Postoperative changes in the pharyngeal airway space through computed tomography evaluation after mandibular setback surgery in skeletal class III patients: 1-year follow-up

Maxillofacial Plastic and Reconstructive Surgery

Table 6 Comparison of the amount of changes between group 1 (BSSRO) and group 2 (BSSRO + Le Fort I osteotomy)

Variable		T0–T1		T1–T2		T2–T3		T0–T3
Variable		Average of change	P value	Average of change	P value	Average of change	P value	Average of change	P value
ΔNph AP (mm)	Group 1	0.96	0.422	− 0.21	0.284	0.12	0.549	0.87	0.756
ΔNph AP (mm)	Group 2	0.45	0.422	0.51	0.284	− 0.31	0.549	0.66	0.756
ΔOph Ap (mm)	Group 1	2.25	0.668	− 0.15	0.306	− 0.92	0.221	1.18	0.333
ΔOph Ap (mm)	Group 2	1.44	0.668	0.96	0.306	− 3.61	0.221	− 1.20	0.333
ΔHph AP (mm)	Group 1	1.76	0.025^*	0.63	0.568	− 1.37	0.078	1.03	0.225
ΔHph AP (mm)	Group 2	− 0.82	0.025^*	0.14	0.568	0.30	0.078	− 0.40	0.225
ΔNph vol (cm³)	Group 1	0.33	0.392	0.24	0.409	0.11	0.008^**	0.69	0.116
ΔNph vol (cm³)	Group 2	0.84	0.392	− 0.14	0.409	− 1.04	0.008^**	− 0.33	0.116
ΔOph vol (cm³)	Group 1	1.80	0.500	− 0.21	0.049^*	0.37	0.004^**	1.95	0.003^**
ΔOph vol (cm³)	Group 2	1.26	0.500	0.88	0.049^*	− 1.85	0.004^**	0.29	0.003^**
ΔHph vol (cm³)	Group 1	1.86	0.011^*	0.01	0.094	− 0.11	0.293	1.76	0.093
ΔHph vol (cm³)	Group 2	− 0.21	0.011^*	1.32	0.094	− 0.74	0.293	0.38	0.093
ΔWhole pharynx volume (cm³)	Group 1	3.99	0.246	0.01	0.141	0.37	0.004^**	4.40	0.023^*
ΔWhole pharynx volume (cm³)	Group 2	1.89	0.246	2.06	0.141	− 3.62	0.004^**	0.34	0.023^*

Independent t-test was performed
^*Significant at p < 0.05, ^**Significant at p < 0.01
BSSRO bilateral sagittal split ramus osteotomy, T0 before surgery, T1 2 months after surgery, T2 6 months after surgery, T3 1 year after surgery, Nph AP anteroposterior distance of nasopharynx, Oph AP anteroposterior distance of oropharynx, Hph AP anteroposterior distance of hypopharynx, Nph vol nasopharynx volume, Oph vol oropharynx volume, Hph vol hypopharynx volume