Table 2. Contrast-to-noise ratio (CNR) values by distance for each intracanal material with 3 different tube currents (mA) and with or without the application of a metal artifact reduction (MAR) tool.

Different uppercase superscript letters represent statistically significant differences between CNR values for the different tube currents tested within each intracanal material group and considering all distances tested with or without MAR. Different lowercase superscript letters shown with metal post values represent statistically significant differences in CNR values, without MAR, among the distances tested.

^*: statistically significant differences in CNR values compared to the same distance without MAR.