Comparison of Crown-Root Relationships of Maxillary Central Incisors in Various Malocclusions
Received: 26 November 2018
Accepted after revision: 07 February 2019
04 April 2019 (eFirst)
Objective The purpose of this study is to compare the crown-root and labial crown-root angles in class I, class II division (div) 1, and class II div 2 malocclusions, using cephalometric radiographs, and to find a correlation between crown-root angulation and labial crown-root angle.
Materials and Methods A sample of 45 patients (23 females and 22 males) with age range from 11 to 27 years and mean age of 17 years was taken. The sample was divided into class I, class II div 2, and class II div 1 malocclusions with 15 patients in each group. The means for various parameters for each group were calculated, and multiple comparisons were made. For correlation of two parameters, Pearson's correlation was used for normally distributed data.
Results Mean crown-root angle for class I was 5.8 ± 6.5; for class II div 1, it was 5.3 ± 4.2; and for class II div 2, it was 15.6 ± 9.69 degrees. Mean labial crown root angle for class I was 28.8 ± 5.8; for class II div 1, it was 27.06 ± 4.9; and for class II div 2, it was 39.8 ± 9.8 degrees.
Conclusions Statistically higher values were seen for crown-root angle and labial crown-root angle in class II div 2 malocclusion. A significant correlation was seen between crown-root angle and labial crown-root angle in class I, class II div 1, and class II div 2 malocclusion.
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