Abstract：
Diastema between the teeth negatively affects the patients\' smile, psychology and daily activities by creating a disharmony in the patients\' face. The development of diastema has been attributed to several factors such as labial frenulum, microdontia, mesiodens, peg-shaped lateral incisors, agenesis, cysts, habits such as finger sucking, tongue thrusting, or lip sucking, dental malformations, genetics, proclinations, dental-skeletal discrepancies, and imperfect coalescence of interdental septum. Patients often present with complex problems that require a multidisciplinary treatment approach which includes determination of the aetiological factors, soft tissue morphology, occlusion, patient demands and aesthetic consideration to achieve satisfactory outcomes. Lack of current literature on classification of diastemas and multi-disciplinary approach of management led to the proposal of a new classification the ATAC (Anatomic and Therapeutic Classification) for management of the diastema. This case report highlights the use of the proposed classification for management of diastemas, requiring a perio-restorative intervention using a Chu\'s proportion gauge to achieve ideal aesthetics.
摘要：
牙齿之间的粘连会对患者的微笑产生负面影响，心理和日常活动，通过在患者脸上制造不和谐。舒张的发展归因于几个因素，如唇系带，microdontia,mesiodens,钉形侧切牙，发育不良,囊肿,比如吸吮手指的习惯,舌头刺痛，或者吸唇，牙齿畸形,遗传学,proclinations,牙齿-骨骼差异，和齿间隔的不完美聚结。患者通常会出现复杂的问题，需要采用多学科治疗方法，包括确定病因。软组织形态学,遮挡,患者的需求和美学考虑，以实现满意的结果。由于缺乏有关纵隔分类和多学科管理方法的现有文献，因此提出了一种新的分类方法ATAC（解剖和治疗分类）来管理纵隔。本案例报告重点介绍了使用拟议的分类法来管理纵隔，需要使用Chu的比例尺进行周期恢复性干预，以获得理想的美学。
