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1.
以60颗离体上颌第1恒磨牙为研究对象。首先采用传统方法开髓并探查近颊第2根管(MB2)口,未能发现MB2者改良髓腔形态后继续探查,最后在牙科显微镜下采用超声技术对肉眼未能发现bfB2的离体牙进行最终探查和确认。结果传统方法探查MB2发现率为31.7%,改良髓腔形态后发现率增至61.7%,使用牙科显微镜后发现率提高至83.3%。近颊两根管121的间距为(1.42±0.46)mm。认为显微超声技术有助于发现较隐匿的MB2根管口,完善根管治疗。  相似文献   

2.
下颌第二磨牙C形根管系统的研究进展   总被引:1,自引:0,他引:1  
陈保兴  申丽丽 《山东医药》2007,47(26):124-125
C形根管是存在于C形牙根中的根管,其主要特点是根管横断面呈“C”形,常见于下颌第二磨牙。1979年,Cooke等发表了下颌第二磨牙中可能出现C形根管系统的报道,并认为其诊断、清理成形及根管充填均较常规情况困难。近来,关于C形根管系统的研究日益受到重视,现将其研究进展综述如下。  相似文献   

3.
杨婕  卢鹏  杨莹  代成林  李健 《山东医药》2010,50(49):79-80
目的研究上颌第2磨牙的外部形态,为临床提供理论和实验依据。方法收集213颗上颌第2磨牙离体牙,观察牙根形态和数目,利用电显游标卡尺测量牙体外形各项指标,并对根尖孔与根尖顶的位置以及至解剖性根尖的距离进行观察和测量。结果外部形态测量显示上颌第2磨牙3根发生率为50.7%,2根发生率为33.8%;上颌第2磨牙以腭侧牙最长,平均长度为18.58mm;根尖孔位于解剖性根尖顶点的为44.6%,旁侧开口占55.4%,旁侧根尖孔距根尖顶部的平均距离为1mm。结论上颌第2磨牙根尖孔大部分位于根尖旁,且根尖孔至根尖的距离并不相等,不能只凭X线片确定工作长度。  相似文献   

4.
翼腭窝的解剖及应用   总被引:2,自引:0,他引:2  
目的观察翼腭窝区的解剖特点。方法成人尸头10具,沿正中线锯开,手术显微镜下于唇龈沟切开黏膜;凿除上颌窦前、后壁,分离上颌动脉翼腭部及其分支和上颌神经及其分支;从侧方切开颧弓,解剖颞下窝,在翼外肌长短头之间分离上颌动脉主干及其分支,在翼腭窝后上内侧分离上颌神经及其分支;用游标卡尺测量上颌动脉及其分支的长度、外径,观察上颌动脉、腭降动脉及蝶腭动脉的毗邻关系。结果翼腭窝狭小,其内有上颌神经、翼管神经、蝶腭神经节以及上颌动脉等重要结构。结论翼腭窝是一狭窄裂隙,其内结构分为神经层和血管层。  相似文献   

5.
目的寻找经上颌窦入路实施颅内手术的相关解剖标志。方法在成人尸头上采用上颌窦入路实施颅内手术,观察翼腭窝、中颅底的解剖结构及显露情况。结果翼腭窝内容物分为血管层和神经层,神经层位于后内侧,血管层位于前外侧,上颌神经、圆孔、蝶腭孔及翼管前孔是翼腭窝的重要解剖标志。围绕圆孔广泛磨除中颅窝底部,打开蝶窦后可显露眶上裂、眶尖及整个海绵窦。结论上颌窦入路手术的解剖标志是上颌神经、圆孔、蝶腭孔及翼管前孔,通过该入路可以安全显露整个海绵窦、鞍旁、鞍区及鞍下区。  相似文献   

