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Evaluation of three‐dimensional root surface changes and resorption following rapid maxillary expansion: a cone beam computed tomography investigation
Author(s) -
Akyalcin S.,
Alexander S. P.,
Silva R. M.,
English J. D.
Publication year - 2015
Publication title -
orthodontics and craniofacial research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.664
H-Index - 55
eISSN - 1601-6343
pISSN - 1601-6335
DOI - 10.1111/ocr.12069
Subject(s) - cone beam computed tomography , medicine , molar , dentistry , premolar , maxillary first molar , root resorption , orthodontics , radiography , maxilla , resorption , computed tomography , radiology , pathology
Structured Abstract Objectives To evaluate root surface changes and resorption following toothborne rapid maxillary expansion ( RME ) using cone beam computed tomography ( CBCT ). Setting and Sample Population The D epartment of O rthodontics at T he U niversity of T exas H ealth S cience C enter. Twenty‐four consecutively treated patients (mean age: 12.8 years) requiring maxillary expansion. Material and Methods An observational cohort included 48 CBCT images collected prior to ( T 1) and 4.8 months after ( T 2) RME from the study sample. Maxillary (study group) and mandibular (control group) first molars (n = 48) and first premolars (n = 48) were segmented and digitally registered using a ‘best‐fit’ algorithm. Linear surface and volumetric changes between the study and control groups were compared using independent sample t ‐tests. Additionally, individual root length measurements were compared between the T 1 and T 2 images in each group using paired t ‐tests. Results All study teeth had significant changes for the evaluation of maximum linear surface area and volumetric changes as compared to control teeth ( p < 0.05). On average, premolars and molars in the study group experienced a root shortening of 0.36–0.52 mm ( p < 0.05). Color‐coded diagrams demonstrated thinning and resorption occurring primarily at the apex and buccal aspects of the roots. Severity of these changes was individual‐specific, as root resorption patterns were non‐uniform. Conclusion Significant volume loss, linear surface area changes, and thinning/shortening of maxillary first molar and premolar roots were common findings with the use of toothborne RME therapy.