title: Diagnosis of secondary caries in esthetic restorations: influence of the incidence vertical angle of the X-ray beam.
abstract: The aim of this study was to evaluate the accuracy on the diagnosis of secondary caries-like lesions simulated on esthetic restorations of different materials, changing the incidence vertical angle (IVA) of the x-ray beam. Twenty human teeth received MOD inlay preparations. In the experimental group (n=10), a round cavity was made in the floor of the proximal box to simulate the caries-like lesion. All teeth were restored with 3 composite resins (Charisma, Filtek-Z250 and TPH-Spectrum) at 3 moments. Two radiographic images were acquired with 0º and 10º IVA. Ten observers evaluated the images using a 5-point confidence scale. Intra- and interobserver reliability was analyzed with the Interclass Correlation Coefficient and the diagnostic accuracy was evaluated using the area under the ROC curve (A(z)), Friedman test and Wilcoxon test (α=0.05). Higher accuracy values were obtained with 10º IVA (A(z)=0.66, Filtek-Z250>A(z)=0.56, TPH-Spectrum) compared to 0º (A(z)=0.55, Charisma>A(z)=0.37, TPH-Spectrum), though without statistically significant difference (p>0.05). The detection of secondary caries-like lesions simulated on esthetic restorations of different materials suffered no negative influence by changing the IVA of the x-ray beam.
authors.affiliation: Dental School, University Center of Lavras, MG, Brazil.
authors.forename: Patrícia Lima
authors.initials: PL
authors.lastname: Moreira
authors.forename: Michel Reis
authors.initials: MR
authors.lastname: Messora
authors.forename: Stela Márcia
authors.initials: SM
authors.lastname: Pereira
authors.forename: Solange Maria de
authors.initials: SM
authors.lastname: Almeida
authors.forename: Adriana Dibo da
authors.initials: AD
authors.lastname: Cruz
mesh_terms: D016009:Chi-Square Distribution; D003188:Composite Resins; D003731:Dental Caries / Q000000981:diagnostic imaging* / Q000209:etiology; D003793:Dental Restoration, Permanent / Q000009:adverse effects* / Q000379:methods; D004955:Esthetics, Dental; D006801:Humans; D015588:Observer Variation; D012372:ROC Curve; D016300:Radiography, Bitewing / Q000379:methods*; D018709:Statistics, Nonparametric
chemical_list: C084111:Charisma composite resin; D003188:Composite Resins; C444701:Filtek Z250; C467914:TPH spectrum