3D Analysis of Tooth Movement Using 3D Technology
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CRANIOFACIAL SKELETON (J HELMS AND T DEGUCHI, SECTION EDITORS)
3D Analysis of Tooth Movement Using 3D Technology Chung How Kau 1
&
David A. Cruz Wilma 2
Accepted: 29 September 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Purpose of Review 3D cone beam imaging (CBCT) has allowed clinicians to better understand the anatomical variations of cranial anatomy. One crucial aspect of this technology plays is the understanding of alveolar bone morphology and remodeling. Variations in cortical bone thickness between individuals have been reported. No published study has analyzed the relationship between cortical bone thickness and rate of tooth movement. The aim of this study is to begin answering the question: is there an association between rate of tooth movement and cortical bone thickness? Recent Findings Twenty-three patients underwent extraction of a single premolar in each of the four quadrants prior to orthodontic therapy. Routine clinical records including 3D CBCT images were acquired of all patients prior to first premolar extractions. Rate of tooth movement in each quadrant for each patient was determined via mesiodistal millimetric measurements obtained by a single calibrated operator. With CBCT images, cortical bone thickness was measured at various levels from the alveolar crest along the long axis of the to-be-extracted first premolars. The association between cortical bone thickness and rate of tooth movement was analyzed. Statistically significant associations were found between rate of tooth movement and cortical bone thickness at levels 2 mm, 5 mm, and 8 mm, apical to the alveolar crest in both the right and left maxillary quadrants (p < 0.05). Statistically significant associations were found between rate of tooth movement and cortical bone thickness at levels 5 mm and 8 mm apical to the alveolar crest in both mandibular quadrants (p < 0.05). Increased cortical bone thickness was associated with decreased rate of tooth movement. There was no statistically significant association between rate of tooth movement and cortical bone thickness 2 mm apical to the alveolar crest of the to-be-extracted first premolars in the mandibular left nor right quadrants (p > 0.05). Summary Results suggest an inverse relationship may exist between cortical bone thickness and rate of tooth movement in both the maxilla and mandible. Cortical bone thickness may have the potential to serve as a predictive tool for rate of orthodontic tooth movement. Keywords 3D CBCT . Premolar extraction . Dental radiography . Tooth movement . Retrospective analysis
Background Traditional orthodontic records for patients include clinical photographs, study models, and radiographs. In the past, lateral cephalograms and panorex radiographs provided the mainstay of understanding orthodontic diagnosis, treatment planning, treatment progress, and clinical success. Routine This article is part of the Topical Collection on Craniofacial Skeleton * Chung How Kau [email protected] 1
Department of Orthodontics, School
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