6.
陈宁 《山东医药》2012,52(2):105-106
目的比较三种镍钛锉在磨牙根管治疗术中的应用效果。方法将102例牙髓炎及根尖周炎患者(磨牙120颗)随机分为A、B、C组,均采用冠向下预备根管,分别用ProTaper手用镍钛锉、ProTaper机用镍钛锉及Hero642镍钛锉进行根管塑形,均用热牙胶垂直加压充填法充填根管。结果术后1周内评价疗效,A组效果为优25例、良8例、中5例、差2例,B组分别为31、6、2、1例,C组分别为27、10、2、1例。A组与B组比较,P<0.05;A组与C组比较,P>0.05;B组与C组比较,P<0.05。术后6个月评价疗效,A组治疗成功26例,进步7例,无变化4例,失败3例,总有效率为82.5%;B组分别为32、6、1、1例及95%;C组分别为27、8、3、2例及87.5%。B组与A、C组总有效率比较,P均<0.05;A组与C组总有效率比较,P>0.05。结论与ProTaper手用镍钛锉、Hero642镍钛锉相比,ProTaper机用镍钛锉用于磨牙根管治疗效果更好。  相似文献   

7.
目的:探讨恒上前牙龈下牙折应用牙体牙髓正畸联合修复治疗的效果.方法:选择2018年2月~2019年2月在我科就诊的恒上前牙龈下牙折患者34例,随机分为2组各17例,对照组采用常规修复治疗,观察组采用牙体牙髓正畸联合修复治疗.结果:观察组患者治疗有效率88.23%,显著高于对照组70.59%(P<0.05);观察组并发症...  相似文献   

8.
王兰翠  郑军 《山东医药》2010,50(26):63-63
目前,根管治疗是治疗牙髓病及根尖周病的首选方法,但对磨牙的细小弯曲根管,完善的根管预备及严密的根管充填都有一定难度,且操作时间较长,并发症多。2007年以来,我们采用根管充填联合塑化法治疗磨牙牙髓病及根尖周病共133颗患牙,疗效满意。现报告如下。  相似文献   

9.
目的 评价Dyad Flow自粘接流动树脂应用于儿童恒磨牙窝沟龋预防性树脂充填(PRR)的临床效果。方法 选择2016年6月至2018年6月在广西壮族自治区人民医院口腔科就诊的第一恒磨牙窝沟龋患儿78例(共184颗牙),年龄6~14岁,均以PRR技术备洞。采用随机数字表法将其分为观察组和对照组,观察组39例(95颗牙),采用Dyad Flow自粘接流动树脂进行填充;对照组39例(89颗牙),采用Beautifil Flow Plus F03加强型流动聚合体进行填充。记录两组材料充填操作耗时。在治疗后第6、12、24、36个月进行门诊随访,采用改良版美国公共卫生署(USPHS)评价标准对两组治疗效果进行评价,比较两组填充材料的保留情况。结果 在治疗后第6、12、24、36个月,两组在充填体完整性、表面纹理和继发龋方面比较差异不显著(P>0.05)。在治疗后36个月,对照组边缘着色情况显著优于观察组(P<0.05)。生存分析结果显示,对照组的材料保留情况稍优于观察组,但两组差异无统计学意义(log-rank检验:χ2=3.565,P=0.059)。观察组材...  相似文献   

10.
目的 总结窝沟封闭术联合氟保护漆涂布术在预防7~9岁儿童第一恒磨牙龋病中的应用效果.方法 参加牙齿窝沟封闭项目的青州市小学二年级7~9岁学生共3 632例,随机分为三组:A组1 402例(共4 425牙)实施第一恒磨牙窝沟封闭术及氟保护漆涂布术,B组1 370例(共4 116牙)实施第一恒磨牙窝沟封闭术,C组860例(共3 120牙)的第一恒磨牙未做处理.分别于治疗结束后第1、2、3年时进行随访复查,观察A、B两组儿童第一恒磨牙窝沟封闭剂脱落情况,观察A、B、C组儿童第一恒磨牙龋病发生情况.结果 治疗结束后第1、2、3年时,第一恒磨牙窝沟封闭剂脱落率A组分别为9.74%、14.73%、16.18%,B组分别为11.71%、19.05%、20.89%,二组相比,P均<0.05.治疗结束后第1、2、3年时,第一恒磨牙龋病发病率A组分别为1.40%、2.33%、2.73%,B组分别为1.70%、3.69%、5.22%,C组分别为4.04%、7.60%、16.31%;A、B组与C组相比,P均<0.05;A组与B组相比,P均<0.05.结论 窝沟封闭术可有效降低7~9岁儿童第一恒磨牙龋病的发生率.与单独实施窝沟封闭术相比,窝沟封闭术与氟保护漆涂布术联合应用可减少窝沟封闭剂脱落,并进一步降低儿童第一恒磨牙龋病发病率.  相似文献   

11.
    
