Matrix Metalloproteinase-8 Levels in Peri-Miniscrew Crevicular Fluid During Immediate and Delayed Orthodontic...

Area of Science:

• Orthodontics
• Biomaterials
• Periodontology

Background:

• Orthodontic miniscrews are widely used for anchorage.
• Understanding the biologic response to immediate versus delayed loading is crucial for clinical success.
• Matrix metalloproteinase-8 (MMP-8) is a key enzyme in tissue remodeling and inflammation.

Purpose of the Study:

• To compare matrix metalloproteinase-8 (MMP-8) levels in peri-miniscrew implant crevicular fluid (PMCF) between immediate-loaded and delayed-loaded orthodontic miniscrews.
• To evaluate MMP-8 levels at various time points following loading to assess biologic response to mechanical stress.

Main Methods:

• A split-mouth design was used with 15 patients receiving bilateral maxillary miniscrews.
• One side was immediately loaded, while the contralateral side was loaded 8 days post-placement.
• PMCF was collected and analyzed for MMP-8 levels using enzyme-linked immunosorbent assay (ELISA).

Main Results:

• No statistically significant difference in MMP-8 levels was observed between immediate-loaded and delayed-loaded miniscrew groups.
• A significant decrease in MMP-8 levels was noted on the delayed-loaded side from 24 hours post-placement to 28 days post-loading.
• MMP-8 levels showed initial increases followed by gradual reduction in both groups, suggesting bone adaptation.

Conclusions:

• Immediate loading of orthodontic miniscrews does not significantly alter MMP-8 levels compared to delayed loading.
• The biologic response to mechanical stress appears similar between immediate and delayed loading protocols.
• Observed MMP-8 fluctuations likely reflect the bone's adaptation process to applied forces.