Replacement of the distorted dentition of the Cone Beam Computed Tomography (CBCT) scans for orthognathic surgery planning

Publication date: Available online 28 February 2018
Source:Journal of Oral and Maxillofacial Surgery
Author(s): Turki Almutairi, Kurt Naudi, Neil Nairn, Xiangyang Ju, John Whitters, Aashraf Ayoub
PurposeCBCT imaging does not record dental morphology accurately due to the scattering produced by metallic restorations and the reported magnification. The aim of this study was the development and the evaluation of a new method for the replacement of the distorted dentition of CBCT scans with 3D dental image captured by a digital intraoral camera.
Materials and MethodSix dried skulls with orthodontics brackets fixed on the teeth were used in this study. Three intra-oral markers made of dental stone were constructed and attached to orthodontics brackets. The skulls were CBCT scanned and occlusal surfaces were captured using TRIOS ^® 3D intraoral scanner. The digital intra-oral scan (IOS) was fused into the CBCT models. This produced a new composite digital model of the skull and dentition. The skulls were scanned again using the commercially accurate Laser Faro^® arm to produce the 3D model "gold standard" for the assessment of the accuracy of the developed method. This was assessed by measuring the distance between the occlusal surfaces of the new composite model and the "gold standard" 3D laser scanned modelResultsThe results showed the errors related to the superimposition of the intra-oral image on the CBCT to replace the distorted dentition were between 0.11 and 0.20 mm.ConclusionThe results of this study suggests that the dentition in the CBCT can be accurately replaced with the digital IOS captured by an intra-oral scanner to create a composite model which will improve the accuracy of the digital orthognathic surgical planning and the fabrication of an occlusal wafer.



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