Effects of Bone Mineral Density,Maximum Torque Value and Stability Coefficient on Implant Stability of Patients with Absence of Teeth Undergoing Implant Restoration

JIANG Bingkun; NING Huiying

doi:10.3969/j.issn.1002-3429.2024.11.017

Abstract：Objective To analyze the effects of bone mineral density(BMD)and maximum torque value on implant stability in patients with absence of teeth undergoing implant restoration.Methods A total of 304 implant sites were selected from 80 patients with absence of teeth undergoing implant restoration from September 2021 to February 2023.Cone-beam CT was used to measure maxillofacial bone density and the thickness of surrounding alveolar bone in the implant area.The implant insertion torque value(ITV)was measured by the implant machine,and the implant stability coefficient(ISQ)was measured by the implant stability measuring instrument.Bone resorption at the edge of each implant was measured by X-ray imaging soft-ware.BMD,ITV and ISQ values of different implant areas and bone mass were compared,and the correlation of BMD with ITV and ISQ values was analyzed.Based on the condition of the implant at three months after surgery,the implants were divided in-to stable group and unstable group.Clinical data,BMD,ITV and ISQ values of the two groups were analyzed,and multivariate Logistic regression analysis was performed to analyze the influencing factors of implant stability.Results BMD in different planting areas was compared,which was the highest in mandibular anterior teeth,followed by mandibular posterior teeth,max-illary anterior teeth and maxillary posterior teeth(P<0.05).Comparison of ISQ value and ITV in different planting areas showed the highest value in mandibular posterior teeth,followed by mandibular anterior teeth,maxillary posterior teeth and maxillary anterior teeth(P<0.05).BMD,ISQ value and ITV in mandibular region were significantly higher than those in maxil-lary region(P<0.05).The BMD,ISQ value and ITV of different bone mass were compared,showing the highest value in Class Ⅰ bone,followed by Class Ⅱ bone,class Ⅲ bone and Class Ⅳ bone(P<0.05).BMD was positively correlated with both ITV and ISQ values(r=0.801,0.783,P<0.05),and ITV was positively correlated with ISQ values(r=0.771,P<0.05).BMD,ITV and ISQ values in unstable group were lower than those in stable group(P<0.01).BMD,ITV and ISQ were the factors affecting implant stability(P<0.01).Conclusion BMD in different planting areas and ITV of patients with absence of teeth undergoing implant restoration were positively correlated with implant stability.In addition,implant stability was also affected by implant diameter,bone quality and planting area.