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Umm Al-Qura University Faculty of Dentistry
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تكون الأسنان اللبنية وبيان موعد ظهور كلا من الأسنان اللبنية والدائمة
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متى يبدأ تكوّن الأسنان؟
1.
جامعة أم القرى
كلية طب الأسنان
2.
متى يبدأ تكوّن
الأسنان؟ Dr.HetafSameerRedwan
3.
تكَوُّن الأسنان يبدأ
تكون جميع الأسنان اللبنية في الشهر الثاني أو الثالث من تكون الجنين داخل الرحم.
4.
بينما الأسنان الدائمة
يبدأ تكونها في الشهر السابع من تكون الجنين.
5.
ظهور الأسنان اللبنية
عند بلوغ الطفل شهره السادس من العمر تظهر أول الأسنان اللبنية وهي القواطع الأمامية السفلية.
6.
ثم تتبعها القواطع
الأمامية العلوية وتستمر في الظهور حتى سن الثالثة.
7.
حيث تكتمل الأسنان
اللبنية ويكون عددها 20 سناً. وتختلف سرعة ظهورها من طفل لآخر.
8.
9.
ظهور الأسنان الدائمة
أول ضرس دائم يظهر عند الأطفال عند 6 سنوات. و تستمر الأسنان الدائمة في الظهور إلى سن 12-13 سنة.
10.
باستثناء ضروس العقل
فإنها تظهر مابين 17-25 سنة. حيث يكتمل عدد الأسنان 32 سناً..