不同冲洗方法清除根管内氢氧化钙的体外研究

目的比较不同冲洗方法对根管内氢氧化钙的清除效果,为临床治疗提供参考。方法收集160颗下颌单根管恒前磨牙,截冠后ProTaper预备至F4。将牙纵向劈为两半,分别在根管壁上制备标准化凹槽和凹陷模型并填入氢氧化钙。根据不同冲洗方法将样本随机分为4组(n=40):注射器组、超声组、XPendo finisher(XPF)组、M3Max组;每组根据冲洗液再分为2个亚组(n=20):次氯酸钠组、次氯酸钠+乙二胺四乙酸(ethylene diamine tetraacetic acid,EDTA)组。冲洗结束后显微镜下拍摄凹槽和凹陷照片,并对残余氢氧化钙进行评分,比较不同冲洗方法和冲洗液对氢氧化钙的清除效果。结果在凹槽和凹陷模型中,使用次氯酸钠作为冲洗液时,超声、XPF和M3Max清除氢氧化钙的效果均优于注射器冲洗(P<0.05);当使用次氯酸钠联合EDTA冲洗时,超声、XPF和M3Max清除氢氧化钙的效果也均优于注射器冲洗(P<0.05);但超声、XPF和M3Max三者之间的差异均无统计学意义(P>0.05);与使用次氯酸钠作为冲洗液时相比,次氯酸钠联用EDTA冲洗可增强超声、XPF和M3Max清除氢氧化钙的效果(P<0.05),但不能增强注射器冲洗效果(P>0.05)。结论次氯酸钠联用EDTA冲洗可增强超声、XPF和M3Max清除氢氧化钙的效果,三者间无明显差异,均优于注射器冲洗。     

应用超声技术和碘仿氢氧化钙糊剂诱导根尖闭合

1　材料与方法1.1　临床资料　选择我科 1998～ 2 0 0 1年临床诊断为牙髓感染、坏死或尖周炎的年轻恒牙 30颗 ,根尖孔均未完全发育完成。患者年龄 9～ 15岁 ,男性 16例共 2 0颗患牙 ,女性 9例共 10颗患牙。其中前牙 18颗 ,第二前磨牙 8颗 ,第一恒磨牙 4颗 ,其病因为外伤 14颗 ,畸形中央尖 8颗 ,龋齿 5颗 ,医源性前牙矫治半脱位 3颗。采用日本森田株式会社制注射型“比塔派克斯”碘仿氢氧化钙根管充填糊剂和美国登士柏公司生产超声根管治疗仪。1.2　治疗方法与步骤1.2 .1　患牙局麻下开髓、拔髓、止血 ,根管内置牙胶尖摄Ｘ线牙片 ,测出根管工…     

不同冲洗方法去除根管内氢氧化钙封药的效果比较

氢氧化钙常被用作根管内封药,但根充前残留在根管内的氢氧化钙可能会削弱根充物的封闭性,进而影响根管治疗的效果.比较针头冲洗、超声冲洗、声波冲洗、根管刷、Endovac系统、RinsEndo系统、自调节根管锉系统和激光活化冲洗法对氢氧化钙封药的去除效果,可为临床选择去除氢氧化钙的冲洗方法提供参考.     

替硝唑氢氧化钙糊剂充填根管的临床疗效观察

目的:探讨替硝唑氢氧化钙糊剂联合牙胶尖充填根管的临床疗效.方法:460例共500个牙,按就诊顺序的单双号随机分成2组.实验组:230例257个牙,根管预备后,以3%双氧水和替硝唑溶液反复冲洗根管,并用替硝唑棉捻消毒根管,将替硝唑氢氧化钙糊剂捣入根管内,置牙胶尖按侧方加压法完成根管充填.对照组:230例243个牙,根管预备后,以3%双氧水和生理盐水冲洗根管,FC棉捻消毒根管,用根管糊剂和牙胶尖按侧方加压法完成根管充填,全部病例经2年以上追踪观察.结果:实验组的临床疗效(96.11%)明显优于对照组(65.02%),两者有统计学差异(P＜0.01).结论:替硝唑氢氧化钙糊剂联合牙胶尖用于根管充填,是一种有效的治疗根尖周病的方法.     

