The effect of divergency on the transverse relationship
Werbitt, Jonathan Andrew
MetadataShow full item record
INTRODUCTION: The aim of this study was to determine if there is a correlation between divergency, age, and the transverse width of the maxilla and mandible at the first molar level, as well as the angulation of the 1st molar teeth. MATERIALS AND METHODS: CBCT images of 94 patients between the ages of 12-62 were selected randomly and concurrently for this retrospective study. Patients were grouped into hypo-, normo- and hyperdivergent groups with Frankfort horizontal to the mandibular plane angle (FMA) <20.5, ≥22-≤28, >29.5 degrees respectively. RESULTS: The hypodivergent group’s maxilla was on average 1.6 mm wider than that of the hyperdivergent group (p ≤ 0.05). The inclination of the right first maxillary molar showed a R2 value of 0.165 for age alone (p-value = 0.000023), while the inclination of the left first maxillary molar had a R2 value of 0.136 (p-value = 0.003) for both divergency and age. The correlations between hyperdivergent, normodivergent, and hypodivergent groups and the inclinations of the upper molars were R2= 0.13, 0.19, and -0.13 respectively. CONCLUSIONS: Our study agreed with the literature in that hyperdivergent patients have palatal widths that are narrower than in hypodivergent patients. We saw a positive correlation between age and molar angulations for all ages and divergences except in the left maxillary first molar of the hypodivergent patients where we saw a negative correlation.