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Laser fluorescence (LFpen) readings and the results of Kruskal-Wallis analysis to test the significance of the differences in LFpen readings amongst the current study’s three groups of approximal surfaces: sound, with white/brown spots and cavitated surfaces
| Approximal surface’s status | Number | LFpen readings’ mean (SD) | Mean rank | P value |
|---|---|---|---|---|
| Intact | 30 | 6.5 (2.5) | 18.63 | <0.001 |
| With white/brown spots | 30 | 15.1 (7.8) | 45.20 | |
| With cavitation | 30 | 34.7 (16.1) | 72.67 |
