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

Table 1

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

Variable (mm)	T2-T1			T3-T2			T4-T3			T4-T1			T4-T2
	Mean	SD		Mean	SD		Mean	SD		Mean	SD		Mean	SD
Me	−12.8	4.60		−3.3	5.29		3.1	5.44		−12.9	4.36		−0.1	4.20	—
G	−13.0	6.68		−2.8	4.64		2.7	4.81		−13.1	6.11		−0.1	3.87	—
H	−4.9	7.30		−1.5	7.61	—	1.7	7.23	—	−4.8	5.32		0.2	6.27	—
Tm	−4.6	3.86		0.6	3.34	—	−1.0	3.50	—	−5.0	4.44		−0.4	2.84	—
V	−5.8	7.07		0.4	6.39	—	0.4	6.15	—	−4.9	4.59		0.8	6.69	—

(+) means the forward movement; (−) means the backward 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.