Nainar S M, Gnanasundaram N
Department of Pediatric Dentistry, University of Connecticut Health Center, School of Dental Medicine, Farmington 06032.
Angle Orthod. 1989 Winter;59(4):277-82. doi: 10.1043/0003-3219(1989)059<0277:IAEOMD>2.0.CO;2.
In a cross-sectional study of midline diastemas in a South Indian (Madras) population, 9,774 patients aged 13-35 years were screened. True midline diastema was defined as one without periodontal/periapical involvement and with the presence of all anterior teeth in the arch. Sample purification resulted in a research sample of 166 patients with true midline diastemas. The incidence of true maxillary midline diastema (160/9774-1.6%) was greater than that of true mandibular midline diastemas (31/9774-0.3%). No direct etiologic factor for the midline diastemas was noted. Spacing in the anterior region was the most significant factor associated with the midline diastema.
在一项针对南印度（马德拉斯）人群中线牙间隙的横断面研究中，对9774名年龄在13至35岁的患者进行了筛查。真性中线牙间隙被定义为无牙周/根尖周病变且牙弓中所有前牙均存在的情况。样本纯化后得到了166例患有真性中线牙间隙患者的研究样本。真性上颌中线牙间隙的发生率（160/9774 - 1.6%）高于真性下颌中线牙间隙的发生率（31/9774 - 0.3%）。未发现中线牙间隙的直接病因。前部区域的牙间隙是与中线牙间隙相关的最显著因素。
