Evaluation of the infrazygomatic crest and mandibular buccal shelf in different sagittal skeletal patterns: a cone-beam computed tomography study

Figures & Tables

	Class II	Class I	Class III			post-hoc p-value
Variables	mean ± sd	mean ± sd	mean ± sd	p-value	I-II	II-III	I-III
Age	30.08 ± 5.9	26.46 ± 6.1	26.21 ± 5.3	0.18
			Sex
Female	28 (90.3 %)	24 (85.7 %)	22 (84.6 %)	0.63
Male	3 (9.6 %)	4 (14.2 %)	4 (15.3 %)
			Upper Third Molar
Present	20	18	16	0.72
Absent	11	10	10
			Lower Third Molar
Present	18	16	20	0.81
Absent	13	12	6
SNA°	82.7 ± 4.6	82.8 ± 5.6	79.3 ± 3.4	0.09
SNB°	75.8 ± 4.6	80.6 ± 5.9	83.3 ± 3.5	0.001	0.04	0.001	NS
ANB°	6.8 ± 2.4	2.1 ± 1.1	-4 ± 3.5	<0.001	<0.001	<0.001	<0.001
SN-GoMe°	35.2 ± 7.5	31.2 ± 4.4	32.5 ± 5.5	0.26

	M1mr (I)	M1dr (II)	M2mr (III)	M2dr (IV)		post hoc pvalue
Class II	mean ± sd	mean ± sd	mean ± sd	mean ± sd	p-value	I-II	I-III	I-IV	II-III	II-IV	III-IV
					IZC (mm)
Total thickness at 70°	2.5 ± 1.5	2.6 ± 1.5	2.2 ± 1.3	2.4 ±1.5	0.85
					MBS (mm)
Total thickness at 6 mm	4.2 ± 3.2	5 ± 3.4	6.5 ± 2.2	7.5 ±2.3	<0.001	NS	0.04	0.001	NS	0.01	NS
Total thickness at 11 mm	5.2 ± 2.9	6.3 ± 3.1	7.2 ± 1.9	8 ±2.2	0.002	NS	0.04	0.002	NS	NS	NS
Total height at 4 mm	18.4 ±7.1	19.9 ± 6.5	22.7 ± 2.9	23.8 ±2.9	0.002	NS	0.03	0.003	NS	NS	NS
Total height at 6 mm	14.6 ±7.4	16.5 ± 6.4	20.4 ± 3.6	22.1 ±3.7	<0.001	NS	0.003	<0.001	NS	0.005	NS
					Class I
					IZC (mm)
Total thickness at 70°	3.5 ± 1.9	3.2 ± 1.7	3.3 ± 1.8	3.71 ±1.9	0.75
					MBS (mm)
Total thickness at 6 mm	2.6 ± 2	4 ± 3.1	5.8 ± 2.3	7.2 ±2.3	<0.001	NS	<0.001	<0.001	0.04	<0.001	NS
Total thickness at 11 mm	4.2 ± 2.6	6 ± 2.5	6.6 ± 2.4	7.4 ±2.4	<0.001	0.03	0.002	<0.001	NS	NS	NS
Total height at 4 mm	17.7 ±9.7	20 ± 7.7	19.8 ± 7.3	20.9 ±6.1	0.46
Total height at 6 mm	15.3 ±9.4	17.2 ± 8.5	17.6 ± 8.1	19 ±7.6	0.4
					Class III
					IZC (mm)
Total thickness at 70°	3 ± 2.1	2.9 ± 1.9	3 ± 1.5	3.3 ± 1.9	0.89
					MBS (mm)
Total thickness at 6 mm	2.8 ± 2	4.4 ± 2.4	7.1 ±1.9	8.5 ± 2	<0.001	0.03	<0.001	<0.001	<0.001	<0.001	NS
Total thickness at 11 mm	5 ± 2.6	6.7 ± 1.8	7.9 ± 1.6	8.6 ± 1.9	<0.001	0.01	<0.001	<0.001	NS	0.004	NS
Total height at 4 mm	17 ± 5.1	19.6 ±4	20.1 ± 3.1	20.4 ± 2.9	0.007	NS	0.02	0.01	NS	NS	NS
Total height at 6 mm	13.1 ± 6.7	17 ± 5.1	17.9 ± 3.9	19.7 ± 3.8	<0.001	0.02	0.003	<0.001	NS	NS	NS

	SNA		SNB		Maxillary Length		Mandibular Length
	r	p-Value	r	p-Value	r	p-Value	r	p-Value
	M1mr
Total thickness at 70°	0.070	0.66	0.048	0.76	-0.186	0.24	0.238	0.13
Total thickness at 6 mm	0.202	0.2	-0.034	0.83	0.295	0.06	0.207	0.19
Total thickness at 11 mm	0.301	0.05	0.328	0.03	0.212	0.18	0.331	0.03
Total height at 4 mm	0.174	0.27	0.140	0.38	0.124	0.44	0.440	0.004
Total height at 6 mm	0.284	0.07	0.246	0.12	0.220	0.16	0.357	0.02
	M1dr
Total thickness at 70°	0.032	0.84	0.035	0.83	-0.120	0.45	0.267	0.09
Total thickness at 6 mm	0.131	0.41	0.031	0.84	0.164	0.3	0.268	0.09
Total thickness at 11 mm	0.293	0.06	0.346	0.02	0.030	0.85	0.375	0.01
Total height at 4 mm	0.028	0.86	0.059	0.71	0.018	0.90	0.504	0.001
Total height at 6 mm	0.139	0.38	0.211	0.18	0.087	0.58	0.450	0.003
	M2mr
Total thickness at 70°	-0.088	0.58	0.089	0.57	-0.001	0.99	0.210	0.08
Total thickness at 6 mm	0.189	0.23	0.358	0.02	-0.059	0.71	0.508	0.001
Total thickness at 11 mm	0.085	0.59	0.358	0.02	-0.023	0.88	0.346	0.02
Total height at 4 mm	0.059	0.71	-0.092	0.56	0.155	0.33	0.384	0.01
Total height at 6 mm	0.089	0.57	0.002	0.99	0.124	0.44	0.508	0.001
	M2dr
Total thickness at 70°	-0.190	0.23	-0.044	0.78	-0.069	0.66	0.233	0.14
Total thickness at 6 mm	0.042	0.79	0.355	0.02	-0.043	0.79	0.523	<0.001
Total thickness at 11 mm	0.150	0.34	0.281	0.07	0.051	0.73	0.431	0.005
Total height at 4 mm	0.035	0.82	-0.208	0.19	0.132	0.41	0.293	0.03
Total height at 6 mm	-0.012	0.94	-0.115	0.47	0.081	0.61	0.430	0.005