【单选题】【消耗次数：1】
牙齿萌出前营养障碍导致牙齿矿化度低，釉质发育不全，牙齿可能出现的现象不包括（）
①
牙齿颜色改变，成棕色
②
牙面可见平行横线
③
切缘变厚
④
牙齿可有带状、窝状凹陷
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牙齿萌出各项中正确的是
①
早萌乳牙牙根已经形成不易脱落
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婴儿牙槽嵴上的“马牙子”应尽快去除
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诞生牙的牙根尚未形成应早拨除
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诞生牙多是多生牙
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牙齿过早萌出应尽快拨除
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牙胚由牙板及邻近的外胚间充质发育而来
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帽状期成釉器细胞分化为三层
③
多根牙的形成是由上皮隔的发育所决定的
④
最早形成的牙体组织为釉基质
⑤
牙胚是在成釉器的帽状期形成的
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