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- Methods Micro-CT was used to scan the intact maxillary first premolar. 方法用M icro-CT对选取的完整上颌第一前磨牙进行扫描;将获得的CT影像通过M im ics8.;1软件进行拟合;初步形成模型。
- They had four first premolar extraction, but the outcomes were not so satisfied. 此时如增拔上下第一大臼齿，则可使臼齿区域的近远心关系及病人侧貌得到良好的改善。
- Conclusion: The FEM of the fracture tooth of first premolar can be established by computerized tomography (CT) and the FEM. 结论：将CT技术与有限元法有机结合，可以建成上颌第一双尖牙冠根纵折模型。
- With three different retainer designs, the retainer on the second premolar and the first molar exerted the smallest stress on the abutment and its periodontal tissue, while the retainer on the first premolar and the first molar had the largest stress. 在3种不同的固位体设计方式中，固位体放置在第二前磨牙与第一磨牙之间时，基牙及牙周组织受力最小；固位体放置在第一前磨牙与第一磨牙上，基牙与牙周组织受力最大。
- Objective: To analyze the effect of the change of the tapers on the stress and the distribution on the root canal wall resulting from after the root canal preparation on maxillary first premolar. 摘要目的：分析上颌第一前磨牙根管预备后锥度变化对根管壁应力及其分布的影响。
- The three dimensional finite element model of the fracture tooth of first premolar was been established by the special software.The gap of the model was been replaced by Clearfil SE Bond. 随着粘接材料性能的不断提高和粘接技术的不断更新，粘结再植术治疗后牙纵折，即将患牙拔出、行即刻根管治疗、粘接、再植已成为保存纵折后牙的新方法，并在临床上已取得较为满意的疗效。
- Absence of more than two first premolars or absence of a first and a second premolar. 缺少超过两个第一前臼齿或者一个第一和一个第二前臼齿。
- Mandibular left first premolar tooth 下颌左第一前磨牙
- Mandibular right first premolar tooth 下颌右第一前磨牙
- Maxillary left first premolar tooth 上颌左第一前磨牙
- Maxillary right first premolar tooth 上颌右第一前磨牙
- AIM:To enhance the dentists to realize the presence of two root canals in the mandibular first premolars. 目的:提高临床医生对下颌第一前磨牙存在双根管的认识。
- RESULTS:It was easily occurred the type of two root canals in the mandibular first premolars were neglected during endodontic treatments. 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。
- Methods :First premolars that would be extracted according to the therapeutic schedule were used in this study as samples. 方法： 以正畸临床即将拔除的正常第一双尖牙为实验样本，分为实验组和对照组。
- Objective:To explore the incisors moving modus of Angle Class I malocclusion with crowding treated by removing four first premolars . 方法:安氏I类错牙合牙列拥挤病例20例,均拔除4个第一前磨牙,采用方丝弓细丝弓技术矫治,牙性支抗(弱支抗)。
- Leaving her first job was a watershed in her life. 辞去她的第一份工作是她生活中的一个转折点。
- Cook the meat quickly at first to seal in the juices. 一开始要大火烧肉，以便保存肉汁。
- In the word "mother" the stress is on the first syllable. 在"mother"这一字里，重音在第一个音节上。,在＂mother＂这一字里，重音在第一个音节上。
- His illness was more serious than the doctor first thought. 他的病较医生原来以为的更严重。
- Passengers with cars must embark first. 带汽车的乘客必须先上船。
