A posteriori registration and subtraction of periapical radiographs for the evaluation of external apical root resorption after orthodontic treatment
Kreich Eliane Maria, Chibinski Ana Claudia, Coelho Ulisses, Wambier Leticia Stadler, Zedebski Rosario de Arruda Moura, de Moraes Mari Eli Leonelli, de Moraes Luiz Cesar,
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( Kreich Eliane Maria ) - Ponta Grossa State University School of Dentistry Department of Dental Radiology
( Chibinski Ana Claudia ) - Ponta Grossa State University School of Dentistry Department of Pediatric Dentistry
( Coelho Ulisses ) - Ponta Grossa State University School of Dentistry Department of Orthodontics
( Wambier Leticia Stadler ) - Ponta Grossa State University School of Dentistry Department of Pediatric Dentistry
( Zedebski Rosario de Arruda Moura ) - Ponta Grossa State University School of Dentistry Department of Dental Radiology
( de Moraes Mari Eli Leonelli ) - State University of Sao Paulo School of Dentistry Department of Dental Radiology
( de Moraes Luiz Cesar ) - State University of Sao Paulo School of Dentistry Department of Dental Radiology
Abstract
Purpose: This study employed a posteriori registration and subtraction of radiographic images to quantify the apical root resorption in maxillary permanent central incisors after orthodontic treatment, and assessed whether the external apical root resorption (EARR) was related to a range of parameters involved in the treatment.
Materials and Methods: A sample of 79 patients (mean age, 13.5±2.2 years) with no history of trauma or endodontic treatment of the maxillary permanent central incisors was selected. Periapical radiographs taken before and after orthodontic treatment were digitized and imported to the Regeemy software. Based on an analysis of the posttreatment radiographs, the length of the incisors was measured using Image J software. The mean EARR was described in pixels and relative root resorption (%). The patient’s age and gender, tooth extraction, use of elastics, and treatment duration were evaluated to identify possible correlations with EARR.
Results: The mean EARR observed was 15.44±12.1 pixels (5.1% resorption). No differences in the mean EARR were observed according to patient characteristics (gender, age) or treatment parameters (use of elastics, treatment duration). The only parameter that influenced the mean EARR of a patient was the need for tooth extraction.
Conclusion: A posteriori registration and subtraction of periapical radiographs was a suitable method to quantify EARR after orthodontic treatment, and the need for tooth extraction increased the extent of root resorption after orthodontic treatment.
키워드
Root Resorption; Orthodontics; Subtraction Technique; Image Processing; Computer-Assisted; Tooth Extraction
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