Abstract
BackgroundAnterior crowding/ spacing are one of the major problems that inspire patients to undergo orthodontic treatment. Several factors associated with anterior crowding/ spacing includes arch width and length, mesio-distal tooth diameter and proportions. The aim of the present study was to evaluate the relationship of maxillary and mandibular base lengths to the amount of anterior dental crowding/ spacing in patients with complete class II malocclusions.Material and MethodsA retrospective study was done with 152 patients who were divided into four groups according to the severity of pre-treatment dental crowding/spacing present in the mandibular arch. Measurements were performed on the pre-treatment dental casts and lateral cephalograms. Statistical analysis was done using t-test and chi-square test.ResultsSubjects with complete class II malocclusion and moderate to severe mandibular crowding [≥3mm] have significantly smaller base lengths as compared to the subjects with slight crowding or spacing [<3mm].ConclusionsThere exists an inverse correlation between maxillary and mandibular base lengths and the severity of dental crowding and direct correlation with spacing. Key words:Apical base lengths, Class II malocclusion, Crowding, Incisor inclination, Spacing.
Highlights
Anterior crowding is one of the most common problems that motivate patients to seek orthodontic treatment
In yet another study conducted by Lundstrom, where he examined twenty-five pairs of twins to study the changes in incisor inclination between 12 to 15 years and 23 to 26 years, it was found that the age changes for spacing/crowding were correlated with neither change in incisor inclination nor growth direction of the mandible [1,2]
A weak to moderate inverse correlation was found between the amount of dental crowding and maxillary and mandibular base lengths
Summary
Anterior crowding is one of the most common problems that motivate patients to seek orthodontic treatment. Many factors have been evaluated and found to be related to anterior dental crowding, including dental arch width and length, mesio-distal tooth diameter and dental proportions [1]. The association between dental crowding and tooth size has been studied previously, conclusions remain discrepant. Several factors associated with anterior crowding/ spacing includes arch width and length, mesio-distal tooth diameter and proportions. The aim of the present study was to evaluate the relationship of maxillary and mandibular base lengths to the amount of anterior dental crowding/ spacing in patients with complete class II malocclusions. Material and Methods: A retrospective study was done with 152 patients who were divided into four groups according to the severity of pre-treatment dental crowding/spacing present in the mandibular arch. Conclusions: There exists an inverse correlation between maxillary and mandibular base lengths and the severity of dental crowding and direct correlation with spacing
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