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Published on: October 18, 2021
Assessment of infrazygomatic bone depth for mini-screw insertion
Sebastian Baumgaertel1, Mark G Hans
1Department of Orthodontics, School of Dental Medicine, Case Western Reserve University, Cleveland, OH 44106, USA. sxb155@case.edu
Clinical Oral Implants Research
|March 14, 2009
Summary
Orthodontic mini-screw insertion into the infrazygomatic crest requires careful consideration of bone depth. Bone depth varies significantly, and placement near molar roots risks complications like sinus perforation.
Area of Science:
- Orthodontics
- Dental Anatomy
- Biomaterials
Background:
- Orthodontic mini-screws are crucial for anchorage.
- The infrazygomatic crest is a potential site for mini-screw placement.
- Understanding bone depth is vital for safe and effective insertion.
Purpose of the Study:
- To measure bone depth at the infrazygomatic crest.
- To evaluate suitability for orthodontic mini-screw insertion.
- To identify optimal placement locations and depths.
Main Methods:
- Cone-beam computed tomography (CBCT) scans of 29 adult human dry skulls.
- Measurements taken at three infrazygomatic crest sites and five levels.
- Statistical analysis using intraclass correlation and ANOVA.
Main Results:
- Greatest bone depth observed approximately 11.48 mm apical to the maxillary first molar cemento-enamel junction.
- Maximum bone depth (7.05 mm) found at the lowest measurement level, but with insufficient clearance to molar roots.
- Both measurement site and level significantly impacted bone depth.
Conclusions:
- Insertion of 6mm or longer mini-screws into the infrazygomatic crest carries risks of maxillary sinus or nasal cavity perforation.
- Bone depth is highly variable between individuals.
- Careful planning is essential to avoid root proximity and anatomical perforation.
