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

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Sami K Al-Joubori
Mohammed Nahidh


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 having Class I dental and skeletal patterns with normal occlusion and severe crowding. The sample was divided into two groups according to the severity of crowding into: group I had Class I normal occlusion with mild or no crowded mandibular dentition and group II had Class I malocclusion with severe crowded mandibular dentition. Each group comprising of 40 subjects (20 males and 20 females). The mesio-distal and facio-lingual crown diameters were measured manually for each cast using modified vernier caliper gauge. Descriptive statistics were obtained for the measurements for both genders; independent samples t-test was performed to evaluate the gender difference in each 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. Neither facio-lingual dimension nor the tooth shape ratio has significant influence of the mandibular incisor arrangement and the mesio-distal dimension is the most important factor.

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How to Cite
Al-Joubori, S. and Nahidh, M. (1) “The effect of tooth shape ratio on mandibular incisors arrangement in Iraqi adult subjects ”, Journal of Baghdad College of Dentistry, 25(Special Is), pp. 132-136. Available at: (Accessed: 16February2020).
Orthodontics, Pedodontics and Preventive Dentistry

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