If the brush is furcated or evaginable, it needs to be replaced in case of damaging the tooth-ridge.
如刷毛分叉、外翻应及时更换，以免损伤孩子的齿龈。
Objective:To investigate the effect of implantation of particulate hydroxylapatite artificial bone after tooth extraction on resorption of the alveolar ridge.
目的：研究羟基磷灰石微粒人工骨对拔牙后牙槽骨吸收的疗效及并发症。
Serious tooth defect which involved cuspid, incisal Angle, marginal ridge and occlusal surface can't be filled and need occlusal reconstruction.
各种严重的牙体缺损已涉及牙尖、切角、边缘嵴以及合面，需要咬合重建而不能使用一般充填修复者。
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