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ABSTRACT:OBJECTIVETo study the correlation between anatomic structure of the inferior alveolar nerve canal and dental implantation by measuring mandible innervation esemplarsMETHODSThe intramandibular course of mandibular canal and its dimendion were measured in 15 mandibles with teeth; the relationship between blood vessel and nerve was observed in 5 fresh samples in which the artery was filled; and then the data were analyzed by statisticsRESULTSThe mandibular canal was close to the lingual side and the inferior margin of the mandible, the mandibular canal and the 10mm underside of mandible were parallel in the region of the first and the second molars, it runned outboard to genal aperture when it was hereabout genal aperture, and the blood vessel lay above nerve in the mandibular canalCONCLUSIONIn implant operation performed according to normal anatomy, injury to inferior alveolar nerve may be avoided.
［目的］探讨下颌管的解剖结构与牙种植的关系［方法］选取15具牙列完整的成人离体下颌骨标本和5具经过动脉血管内灌注的新鲜标本，测量下颌骨在每个牙位截面上有关牙槽嵴及下颌管的相关数据，进行统计学分析［结果］牙槽嵴顶以及下方10mm宽度由前向后逐渐增宽；牙槽嵴由上向下逐渐增宽；下颌管位于下颌骨体内下方走行中偏舌侧，并近下颌骨下缘，在下颌第1，2磨牙区下颌管走行与下颌下缘成平行状，在近颏孔处转向外和向颊侧出颏孔；下颌管内血管位于下牙槽神经之上［结论］牙种植术中按正常解剖部位并且侧重颊侧骨板操作，可避免损伤下牙槽神经；如果术中下颌管内突然涌出大量新鲜血液，则提示若继续手术可能损伤下牙槽神经。
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The lower first molar moved and rotated to distal, the mesial rotate to buccally and the distal rotate to lingually.
5的移动趋势是袷向伸长，冠向近中根向远中倾斜，冠舌向根颊向转矩，且整体受力较小。
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Distobuccal root canals were found obvious curve out by the rate of 80% in mesiodistal direction,45% in buccolingual direction.
远中颊侧根管在近远中方向有80%，颊舌方向有45%出现大于5°的明显弯曲，弯曲位置多位于根中1/3，且近远中向的弯曲明显大于颊舌向（P.05）。
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MB1 root canals of the mesiobuccal root canals in maxillary molars were found obvious curve out by the rate of 82.5% in mesiodistal direction, 77.5% in buccolingual direction and there is no difference of curvature degree in the two directions.
结果：1上颌第一磨牙腭侧根管通畅、较直。2远中颊侧根管在近远中方向有80%，颊舌方向有45%出现大于5的明显弯曲，弯曲位置多位于根中1/3，且近远中向的弯曲明显大于颊舌向(P.05)。3上颌第一恒磨牙近中颊根颊侧根管在近远中方向、颊舌方向分别有82.5%、77.5%出现大于5的明显弯曲。
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Objective To investigate the clinical discovery and expanding of the second mesiobuccal canal (MB2) in maxillary first molars.
目的探讨在临床上上颌第一磨牙近中颊根第二根管(MB2)的发现及扩通。
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This paper reports the case of a maxillary first molar that presented two root canals in the Mesiobuccal root.
本论文为在职专班研究生以案例报告，叙述上腭第一恒磨牙近中颊侧牙根，发现两个根管的案例。
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A great predominance of two very close canals in the mesiobuccal root of maxillary molars has been demo...
根管治疗目前的成功率虽然已很高，但是在上腭第一恒磨牙有近中颊侧第二根管案例，假使无法找到或者充填好，那么失败的可能性就增加了。
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RESULTS: When torque force loads were applied, the peak values of VonMises stress on buccal side, lingual side and mesiodistal side of the implant neck were 0.624, 0.652, and 0.603 MPa, respectively, and the peak values of displacement were 0.066, 0.059 and 0.063 μm, respectively.
结果：在扭转力载荷作用下，种植体颈部颊侧、舌侧及近远中侧的VonMises应力峰值分别为0.624，0.652和0.603 MPa；位移峰值分别为0.066，0.059和0.063 μm。
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In this study, the position of implant inclined to the lingual side slightly. When torque force was exerted on implants the lingual, buccal, and mesiodistal maximum Von-Mises stress were 0.65MPa, 0.624MPa and 0.603MPa, respectively.
由于本实验中种植体种植的部位略偏向舌侧，当种植体受到扭力作用的时候，其舌侧、颊侧及近远中侧的最大Von-Mises应力分别为0.65MPa、0.624MPa、0.603MPa。
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METHODS:Fifty two permanent maxillary first molars,which were diagnosed as pulpitis and periapical periodontitis clini cally,were selected.The pulp chamber floors were examined and detected to locate the mesiolingual canals(MB2) by naked eyes and SOM respectively.
由于其近颊根通常有近中颊和近中舌(MB2 ) 2个根管，而其近中舌根管细小且根管口常较为隐蔽，因此，Weine认为上颌第一恒磨牙根管治疗失败的一个主要原因是治疗中遗漏了MB2根管。
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deuterocone：上第二尖(上近中颊尖),前臼齿的牙尖
deuterium 氘(音刀) | deuterocone 上第二尖(上近中颊尖),前臼齿的牙尖 | deuteroconid 下第二尖(下近中颊尖)
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deuteroconid：下第二尖(下近中颊尖)
deuterocone 上第二尖(上近中颊尖),前臼齿的牙尖 | deuteroconid 下第二尖(下近中颊尖) | deuteroconidium 半分生孢子
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hypocone：上次尖
后尖发展为远中颊尖,远中舌尖则来源于牙跟座所形成的上次尖(hypocone). 下颌磨牙的五尖中,有二尖来源于三角座,原尖发展为近中颊尖,后尖发展为近中舌尖,前尖消失. 其余三尖来源于牙跟座,下次尖(hypoconid)发展为远中颊尖,
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mesiobuccal cusp：近中颊尖
mesial drift of anchorage molar 支抗磨牙的前移程度 | mesiobuccal cusp 近中颊尖 | minor tooth movement ,MTM 小范围牙移动