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1.
老年人下颌磨牙牙根及根管的锥形束CT研究   总被引:3,自引:1,他引:2  
目的:利用锥形束CT观察分析老年人下颌磨牙的牙根、根管数目和形态。方法:选择能够配合检查,并在扫描过程中头部保持静止状况的老年人,对其牙齿进行锥形束CT扫描,对扫描图像进行三维重建和选择不同方向的断层观察记录下颌磨牙的牙根和根管。结果:锤形束CT检查老年人166例,下颌磨牙共532颗。下颌磨牙近中根均为单根,远中双根仅发生于下颌第一磨牙,而C形根则仅发生于第二磨牙。近中根以两根管为主在下颌第一磨牙和第二磨牙分别占有95.26%和50.38%;远中根以一根管为主在第一磨牙和第二磨牙分别占有64.60%和56.97%,C形根管的发生率为22.48%。结论:下颌磨牙牙根和根管的变化主要发生在第一磨牙的远中根和第二磨牙的C形根及C形根管。  相似文献   

2.
《Journal of endodontics》2020,46(9):1241-1247
IntroductionMandibular premolars usually have one root and one root canal. Different studies found that up to 30% of mandibular premolars have more than one root canal, and up to 24% of mandibular premolars have C-shape canals. The purpose of this study was to investigate the root anatomy and the prevalence of complex root canal morphology in mandibular premolars in Israeli population.MethodsA total of 1020 Israeli patients' cone-beam computed tomography scans were screened and evaluated. A total of 1835 mandibular first premolars and 1678 mandibular second premolars were examined. Irregular root anatomy and different root canal morphologies were recorded and analyzed.ResultsThe overall prevalence of complex root morphology (types II–VIII) in mandibular first and second premolars was 21% and 2.8%, respectively. The bilateral prevalence of complex root morphology in mandibular first and second premolars was 46% and 29%, respectively. The prevalence of radicular grooves in mandibular first and second premolars with complex root morphology was 48% and 36%, respectively. No significant difference was found according to gender or the side of occurrence. However, complex root canal morphology was significantly found in mandibular premolars with radicular grooves.ConclusionsComplex root canal morphology frequently occurs in mandibular first premolars in the population of Israel. Radicular groove existence in mandibular first and second premolars is significantly related to complex root canal morphology.  相似文献   

3.
下颌前牙多为单根单管,但有资料表明下颌切牙的根管解剖形态可有较大的变异,因此在根管治疗中应高度重视,以免造成根管遗漏.作者就母女二位患者的下颌前牙均为对称型双根管做一报道.  相似文献   

4.
目的:探索成人下颌第二磨牙根形态、根管形态及两者的相关性。方法:将96颗成人下颌第二磨牙用透明法显示其根管空间形态,在解剖显微镜下观察根管数目、形态与该牙根形之间的相关关系。结果:该牙的根形最常见为双根和融合根,融合根形达42%且其根管有4种分型,双根形的近中根31%为双根管。结论:下颌第二磨牙的根管形态较复杂,根之外形与根管形态、数目间有关联。  相似文献   

5.
The presence of three root canals in the mandibular premolar may sometimes be recognized when there is persistent postoperative discomfort following root canal therapy. This paper presents two cases of root canal treatment of mandibular premolars with three root canals including one mandibular first premolar and one mandibular second premolar. The possibility that there is more than one root canal in lower premolar teeth must be considered in the radiographic and clinical examination during root canal treatment.  相似文献   

6.
离体下颌前磨牙根管及牙根形态研究   总被引:4,自引:0,他引:4  
目的 :研究离体下颌前磨牙的牙根及根管形态。方法 :观察并记录 69个离体下颌第一前磨牙及 93个下颌第二前磨牙牙根的基本形态 ,对牙齿进行近远中向X线摄片 ,当X线片上显示疑问根管时 ,分别从根中 1/3 ,根尖 1/ 3横断 ,确定根管的类型 ,按Vertucci’s分类法对根管系统进行记录。结果 :所收集的下颌前磨牙均为单根 ,其中大多数下颌第一前磨牙的根管类型是I型 ( 1) ,93个下颌第二前磨牙的根管均为I型 ( 1) ,下颌第一前磨牙的根面沟发生率较高 ( 15 / 69) ,且此类型的下颌第一前磨牙常有双根管 ,主要是V型 ( 1-2 ) ,下颌第二前磨牙的根面沟发生率相对较低 ( 5 / 93 )。结论 :当X线片上显示下颌第一前磨牙的异常影像时 ,应进行详细的X线检查和髓腔探查 ,避免误判或治疗时遗漏根管。  相似文献   

7.

