Table 6.

Mean and standard deviation of ridge width (8 mm) at different follow-up periods

Ridge width (8 mm)	OD group		expanders group		Difference	95% CI	P value
	Mean	SD	Mean	SD
Preoperative	7.88b	1.34	7.34ab	0.97	−0.54	−1.57 to 0.50	0.2942
Baseline	9.35a	1.44	7.93a	0.64	−1.42	−2.41 to −0.43	0.0072*
3 months	9.26a	1.43	7.50b	0.74	−1.76	−2.82 to −0.68	0.0029*
6 months	8.85ab	1.53	7.19b	0.77	−1.66	−2.85 to −0.45	0.0096*
P value	<0.001*		<0.001*

Means that do not share a letter vertically are significantly different