School of Dentistry, College of Dentistry, China Medical University, Taichung, Taiwan; Department of Pediatric Dentistry, China Medical University Hospital, Taichung, Taiwan.
Institute of Biostatistics, China Medical University, Taichung, Taiwan.
J Formos Med Assoc. 2018 Jul;117(7):598-604. doi: 10.1016/j.jfma.2017.07.010. Epub 2017 Aug 12.
BACKGROUND/PURPOSE: Spaced primary dentition plays a critical role in the eruption of permanent teeth and the establishment of ideal occlusion. A lack of these spaces in deciduous dentition may result in disproportionate jaw and tooth sizes. Additionally, spaced primary dentition is significantly affected by ethnic factors. However, few of these studies have been conducted in Asia. The purpose of this study was to investigate the prevalence of spaced primary dentition in Taiwan.
One hundred and forty-seven 3- to 6-year-old Taiwanese children (58 girls and 89 boys) were recruited for a cross-sectional study. Primate and interdental spaces were recorded by intraoral photos. The prevalence of spaced dentition was evaluated. The interpersonal agreement of spaced dentition between the upper and lower arches was also assessed.
Most of the subjects had spaced primary dentition. The prevalence of primate space was 83.7% in the upper arch and 61.2% in the lower arch, whereas the prevalence of interdental space was 44.2% in the upper arch and 53.1% in the lower arch. The prevalence rates of interdental space and upper primate space were significantly higher in boys than in girls. Interdental spaces of the lower arch increased with age.
Ethnic factors can affect the ratio of spaced dentition. Most of the 3- to 6-year-old Taiwanese children have spaced dentition. The boys have higher incidence of spaced dentition than the girls. Furthermore, primate space is more frequently found in the upper arch than in the lower arch, whereas interdental space is reversed.
背景/目的：乳牙间隙在恒牙萌出和理想咬合建立中起着关键作用。乳牙缺失这些间隙可能导致颌骨和牙齿大小不成比例。此外，乳牙间隙受种族因素影响显著。然而，这些研究在亚洲开展较少。本研究旨在调查台湾地区乳牙间隙的流行情况。
采用横断面研究，共招募 147 名 3 至 6 岁的台湾儿童（58 名女孩和 89 名男孩）。通过口腔内照片记录灵长类动物间隙和牙间隙。评估乳牙间隙的流行情况。还评估了上下颌牙弓之间乳牙间隙的人际一致性。
大多数受试者存在乳牙间隙。上颌的灵长类动物间隙发生率为 83.7%，下颌为 61.2%；上颌的牙间隙发生率为 44.2%，下颌为 53.1%。男孩的牙间隙和上颌灵长类动物间隙发生率显著高于女孩。下颌牙弓的牙间隙随年龄增长而增加。
种族因素会影响乳牙间隙的比例。大多数 3 至 6 岁的台湾儿童存在乳牙间隙。男孩的乳牙间隙发生率高于女孩。此外，上颌的灵长类动物间隙比下颌更常见，而牙间隙则相反。
