Table II.

RT-qPCR analysis of RANKL/OPG expression in midpalatal expansion (mean ± SD).

Group	RANKL	OPG	RANKL/OPG ratio
NC	1.20±0.12a	1.59±0.56	1.12±0.52
Exp	1.03±0.32a	0.48±0.26	2.04±0.75
EaT	0.00±0.00	0.31±0.19	0.02±0.01
ExR	0.69±0.28a	0.41±0.23	2.89±1.00
EtR	0.29±0.13	1.24±0.70	0.99±0.58

^aP<0.05 compared with the EaT group.

RT-qPCR, reverse transcription-quantitative polymerase chain reaction; RANKL, receptor activator of nuclear factor κB ligand; OPG, osteoprotegerin; NC, non-expansion control; Exp, expansion; EaT, expansion and transplantation; ExR, expansion and relapse; EtR, expansion, transplantation and relapse.