Diagnostic accuracy of cone beam computed tomography sections with various thicknesses for detecting misfit between the tooth and restoration in metal-restored teeth

• Published in: Oral surgery, oral medicine, oral pathology and oral radiology Vol. 120; no. 2; pp. e131 - e137
• Main Authors: Liedke, Gabriela Salatino, DDS, MSc, PhD, Spin-Neto, Rubens, DDS, MSc, PhD, Vizzotto, Mariana Boessio, DDS, MSc, PhD, da Silveira, Priscila Fernanda, DDS, MSc, Wenzel, Ann, DDS, PhD, DrOdont, da Silveira, Heloisa Emilia Dias, DDS, MSc, PhD
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01-08-2015
• Subjects: Cone-Beam Computed Tomography; Dental Marginal Adaptation; Dental Restoration, Permanent; Dentistry; Humans; In Vitro Techniques; Metals; Prosthesis Fitting; Radiographic Image Interpretation, Computer-Assisted; Surgery; Tooth - diagnostic imaging
• ISSN: 2212-4403; 2212-4411
• DOI: 10.1016/j.oooo.2015.05.004

Objective To evaluate the diagnostic accuracy of cone beam computed tomography (CBCT) sections with various reconstruction thicknesses for detecting misfit between tooth and restoration in metal-restored teeth. Study Design Eighty teeth (perfect fit, 40 of these used with 0.2 mm gap, and 40 with 0.4 mm gap), were imaged with large FOV i-CAT. Images were reconstructed in five thicknesses: 0.2 (voxel size), 1, 2, 5, and 10 mm. Four examiners assessed the presence of gaps using a 5-point scale. Area under the receiver operating characteristics curve (aucROC) for misfit detection was calculated for each variable. A multivariate logistic regression was performed by using misfit detection accuracy as the dependent variable. Results The score “cannot decide” decreased when the reconstruction thickness was increased. Mean aucROC ranged between 0.60 and 0.72. Logistic regression showed that the presence of a gap and reconstruction thickness had an impact on diagnostic accuracy. Conclusions Diagnostic accuracy of CBCT sections was low for detecting misfit in metal-restored teeth.