恒牙萌出于6岁左右，开始于第一恒磨牙以及下颌第一中切牙。这个过程一直持续到将近21岁。
Permanent teeth begin appearing around age 6, starting with the first molars and lower central incisors. This process continues until approximately age 21.
尖牙改形替代侧切牙是安全可行的。
The procedure of reshaping canines to resemble the missing lateral incisors is safe clinically.
上颌中切牙的短根牙比例相当高。
The rate of short root was high in maxillary central incisors.
上切牙凸度及下前牙牙槽高度均增大。
The protrusion of the upper incisors and the mandibular alveolar height became larger.
目的：研究上颌侧切牙畸形根面沟的外形。
AIM: To study the morphology of deform root groove in the maxillary lateral incisors.
下颌骨的生长方向趋于正常，下切牙略唇倾。
The mandible resumed a normal growth direction, and the lower incisors flared more than normal.
门牙，门齿，切牙。
以上颌中切牙为解剖学基础建立了三维有限元模型。
This paper presents the development of a three dimensional finite element model of central maxillary incisor.
结果得到切牙乳突与腭皱形态的测量方法和基础数据。
Results We gained the basic data and find a measuring method of incisive papilla and palatal wrinkle.
目的探讨用氟保护漆治疗乳切牙早期奶瓶龋的临床效果。
Objective to evaluate the clinical effects of Flour Protector in treatment of teeth with early milk bottle primary caries.
较常见的是尖牙和上颌切牙的埋伏阻生（第三磨牙除外）。
Impacted tooth frequently appears in upper cuspid and upper central incisors(except of the third molar) .
但有资料表明下颌切牙的根管解剖形态较为复杂，变异较多。
However, some research data show that mandibular incisors' root canal anatomy is comparatively complex, and root canal system has many variations.
目的：尝试上颌中切牙贴面计算机辅助设计(CAD)方法。
Objective: To develop a new method of computer aided design (CAD) of veneer on maxillary incisor.
结论：RE主要增加前段牙弓宽度，以中切牙间距离最明显。
Conclusions: RE expanded anterior arch width especially the distance of mid-anterior.
目的研究过量氟对大鼠下切牙发育过程中釉蛋白表达的影响。
Objective To observe the effect of overdose fluoride on the expression of enamelin in rat mandibular incisor.
下颌切牙中，双根管、根管分支和根管分歧都有一定的发生率。
The two root canals, root canal diverge and root canal branch et al have considerable incidence. Besides, mesial-distal root canal walls of mandibular incisor teeth are thin.
目的：研究不同浓度的普洱生茶、熟茶对牛切牙脱矿速率的影响。
Objective: To study the influence of different concentrations of Pu 'er tea, ripe tea on the demineralization rate of bovine incisors.
本研究以上颌中切牙天然牙为解剖学基础建立了三维有限元模型。
A three-dimensional finite element model was built by using central maxillary incisor as its anatomical basis.
计算13种力系统下的上中切牙位移、转动中心及牙周应力分布。
The displacement, the position of the rotation center and the stress distribution of PDL were analyzed under 13 types of loading force system.
是指用工具钢、合金钢制造的滚牙（或切牙）丝锥，精度为H4。
The thread rolling tap is made by tool steel or alloy, the precision is H4.
目的：建立不同垂直骨面型正常牙合人切牙区颌骨形态结构的正常值。
Objective: To establish the cephalometric standards for in ci sal jaw morphology in the subjects with normal occlusion and different vertical facial skeletal types.
我们做了一些预防工作和牙周病治疗，漂白，为左上中切牙做了瓷贴面。
We did a prophylaxis and a little periodontal therapy, bleaching, and a porcelain veneer for the left central incisor.
目的了解正常上颌中切牙牙根不同截面根管周壁厚度及根管面积和形态。
Objective To measure the thickness of the wall of root canal and root canal area in different cross sections of maxillary central incisors.
目的：观察恒切牙外伤冠折后行一次性根管治疗与断冠再接术的临床效果。
Objective To investigate the clinical effect of one-time root canal therapy and reattachment of permanent incisors with crown fracture.
目的探讨正畸关闭间隙法治疗上切牙缺失的适应症，矫治方法及临床效果。
Objective To investigate the indication, treatment methods and effects in cases with missing maxillary incisors by means of orthodontic space closure.
矫治前后摄X线头颅定位侧位片，对切牙位置及硬、软组织进行测量分析。
X-ray cephalometry films were taken before and after treatment, The position of the incisors and sclerous tissues and soft tissues were analyzed.
前方和后方部位具有连续的成釉细胞层，具备切牙颈环的形态和分子特征。
The anterior and posterior aspects maintained the morphological and molecular characteristics of the cervical loop of a continuously growing incisor, with a continuous layer of ameloblasts.
目的：观察用粘结桥、单端固定桥两种方法联合修复上颌侧切牙缺失的临床效果。
Objective: to evaluate a method to restore maxillary lateral incisor with adhesion and cantilever bridge.
结论：安氏II类2分类错牙合与过小侧切牙、釉质发育不良、先天缺牙密切相关。
Conclusion: Angle Class II division 2 malocclusion is closely related to congenital tooth anomalies.
结论：安氏II类2分类错牙合与过小侧切牙、釉质发育不良、先天缺牙密切相关。
Conclusion: Angle Class II division 2 malocclusion is closely related to congenital tooth anomalies.
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