No significant relationship between gender, age and tooth fracture was found.
尚未看出性别、年龄与牙折发生间的关系。
To discuss the relevance between tooth fracture and the age growing, the concept of fracture rate has been quoted.
引用折裂率的概念探讨牙折裂与年龄增长的相关性。
Two types of load were applied to investigate the change of tooth fracture resistance after restored with MOD inlay.
目的：对直接树脂和间接树脂嵌体修复后牙体的抗力进行三维有限元研究。
Methods Hemisections were performed on reserved canals of incomplete tooth fracture, complete root fracture and furcation involvement after root canal therapy.
方法选择隐裂、根折或根分叉病变患者，对欲保留牙根进行根管治疗后，行半牙切除术。
Since pulp injuries are reported in tooth fracture, displacement and avulsion, it is commonly thought that pulp injuries were involved in almost every type of dental injuries.
牙髓组织损伤可存在于牙齿折断、牙齿移位和牙齿全脱臼。
The method can debase the possibility of the tooth fracture during and after treatment. Methods The patients with cracked teeth have the symptom of pulpitis or periapical periodontitis.
方法选择在口腔门诊首次就诊的具有牙髓炎或根尖周炎症状的隐裂牙，采用预成金属冠修复后再作牙髓病治疗。
Fracture tooth of gear shaft in well drilling pump was analysed by chemical analysis, mechanical testing metallographic examination macro and microfractography.
采用化学成分分析、力学性能测定、金相检验以及断口宏、微观分析等方法，对钻井泵齿轮轴断齿进行了分析。
The results show that the fracture may be due to improper heat treatment which leads to over hardness of the thread part and the joint of thread part and tooth part.
结果表明，断裂是由于热处理工艺不当、管子钳活动钳口齿部、螺纹部以及螺纹和齿部的过渡连接部分硬度过高引起；
To study the influence of the tooth contact half cycle (TCC) steel plate on cortical bone blood supply at the fracture site.
研究齿接触半环抱钢板对骨折局部钢板下皮质骨血供的影响。
Conclusion The main supporting force position is on abutments of the bridge supported by tooth-implant; The implant neck is the most possible area for fracture.
结论：天然牙—种植体联合桥主要支撑力的部位是颈缘处，该处为种植体折断机率最大的区域；
Objective To estimate the effect of restorative treatment on conserving posterior crown fracture tooth.
目的：评估用修复的方法保存后牙牙冠纵裂牙齿的效果。
Objective to study effects of treatment of long bone fracture with NiTi shape memory saw tooth arm embracing fixator.
目的分析镍钛形状记忆锯齿臂环抱内固定器治疗长管状骨骨折的疗效。
Objective:To observe the clinical effect of tooth extrusion with progressive methods for anterior teeth with crown-root fracture.
目的观察牙冠延长术治疗断缘位于龈下的冠根联合折断牙的临床效果。
Root canal treatment and finished tooth, lost in the pulp cavity nutrition supplies such as nerves, blood vessels, lymphatic, makes itself become more brittle fracture of teeth.
且做完根管治疗的牙齿，失去了牙髓腔中神经、血管、淋巴等营养供应，使得牙齿本身变得较脆易断裂。
Dental trauma may happen to a single tooth or more. Avulsion was most like to accompany with other traumatic teeth. Crown fracture was also like to involve more than one tooth.
牙创伤可以在单颗牙齿发生也可累及多颗牙，牙脱出最容易累及多颗牙，冠折也常累及多颗牙。
Conclusion: Tooth extrusion method with new method is an effective method for anterior teeth with crown-root fracture.
结论：使用改进的固定矫正器进行牙根牙合向牵引治疗前牙冠根折的方法有效可行。
To evaluate the effects of the different amount of residual tooth on the fracture resistance ability of lower premolars restored with fiber quartz-fiber post-core and full crown.
评价不同牙体剩余量对石英纤维桩复合树脂核全冠修复下颌前磨牙抗折性能的影响。
To evaluate the effects of the different amount of residual tooth on the fracture resistance ability of lower premolars restored with fiber quartz-fiber post-core and full crown.
评价不同牙体剩余量对石英纤维桩复合树脂核全冠修复下颌前磨牙抗折性能的影响。
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