Effects of implant thread design on primary stability
Effects of implant thread design on primary stability—a comparison between single- and double-threaded implants in an artificial bone model
Abstract
Background
Primary implant stability is essential for osseointegration. To increase stability without changing the implant size, the thread length must be extended by reducing pitch, using a double-threaded implant, or reducing pitch/lead and lead angle to half that of a single-threaded implant.
Materials and methods
We tested the stabilities of these configurations using artificial bone. A 1.2-mm pitch, single-threaded implant (12S) was the control. We tested a 0.6-mm pitch/1.2-mm-lead double-threaded implant (06D) and a 0.6-mm pitch/lead single-threaded implant (06S). We compared stabilities by measuring insertion torque, removal torque, and the implant stability quotient (ISQ). Damage to bone tissue caused by the implants was evaluated using microscopy and morphometric analysis.
Results
We show that 06D and 06S significantly improved stability compared with the 12S reference. The stability of 06S was significantly greater compared with that of 06D, except for ISQ. The three implants were associated with bone tissue damage characterized by debris and voids surrounding the implant/bone interface. The 06D caused the most tissue damage, followed by 06S and then 12S.
Conclusion
These findings indicate that primary stability was significantly improved by changing the implant size, extending the thread length with reduced pitch/lead, and reducing the lead angle to half that of a single-threaded implant compared with a double-threaded implant.
Serial posts:
- Effects of implant thread design on primary stability
- Introduction : Effects of implant thread design on primary stability
- 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)
- References : Effects of implant thread design on primary stability
- Figure 1. Implant code 12S
- Figure 2. Insertion torque (IT), removal torque (RT), and implant stability quotient (ISQ)
- Figure 3. Comparison between IT and RT
- Figure 4. Torque kinetics. Immediately after insertion terminated, the implant was removed using the same load and rotation speed. Torque kinetics were measured during implant insertion (top) and removal (bottom)
- Figure 5. Microscopic analysis of contact interfaces
- Figure 6. Bone debris at the contact interfaces
- Table 1 Dimensions of implants
- Table 2 Insertion torque (IT), removal torque (RT), and ISQ values