The crown-root morphology of central incisors in different skeletal malocclusions assessed with cone-beam computed tomography

Progress in Orthodontics

Table 4 Collum angle/labial surface angle of central incisors among different vertical skeletal malocclusions (°)

	Low angle		Average angle		High angle		ANOVA P value	Scheffe’s test
	Number	Mean ± SD	Number	Mean ± SD	Number	Mean ± SD	ANOVA P value	L-A	L-H	A-H
Maxillary CA	21	0.94 ± 6.71	24	−1.02 ± 6.30	21	1.74 ± 5.28	0.915	0.974	0.916	0.981
Maxillary LSA	21	14.91 ± 4.76	24	14.44 ± 4.06	21	14.69 ± 4.29	0.347	0.503	0.986	0.416
Mandibular CA	21	3.13 ± 6.32	24	0.40 ± 5.80	21	1.25 ± 6.58	0.609	0.911	0.611	0.846
Mandibular LSA	21	13.94 ± 4.01	24	11.32 ± 3.91	21	11.73 ± 3.98	0.217	0.751	0.219	0.589