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

Table 2

Values for the various cephalometric parameters of the serial postsurgical changes in the vertical direction.

Variable (mm)	T2-T1			T3-T2			T4-T3			T4-T1			T4-T2
	Mean	SD		Mean	SD		Mean	SD		Mean	SD		Mean	SD
Me	1.6	5.24	—	−0.4	3.82	—	−1.5	7.33	—	−0.3	5.62	—	−1.9	6.75	—
G	1.9	3.94		−1.9	4.31		−1.2	7.27	—	−1.2	5.48	—	−3.1	5.87
H	10.7	5.79		−8.8	4.48		−0.2	8.84	—	1.7	7.97	—	−9.0	8.52
Tm	−2.3	4.67		0.7	5.30	—	−2.4	6.77		−4.0	5.90		−1.7	5.69	—
V	6.0	5.32		−5.1	5.36		0.0	8.19	—	0.9	7.01	—	−5.1	7.50

(+) means the downward movement; (−) means the upward movement.
: 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.