The effect of tooth shape ratio on mandibular incisors arrangement in Iraqi adult subjects

Abstract

Background: This study aimed to assess the effect of tooth shape ratio on mandibular incisor arrangement.Materials and methods: The sample included dental casts of some dental students and orthodontic patients havingClass I dental and skeletal patterns with normal occlusion and severe crowding. The sample was divided into twogroups according to the severity of crowding into: group I had Class I normal occlusion with mild or no crowdedmandibular dentition and group II had Class I malocclusion with severe crowded mandibular dentition. Each groupcomprising of 40 subjects (20 males and 20 females). The mesio-distal and facio-lingual crown diameters weremeasured manually for each cast using modified vernier caliper gauge. Descriptive statistics were obtained for themeasurements for both genders; independent samples t-test was performed to evaluate the gender difference ineach group and to evaluate the groups' difference in total sample.Results and Conclusions: The results showed that there is non-significant genders difference in both groups. Generally,the mesio-distal and facio-lingual dimensions were higher in severely crowded mandibular incisor group. Neitherfacio-lingual dimension nor the tooth shape ratio has significant influence of the mandibular incisor arrangement andthe mesio-distal dimension is the most important factor