[Evaluation of 93 cases of mandibular first molar root bifurcation lesions treated with autologous dentin Granules combined with platelet-rich fibrin membrane].

To investigate the efficacy of autologous dentin particles combined with platelet-rich fibrin membrane (PRF) in the treatment of root bifurcation lesions of mandibular first molar.Ninety-three patients (93 teeth) with mandibular first molar root bifurcation lesions were selected from our department from February 2016 to October 2017. They were randomly divided into 2 groups. Forty-six patients with 46 teeth in the experimental group underwent autologous dentin particles combined with platelet-rich fibrin membrane, while patents in the control group (47 patients with 47 teeth) were treated with Bio-Oss implanted in the bone defect area covered with collagen membrane. The patients were revisted at 1, 3, 6 and 12 months after operation. The success rate of the operation group, the depth of periodontal pocket (PD), the loss of attachment (AL), the depth of penetration of the root bifurcation (HPD), and the bone density of the root bifurcation area before and after treatment. The data were recorded and compared with SPSS25.0 software package.The success rate was 97.83%(45/46) in the experimental group, 85.11%(40/47) in the control group, the difference between the two groups was significant(P<0.05). After treatment, PD, AL and HPD decreased significantly (P<0.05), and MGVs increased gradually. There was no significant difference in MGVs before treatment and 1 month after treatment in the experimental group (P>0.05). MGVs at other time points were significantly higher than those of the control group (P<0.05). PD, AL and HPD of the experimental group were lower significantly than the control group at each time point after treatment (P<0.05), and MGVs value was significantly higher than the control group (P<0.05). There was no significant difference in the incidence of complications(4.35% vs 6.38%, χ2=0.189, P>0.05).Autologous dentin particles combined with platelet-rich fibrin membrane is effective for the treatment of root bifurcation lesions of mandibular first molar, which is worthy of wide application.