最新牙的发育及萌出特点【精品-PPT】【精品-PPT】【精品-PPT】【精品-PPT】【精品-PPT】教学讲义PPT.ppt

《最新牙的发育及萌出特点【精品-PPT】【精品-PPT】【精品-PPT】【精品-PPT】【精品-PPT】教学讲义PPT.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、牙的发育及萌出特点【精品-PPT】【精品-PPT】【精品-PPT】【精品-PPT】【精品-PPT】牙的发育及萌出特点牙的发育过程分为发育、钙化、萌出三个阶段牙胚：由来自外胚叶的成釉器和中胚叶的乳突状结缔组织构成，形成牙滤泡。(图)牙胚破龈而出的现象称出龈出龈至咬合接触的全过程叫萌出萌出时间是指出龈时间萌出的生理特点是：牙的萌出有明确的时间和顺序；在一定时间内，按一定顺序左右成对的萌出；一般情况下，下颌早于上颌，女性早于男性.乳牙的萌出胚胎2月发生，5-6月钙化，新生婴儿颌骨内有20个牙胚约生后半年萌出,30个月（两岁半）完成顺序：IIIIVIIIVBacke0VHt

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