Rotational resistance of surface-treated mini-implants

Area of Science:

• Biomaterials Science
• Orthodontic Materials
• Dental Implantology

Background:

• Mini-implants are crucial for orthodontic anchorage.
• Surface treatments influence implant stability and osseointegration.
• Comparing sandblasted and acid-etched (SLA) versus machined surfaces is essential for clinical application.

Purpose of the Study:

• To evaluate the stability and resistance to rotational moments of early-loaded SLA mini-implants versus machined mini-implants.
• To test the hypothesis of no difference in rotational stability between SLA and machined mini-implants.

Main Methods:

• A randomized complete block design study was conducted on 96 mini-implants in 12 beagle dogs.
• Two types of mini-implants were used: sandblasted and acid-etched (SLA) and machined surfaces.
• Rotational moments were applied after 3 weeks of healing, and success rates, torque values, angular momentum, and energy absorbed were analyzed.

Main Results:

• Sandblasted and acid-etched (SLA) mini-implants exhibited significantly lower maximum insertion torque and angular momentum compared to machined implants.
• SLA mini-implants showed significantly higher total removal energy than machined implants.
• No significant differences were found in total insertion energy, maximum removal torque, or removal angular momentum between the two groups.

Conclusions:

• Sandblasted and acid-etched (SLA) mini-implants demonstrate distinct mechanical properties compared to machined implants post-insertion.
• The findings suggest enhanced osseointegration of SLA mini-implants, indicated by higher removal energy.
• Surface treatment significantly impacts the early stability and osseointegration of orthodontic mini-implants.