RESUMEN
Congenital absence of permanent teeth has direct clinical implications. The present study describes the differences between tooth size, arch depth, and width, overjet and overbite in cases with bilateral congenitally missed laterals [BCML] and normal subject. Twenty-two female subjects with BCML aged from 13:18 years compared with 22 female subjects, with normal occlusion and complete permanent dentition [except the third molar], and matching in age. The results revealed that cases with BCML have reduced crown size more anteriorly than posteriorly, reduced arch width and depth which is more pronounced at the canine region, and decreased overbite and overjet. These findings are of importance for orthodontic treatment planning patients with BCML
RESUMEN
Supernumerary teeth [SNT] are those that are in excess of normal complement and mimic the normal shape. They are influenced by genetic and environmental factors and contribute to the variability of permanent tooth size
Objective: To investigate if the presence of supernumerary teeth has an effect on crown size of the dentition
Methods: The Supernumerary group consisted of 60 subjects [35 males and 25 females] and the control group of 40 subjects [20 males and 20 females]. All available permanent teeth on the dental casts were imaged and measured from both buccal and occlusal views using an image analysis system. Mesido-distal, bucco-lingual or occluso-gingival dimensions, area and perimeter were measured from each view
Results: Supernumerary tooth patients tended to have larger tooth size measurements for almost all variables than controls, significant difference [p<0.05] were found for most of tooth size dimensions with some evidence of a local effect with greater difference in tooth dimension adjacent to the site of the Supernumeraries
Conclusion: The results are compatible with SNT being a complex dental anomaly with multifactorial etiology in which both genetic and environmental factors are important