Related Experiment Video
Updated: May 15, 2026
07:32
Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition
Published on: February 23, 2024
Orthodontic miniscrew failure rate and root proximity, insertion angle, bone contact length, and bone density
H Watanabe1, T Deguchi, M Hasegawa
1Division of Orthodontics and Dentofacial Orthopedics, Tohoku University Graduate School of Dentistry, Sendai, Japan.
Orthodontics & Craniofacial Research
|January 15, 2013
Summary
Miniscrew failure is most affected by root proximity, particularly in the mandible. Other factors like insertion angle and bone density had no significant impact. Cone beam computed tomography (CBCT) is superior for assessing miniscrew root proximity.
Area of Science:
- Orthodontics
- Dental Implantology
- Biomaterials Science
Background:
- Miniscrews are widely used as orthodontic anchorage.
- Understanding factors influencing miniscrew stability is crucial for successful treatment outcomes.
- Previous studies have yielded conflicting results regarding factors affecting miniscrew success rates.
Purpose of the Study:
- To investigate the correlation between miniscrew failure and root proximity, insertion angle, bone contact length, and bone density.
- To compare the diagnostic accuracy of cone beam computed tomography (CBCT) and periapical radiographs in assessing miniscrew placement parameters.
Main Methods:
- A retrospective study of 190 miniscrews placed in 107 patients.
- Analysis of cone beam computed tomography (CBCT) scans and periapical radiographs.
- Statistical comparison of root proximity, insertion angle, bone contact length, and bone density between successful and failed miniscrews.
Main Results:
- Miniscrew success rates were higher in the maxilla than the mandible.
- Closer root proximity was significantly associated with miniscrew failure.
- No significant differences were found in insertion angle, bone contact length, or bone density between success and failure groups.
- Cone beam computed tomography (CBCT) showed superior concordance with actual measurements compared to periapical radiographs.
Conclusions:
- Root proximity is the primary factor influencing miniscrew failure, especially in the mandible.
- Miniscrew angle, bone contact length, and bone density do not significantly impact failure rates.
- Cone beam computed tomography (CBCT) is a more reliable imaging modality than periapical radiographs for evaluating miniscrew-root proximity.
