Abstract:

Objective To study the clinical influencing factors of the torque loss value of implant abutment screw and explore theappropriate timing to prevent abutment screw loosening. Methods Patients who visited Implant Department of Changzhou Stomatological Hospital for examination after implantation from December 2019 to June 2023 were collected, and relevant clinical factors were measured and recorded, including patients’ gender, tooth position, implant diameter, the specification of abutment screw, the number of co-supported implants and bridges, the ratio of loading, loading time of the crown, torque loss value of abutment screw. The Person correlation analysis was performed to filter out independent variables that were highly correlated with the torque loss value of the central screw, and the linear regression analysis was performed. Results This study collected a total of 125 implants from 73 patients. According to Person correlation analysis and multiple linear regression analysis, implant crown load days had a significant impact on the central screw torque attenuation value(r=0.616, P<0.001), while the other independent variables had no significant correlation(P>0.05). The regression model was statistically significant(R²=0.475, P<0.001). Conclusion The loading days of Osstem standard implant can significantly predict the torque loss value of the abutment screw under normal load.

Key words: oral implant, abutment screw, torque loss