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- 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。
- mandibular first premolar 下颌第一前磨牙
- Anatomy and clinical significance of the root canal system and apical foramen of mandibular first premolars 下颌第一前磨牙根管系统和根尖孔解剖及临床意义
- 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。
- 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
- 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。
- This case report will present an immature mandibular first permanent molar with carious exposure treated by partial pulpotomy. 本篇病例报告即描述局部断髓应用于发育未完成恒牙第一大臼齿，因治疗龋齿引起牙髓暴露。
- 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。
- ObjectiveTo discuss the design and fabrication of the photoelastic model of mandibular first molar after hemisection. 目的探讨下颌第一磨牙半切术后光弹模型的设计和制作。
- Methods Microscrew implants were implanted below the mandibular first and second premolars of four Beagle dogs as anchorage to intrude the teeth. 目的研究国产微螺钉种植体支抗压低磨牙过程中种植体-骨界面结合状况及种植体稳固度。
- An awareness and identification of the RE can contribute to the successful outcome of root canal treatment in mandibular first molars. 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。
- RE is an usually small short root with a hook, which gratly increase the difficulty of root canal treatment for mandibular first molars. 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。
- 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。
- ResultsThe photoelastic modle of mandibular first molar with hemisection was manufactured, which was as similar as noumenon in appearance, parameter and boundary condition. 结果制作出几何形状、物理参数和边界条件与实体接近的下颌第一磨牙半切术后牙体及牙周支持组织的光弹模型。
- 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。
- Methods Five models of mandibular first molar of double implant-supported with different spatial arrangements were constructed by using threedimensional finite element method. 方法模拟不同空间排列的双种植体支持修复下颌第一磨牙的模型,在保证其它因素都不变的情况下,采用三维有限元法,分析种植体骨界面应力分布。
- 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。
