切牙骨

Objective To investigate the influences of the stress on alveolar bone which was caused by various prosthodontia design for mandibular first molar after hemisection.

摘要］ 目的：研究下颌第一磨牙半切术后不同修复设计对牙槽骨应力的影响。

METHODS: Immunohistochemistry was applied to investigate RANKL protein expression in incisor teeth.

每只小鼠均取其下颌骨，应用免疫组织化学染色的方法进行小鼠切牙破骨细胞分化因子蛋白染色。

The symphysis is sectioned into two halves by malleting a spatula osteotome into the partially sectioned interdental osteotomy site.

唇皮层板和牙槽骨的水平以下的切牙根尖的切片，以第701号裂刺。切片的耻骨是分为两半的malleting一铲骨凿到部分切片间截骨网站。

The 3-D FE model of the maxilla and upper incisors of this study had proved to be precise and effective, and could be applied in the stress-strain analysis of the maxilla and teeth.

本研究建立的上颌骨和上切牙的三维有限元模型较为理想，可以作相应的颌骨、牙齿的生物力学分析；其建模技术较为独特而精准可行。

Based on this background, maxillary central incisors was prepared as residual roots model, the materials which has the similar physical properties and capabilities as that of the alveolar bone and periodontal membrane respectively were chosen.

基于上述情况，本实验以人离体上中切牙制备实验模型，以力学性能近似的材料模拟牙槽骨、牙周膜和桩冠修复后的上前牙，制作与上前牙口内受力角度相同的夹具及压力头，形成加载测试系统。

Stress distribution of the natural periodontal membrane, bionic periodontal membrane and the bone interface of the three models are calculated out by SuperSAP93, when the same load exerted to the three models. Results The stress change of the inside and outside surface of the natural periodontal membrane and bionic periodontal membrane is in the same tendency.

应用螺旋CT对上颌中切牙标本进行扫描，分别建立仿生种植牙、天然牙和骨性结合种植体模型，对3个模型施加同样的载荷，应用Super SAP93软件，计算出天然牙周膜和仿生牙周膜以及3种模型骨界面上的应力分布。

Methods In four kinds of prosthodontia design models, stress distributions in the remaining sections of the alveolar bone of the mandibular first molar with hemisection models were evaluated.

运用光弹应力冻结切片法，分析⑤⑥⑦、⑤⑥、⑥⑦、⑥固定桥修复模型的第一磨牙半切术后余留根牙槽骨应力分布状况。

MAIN OUTCOME MEASURES: The palatal bone thickness and bone thickness density were measured at 6 mm dorsally from the incisive canal.

主要观察指标：口腔内侧骨皮质上距切牙孔后缘6 mm处腭中缝的骨厚度及骨密度。

During the treatment of skeletal Class ill malocclusion in mixed dentition, the reverse Twinblock could procline the upper incisor, accelerated the development of maxillary and mandibular ramus, and restrained the development of mandibular body. A randomly allocated prospective study was required to fully evaluate the bone efficacy of this appliance.

反向Twinblock矫治器可使上切牙唇倾、位置前移；在治疗期间能促进上颌骨的发育，抑制下颌体的发育，促进下颌升支的增高；反向Twinblock矫治器的对上下颌骨的长期作用有待进一步研究。

The experiment of closing alveolar cleft by DO technique was successful. It suggests a new method to treat alveolar cleft, without alveolar bone grafting and donor area morbidities. Thus, long-term studies are very necessary to try to introduce it into clinic.

本实验采用DO关闭牙槽裂隙的动物实验研究是成功的，同时，也开辟了治疗牙槽突裂的新思路，可以避免传统牙槽裂植骨术需从患者供骨区切骨的组织损伤和痛苦；且手术操作较简单，可在局麻下完成。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新