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Published on: October 27, 2023
Root and pulp response after intentional injury from miniscrew placement
Rahul Renjen1, Anthony L Maganzini, Michael D Rohrer
1Division of Orthodontics, Department of Dentistry, Montefiore Medical Center, University Hospital for the Albert Einstein College of Medicine, Bronx, NY, USA. Renjen_Rahul@guthrie.org
Summary
Miniscrews causing root surface abrasion in dogs did not lead to permanent pulp or tissue damage. Reparative cementum formed, and woven bone indicated osseointegration, suggesting minimal long-term harm from miniscrew root contact.
Area of Science:
- Orthodontics
- Dental Implantology
- Periodontology
Background:
- Miniscrews are widely used in orthodontics.
- Potential root surface damage during miniscrew placement is a concern.
Purpose of the Study:
- To assess the histological effects of miniscrew-induced root surface abrasion.
- To evaluate the impact on pulp and supporting tissues.
Main Methods:
- Sixty miniscrews were placed in beagle dogs, intentionally causing root damage.
- Histological analysis and microcomputed tomography were performed on selected injury sites after 12 weeks.
Main Results:
- No inflammatory response, pulp necrosis, external resorption, or ankylosis were observed.
- Reparative cementum was present at all injury sites.
- Woven bone formation supported osseointegration of the miniscrews.
Conclusions:
- Miniscrew abrasion or penetration of the root surface does not typically cause permanent damage to pulp or supporting tissues.
- The findings suggest a favorable tissue response to minor root trauma from miniscrews.