下颌弓

小鼠牙胚发育在下颌弓培养模型中的动态观察

Tooth development in vitro cultured mouse mandibular arch

下颌弓表面上皮由培养前的单层扁平上皮发育为为复层鳞状上皮，少部分下颌弓表面有角化物堆积。

The epithelium of the mandibular arch changed from monolayer to polylayer with accumulation of keratose in some arches .

目的临床矫治上下颌骨宽度不调-下颌弓狭窄的病例时，既往采用的方法是正畸治疗调整下颌牙列内牙轴的方向。

Objective When clinical correction of the narrowing of mandibular arch , the existing protocol was correcting the teeth axis of mandible .

方法3例病人均为发育性下颌弓狭窄，同时伴有下颌后缩或上颌前凸畸形。

Methods Three cases of patient with developmental narrowing of the mandibular arch , associate with retrognathia of mandible or protrusion of maxilla .

青少年与成人比较，发现下颌弓角、下中切牙突距和上颌第一磨牙位置成人大于青少年，A点突度成人小于青少年。

The angle of mandibular arc , the convexity of lower incisor and the position of upper first molar were larger in adults than in adolescents , whilst the convexity of A was smaller in adults than in adolescents .

AngleⅡ2类错牙合畸形患者上下颌牙弓宽度差与AngleⅠ类轻度错牙合畸形患者无显著差异（P>0.05）；

The width differences were not significant in subjects with Class ⅱ division 2 malocclusion and in the mild Class ⅰ malocclusion sample ( P > 0.05 );

AngleⅡ2类错牙合畸形患者上颌中、后牙弓宽度和下颌牙弓宽度较AngleⅠ类轻度错牙合畸形患者的牙弓宽度窄，差异有显著性（P<0.05）；

The maxillary premolar , molar width and mandibular width were significantly narrower in subjects with Class ⅱ division 2 malocclusion than in the mild Class ⅰ malocclusion sample ( P < 0.05 ) statistically ;

方法选择16例安氏II类1分类和I类上前牙唇倾患者经戴用上颌全腭导板3个月后分别记录治疗前后下颌牙弓宽度的变化，并做统计学处理。

Methods : 16 patients aged 13 ~ 16 years with Angle Class II or Class I malocclusion underwent the treatment by improved biteplate for 3 months , the width of mandibular arch between 66 and between 33 was measured after treatment .

根据方程，算出中国人成年男性下颌牙槽弓平均截面积为12.15cm~2。

The total area of the alveolar region of Chinese adult male mandibles is 12.15 cm ~ 2 in average .

与同期对照组下颌牙弓宽度的改变相比，也具有显著差异（P<0.001）。

The width of mandibular arch in the treated subjects increased more than that in the controls ( P < 0.001 ) .

目的观察活动舌弓+再曲簧临床扩弓效果，寻找一种简便、有效，尤其对下颌牙弓更理想的扩弓方法。

Objective Observe the clinical effect of removable lingual arch plus auxiliary spring for convenient dental ( especially mandibular ) arch expansion .

中国人成年男性下颌牙槽弓的形态观测及其几何图形的数学显示公式

A study of the inferior alveolar arch in Chinese male adults with special reference to its geometrical configuration deduced by a polynomial curvilinear regression equation

目的：应用扩大上/下颌牙弓和Ⅱ类牵引方法矫治成人安氏Ⅱ类2分类错牙合，观察并比较矫治前后硬组织X线头影测量以及模型的变化。

Objective : To study the effects of treatment of Angle ⅱ division 2 malocclusion with upper / lower arch expansion and Class ⅱ elastics in adults .

对上、下颌牙槽弓进行了测量、分析，得出以下初步结果：1.国人牙槽弓的指数在成人分别为：上颌：118.2，下颌：77.6。

The results from the observation of the adult specimens are as follows : The indices of alveolar arches are about 118.2 in maxilla ; 77.6 in mandible .

结果超声测量浅层嚼肌横截面的周长、面积、横径、平均厚度、最大厚度对下颌牙弓磨牙区宽度影响明显，且成负相关；

The indices included perimeter , area , width , average thickness , maximal thickness of cross-sectional area and length of the vertical-sectional area of the masseter muscle .

其中上颌扩弓者9例，下颌扩弓者8例，随机分为两组，分别采用活动舌弓+再曲簧和四眼簧进行扩弓，比较两组的扩弓效果。

The patients were divided to two groups at random for arch expansion with removable lingual arch plus auxiliary spring and with Quad-helix , respectively , and the effect of arch expansion was compared between the two groups .

上颌全腭导板对下颌牙弓宽度的影响研究结论在儿童颌面部生长发育高峰期，唇挡可有效促进下颌牙弓生长发育，改善面下部硬软组织侧貌形态。

The effect of the improved maxillary biteplate on the width of mandibular arch Conclusion The lip bumper could play an important role in the mandibular arch development and lower facial profile improvement in mixed and early permanent dentition .

结论：除了下颌前部牙弓宽度变窄外，严重深覆牙合型AngleⅡ2错牙合牙弓形态基本正常。

Conclusion : The dental arch form in the Angle ⅱ 2 deep-overbite patients might be characterized as normal except in the mandibular intercanine width dimension , which is reduced .

另有8%的下颌缘支弓状行于下颌骨下缘下方1cm范围内。

In addition , 8 % marginal mandibular branch laid arched blow the inferior margin of mandible within 1 cm .

目的探讨戴用上颌全腭导板对下颌牙列牙弓宽度的影响。

Objective : To study the effect of the improved maxillary bite plate on the width of mandibular arch .

结论在儿童颌面部生长发育期间，下颌唇挡有助于增加下颌牙弓的长度与宽度，对治疗替牙期及恒牙初期下颌牙弓轻度或中度拥挤产生积极作用。

Conclusion The lip bumper can promote mandibular arch development and increase lower arch perimeter in the mixed and . early permanent dentition .

骨性Ⅲ类错拾上下颌牙齿都向能够使上下颌牙弓协调的方向代偿性倾斜，同时牙弓与其对应基骨弓之间的协调性降低。

Upper and lower teeth could inclinate towards the direction for better interarch coordination , as the same time , coordination between dental arch and the corresponding basal bone arch was reduced .

目的研究下颌唇挡对替牙期及恒牙初期儿童下颌牙弓及下颌骨生长发育的影响，探索用下颌唇挡早期矫治下颌牙列拥挤的作用机理。

Objective To evaluate the effects of lip bumper therapy on the changes of the mandibular arch in the mixed and early permanent dentition .