Paleoanthropologist David Strait of the University at Albany in New York state and his colleagues found that A. africanus evolved jaws, teeth, and a face that would have been particularly good at withstanding large forces on its premolars—precisely the place where humans and other primates crack large objects, such as nuts that are too big to chew with our molars.

紐約州奧爾巴尼大學(xué)古人類學(xué)家戴維·斯特雷特和他的同事發(fā)現(xiàn)高清国产黄片，南方古猿非洲種的頜骨春雨直播视频在线观看免费高清、牙齒和臉經(jīng)過演化，其前磨牙特別擅長經(jīng)受極大的力氣——人類和其他靈長類動物恰好就用前磨牙來咬碎像堅果一樣的大塊食物综合久久本道中文字幕www，大到我們的磨牙無法咀嚼96人人操人人干人人。

Methods: 50 maxillary first premolar and 60 maxillary second premolar were included in the study.

挑選拔除的50顆上頜第一前磨牙及60顆上頜第二前磨牙。

Results: Relative diagnostic accordance rate of the clinical exploration and four kinds of image processing setup was the highest（P＞0.01）in the first premolars. Relative diagnostic accordance rate of the clinical exploration and the pseudocolor image setup and negative image setup was the highest（P＞0.01）, and that of the clinical exploration and the pseudo3D image setup and positive image setup was the lowest（P＜ 0.01）, showing statistical differences in the second premolars.

結(jié)果：①第一前磨牙：4種圖像處理格局下鄰面齲的檢出結(jié)果與臨床診斷結(jié)果的符合率高中文字幕日韩专区最新，差異無統(tǒng)計學(xué)意義（P＞0.01）国产在线无码全黄；②第二前磨牙：負(fù)片和偽彩圖像格局下鄰面齲的檢出結(jié)果與臨床診斷結(jié)果的符合率高，差異無統(tǒng)計學(xué)意義（P＞0.01）国产性色AV网址无毒不卡；③正片和偽3D圖像格局檢出結(jié)果和臨床診斷結(jié)果的符合率低（P＜0.01）国产原创AV在线。

In the soft tissue measurements, the value of soft tissue facial angle and B'-Pos-FH in the first extraction group was less than those in the second extraction group significantly. After treatment all the patients had an increase in S-Ns-Pos angle, soft tissue facial angle, B'-Pos-FH and depth of mentolabial groove. At the same time, soft tissue convexity angle was diminished obviously. But the change was not significant between the two premolar extraction groups.

2在對軟組織項目的測量中，治療前第一前磨牙拔除組的軟組織面角97厕所偷拍超碰欧美老妇、頦溝傾角均小于第二前磨牙拔除組欧美操逼网站。，治療后2組均出現(xiàn)軟組織面凸角減少，頦凸角51国产精品视频、軟組織面角久久久久久久精品国产免、頦溝傾角、頦唇溝深度增加www.zipai；但2組在各項測量項目的變化上無顯著組間差別久久久精品国产亚洲Av。

Methods:7 cases of classⅡ,division 1 maloclusion were treated.Upper first premolar and lower second premolars were extracted in all cases.Lower first molars were mesially moved by means of segmental arch. Cephalometric analysis was used to evaluate the effects of the treatment.

應(yīng)用片段弓技術(shù)對7例安氏Ⅱ類1分類患者啪啪亚洲，通過拔除上頜第一前磨牙及下頜第二前磨牙，使下頜第一磨牙較快地向近中移動www.亚洲欧洲，糾正磨牙Ⅱ類錯牙合關(guān)系。

Anchorage loss measured at the first premolar averaged 1.3 mm,but the crowns tipped 3.5?distally.During distalization with Distal jet,the first premolar did not tend to tip mesially as found in many investigation of other intraoral distalizing appliance.

