Comparison of mandibular cross-sectional morphology between Class I and Class II subjects with different vertical patterns: based on CBCT images and statistical shape analysis

Table 7 Comparison of ratio between upper 1/3 and lower 1/3 of mandibular width

Gender	Ratio	Class I normodivergent	Class I hyperdivergent	Class I hypodivergent	Class II normodivergent	Class II hyperdivergent	Class II hypodivergent	Comparison
Male	11	0.57 ± 0.08	0.55 ± 0.07	0.62 ± 0.07	0.62 ± 0.09	0.60 ± 0.08	0.67 ± 0.06	2L > 2H**
	23	0.81 ± 0.09	0.81 ± 0.11	0.82 ± 0.09	0.85 ± 0.13	0.86 ± 0.14	0.88 ± 0.06	NS
	45	1.06 ± 0.14	1.08 ± 0.22	1.12 ± 0.12	1.11 ± 0.13	1.19 ± 0.31	1.19 ± 0.11	NS
	67	1.16 ± 0.10	1.13 ± 0.09	1.19 ± 0.07	1.23 ± 0.11	1.25 ± 0.09	1.21 ± 0.03	2H > 1H**
	Comparison	11 < 23 < 45* 45 < 67	11 < 23 < 45*** 45 = 67	11 < 23 < 45*** 45 = 67	11 < 23 < 45* 45 < 67	11 < 23 < 45*** 45 = 67	11 < 23 < 45*** 45 = 67
Female	11	0.59 ± 0.06	0.55 ± 0.07	0.64 ± 0.08	0.61 ± 0.07	0.56 ± 0.08	0.67 ± 0.08	2L > 2H*, 1L > 1H*
	23	0.79 ± 0.08	0.76 ± 0.09	0.86 ± 0.09	0.81 ± 0.08	0.74 ± 0.10	0.88 ± 0.09	2L > 2H*, 1L > 1H
	45	1.01 ± 0.12	0.97 ± 0.15	1.12 ± 0.14	1.03 ± 0.16	0.96 ± 0.11	1.13 ± 0.08	2L > 2H, 1L > 1H
	67	1.18 ± 0.10	1.13 ± 0.10	1.20 ± 0.12	1.18 ± 0.10	1.18 ± 0.09	1.21 ± 0.09	NS
	Comparison	11 < 23 < 45 < 67***	11 < 23 < 45 < 67***	11 < 23 < 45*** 45 < 67*	11 < 23 < 45 < 67***	11 < 23 < 45 < 67***	11 < 23 < 45*** 45 = 67

1A: Class I normodivergent group; 1L: Class I hypodivergent group; 1H: Class I hyperdivergent group;
2A: Class II normodivergent group; 2L: Class II hypodivergent group; 2H: Class II hyperdivergent group
^*P < 0.05, **P < 0.01, ***P < 0.001; NS: Not significant

ISSN: 1472-6831