References Extraction location Preservation method Difference
(experimental vs control, mm) 		Control group Period observation
Lekovic et al. [12] Anterior and premolar teeth Control group: blood clot External vertical measurement:
3.19/2.81 vs 3.31/1.81 		16 6 months
Test group: sockets grafted with bovine bone mineral and covered with bioabsorbable membrane made of glycolide and lactide polymers Internal vertical measurement:
6.88/1.06 vs 6.94/3
Horizontal measurement:
7.38/6.06 vs 7.5/2.94