本文调查研究了在5个年龄组中不同性别和种族成年人的上颌中线间隙发生率。材料与方法随机抽样检查了5970件全景X线片,以确定上颌中线间隙的存在。研究对象限于上颌前牙完整,无正畸治疗史,上颌前牙无修复体者。记录被检者的年龄、性别和种族。将间隙分组如下: 1.无间 This study investigated the prevalence of maxillary median space among adults of different genders and races in five age groups. Materials and Methods 5970 panoramic radiographs were randomly sampled to determine the presence of maxillary midline space. Subjects were limited to the integrity of the maxillary anterior teeth, no history of orthodontic treatment, maxillary anterior teeth without prosthesis. Record the subject's age, gender and race. Gaps are grouped as follows: 1. In-between