关键词: 年轻恒牙, 牙齿固连, 替代性吸收, 截冠术

Abstract: Tooth ankylosis or replacement resorption is a common complication secondary to severe tooth trauma. For immature permanent teeth，traumatic tooth ankylosis may result in infraposition of ankylosed tooth，arrestment of local alveolar bone development，tipping of adjacent teeth，irregular dental arch and loss of arch length，which may influence the patient aesthetically as well as the permanent restoration in the future. At present，there is still no ideal way to prevent or control this process，and decoronation is considered as the best method to treat traumatic tooth ankylosis of immature permanent teeth. This paper reviewed studies concerning the clinical manifestations，mechanisms，factors related to progression，and therapies of traumatic ankylosis of immature permanent teeth in recent years，so as to provide reference for relevant clinical researches.

Key words: immature permanent teeth, tooth ankylosis, replacement resorption, decoronation