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ملفات تعريف الارتباط المستخدمة
什麽是年輕恒牙?乳牙脫落後新萌出的恒牙牙根未發育完成,仍處在繼續生長 發育階段,此階段的恒牙稱爲年輕恒牙. 年輕恒牙飾腔大,根管粗,牙本質薄,牙本質小管粗大,所以外 來剌激易波及牙18?年輕恒牙的牙根在萌出3?5年才能完全形 成.年輕恒牙的牙簡組織與乳牙相似,因根尖開口較大,偷腔內血 液供給豐富.發生炎症時感染容易擴散,如及時控制也可能恢複.
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