Abstract
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.
Highlights
General speaking, excessively large teeth, excessively small bony base of the jaw or a combination of large teeth and small jaw dental are considered as multifactorial causes for dental crowding [1]
Lavelle et al [8] evaluated the effect various ethnic groups on occlusion of subjects. They showed that dental arch width did not play a significant role in differentiating between various ethnic groups while arch length was effective. They reported that the mesiodistal dimensions of the teeth which vary among different ethnic groups Merz et al [9] found in their sample that 51 black patients have larger dental arch dimensions compared to 50 white patients
Frist group was with normal occlusion Second group was with class I anterior dental crowding For first group the following criteria were adopted: 1 They have Class I molar relationship 2 Normal overjet and overbite (2-4 mm) 3 They have no supernumerary, fracture teeth and posterior or anterior crossbite 4 They haven’t any abnormal habits such as thumb sucking, tongue thrust, pencil biting and so on. 5 No massive caries and/or massive restorations 6 They haven’t any history of orthodontics and surgical treatments 7 No midline sifting in normal occlusion They second group were adopted to have the same criteria but with maxillary dental crowding more than 4 mm
Summary
Excessively large teeth, excessively small bony base of the jaw or a combination of large teeth and small jaw dental are considered as multifactorial causes for dental crowding [1]. Lavelle et al [8] evaluated the effect various ethnic groups on occlusion of subjects They showed that dental arch width did not play a significant role in differentiating between various ethnic groups while arch length was effective. They reported that the mesiodistal dimensions of the teeth which vary among different ethnic groups Merz et al [9] found in their sample that 51 black patients have larger dental arch dimensions compared to 50 white patients. They noticed that the dental arches of the black patients were significantly wider and deeper.
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