In fact, it concerns with hard tissues resorption, the removal of collagen from the periodontal ligament and mediated by highly specialized multinucleated cells referred to as odontoclasts.

• 事实上，乳牙的换牙牵涉到硬组织的吸收，牙周组织内胶原纤维的去除，以及相当特殊化的多核破齿细胞来作为媒介。