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Cortical bone microdamage affects primary stability of orthodontic miniscrew
Panida Methawit1, Masayoshi Uezono2, Takeshi Ogasawara2
1Department of Orthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand; Department of Maxillofacial Orthognathics, Tokyo Medical and Dental University, Tokyo, Japan; Tokyo Medical and Dental University and Chulalongkorn University International Joint Degree Doctor of Philosophy Program in Orthodontics.
Orthodontic miniscrew design impacts bone microdamage. Wider pitch reduces damage, while taller threads decrease stability but also microdamage.
Area of Science:
- Orthodontics
- Biomaterials Engineering
- Dental Implantology
Background:
- Miniscrews are crucial for orthodontic anchorage.
- Understanding their interaction with bone is vital for clinical success.
- Cortical bone microdamage can affect implant stability.
Purpose of the Study:
- To evaluate how orthodontic miniscrew pitch and thread shape influence cortical bone microdamage.
- To explore the relationship between microdamage and primary stability.
Main Methods:
- Ti6Al4V miniscrews with varying thread height and pitch were inserted into porcine tibia cortical bone.
- Insertion torque and Periotest values were measured.
- Bone microdamage (crack length, damage area) and insertion parameters were histologically analyzed.
Main Results:
- Taller thread height miniscrews showed lower primary stability, less bone compression, and minimal microdamage.
- Narrower pitch miniscrews caused maximum bone compression and extensive microdamage.
Conclusions:
- Wider thread pitch in miniscrews effectively reduces bone microdamage.
- Decreased thread height enhances bone compression and primary stability.
