Synergistic Effect of Tooth Extraction Socket Characteristics on Implant Selection and Implant Torque

CHEN Gang; WANG Shufeng; ZHAO Xin; SUN Binbin; PENG Linyu; YANG Zhicheng

doi:10.3969/j.issn.2096-305X.2026.01.008

Abstract：Objective To explore the correlations between the key characteristics of the tooth extraction socket(shape,healing time,root tip depth)and the selection of implant shape as well as the implant torque,in order to provide evidence-based medical evidence for personalized implant treatment plans.Methods A retrospective study design was adopted,and 132 cases of single tooth extraction followed by implant restoration were included.The shape and root apex depth of the extraction socket were precisely measured using CBCT,and the shape of the implant and the actual implant torque data were extracted from the surgical records.Variance analysis,chi-square test,and multiple linear regression models were used to systematically analyze the association strength and statistical significance between the characteristics of the extraction socket and the selection of implant shape as well as the implant torque.Results The proportion of choosing conical implants for irregular-shaped extraction sockets(68.20%)was significantly higher than that for circular extraction sockets(23.50%);the implant torque in the delayed implant group(3 months or more after extraction)was(21.3±3.5)(N·cm),which was significantly higher than that in the immediate implant group(12.6±2.8)(N·cm);multivariate linear regression analysis showed that for every 1 mm increase in root apex depth,the average implant torque increased by 1.2(N·cm).Conclusion The shape of the extraction socket,the healing time,and the root tip depth are the core key factors influencing the selection of implant shape and the implant torque.Among them,the irregular-shaped extraction socket is more suitable for conical implants.Extending the healing time and increasing the root tip depth can significantly enhance the implant torque.