牙

Xin Hua Hospital,Tongzhou District,Beijing101100. Objective To find an easy and effective therapy to cure patients with pulp necrosis or chronic pe-riapical periodontitis.Methods 184patients（age18～60）with184infected permanent teeth were randomly divided into two groups.The experimental group was filled with the VITAPEX paste plus gutta percha.

目的 针对牙髓坏死、慢性根尖周炎病例，探求简便有效的治疗方法方法在临床选择18～60岁的牙髓坏死、慢性根尖周炎病例184例，184颗患牙，随机分两组，第一组采用VITAPEX糊剂加牙胶尖一次法根充治疗完成。

In order to analyze the association of the periodontitis severity with changes of the human dental pulp, one hundred caries-free and restoration-free periodontally involved teeth with different periodontic destruction were studied histologically.

为了分析牙周炎的病变程度与牙髓组织改变的关系，对100个牙体完好的具有不同牙周破坏程度的牙周炎患牙进行了组织学观察，分析牙根暴露量、牙周袋深度和牙齿松动度与牙髓病变的关系。

In maxillary anterior edentulous regions, ridge deficiency may preclude a good pontic fit and esthetic result.

上颚前牙无牙区的牙脊缺损，如仅以传统牙桥桥体制作则可能会造成美观不良的问题。

After bridge insertion, the pontic of fixed bridge re- stored additional force, but the change of stress in the peri- odontium of premolar and molar is very diffierent.

固定桥修复后桥体承受了增加的载荷，双尖牙和磨牙牙周膜应力的变化规律是不相同的，双尖牙牙周膜应力的增加幅度大于磨牙。

For the abutment with severe bone lost, pontic width reduction can significantly reduce the stress in PDL of it, and protect the health of remaining periodontium of abutment.

对于基牙牙槽骨高度降低的固定桥，桥体减径可以更加明显地降低基牙牙周膜应力，对桥基牙起到保护作用。

Aim:To assess the role of Interleukin-1 receptor antagonist(IL-1ra) in the pulpal inflammation.

目的：了解正常人牙髓组织及炎性牙髓组织中白细胞介素1受体拮抗剂(IL-1ra)的表达，探讨它在牙髓组织正常防御和内毒素性牙髓炎中的作用机制。

METHODS:Treatment records of 1100 teeth with acute or chronic pulpitis or chronic apical periodontitis were compared.

选择患急、慢性牙髓炎和慢性根尖周炎 80 0例 110 0个患牙，随机分为两组，对照组 5 14牙采用常规根管治疗术即两次法，实验组 5 86牙采用一次法进行根管充填，观察各组术后近期临床反应。

They were divided into two groups, and operated pulpotomy using formocresol and ferric sulfate respectively. The children were followed up after 6 months and 1 year. Successful rates of pulpotomy were summarized statistically.

选择3~5岁儿童的第一乳磨牙、4~6岁儿童的第二乳磨牙共45人，80颗乳磨牙深龋近髓的病例，随机分为两组，分别行甲醛甲酚和硫酸铁溶液牙髓切断，术后6个月及1年复查，分别统计两组成功率，比较两组的疗效差异。

Methods: 80 primary molars with deep caries close to the pulps were selected. They were divided into two groups, and operated pulpotomy using formocresol and ferric sulfate respectively. The children were followed up after 6 months and 1 year. Successful rates of pulpotomy were summarized statistically.

选择3~5岁儿童的第一乳磨牙、4~6岁儿童的第二乳磨牙共45人，80颗乳磨牙深龋近髓的病例，随机分为两组，分别行甲醛甲酚和硫酸铁溶液牙髓切断，术后6个月及1年复查，分别统计两组成功率，比较两组的疗效差异。

Its mechanism is downward and backward rotation of the mandible, the retrusion of the lower incisors, the protrusion of the upper incisors and the forward growth of maxilla.

FR-Ⅲ是矫治替牙期前牙反的理想方法之一，其机理是下颌骨向下、向后旋转，舌倾下切牙，唇倾上前牙，促进上颌骨向前生长。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。