Resistance to immediate orthodontic loading of surface-treated mini-implants

Area of Science:

• Orthodontics
• Biomaterials Science
• Dental Implantology

Background:

• Immediate loading of orthodontic mini-implants is a common clinical practice.
• Surface treatment of mini-implants may influence their stability and resistance to forces.
• Sandblasted and acid-etched (SAE) surfaces are compared against traditional machined surfaces.

Purpose of the Study:

• To compare the stability and resistance to orthodontic forces of immediately loaded SAE mini-implants versus machined-surface mini-implants.
• To test the hypothesis of no difference in stability between the two surface treatments under immediate loading conditions.

Main Methods:

• 44 rabbits received SAE and machined-surface mini-implants in their tibiae.
• Immediate orthodontic loading (150 g) was applied post-placement.
• Success rates and maximum removal torque values (RTVs) were measured at various time points up to 10 weeks.

Main Results:

• Thirteen mini-implants failed during the study period.
• SAE mini-implants exhibited significantly higher RTVs compared to machined mini-implants.
• No significant difference in RTVs was found between loaded and unloaded mini-implants.

Conclusions:

• The hypothesis was supported, as both SAE and machined mini-implants demonstrated similar success rates with immediate loading.
• SAE mini-implants provided higher RTVs, indicating potentially superior retention and stability.
• SAE surface treatment may offer enhanced stability for immediate orthodontic loading compared to machined surfaces.