Chang H F, Shiau Y Y, Chen K C
Proc Natl Sci Counc Repub China B. 1986 Oct;10(4):229-35.
This study was undertaken to answer the question, "Are there any differences in the mesiodistal tooth diameters, dental arch width and dental arch depth between the crowded and noncrowded dentitions?" The materials submitted for study consisted of the Orthoscan intraoral occlusograms of 89 subjects with well-aligned dentition and those of 74 subjects with gross dental crowding. The tooth size and arch dimensions were measured from these intraoral occlusograms. The data were subjected to statistical treatment for comparison of noncrowded and crowded groups. The findings in this study lead to the following conclusions: The mesiodistal tooth diameters of the crowded group were significantly larger than those of the noncrowded group. The dental arch widths of the crowded group were significantly smaller than those of the noncrowded group. No substantial or significant difference in dental arch depth between the crowded and noncrowded subjects could be noted. From these findings it seems that tooth size and dental arch width are determining factors in the formation of dental crowding. Clinically, these results suggest that in the treatment of dental crowding, extraction of teeth and/or expansion of dental arches should be considered depending on what is the main causative factor.
本研究旨在回答“牙列拥挤组与非拥挤组在近远中牙直径、牙弓宽度和牙弓深度上是否存在差异？”这一问题。用于研究的材料包括89名牙列排列整齐受试者和74名存在严重牙列拥挤受试者的Orthoscan口腔咬合片。从这些口腔咬合片中测量牙齿大小和牙弓尺寸。对数据进行统计学处理，以比较非拥挤组和拥挤组。本研究结果得出以下结论：拥挤组的近远中牙直径显著大于非拥挤组。拥挤组的牙弓宽度显著小于非拥挤组。未发现拥挤组和非拥挤组在牙弓深度上存在实质性或显著差异。从这些结果来看，牙齿大小和牙弓宽度似乎是牙列拥挤形成的决定因素。临床上，这些结果表明，在牙列拥挤的治疗中，应根据主要致病因素考虑拔牙和/或扩弓。
