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. 2012 May;82(3):488-94.
doi: 10.2319/060411-367.1. Epub 2011 Aug 15.

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

Asli Baysal  1 , Irfan Karadede, Seyit Hekimoglu, Faruk Ucar, Törün Ozer, Ilknur Veli, Tancan Uysal
Affiliations

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

Asli Baysal et al. Angle Orthod. 2012 May.

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)). It was determined that the distobuccal root of first molar teeth was less affected from the expansion procedure (9.47 mm(3)). No statistically significant difference was found for the percentage of root volume loss.

Conclusion: Following RME treatment, significant root volume loss was observed for all investigated posterior teeth. However, the percentage of volume loss was not statistically different among roots.

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Figures

Figure 1
Figure 1
Segmentation of premolars and first molar teeth.
Figure 2
Figure 2
Adjustment of first molar for 3D orientation.
Figure 3
Figure 3
Construction of the reference plane.
Figure 4
Figure 4
Isolation of the roots of first molar tooth.
Figure 5
Figure 5
Automatic calculation of root volume.
See this image and copyright information in PMC

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