Discussion : Effects of implant thread design on primary stability (5)
The question of placement speed warrants further consideration. Indeed, another advantage of double-threaded implants is placement speed. The implantation speed of 06D was twice that of 06S, and implantation was completed twice as fast. Nevertheless, while plastic bottles and emergency valves have double-threaded screws for faster opening and closing, the effect of placement speed for dental implants on initial stability parameters, such as torque and ISQ values, has not been investigated and remains unknown. It was also interesting that the debris generated with 06D were larger than those generated with 06S, despite higher placement speed. Implant design is the same as that of industrial screws with multiple threads that are mass-produced. This is required because the lead angle is large and the installation speed is fast. Multithreading allows for a lower number of rotations, so even if the installation speed is reduced, the implant is embedded faster compared with a single thread. The issue of placement speed on initial stability warrants further investigation.
Interestingly, not all surfaces of the implant body and implant cavity were in tight contact with each other, and gaps and bone fragments were observed in some portions. Although gaps are unlikely to be beneficial for initial implant stability, bone fragments are thought to be beneficial for bone union. However, it is unclear how the size and number of debris affect bone union. The present study found that different thread designs are associated with different sizes and numbers of debris, but how this affects bone union remains to be addressed.
Serial posts:
- Effects of implant thread design on primary stability—a comparison between single- and double-threaded implants in an artificial bone model
- Effects of implant thread design on primary stability (1)
- Effects of implant thread design on primary stability (2)
- Methods : Effects of implant thread design on primary stability
- Results : Effects of implant thread design on primary stability
- Discussion : Effects of implant thread design on primary stability (1)
- Discussion : Effects of implant thread design on primary stability (2)
- Discussion : Effects of implant thread design on primary stability (3)
- Discussion : Effects of implant thread design on primary stability (4)
- Discussion : Effects of implant thread design on primary stability (5)
- Table 1 Dimensions of implants
- Table 2 Insertion torque (IT), removal torque (RT), and ISQ values
- Figure 1. Implant code 12S is similar to a commercially available standard
- Figure 2. Insertion torque (IT), removal torque (RT), and implant stability quotient (ISQ)
- Figure 4. Torque kinetics
- Figure 5. Microscopic analysis of contact interfaces.
- Figure 6. Bone debris at the contact interfaces.