氢氧化钙碘仿糊剂用于乳牙感染根管消毒的疗效观察

目的：观察氢氧化钙碘仿糊剂用于乳牙感染根管消毒的临床疗效。方法：272个患牙随机分成两组,治疗组151个用氢氧化钙碘仿糊剂根管封药,对照组121个用甲醛甲酚根管封药,1周后复查,观察疗效。结果：1周后复查,治疗组临床疗效明显优于对照组。结论：氢氧化钙碘仿糊剂可抑制细菌的生长,诱导根尖周组织矿化修复,有益于保护继承恒牙胚,用于乳牙感染根管消毒疗效好。     

氢氧化钙碘仿糊剂用于乳牙感染根管消毒的疗效观察

目的：观察氢氧化钙碘仿糊剂用于乳牙感染根管消毒的临床疗效。方法：272个患牙随机分成两组,治疗组151个用氢氧化钙碘仿糊剂根管封药,对照组121个用甲醛甲酚根管封药,1周后复查,观察疗效。结果：1周后复查,治疗组临床疗效明显优于对照组。结论：氢氧化钙碘仿糊剂可抑制细菌的生长,诱导根尖周组织矿化修复,有益于保护继承恒牙胚,用于乳牙感染根管消毒疗效好。     

氢氧化钙碘仿糊剂在118例乳牙活髓切断术中应用评价

目的观察氢氧化钙碘仿糊剂用于治疗乳磨牙活髓切断术的疗效.方法作者用两种盖髓剂治疗118名患者的190个乳磨牙活髓切断术,并进行了3年的临床观察.结果单纯用氢氧化钙临床疗效差,用氢氧化钙碘仿糊剂临床疗效好,牙根无吸收或与对侧同名牙牙根吸收同步.结论氢氧化钙碘护糊剂是乳牙活髓切断比较理想的盖髓剂.     

氢氧化钙甘油糊剂对根管壁玷污层的溶解作用研究

目的观察氢氧化钙甘油糊剂对根管壁玷污层的溶解作用。方法30颗离体上前牙随机分为3组。常规预备根管后,A组封入氢氧化钙甘油糊剂,B组封入碘仿糊剂,C组封入樟脑酚。7d后清洗根管壁,并在扫描电镜下观察。结果A组根管壁玷污层明显较少,与B组和C组差异有统计学意义(P<0.01);B组与C组玷污层差异无统计学意义(P>0.05)。结论氢氧化钙甘油糊剂对根管壁玷污层有溶解作用。     

氢氧化钙碘仿糊剂诱导年轻恒牙根尖形成的临床疗效观察

目的：探讨氢氧化钙碘仿糊剂在根尖诱导成形术中的作用。方法：收集2000～2006年在我科行根尖诱导成形术且资料完整的年轻恒牙病例161例,其中牙髓炎83例,根尖周炎78例。均采用氢氧化钙碘仿糊剂进行根尖诱导并定期复诊,随访1～3年,观察临床症状及X线片牙根及根尖的发育情况。结果：氢氧化钙碘仿糊剂在根尖诱导成形术中有效率88.2%,根尖诱导作用明显。结论：氢氧化钙碘仿糊剂对年轻恒牙牙根形成及根尖诱导有良好效果。     

比较不同冲洗液对根管内氢氧化钙的清除效果及根管牙本质显微硬度的影响

目的:比较5种不同根管冲洗液对根管内氢氧化钙(CH)的清除效果及对牙本质显微硬度的影响.方法:在70颗单根管离体牙的根管壁上制备凹沟,10颗牙齿作为阴性对照组不导人CH糊剂,60颗牙齿导入CH糊剂,封药1周.1周后,10颗牙齿作为阳性对照组不去除CH糊剂,其余50颗牙齿根据清除氢氧化钙所使用的冲洗液不同随机分成5组(n...     

The evaluation of removal of calcium hydroxide paste from an artificial standardized groove in the apical root canal using different irrigation methodologies

AIM: To evaluate the capacity to remove a calcium hydroxide (Ca(OH)2) paste from the root canal and to evaluate the efficacy of Ca(OH)2 removal during passive ultrasonic irrigation using either sodium hypochlorite (NaOCl) or water as an irrigant. METHODOLOGY: Sixteen mandibular premolars were used. Each root was prepared to the apical foramen using GT instruments of size 30, 0.06 taper. Each root was split longitudinally. In one half of the root, a groove was cut in the canal wall 2-6 mm from the apex which was then filled with a Ca(OH)2 paste. Subsequently the roots were reassembled. In group 1 (n = 16), the teeth were ultrasonically irrigated using 50 mL 2.0% NaOCl as the irrigant. Group 2 (n = 16) was treated in the same manner as group 1, but using 50 mL water in place of the NaOCl. In group 3 (n = 16), the teeth were irrigated by syringe injection of 50 mL 2.0% NaOCl. The quantity of remaining Ca(OH)2 in the groove was scored and the data analysed with Kruskal-Wallis and Mann-Whitney tests. RESULTS: The difference in remaining Ca(OH)2 between all groups was statistically significant (P < 0.001). Group 1 had significantly lower scores than group 2 (P < 0.001) and group 3 (P = 0.002), but there was no significant difference between groups 2 and 3 (P = 0.765). CONCLUSIONS: Passive ultrasonic irrigation with 2% NaOCl was more effective in removing Ca(OH)2 paste from artificial root canal grooves than syringe delivery of 2% NaOCl or water as irrigant.     

