Bone depth and thickness of different infrazygomatic crest miniscrew insertion paths between the first and second maxillary molars for distal tooth movement: A 3-dimensional assessment
| Autor: | Lutao Li, Jianyi Li, Jiuyu Zhu, Tiancheng Fan, Jinchuan Tan, Bingran Du |
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| Rok vydání: | 2019 |
| Předmět: |
Orthodontics
Molar Adult Cone beam computed tomography Bone thickness Tooth Movement Techniques business.industry Bone Screws 030206 dentistry Significant negative correlation Cone-Beam Computed Tomography 03 medical and health sciences 0302 clinical medicine Protocol design Maxilla Tooth movement Orthodontic Anchorage Procedures Medicine Humans Crest business 030217 neurology & neurosurgery |
| Zdroj: | American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics. 160(1) |
| ISSN: | 1097-6752 |
| Popis: | Introduction This research aimed to measure the bone depth and thickness of different insertion paths for safe placement of infrazygomatic crest miniscrews between the first (U6) and second maxillary molars (U7) by 3-dimensional (3D) reconstruction and to explore their clinical significance. Methods Cone-beam computed tomography data from 36 adult orthodontic patients were obtained to generate 3D models (n = 72) of the infrazygomatic crest region. For each model, the bone depth and thickness of 27 different insertion paths were measured in the region between U6 and U7. The relationship between bone depth and thickness was statistically analyzed. The clinical risk for each insertion path was assessed according to the impacts of bone depth and thickness on insertion failure. Results Maximum bone depth (median, 7.41 mm; mean, 8.42 mm) was present at 13 mm insertion sites with a gingival tipping angle of 50° and a distal tipping angle of 30°. Maximum bone thickness (median, 3.73 mm; mean, 4.00 mm) was present at 17 mm insertion site with a gingival tipping angle of 70° and a distal tipping angle of 30°. There was a significant negative correlation between bone depth and bone thickness (rs = −0.569, P Conclusions Because the bone depth and thickness may affect the safe insertion of infrazygomatic crest miniscrews in the region between U6 and U7 and they are negatively related, a safe insertion protocol design for distal tooth movement should take both into consideration. |
| Databáze: | OpenAIRE |
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