【单选题】【消耗次数：1】
牙受到温和而持续的正畸力时，在压力侧牙周组织将（）
①
牙周膜纤维拉伸变长，牙周膜间隙增宽
②
血管充血，血流加速
③
成纤维细胞增殖，成骨细胞分化，胶原纤维和基质增生
④
牙槽骨面出现一薄层呈淡红色的类骨质
⑤
分化出破骨细胞，胶原纤维和基质降解吸收，牙槽骨吸收
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相关题目
【单选题】
根据Cawood & Howell牙槽骨分类，Ⅳ类牙槽骨指的是（）
①
天然牙存在时的牙槽骨
②
天然牙刚拔除的牙槽骨
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刃状牙槽嵴，高度充分、宽度不足
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平坦的牙槽嵴，高度、宽度都不足
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凹陷的牙槽嵴，下颌体有吸收迹象
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