共查询到20条相似文献,搜索用时 109 毫秒
1.
不同封闭剂对根管壁抗折力的影响 总被引:1,自引:0,他引:1
目的:比较经过完善预备后的根管选用不同封闭剂根充对管壁抗折力的影响。方法:将30颗人尖牙随机分为二个实验组和一个对照组,每组10颗。从牙颈部截去牙冠后进行根管预备。组1以Ultra为封闭剂;组2以Endofil为封闭剂,均采用冷侧压方法充填。组3根管预备后不充填。所有标本进行抗剪切强度试验。结果:组3与其它二组间有显著性差异(P<0.01),抗折应力值最低(126.1819MPa);组1和组2之间有显著性差异(P<0.01),其抗折应力值最大(153.4974MPa)。结论:预备后不充填的根管抗折力,明显低于完善根管治疗组;使用Ultra封闭剂根充后的管壁抗折力,明显强于Endofil组。 相似文献
2.
3.
目的探讨几种根管预备方法和充填技术组合对根尖微渗漏和牙根抗折强度的影响。方法选取离体牙186颗,随机分为6个实验组(A、B、C、D、E、F,每组各30颗牙)和阳性、阴性对照组(G、H,每组3颗牙)。A、B、C组采用逐步深入法进行根管预备,D、E、F组采用逐步后退法。其后,A、D组使用Bee FillTM2in1热牙胶充填系统进行根管充填,B、E组给予Cortisomol糊剂配合热牙胶以垂直加压法,C、F组予以Cortisomol糊剂配合冷牙胶以侧方加压法,G、H组均不做任何充填。采用染料渗透法检测各组离体牙根尖微渗漏情况,对各组离体牙进行纵向抗折强度力学测试。结果相同充填方法下多个预备方法比较,A、B、C组染料渗透长度分别小于D、E、F组(P<0.05),A、B、C组最大抗压负荷分别大于D、E、F组(P<0.05)。相同预备方法下,A组染料渗透长度小于B、C组(P<0.05),D组染料渗透长度小于E、F组(P<0.05);A、B、C组最大抗压负荷依次降低(P<0.05),D、E、F组最大抗压负荷依次降低(P<0.05)。G、H组间最大抗压负荷比较,差异无统计学意义(P>0.05)。结论使用逐步深入法进行根管预备,并联合Bee FillTM2in1热牙胶充填系统应用于根管治疗能够显著减少根尖微渗漏,并提高牙根抗折强度,对根管预备和充填技术的选择具有一定的借鉴意义。 相似文献
4.
张晶 《国际口腔医学杂志》2012,39(4):501-505
根折是根管治疗后常见并发症。很多研究已经显示过度的根管预备,充填时对根管壁产生的应力以及治疗过程中用到的药物、试剂都会直接或间接引起牙根纵折。为了更合理地选择治疗方案,减少医源性的因素导致的根折,本文就根管治疗过程中可能增加根折易感性的因素作一综述。 相似文献
5.
弯曲根管不同预备方法对其根管充填密封性的影响 总被引:2,自引:0,他引:2
目的 研究临床常用预备方法预备弯曲根管对其根管充填密封性的影响.方法 选取不同弯曲程度的离体单根管牙齿90颗,分别使用不锈钢K锉,机用ProTaper,Hero642进行根管预备.AH-PLUS根充糊剂加牙胶尖冷侧压法充填,染料浸泡,分光光度法定量分析微渗漏.结果 不锈钢K锉组预备出的根管,充填后根尖孔微渗量最大,显著大于其余两种镍钛器械预备出的根管(P<0.05).不同根管弯曲程度对根管充填后根尖孔产生微渗漏的影响程度不同,随着根管弯曲程度增加,发生根尖孔染料微渗量增加(P<0.05);不锈钢K锉预备的Ⅲ°弯曲根管充填后出现的根管微渗量最大.结论 当使用冷侧压法充填根管,镍钛器械预备的根管相比不锈钢预备的根管更有利于根管充填后根尖孔的密封,尤其对于弯曲根管. 相似文献
6.