Effect of calcium hydroxide treatment on periodontal repair and root resorption

Abstract Pulpal application of calcium hydroxide is a common treatment for external root resorption. Several mechanisms of action have been suggested. In the present investigation, the effect of pulpal calcium hydroxide on cells at the root surface and in the periodontal ligament was studied by means of scanning-electron microscopy and light microscopy. Lateral incisors in monkeys were extracted, a groove was made- in the root surface and the teeth were then immediately replanted. The pulps of some teeth were infected by bacteria from the saliva. Application of calcium hydroxide in the root canal caused a limited necrosis of the cells resorbing dentin as well as the cells forming reparative cementum in the experimental groove. In the non-infected teeth, a temporary ankylosis developed. The high pH having a bactericidal and necrotizing effect seemed to be sufficient to explain the therapeutic effect of calcium hydroxide on root resorption.     

Effect of different final irrigation agitation techniques on root canal dentin tubule penetration of nanoparticle calcium hydroxide dressing

This study is aimed to assess the efficacy of different final irrigation agitation techniques on dentin tubule penetration of nanoparticle calcium hydroxide (NCH) dressing. Ninety-six extracted upper incisors were shaped up to #40file. Then, Four experimental groups were formed according to the final irrigation procedure: conventional needle irrigation (CNI), manual dynamic agitation (MDA), sonic agitation (SA) and ultrasonic irrigant agitation (UIA). According to the intracanal drug used, these groups were divided into two subgroups: calcium hydroxide (CH) and NCH. Prepared CH preparations were labelled with Rhodamine B, and CH or NCH were placed in root canals. In the UIA group, both CH and NCH had the highest penetration depth and percentage compared to the other groups (p < 0.05). The penetration depth and percentage of NCH in the UIA and SA groups were significantly higher than in the CH groups (p < 0.05). UIA is more effective than other groups in increasing dentinal tubule penetration of CH and NCH.     

Timing of calcium hydroxide therapy in the treatment of root resorption in replanted teeth in dogs

Abstract The effect of time of the onset of calcium hydroxide (CH) pulpectomy on root resorption of 31 permanent dog incisors was investigated. CH pulpectomy was delayed 4, 9, 14 and 18 days after the teeth were extracted and replanted. Control teeth were replanted 1) without pulpectomy, 2) with a pulpectomy only or 31. with a pulpectomy and CH filling. All teeth were prepared for histologic evaluation 8 weeks after the teeth were replanted. Cross section were examined using a computer microscope and linear (jam) and/or square areas (μm²) of surface (SRR), inflammatory (IRR), and replacement (RRR) root resorption were calculated. From this data the percentage of linear and area resorption was averaged for each group. Duncan multiple range t-test (P<0.05) revealed that teeth in which a pulpectomy with CH filling was done extraorally had significantly greater SRR than the rest of the groups; teeth in which a pulpectomy without CH filling was done extra orally had significantly greater RRR than teeth in which CH pulpectomy was delayed for 18 days; there was no significant difference in SRR. IRR or RRR when CH placement was delayed 4, 9, 14 or 18 days after replantation. Although it was not significant the overall resorption was least when CH pulpectomy was delayed 18 days.     

The efficacy of the self-adjusting file and ProTaper for removal of calcium hydroxide from root canals

Objective

The goal of this study was to evaluate the efficacy of the Self-Adjusting File (SAF) and ProTaper for removing calcium hydroxide [Ca(OH)₂] from root canals.

Material and Methods

Thirty-six human mandibular incisors were instrumented with the ProTaper system up to instrument F2 and filled with a Ca(OH)₂-based dressing. After 7 days, specimens were distributed in two groups (n=15) according to the method of Ca(OH)₂ removal. Group I (SAF) was irrigated with 5 mL of NaOCl and SAF was used for 30 seconds under constant irrigation with 5 mL of NaOCl using the Vatea irrigation device, followed by irrigation with 3 mL of EDTA and 5 mL of NaOCl. Group II (ProTaper) was irrigated with 5 mL of NaOCl, the F2 instrument was used for 30 seconds, followed by irrigation with 5 mL of NaOCl, 3 mL of EDTA, and 5 mL of NaOCl. In 3 teeth Ca(OH)₂ was not removed (positive control) and in 3 teeth canals were not filled with Ca(OH)₂ (negative control). Teeth were sectioned and prepared for the scanning electron microscopy. The amounts of residual Ca(OH)₂ were evaluated in the middle and apical thirds using a 5-score system.

Results

None of the techniques completely removed the Ca(OH)₂ dressing. No difference was observed between SAF and ProTaper in removing Ca(OH)₂ in the middle (P=0.11) and the apical (P=0.23) thirds.

Conclusion

The SAF system showed similar efficacy to rotary instrument for removal of Ca(OH)₂ from mandibular incisor root canals.