牙根

Dealing with whether to keep or to rcmove activity tooth tissue valve of upper one third of rout diastema can be divided into experiment group and control group. Experiment group: keeping activity tooth tissue valve and restore it as told above. Control group: extracting activity tooth tissue valve. And then treat it in a routine way as root-canal therapy, restoration with baked-porcelain crown and metal crown.

对牙根上1/3纵裂的活动牙组织瓣的去、留分实验组和对照组，实验组：保留活动牙组织瓣，按上述方法修复；对照组：拔除活动牙组织瓣，常规根管治疗，桩钉固位，烤瓷冠或金属冠修复。

The main results are summarized as follows: The dynamics of coverage shows that: the coverage of fountain grass, crested dogtail and kikuyugrass are the highest all the time, the coverage of common berrmudagrass and weeping lovegrass are higher after three months from seeding.

其结果分别是：盖度动态变化分析表明：云南狼尾草，非洲狗尾草，东非狼尾草是盖度一直非常高的草种，普通狗牙根和弯叶画眉播种三个月后盖度较高，其次高羊茅的盖度也一直能满足要求。

Ultrasound was not capable of manifesting the trait of the cystic wall destructiveness and intracystic root absorption.

超声不能显示颌骨囊壁破坏及牙根吸收的特点。

The proportion of maxillary center incisors, maxillary lateral incisors, maxillary canines curved in mesiodistal were 11.17%, 16.19% and 21.43%, in labio-lingual were 39.59%, 40.00% and 29.59%, both in labiolingual and mesiedistal directions were 4.60%, 35.24% and 24.49%.

大约50％左右的上颌前牙根管存在中度弯曲：与上颌切牙相比，上颌尖牙的弯曲度略大而弯曲半径略小。

Of the 14 SMAs, 11 (79%) showed low to intermediate density as compared with muscles, 3 (21%) showed homogenous and intermediate density; 12 (86%) appeared as lobulate lesions; 10 (71%) had incomplete bone septa; 9 (64%) showed root resorption of the neighboring teeth; 13 (93%) showed cortical perforation; 6 (43%) had soft tissue masses; all SMAs showed well-defined margins. Of the 11 SMAs examined by enhanced studies, 9 (82%) showed strong enhancement.

SMA病变中11例(79%)平扫时与肌肉相比呈等低混杂密度，3例(21%)呈较均匀等密度，12例(86%)边缘呈分叶状，13例(93%)骨壳被穿破，6例(43%)形成软组织肿块，但病灶的边界都清楚，10例(71%)见不全骨性分隔，9例(64%)邻近牙根被吸收，11例行增强扫描的病例中9例(82%)呈显著强化。

Objective Observe and compare the results of malposed teeth treated with orthopedic treatment, which caused by periodontal disease, in maintaining the periodontal health aspect.

本研究中48名患者男18名，女30名，年龄25-40岁，平均年龄32岁，所有患者均患有不同程度的前牙病理性移位、松动、牙根外露等牙周病史。

Objective:To study the best method for slowing down the alveolar bones absorption and keeping the alveolar bones height of the full denture among the aged patients Methods:To observe the alveolar bones absorption under reserved and un-reserved fang s conditions respectively by comparing 79 cases of mantled full denture with 118 cases of ordinary full denture.

通过79例覆盖全口义齿与118例普通全口义齿的比较，观察在有无牙根保留的情况下，牙槽骨的吸收状况。

Res ults: The maxillary central incisor was similar to the maxillar y lateral incisor in stress distribution. The highest stresses were observed in the root surface, the liwest in the periodontal ligament, the alveolar bone between them .

结果：上颌中、侧切牙的应力分布基本相同；上颌中、侧切牙及其支持组织的应力分布不均匀，牙根部受应力最大，牙槽骨次之，牙周膜最小。

Mesial or mesial-buccal roots of the first molars (78%) were the predilection site of vertical root fracture.

长期咀嚼槟榔致反复、长期的过大牙合力与异常方向的牙合力可能是牙根纵裂发生的重要因素。

The results showed that there are stress concentration increase in contact area between tooth and post with mesial tooth structure decrease in PV force.

结果发现当受PV力时，牙根柱在残缺齿质交角处应力会随著齿质缺损越多而有明显集中。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。