目的 比较根管重塑后纤维桩核系统及传统铸造桩核修复薄弱根管前磨牙的疲劳抗折性能.方法 将16颗实验牙截冠后制备成薄弱根管,随机分为2组,A组根管重塑+预成纤维桩+树脂核修复;B组传统铸造桩核修复.所有样本全冠修复并进行5000次冷热水循环及30万次循环加载,再以3mm/min的速度静加载至折裂发生,记录2组试件折裂发生时的加载强度、折裂模式.结果 抗折载荷分别为A组1.79±0.26KN和B组2.35±0.22KN,差异有统计学意义.A组多见可再修复性折裂,B组多见破坏性折裂.结论 在本实验条件下,根管重塑后纤维桩核系统修复薄弱根管的疲劳抗折强度不及传统铸造桩核修复,但其折裂模式更有利于牙根的保护. 相似文献
7.
不同根管预备法对根管壁清洁度影响的扫描电镜观察 总被引:2,自引:1,他引:1
目的 比较常规根管预备法、回旋手机根管预备法、超声根管预备法和Profile根管预备法的根管壁清洁度,以提高根管治疗的效果.方法 选用40颗单根管离体牙,随机分成常规组、回旋手机组、超声扩大组和Profile组,分别进行根管预备后纵劈根管,用扫描电镜观察根管壁的清洁度,并进行比较.结果 经Kruskal-Wallis秩和检验,超声组和Profile组比较(P<0.05)差异有显著性;Profile组和常规组、回旋组比较(P<0.05)差异有显著性;常规组和回旋组比较(P>0.05)差异无显著性.结论 超声组的根管壁清洁度优于Profile组,Profile组根管壁洁度优于回旋组和常规组,回旋组和常规组的根管壁清洁度相似. 相似文献
8.
目的:评价不同根管充填系统对牙根抗折性能的影响.方法:计算机检索数据库中关于不同根管充填系统对牙根抗折性能影响的随机对照实验,检索时限从建库至2021年1月,采用ADDIS 1.16.6和Stata 15.1软件进行网状分析.结果:共纳入26篇文献,包含1330颗离体牙.网状Meta分析结果显示:与阳性对照组比较,侧方... 相似文献
9.
根管偏移对充填材料封闭根管能力的影响 总被引:26,自引:1,他引:25
目的:研究弯曲根管预备后的根管偏移对充填材料封闭根管能力的影响。方法:选取73颗下颌单根管前磨牙作为研究对象,其中弯根管牙46颗,直根管牙27颗,A组23颗弯根管牙用Lightspeed器械预备根管,B组23颗弯根管牙,C组17颗直根管牙以及对照组牙用K锉预备根管,预备方法为逐步后退技术,使用双曝光X线技术和Ehrlich法测量根管偏移指数(AT1)的大小,使用侧向加压技术充填所有根管后,用流体传输模型测量每个根管内微渗漏的量,结果:A组中有19%的根管发生根管偏移,B组中有85%的根管发生根管偏移,两组之间AI1的大小有高度显著性差异,当ATI大于0.3nm,时,根管内微渗漏的发生率明显增加,结论:弯曲根管顶备中出现的根管偏移会削弱充填材料封闭根管的效果。 相似文献
10.
11.
Weishi Yan Carolina Montoya Marit Øilo Alex Ossa Avina Paranjpe Hai Zhang Dwayne D. Arola 《Journal of endodontics》2019,45(2):189-193
Introduction
Although the strength and toughness of dentin decrease with age, no study has explored if restorative treatments are a contributing factor.Methods
Multiple extracted teeth were obtained from randomly selected donors and categorized according to donor age and prior root canal treatment. The microstructure and chemical composition of radicular dentin were evaluated using scanning electron microscopy and Raman spectroscopy, respectively, and the strength was evaluated in 4-point flexure to failure. Data were compared using the Student t test.Results
Dentin from the root canal–restored teeth exhibited significantly lower strength (P < .05) than tissue from age- and donor-matched unrestored tooth pairs. Although there was no significant difference in the mineral-to-collagen ratio between the 2 groups, dentin obtained from the root canal–treated teeth exhibited more extensive collagen cross-linking and lower tubule occlusion ratios than the unrestored tooth pairs.Conclusions
There is a decrease in the strength of radicular dentin with aging, but prior root canal treatment increases the extent of degradation. 相似文献12.