Over the last two decades, calcium silicate-based materials have grown in popularity. As root canal sealers, these formulations have been extensively investigated and compared with conventional sealers, such as zinc oxide–eugenol and epoxy resin-based sealers, in in vitro studies that showed their promising properties, especially their biocompatibility, antimicrobial properties, and certain bioactivity. However, the consequence of their higher solubility is a matter of debate and still needs to be clarified, because it may affect their long-term sealing ability. Unlike conventional sealers, those sealers are hydraulic, and their setting is conditioned by the presence of humidity. Current evidence reveals that the properties of calcium silicate-based sealers vary depending on their formulation. To date, only a few short-term investigations addressed the clinical outcome of calcium silicate-based root canal sealers. Their use has been showed to be mainly based on practitioners’ clinical habits rather than manufacturers’ recommendations or available evidence. However, their particular behavior implies modifications of the clinical protocol used for conventional sealers. This narrative review aimed to discuss the properties of calcium silicate-based sealers and their clinical implications, and to propose rational indications for these sealers based on the current knowledge.  相似文献   

12.
目的评价显微镜超声技术治疗老年钙化闭锁根管的作用及效果。方法选取2016年10月至2018年4月在承德市口腔医院口腔内科就诊的老年患者159例(264个钙化根管)作为研究对象,按患者治疗意愿分为实验组95例(152个钙化根管)和对照组64例(112个钙化根管)。实验组在显微镜下结合超声技术疏通根管,对照组仅凭手动C锉结合机用扩孔钻完成钙化根管的探查及疏通,2组患者均镍钛根管预备,热牙胶根充,完成根管治疗。比较2组患者治疗后的钙化根管疏通情况。采用SPSS 23.0软件对数据进行分析,根据数据类型,组间比较采用t检验或χ~2检验。结果实验组钙化闭锁根管成功疏通率86.18%(131/152),对照组钙化根管成功疏通率54.46%(61/112)。与对照组比较,实验组不同牙位及不同钙化根管的疏通率均明显升高,疏通时间显著下降,差异有统计学意义(P0.05)。对照组未疏通的51例患牙经显微镜超声技术治疗后,疏通39例,疏通率达76.5%。结论显微超声技术对老年钙化根管的探查及疏通具有更明显的效果,也大大提高了治疗的成功率。  相似文献   

13.
老年患者牙齿残根、残冠的治疗和修复   总被引:1,自引:0,他引:1  
目的 探讨老年患者牙齿残根、残冠治疗和修复的方法和效果,以提高治疗水平。方法 对68例老年患者202颗牙的残根和47颗牙的残冠拍X线片,了解其残根的长度,残根、残冠的治疗和根尖周状况,进行全面治疗设计,包括完善根管治疗、根面充填、核桩冠以及铸桩修复,或作固定桥基牙。并对修复体的使用及牙周健康状况进行了为期1.5~3年的随访观察。结果 行完善根管治疗,前牙109颗,双尖牙74颗,磨牙26颗,成功率92.3%~94.5%,修复体恢复了功能和美观,没有根面龋。修复治疗的失败率为5.5%~7.7%。核桩冠87颗中1颗根裂,7颗松动2~3度的牙均为活动义齿基牙和独立牙,可能与负担过重和创伤有关。64颗铸桩固定桥中,6颗崩瓷,可能与创伤有关。牙龈炎症主要表现在基牙和独立牙。结论 综合治疗和修复老年患者牙齿的残根、残冠,可以保证牙周健康,并能较好地改善咀嚼功能。  相似文献   

14.
    
This study aimed to compare the density of mineral trioxide aggregate (MTA) as a root canal filling material in the apical 5 mm of artificial root canals. Forty transparent acrylic blocks with 30-degree curved canals were instrumented and allocated into four compaction technique groups (n = 10): Lawaty (hand files); gutta-percha (GP) points; auger (nickel–titanium rotary files in reverse mode); and plugger technique. Filled canals were weighed after setting the MTA to calculate difference in mass. Two postoperative radiographs compared radiopacity by measuring luminance variations at 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm from the root apex. Obturation time was measured using a digital chronometer. The significance level was set to p < 0.05. The plugger group had a lower mass. Relative luminance was significantly higher for the Lawaty group than the plugger group at all examined apical levels. The relative luminance of the auger and GP groups were significantly higher than the plugger group at depths between 0.5 mm and 2 mm. Relative luminance was highest for the Lawaty technique at all depths between 0.5 mm and 4 mm. The Lawaty technique group was associated with increased obturation time compared with pluggers. Compacting MTA in curved canals with the Lawaty technique has the highest mass and radiopacity but requires more time.  相似文献   

15.
    
