Changes in the hyoid bone, tongue, and oropharyngeal airway space after mandibular setback surgery evaluated by cone-beam computed tomography

Maxillofacial Plastic and Reconstructive Surgery

Table 6 Correlations between the amount of mandibular setback and the changes of the variables

Variable	Amount of mandibular setback(ΔB(y))
Variable	Pearson correlation	P value
Hyoid bone position measurements
ΔHb(x)	0.109	0.566
ΔHb(y)	0.410	0.024*
ΔHb(z)	0.505	0.004**
Tongue position measurements
Palatal height	− 0.101	0.597
Intraoral airway volume	− 0.159	0.402
PNS_perp-TT/PNS_perp-U1	0.182	0.337
Airway space measurements
VP volume	− 0.128	0.501
GP volume	− 0.131	0.490
VP MCA	0.027	0.889
GP MCA	− 0.022	0.909
APW at VP	0.054	0.776
TRW at VP	− 0.072	0.703
APW at GP	0.243	0.196
TRW at GP	0.364	0.048*

The Pearson correlation coefficient was calculated to investigate correlations between the amount of mandibular setback and the changes of the hyoid bone, tongue, and oropharyngeal airway space. Amount of mandibular setback meant the change in y coordinate of B-point; ΔB(y). VP velopharynx, GP glossopharynx, MCA minimal cross-sectional area, APW anteroposterior width, TRW transverse width
*P < 0.05; **P < 0.01