每側(cè)第一前磨牙的支抗喪失平均為1.3mm并伴3.5 的牙冠遠(yuǎn)中傾斜欧美日韩免费一区中文字幕，這一結(jié)果不同于其它口內(nèi)磨牙遠(yuǎn)移裝置所造成的前磨牙牙冠近中傾斜黄色视频怎么搜才好看，與國外對同類矯治器的觀察結(jié)果相似。

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

離體第一前磨牙69個欧美嗷嗷叫，第二前磨牙93個免费乱伦视频网址，攝近中遠(yuǎn)中向的X線片，用Photoshop5.0軟件分析根管俄欧美激情A片在线观看，用Weine氏法測量根管的彎曲度在线观看亚洲视频，測量角度大于18度時，則認(rèn)為根管存在明顯的彎曲视频se，根管的構(gòu)型采用Vertucci分類法欧美牲交免费一级A片影院。

Methods: Fifty-fix adolescents were chosen and divided into first premolar extraction and nonextraction groups, with 30 and 26 patients respectively. The pretreatment and posttreatment panoramic radiographs were taken. The indexes of third molar eruption space, distance from third molar to occlusal plane and the length of mandible were measured and analyzed.

選擇56例上下頜第三磨牙均存在的患者進(jìn)行方絲弓正畸治療，按照第一前磨牙拔除與否分為拔牙組（30例）和非拔牙組（26例）美女扒开下边喷水黄网站，利用術(shù)前術(shù)后曲面斷層片對患者上下頜第三磨牙萌出間隙5Ⅴ99COm、第三磨牙與胎平面的距離以及下頜長度進(jìn)行測量分析。

Chondrocytes isolated from the same calf suspended in 30% pluronic were then"painted"onto the articular surface of the scaffold and implanted into subcutaneous pockets on the dorsa of athymic mice.

實驗三免费看性爱，在犬雙側(cè)下頜第三污视频久久久、四前磨牙和第一磨牙頰側(cè)制備根向深5mm的頰側(cè)骨上袋型牙槽骨缺損動物模型。

Objective: To study the changes of upper and lower third molar position in patients treated with first premolars extractions.

目的：研究第一前磨牙拔除后對第三磨牙位置變化的影響日韩最大的黄色网站，探討影響第三磨牙萌出的客觀因素日韩二区精品。

cuspid teeth, canines：尖牙

切牙 incisor teeth, cutting teeth | 尖牙 cuspid teeth, canines | 前磨牙 premolars, bicuspid teeth

molar：磨牙

用方程式表示如下: πV=nR式是根據(jù)牙的形態(tài)和功能,可分為用以咬切食物的切牙(incisor);用以撕裂食物的尖牙 (canine teeth)和用以研磨食物的前磨牙(premolar)與磨牙(molar).

premolar：前磨牙

(canine teeth)和用以研磨食物的前磨牙(premolar)與磨牙(molar). 牙排列成上下兩列,各型牙數(shù)目和排列情況常用牙式表示.

premolar teeth：前磨牙

尖牙 canine teeth | 前磨牙 premolar teeth | 磨牙 molar teeth

premolar teeth：槽牙,前臼齒,前磨牙

premodern economic history 近代經(jīng)濟史 | premolar teeth 槽牙,前臼齒,前磨牙 | premolded asphalt panel 預(yù)制瀝青板

second premolar：第二前磨牙

21,第一前磨牙 first premolar | 22,第二前磨牙 second premolar | 23,第一磨牙 first molar

first premolar：第一前磨牙

20, 尖牙 canine tooth | 21,第一前磨牙 first premolar | 22,第二前磨牙 second premolar

MOLARS：磨牙

牙式 根據(jù)牙的形態(tài)和功能可把牙劃分為切牙(incisors)五月丁香六月婷婷在线、尖牙(canine teeth)人人黄色网、前磨牙(premolars)和磨牙(molars)(圖5-6A). 切牙用以咬切食物,尖牙和磨牙有撕裂食物和研磨食物的功能. 不同的牙按一定的規(guī)律排列成上、下兩列,

premolars：前磨牙

3国产精品久久久综合桃花网、 前磨牙(premolars)又名雙尖牙(bicuspidteeth),位于尖牙之后,磨牙之前,左右上下共8個. 牙冠呈立方形,又一個咬合面,一般為雙尖,下頜第二前磨牙有三尖者,前磨牙有協(xié)助尖牙撕裂及協(xié)助磨牙搗碎食物的作用. 牙根扁,亦有分叉者,

premolars, bicuspid teeth：前磨牙

尖牙 cuspid teeth, canines | 前磨牙 premolars, bicuspid teeth | 磨牙 molars