Effects of implant thread design on primary stability-a comparison between single- and double-threaded implants in an...

Area of Science:

• Dental Implantology
• Biomaterials Science
• Osseointegration Research

Background:

• Primary implant stability is crucial for successful osseointegration.
• Enhancing stability without increasing implant size necessitates design modifications.
• Strategies include extending thread length via reduced pitch, double-threaded designs, or altered pitch/lead and lead angles.

Purpose of the Study:

• To evaluate the effect of modified thread designs on dental implant primary stability.
• To compare the stability and bone tissue response of single-threaded and double-threaded implants with reduced pitch/lead.

Main Methods:

• Tested three implant configurations on artificial bone: a control 1.2-mm pitch single-threaded implant (12S), a 0.6-mm pitch/1.2-mm-lead double-threaded implant (06D), and a 0.6-mm pitch/lead single-threaded implant (06S).
• Assessed stability using insertion torque, removal torque, and implant stability quotient (ISQ).
• Evaluated bone tissue damage via microscopy and morphometric analysis.

Main Results:

• Both 06D and 06S demonstrated significantly improved stability compared to the 12S control.
• The 06S implant exhibited significantly greater stability than the 06D, except for ISQ measurements.
• All implants caused bone tissue damage (debris, voids); 06D induced the most damage, followed by 06S, then 12S.

Conclusions:

• Modifying implant thread design, specifically reducing pitch/lead and lead angle, significantly enhances primary stability.
• Single-threaded implants with optimized pitch/lead offer superior stability compared to double-threaded designs.
• While stability is improved, careful consideration of potential bone tissue damage is warranted with modified thread designs.