牙

Upper first molar moved 4.14mm distally, and the upper incisors moved 0.66mm mesially.

上颌第一磨牙向远中平均移动4.14mm，上颌中切牙向唇侧移动0.66mm。

The fluorescent bands formed in both mesial and distal cementum.Conclusion The results don't support the point that transseptal fibre or force of molar eruption makes teeth migrate mesially; the mesial migration of teeth is related with the reconstruction of alveolar bones and the stress distribution in the bones.

实验结果不支持越隔纤维作用或磨牙萌出力作用引起牙齿近中移动的观点；牙齿近中移动与颌骨内应力分布有关，牙槽骨改建的量与牙齿近中移动量呈正相关。

Upper and lower incisor both had controlled tipping movement. The crown of incisor moved mesially and had root apex were fixed relatively. The center of rotation was close to root apex. The upper and lower molar moved differently.

结果：唇挡治疗后，SNA、SNB分别增加1.02°和0.97°(P.05)，上下切牙前移均是牙冠向近中倾斜，而根尖相对固定的控制性倾斜，旋转中心接近根尖。

Maxillary second molar has five subtype, Type A: absence of root fusion, Type B: presence of mesiobuccal and distobuccal root fusion, Type C: palatal root with anyone of buccal root fusion of molar with three roots, Type D:complete root fusion of molar with three roots, Type E:pseudofusion of molar.

分析其牙根发育沟之发生率、牙根发育沟之长度、牙根发育沟至牙骨质牙本质交界的距离，以及牙根发育沟最深点的深度、占牙根长的位置、与到牙根根管的距离，并且将牙根分类为上颚第一大臼齿，仅一种分类。

Radiograph of teeth in mesiodistal direction were taken.

结果 ：单根单根管上颌第二前磨牙的根管弯曲仅有 2个，单根双根管牙齿的根管明显弯曲有 6个，在 2 8个双根牙中有明显根管弯曲的 6个，根管弯曲的牙齿总发生率为 6 。6 %(14 /2 13)。

METHODS: Sixty-nine extracted mandibular first premolars and 93 mandibular second premolars were used.Radiographs of teeth in mesiodistal direction were taken.

离体第一前磨牙69个，第二前磨牙93个，摄近中远中向的X线片，用Photoshop5.0软件分析根管，用Weine氏法测量根管的弯曲度，测量角度大于18度时，则认为根管存在明显的弯曲，根管的构型采用Vertucci分类法。

Results Among the students surveyed, the rates were above 75% in toothbrush at least twice a day, brush teeth up and down, not eating sweet food before sleeping but the proportion of the students brush morsal surfaces and facing beside tongue, brush teeth after meals or use toothpick and dental floss less than 30%.

结果每天刷牙2次以上、采用梳头式或转圈式刷牙、刷咬颌面和舌侧牙面、牙刷头向上放置、晚上睡前不吃甜食的人数比例大于75%，而饭后刷牙、经常使用牙签和牙线、定期进行口腔洁治的人数比例小于30%。

The tooth disease with common kid has tooth gingivitis (namely tooth beautiful flesh has symptom of red, haemorrhage) with dental caries (common calls bug eat by moth the tooth, its symptom is a tooth nigrescent, molten, into the hole).

青年人常见的牙病有牙龈炎（即牙花肉有红肿、出血症状）和龋齿（俗称虫蛀牙，其症状是牙齿发黑、变软、成洞）。

The nonsurgical and nonextraction of patients make the upright and distal movement of molar and correction of midline more difficult.

非手术、非拔牙的选择给磨牙的竖直、远中移动及中线的调整带来很大困难。

Both nonextraction and extraction treatment can acquire successful results as long as the design and treatment is reasonable, but extraction treatment is more efficient in correcting dento-occlusal abnormality and centerline.

但只要合理设计和治疗，拔牙与非拔牙病例都能获得良好的矫治效果，拔牙矫治更有利于咬合关系和中线的调整。

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。