Introduction

Central and lateral mandibular incisors usually have 1 root canal. The purpose of this study was to investigate the prevalence of additional root canals in central and lateral mandibular incisors and to investigate the prevalence of oval and long oval canals in the cervical, middle, and apical thirds of cases with 1 root canal.

Methods

A total of 1016 Israeli patients' cone-beam computed tomography scans were screened and evaluated. A total of 1472 central mandibular incisors and 1508 lateral mandibular incisors were examined. The root canal morphology and cross-sectional shape were recorded and analyzed.

Results

The overall prevalence of more than 1 root canal in mandibular central and mandibular lateral respectively was 40.5% and 37.9%. The bilateral incidence of more than 1 root canal in mandibular central and mandibular lateral respectively was 69.8% and 68.7%. The root canal separation in type II to type V central and lateral mandibular incisors was found in the middle third of the root in 81.5% and 79.0%, respectively. The septum was smaller than 1 mm in 37% of central mandibular incisors and one-third of lateral mandibular incisors. In central and lateral incisors with 1 root canal, long oval canals were found in the middle third of the root of central and lateral mandibular incisors in 36.8% and 48.9%, respectively.

Conclusion

The occurrence of more than 1 root canal in central and lateral mandibular incisors is approximately 40% (type III was the predominant canal type). In central and lateral incisors with 1 root canal, long oval canals are common.  相似文献   

8.
目的:采用锥形束CT探讨新疆维吾尔族成人双侧下颌第一前磨牙根管的解剖形态。方法:选100例双侧下颌第一前磨牙的CBCT扫描数据,分析其根管数目及形态、双侧根管对称性、两根管口间的距离和多根管分叉位置,以Vertucci根管分型为标准对根管形态进行分型。结果:下颌第一前磨牙不同根管类型发生率分别为Ⅰ型76.5%,Ⅳ型8.5%,Ⅱ型6%,Ⅴ型4%,Ⅲ型3.5%,C形1.5%;两根管口间距离集中在1~3 mm,根管双侧对称性为85%。下颌第一前磨牙多根管发生率与性别有相关性(P=0.02),而左、右两侧下颌第一前磨牙多根管发生率无差异。结论:下颌第一前磨牙根管解剖结构复杂,多根管发生率超过20%,CBCT可为根管系统提供准确依据。  相似文献   

9.
目的:探索下颌第一前磨牙根管形态分布规律。方法:收集形态完整的下颌第一前磨牙105个,先将根外形分类,再使用透明法显示根管系统形貌,经统计学处理探索其根管形态分布规律。结果:①下颌第一前磨牙的根外形有"单一形"和"异根形"两类,其中异根形占24.8%、单根形占66.7%;②根管类型按Vertucci分类有8型之多,异形根的根管通常复杂,约占92.3%。结论:下颌第一前磨牙根外形和根管形态并非形貌单一,故在临床根管治疗操作中应谨慎。  相似文献   

10.
下颌第一磨牙远舌根的研究进展   总被引:1,自引:0,他引:1  
远舌根是位于下颌恒磨牙远中舌侧的一个部分或完全独立的额外牙根,常见于下颌第一磨牙。远舌根通常细短弯曲,它的出现增大了下颌第一磨牙根管治疗的难度。充分认识和识别远舌根,对于提高下颌第一磨牙根管治疗的成功率有重要意义。近年来,随着大家对下颌第一磨牙解剖的认识日益重视,对远舌根的研究日趋深入。下面就国内外学者对于远舌根的解剖研究作一回顾。  相似文献   

11.
A ten-year-old girl broke the central cusps of the mandibular second premolars. The mandibular right second premolar was treated with apexification and the left with apexogenesis. These methods were chosen in view of the presented clinical symptoms, radiographic findings, and outcome of bacterial cultures of root canal samples. At postoperative 2 years 8 months, disappearance of the focus, closure of the root canal, and formation of the root apex were observed in both mandibular premolars. The mandibular left second premolar demonstrated a nearly normal root formation and root apex morphology. Immediately beneath the extracted pulp, regular, uniform, and thick hard tissue was formed. Meanwhile, in the mandibular right second premolar, root growth was suspended, making the root short, and the contour was constructed in such a way that it encircled the distal apical area from the mesial side forming the root apex.  相似文献   

