Geometric distortion of panoramic reconstruction in third molar tilting assessments: a comprehensive evaluation.

Autor: Lupi SM; 1 Department of Clinical Surgical, Pediatric and Diagnostic Sciences, University of Pavia , Pavia , Italy., Galinetto P; 2 Department of Physics, University of Pavia , Pavia , Italy., Cislaghi M; 1 Department of Clinical Surgical, Pediatric and Diagnostic Sciences, University of Pavia , Pavia , Italy., Rodriguez Y Baena A; 1 Department of Clinical Surgical, Pediatric and Diagnostic Sciences, University of Pavia , Pavia , Italy., Scribante A; 1 Department of Clinical Surgical, Pediatric and Diagnostic Sciences, University of Pavia , Pavia , Italy., Rodriguez Y Baena R; 1 Department of Clinical Surgical, Pediatric and Diagnostic Sciences, University of Pavia , Pavia , Italy.
Jazyk: angličtina
Zdroj: Dento maxillo facial radiology [Dentomaxillofac Radiol] 2018 Oct; Vol. 47 (7), pp. 20170467. Date of Electronic Publication: 2018 Jun 27.
DOI: 10.1259/dmfr.20170467
Abstrakt: Objectives:: To evaluate the geometric distortion of tilting of mandibular third molars with respect to second molars on panoramic reconstruction.
Methods:: Cone-beam CT (CBCT) reconstructions of 160 third molars, obtained due to an indication of risk of inferior alveolar nerve damage during surgery, were used. CBCT-reconstructed panoramic images were used as bi-dimensional (2D) images, to avoid distortions other than geometric distortions. The angle between the second and the third molar was measured in 2D and three-dimensional (3D) images. Student's t-test was used to assess the null-hypothesis of no difference between 2D and 3D measurements.
Results:: A significant mean difference (-2.3° ± 6.3°) between 2D and 3D measurements was found, with an absolute error of 3.6° ± 5.7° and a relative error of 10%. These findings comprehensively explain the geometric distortion on panoramic radiographs.
Conclusions:: Although a widely used and undoubtedly useful tool for diagnosis and surgical planning of mandibular third molar extractions, panoramic reconstruction are biased from geometric distortion that may influence surgical planning.
Databáze: MEDLINE
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