研究下颌第一磨牙论文

牙齿的形态特征有助于改善牙齿计算机辅助设计和制造的过程,先前的研究主要采用二维图像,提供的信息有限。本研究采用三维几何形态学方法测量牙齿的三维形态

下颌第一磨牙是下颌牙齿从中间向两边数第6颗恒牙,位于牙弓后部,属于后牙。 下颌第一磨牙由牙冠、牙根和牙颈组成,牙体由釉质、牙本质、牙骨质和牙髓组成。 解剖 下颌第一磨牙","subtitleWithAvatar":[{"text":"张代杰 副主任医师 山东大学齐鲁医院 三甲 发布时间: 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\u0002下颌\u0001第\u0001一\u0001磨牙\u0003可\u0001分\u0001为\u0001牙\u0001体\u0001解剖\u0001及\u0001牙\u0001体\u0001组织\u0001解剖\u0001,\u0001牙\u0001体\u0001解剖\u0001由\u0001牙冠\u0001、\u0001牙根\u0001和\u0001牙\u0001\u0001","replaced":"概述下颌第一磨牙是下颌牙齿从中间向两边数第6颗恒牙，位于牙弓后部，属于后牙。下颌第一磨牙由牙冠、牙根和牙颈组成，牙体由釉质、牙本质、牙骨质和牙髓组成。解剖下颌第一磨牙可分为牙体解剖及牙体组织解剖，牙体"},"meta_di_info":[],"official_struct_abstract":{"from_flag":"disp_site","office_name":"有来医生网"},"site_region":"0","src_id":"9348_6899_2058_9496_6547","trans_res_list":["list_struct_abstract","medical_struct_abstract","general_pic","kv_struct_abstract","official_struct_abstract"],"ulangtype":1,"ti_qu_related":0.60547859378872,"templateName":"se_st_default","StdStg_new":1599,"disp_summary_lat":"1","wise_search":false,"DispUrl":"m.baidu.com/bh/m/detail/ar_8486110118597606177","is_valid":1,"brief_download":"0","brief_popularity":"0","material_data":{"material_sign1":"73329817","material_sign2":"1384661066","material_list":[{"key":"nid","value":"0"},{"key":"thread_id","value":"0"}]},"rtset":1674748800,"timeHighlight":0,"cambrian_us_showurl":{"logo":"NULL","title":"有来医生网"},"is_us_showurl":1,"site_sign":"6377359900320292902","url_sign":"314949167221325898","strategybits":{"OFFICIALPAGE_FLAG":0},"img":1,"resultData":{"tplData":{"footer":{"footnote":{"source":{"img":null,"source":"有来医生网"}}},"groupOrder":9,"ttsInfo":{"supportTts":false}},"resData":{"tplt":"se_com_default","tpl_sys":"san","env":"pc"},"url_trans_feature":{"antispam_url_ctrl":"0","antispam_chutu_ctrl":"0","struct_cont_sign":"0","struct_simhash":"0","cont_sign":"2147863270","cont_simhash":"1313448015666735546","page_classify_v2":"32768","m_self_page":"0","m_page_type":"0","rtse_news_site_level":"0","rtse_scs_news_ernie":"-1","rtse_news_sat_ernie":"0","rtse_event_hotness":"0","f_event_score":"0","f_prior_event_hotness":"0","cont_sign_8":"2147863270","struct_cont_sign_8":"0","spam_signal":"495396234291314688","time_stayed":"0","day_away":"38","ccdb_type":"1","nid":"0","thread_id":"0"}},"strategy":{"tempName_ori":null,"tempName":"se_com_default","type":"result","mapping":null,"tpl_sys":"san","module":"aladdin-san"},"comm_generaPicHeight":"75px","source_name":"有来医生网","belonging":{"list":"asResult","No":9,"templateName":"se_com_default"},"subtitleWithAvatar":[{"text":"张代杰 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牙合面外形方圆,4个牙尖,4条发育沟,拾面外形似“田”字形;少数五尖形者与下颌第一磨牙相似。 两根皆偏远中,根分叉度小。有时两根可融合成一根,也有极少数近中

牙牙根及根管形态的研究. 【摘要】： 根管治疗术是治疗牙髓病和根尖周病最主要的方法,而使用精确的影像学技术准确的了解牙齿内外的解剖结构是保证根管治

目的:利用CBCT技术研究下颌第一乳磨牙的牙根及根管形态.方法:收集3～10岁儿童拍摄的CBCT片,记录下颌第一乳磨牙牙根及根管的数目和分布情况.应

良好的根管预备应在根管清理的基础上保持根尖部的原有形态和位置。磨牙弯曲根管在预备过程中易出现台阶、侧穿、工作长度丧失、根尖敞开、根管偏移等,一直是根管治疗的难点。我们在

下颌第一磨牙的解剖形态特征为：\n颊面：呈梯形，牙合缘长于颈缘，近中缘直，远中缘突。颊面可见两

“三五三最”,最早萌出,下颌牙中体积最大,斜面窝沟点隙最多,五个牙尖,五条三角嵴,五条发育沟。看似复杂,但是也是有迹可循,像五瓣花一样美丽的合面形态,辨识度很高。 我看得到你浑

结论 单侧第一磨牙缺失且未修复患者会造成其牙合接触特征异常;18岁前单侧第一磨牙缺失且未修复患者会造成下颌骨不对称,18岁后单侧第一磨牙缺失且未修复患

99‘70‘学校代码：lj：10610K（二7199119四川大学七年制学生学位论文恒前牙与下领第一恒磨牙的论文题目——一壁室壁玺堑窒作者—一』型全一指导教师姓名**称