The success of endodontic treatment relies on both apical and coronal sealing. To achieve a good three-dimensional seal, the removal of the smear layer becomes mandatory. This study aims to assess the difference in debris accumulation and smear layer formation while using automated root canal irrigation and conventional syringe needle irrigation. Single-rooted human mandibular premolar teeth (n = 30) which were indicated for orthodontic extractions were selected. An endodontic access cavity was prepared, and a glide path was created. Based on the irrigation protocol decided upon for the study, the teeth were randomly allocated into three study groups, namely Group 1, where the manual syringe needle irrigation method was adopted; Group 2, in which automated root canal irrigation was undertaken; and Group 3, in which teeth remained un-instrumented as it was considered the Control group. The teeth were decoronated at the cement-enamel junction (CEJ) and were subjected for scanning electron microscopy (SEM) examination. Debris and smear layers were viewed in 1000× magnification and scored. A statistically significant (p < 0.05) lower mean debris and smear layer score (p < 0.05) was observed in both study groups when compared with the control group. However, no significant difference (p > 0.05) in the debris and smear layer was observed between the manual syringe needle irrigation and automated irrigation, although automated irrigation devices can be a potential alternative. The present study concluded that the efficacy of smear layer removal remained the same with both automated irrigation and manual syringe irrigation.  相似文献   

16.
    
The aim was to evaluate the canal straightening and the amount of apically extruded debris associated with five rotary nickel-titanium when preparing curved root canals. A total of 100 root canals in extracted human teeth (angles of curvatures 20°–30°; radii 5.9–13.5 mm) were divided into five groups (n = 20/group). The groups were balanced with respect to the angle and the radius of canal curvature. The root canals were prepared using conventional austenite 55-NiTi alloy instruments F360, F6 SkyTaper (both Komet, Lemgo, Germany), and the heat-treated NiTi Jizai, Silk-Complex and Silk-Standard instruments (all Mani, Tochigi, Japan) to an apical size 25. The amount of extruded debris was assessed with a micro balance. Statistical analysis was performed using Kruskal–Wallis test with Bonferroni correction at a significance level of p < 0.05. During canal preparation, neither instrument fractures nor procedural preparation errors were noticed. Regarding canal straightening, the use of Jizai instruments resulted in the significantly lowest straightening (p < 0.05), while no significant differences were obtained between all other groups (p > 0.05). Regarding the amount of apically extruded debris, no significant differences between all groups were obtained (p > 0.05). Within the limitations of this study, all instruments performed well, and especially the Jizai instruments showed an excellent shaping ability.  相似文献   

17.
    
(1) Background: Apical extrusion of debris is an example of a complication that may arise during root canal treatment, and it has been proven to be an unavoidable occurrence during endodontic treatment by numerous authors. Even though it may not hinder the long-term outcome of treatment, it may lead directly to increased levels of postoperative pain and, therefore, lower levels of patient acceptance and satisfaction. The aim of the study was to assess the weight of apically extruded debris during root canal preparation with instruments that use different movement kinematics (rotary, reciprocating, and adaptive motion); (2) Methods: The study was performed using the Myers and Montgomery model. Sixty human premolar teeth were inserted into preweighed Eppendorf tubes and randomly classified into three groups. After manual glide-path preparation, teeth in each group were instrumented to working length set 1 mm short of the anatomical apex using the standard sequence provided by the manufacturers (for Group 1: ProTaper Next X1 & X2; for Group 2: WaveOne Gold Primary, for Group 3: Twisted Files SM1-SM3). Root canals were irrigated with 1 mL of 0.9% NaCl solution between each file insertion. The tubes with collected debris were stored in an incubator at 70 °C for 5 days in order to evaporate the liquid component. Measurement of the weight of extruded debris was performed by subtracting the preinstrumentation from the postinstrumentation weight of the tubes. The results were analyzed with Kruskal–Wallis ANOVA, with significance level set at 0.05; (3) Results: The weight of extruded debris was 0.337 mg (SD = 0.148) for Group 1, 0.305 mg (SD = 0.201) for Group 2, and 0.348 mg (SD = 0.135) for Group 3. (4) Conclusions: Engine-driven root canal preparation with the use of instruments ProTaper Next, WaveOne Gold and Twisted Files that use different movement kinematics (rotary, reciprocating, and adaptive motion) was associated with apical extrusion of debris to a similar extent.  相似文献   

18.
    
