Evaluation of root resorption following rapid maxillary expansion using cone-beam computed tomography

Abstract

Objective: To evaluate the root resorption after rapid maxillary expansion (RME) via cone-beam computed tomography (CBCT). Materials and Methods: Records of 25 patients who had undergone RME with tooth-borne banded expander were obtained from the archive of the orthodontic department. CBCT data were reconstructed with surface and volume rendering, and the volumetric images were manipulated to display the root surfaces from various orientations. On these three-dimensional images, permanent first molars and first and second premolars were segmented, and their roots were isolated. Volumes of roots were calculated. The difference between pre-expansion and postexpansion root volumes was statistically evaluated with a paired-samples t-test. Also, the percentage of root volume loss was calculated for each root and statistically compared with each other with one-way analysis of variance at the P , .05 level. Results: The difference between the pre-expansion and postexpansion root volumes was statistically significant for all roots investigated. Maximum volume decrease was observed for the mesiobuccal root of first molar teeth (18.60 mm 3

Evaluation and comparison of root resorption between tooth-borne and tooth-tissue borne rapid maxillary expansion appliances: A CBCT study

“…We found statistically significant resorption in P1. In this study the amount of resorption in our first premolars was more than Baysal et al 5 had evaluated root resorption volumetrically with CBCT after RME. In our opinion, the difference was due to including the cervical region in our volumetric assessment.…”

“…[16][17][18] As of today, there has been only one study evaluating root resorption after RME with CBCT in vivo. 5 The volumetric data set comprises isotropic structures, known as voxels, each representing a specific degree of X-ray absorption. 19 When the CBCT images were compared with micro CT and laser scanning, the authors found that volumetric measurements made with CBCT were all similar for voxel sizes up to 200 mm.…”

“…These are technical problems such as loosening or breakage of the expander and biological problems such as pain, 2 nonopening of the midpalatal suture, 3 dental tipping, 4 root resorption of the anchor teeth, 5 gingival recession, 6 widening of the nasal root and nasal bridge, 7 swelling and reddening, 8 and occurrence of nasal septum asymmetries. 8 Root resorption occurs because of individual biologic and genetic predisposition and the effect of mechanical factors.…”

“…Only two studies have evaluated volumetrically with CBCT the amount of root resorption occurring during orthodontic treatment. 5,16 The aim of this study was to evaluate root resorption in the first premolar (P1), second premolar (P2), and first molar (M1) after RME and to compare the amount of resorption between tooth-borne (hyrax) and toothand-tissue-borne (Haas) expanders. Repair in resorption cavities after 6 months of fixed retention was also compared.…”

Orthodontically induced inflammatory root resorption: apical and cervical complications

“…All these studies confirm the reliability and accuracy of the high resolution 3D images of the cone beam and show how valuable it is as a tool for detecting resorption 3,21,24,28 .…”