12.
下颌第一恒磨牙因萌出早,处在左右侧颌骨的中份,所承担的咀嚼功能最大,发生疾病和失牙的概率高.为分析成人下颌第一磨牙拔除原因,进一步了解牙齿外形和根管解剖形态,提高下颌第一磨牙牙周病、牙髓病和根尖周病治疗的成功率,收集成人离体下颌第一磨牙100 颗,分析拔除原因;体视显微镜下观察、测量根长及不同部位根管数目和形状,为临床治疗下颌第一磨牙积累资料.  相似文献   

13.
目的: 通过锥体束CT(cone-beam computed tomogphy,CBCT)成像系统对新疆维吾尔族成人下颌第二磨牙C形根管的发生率及其形态特征进行研究。方法: 选择来我院体检且下颌牙列完整的100名维吾尔族成人,进行CBCT扫描,观察下颌第二磨牙的根管形态。结果: C形根管的发生率为15.0%,C 形根管类型变化多样。结论: C形根管在下颌第二磨牙有较高的发生率,且解剖形态存在较大差异。CBCT在C形根管的诊断方面具有重要作用,可以为维吾尔族成人下颌第二磨牙C形根管的临床诊疗提供依据。  相似文献   

14.
目的探讨磨牙区拥挤与下颌智齿牙根发育形态之间的关系。方法选择下颌第三磨牙牙根发育完成的22-35岁成年正畸患者的曲面断层片1056张,观察下颌第一、第二及第三磨牙牙根分叉和聚拢的分布情况,探讨下颌第三磨牙阻生与完全萌出与其牙根聚拢程度的关系。结果从下颌第一磨牙至第三磨牙,牙根聚拢程度有增加的趋势。下颌第三磨牙阻生与否对于牙根的分开与聚拢没有显著影响。结论下颌第三磨牙牙根形态变异较大,牙根的分开与聚拢与末端磨牙区拥挤与否无明显关联。  相似文献   

15.
目的利用锥形束CT(CBCT)分析云南地区人群下颌第一前磨牙、第二前磨牙和第一恒磨牙根管解剖形态,为临床根管治疗提供理论依据和参考。 方法根据年龄(20 ~ 29岁、30 ~ 39岁、40 ~ 49岁、50 ~ 59岁)分层抽取2017年1月至2018年1月在昆明医科大学附属口腔医院放射科进行CBCT检查的患者的数据资料各100例。400例患者中有324例CBCT数据资料符合标准,其中男166例、女158例,年龄20 ~ 29岁82例、30 ~ 39岁82例、40 ~ 49岁82例、50 ~ 59岁78例。统计分析下颌第一前磨牙、第二前磨牙和第一恒磨牙的根管数目、根管长度和根管弯曲度,并对不同年龄段根管长度、下颌第一磨牙牙尖到根分叉距离及根尖孔到下颌神经管距离数据进行单因素方差分析,对不同性别下颌第一磨牙牙尖到根分叉距离及根尖孔到下颌神经管距离数据进行独立样本t检验。 结果通过对324例患者CBCT影像资料的分析得出,下颌前磨牙基本为单根管(647/648颗),仅见1例右下第一前磨牙双根管。下颌前磨牙弯曲度以一级弯曲(5° ~ 10°)和二级弯曲(10° ~ 25°)为主,前磨牙根管长度大多处于正常范围(15 ~ 25 mm),下颌第一恒磨牙弯曲度近远中根均以二级弯曲(10° ~ 25°)为主,下颌第一恒磨牙牙尖到根分叉的距离随年龄增长变短(F左侧=11.16,P左侧<0.001;F右侧=11.51,P右侧<0.001),男女性别差异无统计学意义(t左侧=1.31,P左侧=0.19;t右侧=0.51,P右侧=0.61);下颌第一恒磨牙根尖孔到下颌神经管的距离随年龄增长变长(F左侧=7.03,P左侧<0.001;F右侧=12.25,P右侧<0.001),男女性别差异无统计学意义(t左侧=-0.64,P左侧=0.52;t右侧=-0.11,P右侧=0.91)。 结论本研究中云南地区人群下颌前磨牙根管解剖形态相对简单;下颌第一恒磨牙根管解剖形态复杂,云南地区人群下颌前磨牙、第一恒磨牙根管解剖系统与其他地区相比有所差异,但增龄性变化无区别,CBCT可为临床根管治疗提供依据。  相似文献   