根管治疗术是牙髓病和根尖周病常见的治疗方法,术后严密封闭根管系统可以切断根尖周组织再感染途径,确保根管治疗的远期疗效。如果根管封闭性欠佳则容易引起病原微生物及其代谢产物经过封闭材料与根管壁之间的微渗漏(包括冠方和根尖区)使根尖周组织再感染导致根管治疗失败。可见严密封闭根管系统至关重要。目前检测根管封闭性的方法较多,但关于根管系统封闭性的影响因素和检测根管封闭性的方法尚缺乏较系统的阐述。本文将影响根管封闭性的因素及检测和评价根管封闭性的方法进行综述,为检测根管充填质量和评估远期疗效提供借鉴和参考。 相似文献
13.
超声根管预备和根管封闭剂对根尖微渗漏的影响 总被引:1,自引:0,他引:1
目的 了解超声根管预备和根管封闭剂对根管治疗后根尖微渗漏的影响。方法 将79颗离体牙随机分为5个实验组和2个对照组。实验组分别用超声波,回旋手机和手法备根后分别用AH plus^TM,根充I号,氧化锌糊剂作根管封闭剂并用牙胶法作侧压充填。用2%亚甲蓝浸泡1周后纵剖牙体,体视镜下观测染料渗透长度。数据行统计学分析。结果 三种备根方法中,超声备根组根尖微渗漏最少。三种根管封闭剂中,AH plus^TM组微渗漏最少。结论 超声根管预备后根充术,同时采用AH plus^TM根管封闭剂,能有效地减少根充术后微渗漏,提高根管治疗效果。 相似文献
14.
VP糊剂根管充填或空管疗法治疗乳磨牙尖周脓肿的疗效比较 总被引:1,自引:0,他引:1
目的 对患尖周脓肿的乳磨牙采用VP糊剂进行根管充填或空管疗法的疗效观察。方法 将182例190颗患牙随机分为VP糊剂根管充填组和空管疗法组,1年后回访。结果 根管充填组治疗有效率为93.75%,空管疗法组为91.49%,经卡方检验两者疗效无显著性差异(x~2=0.38,P>0.05)。结论 空管疗法疗效好,操作简便,临床应用前景广阔。 相似文献
15.
目的:评价3种根管封闭剂的根尖和冠方封闭性能.方法:收集新鲜拔除的人恒前牙60颗,用手用镍钛锉预备后随机分为A、B、C 3个实验组即为Cortisomol封闭剂、AHplus封闭剂加牙胶尖侧压充填,GattaFlow加主尖充填(每组20颗).根充后用印度墨汁染色、脱矿、脱水、制成透明,在体视显微镜下测量染料渗入根管的长... 相似文献
16.
有瘘型根尖周炎的氩离子激光手术及一次程根管充填的临床疗效观察 总被引:2,自引:0,他引:2
目的 :探讨 Ar+激光手术加一次程根管充填治疗有瘘型根尖周炎的处理方法及疗效 ,为临床提供一种新的根管消毒法 .方法 :应用 Ar激光技术及一次程根管充填术对 87例有瘘型根尖周炎患牙进行治疗和临床观察分析 .结果 :成功 70例 ,进步 9例 ,总有效率达 90 .8% .结论 :证实了 Ar+激光临床根管治疗的有效性、安全性和实用性 ,不失为一种新的临床根管消毒方法 ,在临床具有应用前景。 相似文献
17.
