Bone density at interradicular sites: implications for orthodontic mini-implant placement

Area of Science:

• Orthodontics
• Dental Implantology
• Oral and Maxillofacial Radiology

Background:

• Implant stability is crucial for orthodontic anchorage and is linked to local bone density.
• Limited research exists on interradicular bone density concerning orthodontic mini-implant placement.
• This study addresses the need to evaluate bone density variations in interradicular sites.

Purpose of the Study:

• To assess and compare bone density differences across various interradicular sites.
• To inform optimal placement strategies for orthodontic mini-implants based on bone density.
• To investigate the relationship between bone density and anatomical location for mini-implant anchorage.

Main Methods:

• Computed tomographic (CT) scans were acquired from 28 participants (14 male, 14 female; mean age 27 years).
• Bone density was quantified in Hounsfield units (HU) at 13 interradicular locations and four distinct bone levels.
• Analysis focused on variations in bone density within the maxilla and mandible.

Main Results:

• Most evaluated sites exhibited bone densities exceeding 850 HU.
• Significant differences in bone density were observed across different levels and interradicular sites.
• Bone density increased from the alveolar crest towards basal bone in posterior regions, with an inverse trend in anterior regions.
• Mandibular bone density increased progressively from anterior to posterior areas.
• Significant bone density disparities were noted between maxillary and mandibular posterior regions.

Conclusions:

• Orthodontic mini-implants demonstrate potential efficacy in most areas with bone density up to 850 HU, extending 6 mm apical to the alveolar crest.
• Placement site selection for orthodontic mini-implants should be guided by thorough bone density assessment.
• Understanding interradicular bone density variations is essential for successful orthodontic anchorage using mini-implants.