双根

下颌侧切牙双根管一例报告

Double root canal of mandibular lateral incisor : a case report

目的：研究双根单冠种植修复的临床应用效果。

Objective : To study the clinical effects of implant restoration of double implant-supported single crown .

上颌第二磨牙腭侧双根及五根管一例：病例报告

Maxillary second molar with two palatal roots and five root canals

双根克氏针固定治疗跟骨粉碎性骨折

Fixation of comminuted calcaneal fracture with two pieces of Kirschner wire

双根上颌第一前磨牙牙根分叉度和根管交叉度的研究

Root separate angle and canal intersection of two - rooted maxillary first premolars

双根单冠种植修复的临床研究

Clinical Study of Double - Implant-Supported Single Crown

不同投照角度X线片诊断下颌切牙双根管的评价

Evaluation of Altering X-ray Projection Angulation for Successful Twin Canal Diagnosis in Mandibular Incisors

不同桩材料对双根管桩核冠牙本质应力的影响

Effects of post material on stress distribution in dentin of twin root canal dowel-core crown

双根管牙及其桩核烤瓷冠三维有限元模型的建立

Construction of the three-dimensional finite element model of the twin-root canal dowel-core and PFM crown

前言：目的：建立双根口服液除杂质的工艺方法。

Objective : To establish a procedure of removing the impurity in double-root oral solution .

不同嫁接方式对黄瓜双根嫁接苗成活率及生物学特性的影响

Influences of Different Grafting Patterns on Surviving and Growth Characteristics in Cucumber Seedings of Double Root

下颌切牙均为双根管1例报告及文献复习

Double root canal of all mandibular incisors : Report of one case and review of the literature

病例报告：双根管下颌第二前磨牙显微根管再治疗

Case Report : Root canal retreatment under dental microscope of a mandibular second premolar with two canals

电流互感器二次双根导线并绕的分数匝误差补偿的计算问题

Calculation Problems of Error Compensation of Fractional Turns of Two Parallel Conductors in Current Transformer Secondary Windings

双根管桩核冠的三维有限元分析

A study of stress distribution in twin-root canal with dowel-core crown by three dimension finite element method

中、侧切牙双根管率分别为35.9%和27.5%；

The double root canal was found in 35.9 % of central incisors and in 27.5 % of lateral incisors .

上颌第二磨牙四根管发生率低，且主要类型为近颊双根管的四根管，腭侧双根管的四根管十分罕见。

Incidence rate of4 root canals in maxillary second molar is very low and most molars have only two mesiobuccal root canals .

【结果】①上颌第一磨牙和第二磨牙近中颊根的双根管率分别为81.48%和49.70%。

Results ( 1 ) 81.48 % of first molars and 49.70 % of second molars in the mesiobuccal roots had two canals .

水样用硝酸调pH<2后，以双根活性炭玻璃填充柱连续吸附；将吸附有机物的活性炭在氧气流中燃烧热解、用微库仑法测定其卤化氢。

Water samples are adjusted to pH < 2 , then passed through double glass packed columns filled with active carbon for consecutive absorption ;

近中位、舌向位和垂直位则双根的比例高，分别为60.417%、58.334%和47.619%。

The proportion of two roots of mesioangular impaction , linguoangular impaction and vertical impaction is 60.417 % , 58.334 % , 47.619 % respectively .

目的用三维有限元法研究3种不同桩核材料修复双根管桩核冠前后牙本质中的应力分布，为临床双根管桩核冠选择合适的桩核材料提供理论依据。

Objective To investigate stress distribution of different material restored post-cores in dentin of twin-root canal PFM crown and provide a theoretical guidance for clinical use .

结果：上颌第一恒磨牙近颊根Ⅲ型根尖孔26.9%；双根管率为56.25%，三根管率为7.5%。

Results : 26.9 % of mesiobuccal root had type III apical foramen , 56.25 % of mesiobuccal root had two canals , 7.5 % teeth had three root canals .

氢气加热源与双根光纤的相互作用是研究一定条件下制作的光纤耦合器的熔融度D的变化规律。

In addition , the interaction between hydrogen heating source and two optical fibers is virtually studying the variation regular of melting degree of optical fiber couplers which made on certain conditions .

结果中国人下颌恒切牙为单根管和双根管，根冠段、根中段及根尖段双根管检出率分别为22.5%，30.0%，15.0%；

Results The double root canal comprised 22.5 % , 30.0 % , and 15.0 % in crown third , middle third , and apical third root canals of the mandibular permanent incisors , respectively .

在根管显微镜下观察并测量双根的上颌前磨牙颊、腭根根尖的距离，记录以颊根为标志，腭根所在的位置。

The following observations were made by root canal microscope : the distance of buccal root to palatal root of maxillary teeth . The location of palatal root marked as buccal root was recorded . Results : 1 .

本试验应用三维有限元应力分析法，理论探讨箍对上颌双根管前磨牙铸造桩核修复后牙体应力分布的影响。

This research studies the ferrule effect on double-canalled maxillary first premolar to test the hypothesis that the design of ferrule is beneficial to double-canalled teeth restored with cast post and core and metal crown , through three-dimensional finite element analysis .

结果表明：后区附双根压力棒新型上销牵伸装置对后牵伸区须条的控制增强，可以提高细纱机的后区牵伸能力，增大总牵伸倍数，有利于细号纱纺纱质量的提高。

The test shows that double press bar top pin in back zone draft set has bigger control of slivers in back zone , and can enhance back zone draft ability of spinning frame , increase draft multiple , and enhance fine count yarn quality .

结论设计以胸廓内血管蒂的第6肋软骨瓣（单根）、第6、7肋软骨瓣（双根）和剑突瓣移植术3种，可用于关节软骨缺损修复。

Conclusion Three transplantation , the bone flap of 6th single costal cartilage and the bone flap of 6th and 7th double costal cartilages , and the bone flap of xiphoid with internal thoracic blood vessel were able to be used to repair defect of articular cartilages .

其中根管锥度为0.1这一组模型根管口应力最大，三种不同解剖形态的牙齿模型中最大为双根管三根牙齿模型，达到14.93Mpa。

Which root canal taper of the teeth models are 0.1 in this research suffered the greatest stress . In three different forms of dental anatomy models , the biggest stress of root canal orifice occurred in the tooth with double-root and three-root canal , to 14.93 Mpa .

结果：①脊神经后根有复根现象，双根的占24.3%（双侧），三根占0.4%（双侧），而且有1.32%的前根位于后根上方的变异；

Results : About 24.3 % of the spinal dorsal root had two roots on both sides , and 0.4 % of them had three roots . A few cases ( 1.32 % ) of the spinal ventral roots emerged higher than that of spinal dorsal roots from spinal cord .