export of a digital image to a software package, to facilitate accurate assessment of dye penetration. Two parameters were measured for each sample, the mean dye penetration and maximum dye penetration. Results The mean values for linear dye leakage in the thermomechanical compaction group was 0.53 mm, the warm vertical condensation group was 0.73 mm, the injection thermoplasticized group was 0.15 mm and the cold lateral condensation group was 0.53 mm. There was no statistical difference between the means of the different groups (P > 0.05). The mean of the maximum values for dye leakage in the thermomechanical compaction group was 0.65 mm, the warm vertical condensation group was 1.02 mm, the injection‐thermoplasticized group was 0.28 mm and the cold lateral condensation group was 0.74 mm. There was no statistical difference between the means of the different groups (P > 0.05). Conclusions Within the conditions of this study, there was no statistical difference between the different groups with respect to either mean or maximum dye leakage.