Abstract: Objective: Good therapeutic results were obtained by retreament and fixation of upper anterior tooth with incorrect diaplasis in other hospitals. Diagnosis and treatment: This paper reported a patient with upper anterior teeth trauma with incorrect diaplasis in other hospital. Based on the patient's medical history and findings of the clinical examinations and imaging examinations, the final diagnosis was obtained.The affected teeth were re-diaplasis and fixed which with the perfect root canal treatment.Finally, the satisfied clinical results were achieved. Results: A follow-up examination was performed 3、12、and 24 months after the treatment. Clinical examination found no obvious periodontal pockets, tooth discoloration, nor swelling of the gums around affected teeth. The radiographic images obtained during the follow-up examination showed that the periodontal lesions and root resorption images were gradually healed. Conclusions: The correct diagnosis, timely and correct treatment and follow-up are crucial to achieve a good prognosis of dental trauma.

Key words: dental trauma, lateral luxation, alveolar fracture, root resorption, root canal teratment