Determination the dental arch dimensions in human populations is necessary for various fields of dental sciences. This study was designed to evaluate the maxillary dental arch dimensions of Yemeni children aged (10-12) years. The sample was gathered from primary and intermediate school in Sana'a city, Yemen. Clinical examination was performed on 200 subjects (100 males and 100 females) that fulfillment the criteria of this study. The examination was carried out for subjects that have either normal occlusion or class I with anterior dental crowding. Pairs of studying models for the dental arch was constructed and evaluated by special software for digitizing and analyzing the data. This study reported that class I with anterior dental crowding is still high incidence, particularly for females, in Yemeni Population. Therefore, more prevention protocols and dental health educational programs about orthodontics needs are essential in Yemen.
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