【名词&注释】
维生素(vitamin)、营养不良(malnutrition)、前成骨细胞(preosteoblast)、全口义齿(complete denture)、牙发育(tooth development)、成骨细胞分化(osteoblast differentiation)、牙萌出(tooth eruption)、釉质发育不全(enamel hypoplasia)、自凝树脂(self-solidification resin)
[单选题]釉质发育不全(enamel hypoplasia)是因为 ( )
A. 牙萌出(tooth eruption)后患儿缺钙所致
B. 牙发育期间,全身或局部因素所致
C. 牙萌出(tooth eruption)后患儿高热所致
D. 牙萌出(tooth eruption)后患儿缺少维生素所致
E. 牙萌出(tooth eruption)后患儿营养不良所致