Abstract
Purpose : This study aimed to clarify the correlation between implant insertion torque (IT value) and implant stability quotient (ISQ value) for different types of bone quality and drill protocols.
Methods : The IT value and ISQ value were measured in two experimental groups, one in which the same implant socket was formed in each simulated bone assuming various bone qualities and the other in which a different implant socket was formed in the simulated bone of the same bone quality.
Results : In the experimental group in which the same implant socket was formed in each simulated bone assuming various bone qualities, the correlation coefficient between the IT value and the ISQ value was 0.67, showing a positive correlation. In addition, the correlation coefficient when limited to IT values of 35 Ncm or less showed a strong positive correlation of 0.81, and the correlation coefficient when limited to IT values of 45 Ncm or more showed a positive correlation. Among the experimental groups in which different implant sockets were formed in the simulated bone of the same bone quality, the correlation coefficients between the IT value and ISQ value of the D2-3 and D2 groups were 0.67 and 0.03, respectively ; the former showed a positive correlation, and the latter showed no correlation. In addition, the correlation coefficient when limited to IT values of 35 Ncm or less showed a strong positive correlation of 0.71, and the correlation coefficient when limited to IT values of 45 Ncm or more showed a negative correlation.
Conclusion : Higher IT values provide higher primary stability for the same implant socket with different bone quality. However, it was suggested that the primary stability decreases in the case of an implant socket with an IT value of 45 Ncm or more, such as when bone density is high and excessive adaptation techniques are used.
