The effects of alveolar ridge preservation on the delayed implantation

PANG Chao-Yuan; DING Yu-xiang; QIN Rui-feng; HOU Rui; ZHOU Hong-zhi; HU Kai-jin

Abstract：AIM:To evaluate the alveolar ridge preservation on delayed implantation.METHODS:Before tooth extraction 60 patients were divided into group A (with alveolar ridge defect level of 3~5 mm)and group B (with the defect level of more than 5 mm).After single mandibular molar extraction,the patients in group A and B was di-vided into experimental group(AE and BE)and control group(AC and BC)randomly.In group AE and BE the sockets were filled with Bio-Oss and covered with Bio-Gide membrane,in group AC and BC the sockets were without treat-ment.6 months after tooth extraction periodontal pocket depth (PPD),gingival recession level(GRL),clinical gingi-val attachment level (CAL)were measured clinically,alveolar ridge bone volume was measured with CBCT.Then im-plants were inserted into all sockets and followed up for 1 year.RESULTS:There was no statistical difference in PPD, GRL and CAL changes between AE and AC,and between BE and BC.The alveolar ridge bone resorption in AC and BC was more than that in AE and BE (P<0.05)at 6 month-follow-up.A total of 57 implants were inserted,there was no statistical difference in implant stability between AE and AC,and between BE and BC(P>0.05).There was no statistical difference in the peri-implant bone resorption at 1-year-follow-up.CONCLUSION:The alveolar ridge preservation can preserve the alveolar bone volume when the bone defect is more 5 mm.