SUMMARY Pregnancy-related pelvic ring disease brings great suffering to pregnant women, including the separation of the pubic symphysis and sacroiliac joint pain.Hormonal changes leading to ligamentous laxity is the main reason for pregnancy-related pelvic ring disease.In normal pregnant cases, and the physiologic widening at the symphysis is about 3-7 mm.When the widening of the symphysis is more than 10 mm, it may lead to symptoms and need active treatment.Currently the diagnosis of the pubic symphysis separation is based on the clinical symptoms and signs.The treatment of acute pubic symphysis separation bases on conservative therapy, includes bed rest and physical therapy.But when the widening of the symphysis is more than 4 cm, the surgery intervention may be a good treatment.If the conservative treatment is not obviously effective, the surgery consists of plate fixation in the pubic symphysis and sac-roiliac screw fixation.Other indications for the surgical intervention include inadequate reduction, recur-rent diastasis, intractable symptoms, and open rupture.

Objective:To study the effects of metformin on marginal bone resorption of implants in patients with type 2 diabetes melli-tus(T2DM)and exercise habit.Methods:63 cases with 73 implants were included.Among them,there were 41 cases(47 implants)without T2DM in group N,10 cases(13 implants)with T2DM and without exercise habit in group M,12 cases(12 implants)with T2DM and exercise habit in the MR group.The patients were followed up at 6 months,1 and 2 years after implantation.The marginal bone loss(MBL).Implantation success rate and peri-implantitis incidence rate were compared among the groups.Results:The bone resorption of the proximal and median margins of the long-term bone level of the implants in the N and MR groups were significantly lower than that in the M group(P=0.001 and P=0.000 5,respectively).The implant success rates of group N,MR and M were 95.74％,100％and 76.92％,respectively.The incidence of peri-implantitis of the three groups was 2.13％,0 and 15.38％,respec-tively.Conclusion:Metformin is more effective in the improvement of the long-term marginal bone resorption of implants,increase the success rate of implants,and reduce the incidence of peri-implantitis in patients with T2DM and exercise habit in the mandibular first molar area.