99MTc-diphosphonate bone imaging and uptake in healing rat extraction sockets

Area of Science:

• Oral and Maxillofacial Surgery
• Nuclear Medicine
• Biomedical Imaging

Background:

• Clinically positive bone scans in the jaw can stem from various benign dental issues.
• Understanding the temporal dynamics of bone scan activity post-dental extraction is crucial for accurate interpretation.

Purpose of the Study:

• To develop an experimental model for assessing radionuclide imaging and uptake in rat jaws following dental extraction.
• To correlate experimental findings with clinical observations in human patients.

Main Methods:

• A standardized mandibular first molar extraction model was used in rats.
• Sequential technetium-99m diphosphonate (99mTc-DP) bone scans and radionuclide uptake measurements were performed.
• Histological and radiographic analyses were conducted for comparison.

Main Results:

• Positive bone scans were observed in rats between 4 and 16 days post-extraction.
• Elevated radionuclide uptake in healing extraction sites persisted for 4 to 42 days.
• Conventional radiography and histology did not reveal significant changes in extraction socket bone architecture during these periods.

Conclusions:

• The rat model successfully demonstrated positive bone scans and increased radionuclide uptake following dental extraction.
• Findings suggest that positive bone scans after dental procedures in humans may persist for an extended duration, potentially months.