Table 4.

Bone mineral density (in grams per square centimeter, g/cm²)

Groups	Mean ± SD	p
Untreated	0.37 ± 0.03
Allograft	0.80 ± 0.09	0.000a
BOX hydrogel	0.41 ± 0.05	0.140
BOX hydrogel + 5 μg/ml BMP-2	0.61 ± 0.06	0.001a
BOX hydrogel + 10 μg/ml BMP-2	0.73 ± 0.05	0.000a
BOX hydrogel + 20 μg/ml BMP-2	0.90 ± 0.08	0.000a

^acompared to the untreated group