Skeletal and Dentofacial Features in Schoolchildren with Isolated Maxillary Lateral Incisor Agenesis (MLIA)

Purpose: The objective of this study is to investigate the characteristic skeletal and dentofacial morphological features of patients with isolated bilateral or unilateral congenital absence of maxillary lateral incisors in three dimensions through comparing them with non-hypodontia control group. Material and Methods: The sample of the study will be comprised of "63" school students, males and females within an age range (12–15) years, who had permanent dentition and affected by isolated bilateral or unilateral congenital absence of upper lateral incisors, excluding third molars, in order to measure some of traditionally used parameters and to be compared with non-hypodontia control sample. The significance test for the differences in dimensions between hypodontia and non-hypodontia subjects was performed using Student t-test. Results: Both of the angles ANB and the inclination of the occlusal plane to SN were significantly reduced in the patients compared with that of the controls; p < .05. The length of premaxilla in the MLIA group was shorter compared with that of the control group; p <.05. Moreover, this parameter was more noticeably reduced in the subjects of the bilateral agenesis subgroup (BMLIA) compared with those of the control sample; p < .05. Conclusions: This study concluded that the influence of MLIA appears exclusively in the 'external complex', which consists of: The anterior frontal part of the cranial base, ANS and premaxilla and the development of these parts decreases along with diminished upper lateral incisor-number.


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