16.
The importance of an accurate diagnosis of the morphology of the root canal system is a prerequisite for successful root canal treatment and has been emphasized throughout the literature. Root canal morphology of premolar teeth, either maxillary or mandibular, and the discrepancies between first and second premolars, have been investigated and reported. A case report is presented of the root canal treatment of a mandibular second premolar with four root canals. As far as the reviewed literature revealed, up to three root canals in mandibular premolars have been reported. No previous report of a similar case of four root canals in a mandibular premolar was found.  相似文献   

17.
下颌尖牙一般为单根单管,作者碰到1 例双根双根管型下颌尖牙.据观察,该牙颊、舌侧根的大小基本一致.测量其颊、舌侧根的长度,分别为24.5、 23.0 mm.想要成功施行牙髓病治疗,临床医师应意识到下颌尖牙解剖变异的可能.  相似文献   

18.
目的调查下颌第一恒磨牙远舌根的发生率及根管治疗情况。方法临床收集378颗下颌第一恒磨牙根管治疗的完整病例,包括病历记录和术前、术中、术后X线片,记录下颌第一恒磨牙的牙根数目、根管数目及根管治疗情况。结果在378颗下颌第一恒磨牙中,远舌根的发生率为26.98%(102/378),男、女患者和左、右侧远舌根的发生率均无统计学差异(P>0.05)。在根管治疗中,远舌根根管器械分离、侧穿和欠填的发生率高于其他根管(P<0.05)。结论远舌根在下颌第一恒磨牙中的发生率较高,发生器械分离、根管侧穿以及欠填的比例也高于其他根管。  相似文献   

19.
下颌第一前磨牙的临床根管漏治   总被引:2,自引:0,他引:2  
目的:提高临床医生对下颌第一前磨牙存在双根管的认识。方法:报道4例典型的下颌第一前磨牙根管漏治的病例,结合69个离体的下颌第一前磨牙的根管类型研究。结果:由于临床医生的疏忽和下颌第一前磨牙自身解剖特点,易发生下颌第一前磨牙根管漏治。结论:下颌第一前磨牙根管漏治是根管治疗术失败原因之一。  相似文献   

20.
目的 评价不同剂型EDTA对弯曲根管作用的疗效.方法 选择2010年7-12月在中国医科大学口腔医学院综合急诊科就诊的480例急性牙髓炎患者的480颗后牙,包括具有轻度弯曲(simple,S),中度弯曲(medium,M),重度弯曲(difficult,D)3种弯曲根管的上、下颌前磨牙及上、下颌磨牙各40颗,每颗患牙选取1个根管作为研究对象,并将其随机分为试验组和对照组,分别采用凝胶型EDTA和液体EDTA作为根管润滑剂,1%NaClO作为冲洗剂,结合ProTaper冠向深入法预备根管,观察各组根管预备时间以及根管预备后疼痛反应.结果 (1)根管预备时间:上颌前磨牙、磨牙的M、D弯曲根管和下颌前磨牙、磨牙的S弯曲根管试验组和对照组差异有统计学意义(P<0.05);上颌前磨牙、磨牙的S弯曲根管和下颌前磨牙、磨牙的M、D弯曲根管试验组和对照组差异无统计学意义(P>0.05).(2)根管预备后疼痛发生情况:上颌磨牙和下颌前磨牙的D弯曲根管以及下颌磨牙的M、D弯曲根管试验组和对照组差异有统计学意义(P<0.05);上颌前磨牙的S、M、D弯曲根管与上颌磨牙和下颌前磨牙的S、M弯曲根管以及下颌磨牙的S弯曲根管试验组和对照组差异均无统计学意义(P>0.05).结论 凝胶型EDTA应用于弯曲根管较液体EDTA根管润滑效果好,术后反应轻.  相似文献   

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