《Journal of endodontics》2019,45(5):628-633
IntroductionThe aim of this study was to compare the fracture resistance of upper premolars undergoing root canal treatment that had been temporarily restored with 4 different temporary filling materials.MethodsThis study was based on 120 extracted upper premolars. Eight teeth were left intact and served as the negative control group. Mesio-occluso-distal cavities with 2 different designs were prepared for the rest of the teeth (for group 1 a width of one third of the intercuspal distance and for group 2 a width of two thirds of the intercuspal distance). Then, the endodontic access cavities were prepared, and the root canals instrumented with Revo-S rotary files (MicroMega, Besancon, France). Thereafter, a total of 16 teeth consisting of 8 each from group 1 and group 2 served as the positive control group and did not have any temporary filling material. The teeth were randomly divided into 4 subgroups (n = 12) according to the temporary filling material: Cavit G (3M ESPE, St Paul, MN), Coltosol F (Coltène/Whaledent AG, Altstätten, Switzerland), Intermediate Restorative Material (Dentsply Sirona, Konstanz, Germany), or DiaTemp (DiaDent Europe BV, Almere, Netherlands). Each specimen was then subjected to a fracture resistance test using a universal testing machine until the fracture occurred. The force required to fracture each specimen was recorded, and the data were statistically analyzed.ResultsThe negative control group showed the highest fracture resistance values compared with the other groups, whereas the positive control groups showed the lowest fracture resistance values. There were no statistically significant differences in the fracture resistance of upper premolar teeth undergoing root canal treatment among Cavit G, Intermediate Restorative Material, Coltosol F, and DiaTemp, regardless of the cavity width (P > .05).ConclusionsThe cavity design was found to be an effective factor on the fracture resistance of upper premolar teeth undergoing root canal treatment. The temporary filling materials tested did not affect the fracture resistance. 相似文献
18.
CORTISOMOL根管糊剂即时充填感染根管的临床观察 总被引:16,自引:0,他引:16
目的观察Cortisomol根管糊剂即时治疗感染根管伴急性根尖周炎的疗效。方法 门诊就诊的165例随机分为实验组(Cortisomol组)82例、91个牙和对照组(常规组)83例、87个牙。常规根管预备后,Cortiso-mol组即时行根管充填;对照组二次法常规根管充填。结果 实验组治疗后94.5%患牙3天内完全止痛,近期治愈率显著高于对照组(P<0.05)。结论 Cortisomol是一种理想的治疗感染根管的根管充填剂。 相似文献
19.
20.
《Journal of endodontics》2021,47(9):1467-1471
IntroductionThe aim of the present study was to investigate the influence of root canal preparation size and taper of middle mesial (MM) canals on fracture resistance of mandibular molars.MethodsFifty-five mandibular molar teeth having an MM canal were selected based on the cone-beam computed tomographic analysis. After the decoronation and distal root separation procedure, the lengths of the mesial roots were standardized to 13 mm. The specimens were randomly distributed into 5 groups (n = 11). Mesiobuccal and mesiolingual canals were prepared up to size 30.06 using VDW.ROTATE rotary files (VDW, Munich, Germany). The MM canal was prepared up to size 25.04, 25.06, 30.04, and 30.06, respectively. No preparation was done in the MM canal in the control group. After the irrigation protocol, the canals were obturated with the single-cone technique. A thin layer of silicone-coated specimens was embedded in acrylic resin and subjected to a fracture strength test by a universal testing machine. A vertical force was applied to the roots until they fracture. Statistical analysis was performed with 1-way analysis of variance and post hoc Duncan tests (P = .05).ResultsThere was no significant difference between group 25.04 and the control group, but the fracture strengths of these groups were found to be significantly higher than that of groups 25.06, 30.04, and 30.06 (P < .05).ConclusionsWithin the limitations of this study, we concluded that increasing the apical diameter and taper in the MM canal reduces the fracture strength of mandibular molar teeth. Among the tested instrumentation sizes, fracture strength decreased significantly when greater than 25.04 instrumentation sizes were chosen. 相似文献