The first question for PAN addressed the imaging quality in the clinical relevant area of interest (clinical data were given). Three answers were possible: 1 = good visibility and can be evaluated, 2 = visible but cannot be evaluated, and 3 = not visible. The second question asked for an additional need for CBCT scans. Three answers were possible: 1 = required, 2 = reasonable, and 3 = not required. The third question was referring to the number of additional incidental findings in PAN not related to the sinus disease that led to the radiographic examination.

For CBCT, the first question was referring to a possible additional value in the area of interest. The examiners had to choose between three possible answers (1 = showed no additional information, 2 = was useful, 3 = was affecting therapy). The second question targeted the number of incidental findings in CBCT in addition to PAN not related to the sinus disease that led to the radiographic examination.

Due to the experimental design, no prior power analysis was conducted. All results in this study were expressed as number of cases, incidence value (percentage), or as arithmetic means ± standard deviation (SD). For comparison of groups, one-way analyses of variance (ANOVA) with Tukey B simultaneous post hoc tests as well as chi-square tests were performed and descriptive p values of the tests are reported. A p value ≤0.05 was termed significant. All statistical analyses were performed with SPSS version 20.0 (SPSS Inc., Chicago, IL, USA).