特别是在下颌第一恒磨牙。
目的：了解上颌第一恒磨牙牙体解剖基础知识。
Objective: to study the anatomy of the maxillary first permanent molars.
第二恒磨牙龋与第一恒磨牙龋构成比随年龄增长而上升。
The composition ratio of first and second permanent molars caries increased with the age increasing.
结果保存修复的成功率下颌第一恒磨牙为94％，第二恒磨牙为67％。
Results The successful rate of conservative prosthetics was 94% in the first mandibular molars, while 67% in the second molars.
目的调查分析广东省青少年第一恒磨牙患龋情况，为防治对策提供依据。
Objective Based on the report of epidemiological investigation of oral Realth in Guandong in 1995.
比较树脂型和高粉液比玻璃离子封闭剂窝沟封闭对第一恒磨牙的防龋效果。
Objective - To compare the caries prevention effect of resin and glass ionomer cement sealant.
在本文中，我们描述了自体补充臼齿以取代提取第一恒磨牙在12岁的男孩。
In this article, we describe the autotransplantation of a supplemental premolar to replace an extracted first permanent molar in a 12-year-old boy.
目的：评价手术显微镜用于探寻上颌第一恒磨牙mb 2根管口的诊断价值。
PURPOSE: To estimate the diagnostic potential of the dental operating microscope use for locating MB2 orifice in maxillary first molars.
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.
女性患龋率高于男性，7 ~12岁第一恒磨牙患龋率随年龄增长明显升高，12岁后患龋率上升变化较为平缓。
The caries rate increased rapidly with aging from 7 to 12. After 12 the caries rate increased slowly.
女性患龋率高于男性，7 ~12岁第一恒磨牙患龋率随年龄增长明显升高，12岁后患龋率上升变化较为平缓。
The caries rate increased rapidly with aging from 7 to 12. After 12 the caries rate increased slowly.
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