Irrigant solutions are used to promote dentin-growth factors (GF) release for regenerative endodontics. This review aimed to evaluate the reports comparing the release of GFs using different root canal irrigant solutions. Eligible studies compared the in vitro GF release in human teeth after the use of at least two distinct solutions. A search was conducted on Pubmed, Scopus, Web of Science, and Lilacs on 11 August 2021. Risk of bias was assessed using SciRAP. Study characteristics and quantitative data were extracted, and meta-analyses were performed for the mean difference (95% confidence interval) of the release of transforming growth factors Beta 1 (TGF-β1) by EDTA compared to other irrigants. Of sixteen eligible studies, eight were included in quantitative analysis. ELISA assays showed higher TGF-β1 release from 10% EDTA compared to 10% citric acid (p < 0.00001). Immunogold assays showed higher levels of TGF-β1 for 17% EDTA (p < 0.00001) compared to 10% citric acid. GRADE identified a low to very low certainty of evidence. These results point to an increased release of TGF-β1 in dentin treated with EDTA. The high heterogeneity and very low certainty of the evidence demand further studies before EDTA indication as a better irrigant for regenerative endodontics. Registration: CRD42020160871 (PROSPERO).  相似文献   

19.
    
The aim of this study was to assess the microcrack formation of moderately and severely curved root canals following instrumentation with Neoniti rotary files using micro-computed tomography. This in vitro study evaluated 18 extracted sound mandibular molars with two separate mesial canals and foramina in two groups (n = 9) with 5–20° (moderate) and 20–40° (severe) root canal curvature. The number of microcracks in the root canal walls was counted at baseline by micro-CT. Subsequently, the root canals were instrumented with 0.20/0.06 v Neoniti files as single files with a torque of 1.5 Ncm and a speed of 400 rpm. The number of microcracks was counted again postoperatively on micro-CT images using Amira software. Statistical analysis was performed using the Shapiro–Wilk test, Levene’s test and repeated-measures ANOVA (α = 0.05). The mean number of microcracks significantly increased postoperatively in both the moderately curved (11.59 ± 9.74 vs. 8.2 ± 7.4; p = 0.001) and the severely curved (13.23 ± 5.64 vs. 7.20 ± 5.94; p < 0.001) groups. However, the differences between the two groups were not significant (p = 0.668). Based on the results obtained, it can be stated that the instrumentation of moderately and severely curved root canals with Neoniti rotary files increases the number of microcracks. However, the higher degree of curvature does not necessarily translate to a higher number of microcracks after root canal instrumentation with this specific rotary system and methodological procedures.  相似文献   

20.
    
Instrument separation during root canal therapy is inevitable in endodontics with several unfavorable clinical consequences. Therefore, examining the cyclic flexural fatigue resistance of commonly used rotary endodontic files is crucial. This study aimed to determine the cyclic flexural fatigue resistance of four nickel–titanium (NiTi) rotary files used as a single canal preparation technique: WaveOne, Reciproc, Protaper F2, and Unicone medium instruments. According to the manufacturer’s instructions, each file was rotated freely within a 1.3 mm deep and 1.3 mm wide V-shaped groove in a stainless-steel block with a 40° and 5 mm radius of curvature. Cyclic fatigue resistance was compared between the NiTi files by verifying the time needed to crack. The data were analyzed using one-way analysis of variance (ANOVA) followed by Scheffé post hoc with a significant level set at p < 0.05. Our results demonstrated that the WaveOne instrument had the highest cyclic flexural fatigue resistance among the tested groups (p ≤ 0.05), while Unicone had the lowest cyclic flexural fatigue resistance. This study concluded that WaveOne size 25/0.08 could illustrate a superior cyclic flexural fatigue resistance when instrumenting root canals with the lowest possibility to cause instrument separation.  相似文献   

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