Ridge Preservation for Implant Therapy: a Review of the Literature

Table 1: Treatment modalities and expected dimensional changes.

	Control Sites (No Treatment)	Bone Graft Only	Membrane Only	Combined Bone Graft + Membrane
Horizontal bone changes	-2.51 mm Range: 0.16 – 4.5 mm (loss)	-1.18 mm Range: 0.75 – 2.0 mm (loss)	-0.08 mm Range: 0.1 (loss) – 2.90 mm (gain)	+0.47 mm (gain) Range: 3.48 (loss) – 3.27 mm (gain)
Vertical bone changes	-2.07 mm Range: 0.8 – 5.24 mm (loss)	-1.31 mm Range: 0.48 – 2.48 mm (loss)	+0.14 mm (gain) Range: 0.38 (loss) – 1.30 mm (gain)	-0.15 mm Range: 0.02 (loss) – 1.3 mm (gain)
Percentage of vital bone	42.4% Range: 25.7 – 54.0%	46.2% Range: 32.4 – 59.5%	N.A.	31.7% Range: 28 – 35.5%

Results are averages found from multiple studies using several different materials with follow-up of 4 – 6 months healing. N.A. = no studies available. Control sites are all extraction without augmentation (Data compiled from 14 studies in systematic reviews)