Abstract
Frequently, only the mesiodistal dimensions of mandibular posterior teeth have been investigated in relation to lower incisor crowding. The aim of the present study was to investigate any relationship between lower incisor crowding and mesiodistal widths, buccolingual dimensions, occlusal area and occlusal perimeter of mandibular posterior teeth. Mandibular dental casts of 50 Caucasians (25 males and 25 females) were used. Mesiodistal widths, buccolingual dimensions, occlusal area and occlusal perimeter were measured using image analysis techniques. Lower incisor crowding was determined using (1) Little’s irregularity index and (2) anterior-tooth size arch length discrepancy. Using Pearson correlation, the occlusal area, perimeter, mesiodistal widths and buccolingual dimensions of the lower first molar were significantly, positively correlated with Little’s irregularity index. The significant correlation between occlusal area and crowding did not appear to be secondary to larger mesiodistal widths.
Highlights
Only the mesiodistal dimensions of mandibular posterior teeth have been investigated in relation to lower incisor crowding
The anterior tooth size-arch length discrepancy (ATSALD) was measured as the difference between the sum of the individual mesiodistal widths of the four lower incisors and the dental arch length, using the image analysis method
The results show that area of posterior teeth is an important variable when investigating lower incisor crowding
Summary
Only the mesiodistal dimensions of mandibular posterior teeth have been investigated in relation to lower incisor crowding. The aim of the present study was to investigate any relationship between lower incisor crowding and mesiodistal widths, buccolingual dimensions, occlusal area and occlusal perimeter of mandibular posterior teeth. Using Pearson correlation, the occlusal area, perimeter, mesiodistal widths and buccolingual dimensions of the lower first molar were significantly, positively correlated with Little’s irregularity index. Studies of lower incisor crowding and posterior tooth morphology have been limited to measuring only the mesiodistal width. The aim of this study was to investigate the relationship between lower incisor crowding and the occlusal surface area, buccolingual and mesiodistal dimensions of mandibular posterior teeth
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