To investigate the malocclusion of lower second molars

Objective:To investigate factors related to the malocclusion of lower second molars.Method:Position of lower second molars and the width of mandibular alveolar arch at the second molar level were recorded and space analysis on mandibular posterior segment of each subject were performed.Data was analyzed with software SAS8.12.Result:Logistic regression revealed significant correlation in width of lower alveolar arch at the lower second molar level between the patients with and without malocclusion of the lower second molar(P0.01),However,no significant correlation were established in posterior space deficiency(P0.05).Conclusion:The malposition of the lower second molars was not correlated with the posterior segment discrepancy while it did tend to occur more frequently in the patients with narrower alveolar arch width at the second molar level.