The trial with 40 consecutive patients in need of tooth extraction had two groups.
- The extraction sockets of the 20 patients in the control group were left to spontaneous healing.
- The extraction sockets of the 20 patients in the test group were filled with Geistlich Bio-Oss® Collagen, covered by a Geistlich Bio-Gide® membrane.
After 6 months, bone height was measured radiographically. Those patients who had chosen implant therapy (14 in each group) received an 8 mm implant if bone height was enough. If not, crestal or lateral sinus lift was carried out.
This is what the authors found out:
- Six out of 14 patients in the “Ridge Preservation” group could receive implants without additional measures (7 patients: crestal sinus lift, 1 patient: lateral sinus lift)
- All patients in the “spontaneous healing” group needed sinus floor elevation (10 patients: crestal sinus lift, 4 patients: lateral sinus lift)
- 0.14 mm of sinus pneumatization in the “Ridge Preservation” group
- 1.16 mm of sinus pneumatization in the “spontaneous healing” group
The authors conclude
"Alveolar ridge preservation in the posterior maxilla maintained the vertical bone height more efficiently and resulted in less need for sinus augmentation procedures at 6 months compared to spontaneous healing. […] Based on these findings, ARP would be strategically recommended to clinicians with the object of decreasing the invasiveness and complexity of implant treatment in the maxillary posterior area."