Objective: Absolute anchorage has been a critical aspect in orthodontics. Quantity and quality of bone is a critical factor in microimplant placement and stability.
The study was designed using a spiral computed tomography to assess the bone availability and clinically assess the optimized position / site for microimplant placement in the posterior region of maxilla and mandible.
Methods: Spiral computed tomography of seven patients was taken with requirement of microimplant placement in maxilla and mandible. Mesiodistal inter-radicular distance and bone thickness over narrowest inter-radicular space was measured at 2, 4, 6 and 8 mm from cementoenamel junction.
Results: Bone availability decreases from 8mm to 2 mm from the cementoenamel junction. In between 2nd premolar and 1st molar its 7mm at 8mm, 5mm at 6mm, 4mm at 4mm and 1mm at 2mm level and bone thickness of 11 mm in the maxillary arch and between 1st molar and 2nd molar its 5mm at 8mm, 4mm at 6mm, 3mm at 4mm and <1 mm at 2mm level.
Conclusion: The optimal site for placement of a 2mm or 1.8mm tapered microimplant in the posterior region is 4mm from the cementoenamel junction in between 2nd premolar and 1st molar region and 6mm between the 1st molar and 2nd molar in the maxilla and similar results found in the mandible.