Purpose: Absolute anchorage has been a critical aspect in orthodontics. Quantity and quality is a critical factor MSI placement. The present study was designed using a spiral computed tomography to assess the bone availability and clinically assess the optimized position and site for MSI placement in the posterior region.
Material And Methods: Spiral computed tomography images often patients were obtained with requirement of MSI placement. Mesiodistal inter-radicular distance in the posterior region of the maxilla over narrowest inter-radicular space was measured at 2, 4, 6 and 8 mm from cementoenamel junction.
Results: In the maxilla, the greatest inter-root distance was observed between the first molar and the second premolar at the 8-mm level from the CEJ. The inter-root distances at 4, 6, and 8 mm were significantly larger than the distance at 2 mm, showing a gradual increment as the level approaches the root apex.
Conclusion: The optimal site for placement of a frequently used MSI (diameter 1.8 to 2.0 mm) in between 2nd premolar--1st molar could be 4 mm from the CEJ and between 1st molar--2nd molar be 6 mm from the CEJ.
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