Are Hyoid Bone and Tongue the Risk Factors Contributing to Postoperative Relapse for Mandibular Prognathism?

Table 3

Linear distances (mm) for the various cephalometric parameters of the serial postsurgical changes.

Linear distance	T2-T1			T3-T2			T4-T3			T4-T1			T4-T2
	Mean	SD		Mean	SD		Mean	SD		Mean	SD		Mean	SD
H-G	−6.5	5.76		−2.4	4.83		1.3	4.28	—	−7.6	5.49		−1.1	5.34	—
H-V	2.3	4.79		−1.8	4.36		−0.2	2.94	—	0.3	3.22	—	−2.0	4.02
Tongue depth	−0.8	6.30	—	−3.2	7.22		2.6	6.12		−1.5	5.58	—	−0.6	5.21	—
Tongue base	−5.4	5.42		−2.7	5.37		0.7	4.70	—	−7.4	6.28		−2.0	5.98	—

: significant, .
—: not significant.
T2-T1: postsurgical immediate change; T3-T2: difference between postsurgical immediate change and 6 weeks to 3 months’ change.
T4-T3: change between postsurgical 6 weeks to 3 months and over 1 year.
T4-T1: over 1 year final surgical change; T4-T2: over 1 year surgical stability.