Table 1. Calcium and phosphorus levels of dental plaque at baseline and after 3 days application of the HAP-gel in vivo (29 children).

EDX analyses	Baseline	After the study
Abbreviations: EDX, energy-dispersive X-ray; HAP, particulate hydroxyapatite; SD, standard deviation.
Calcium	Median: 0.25 wt% Mean with SD: 0.74 ± 1.82 wt%	Median: 0.40 wt% Mean with SD: 0.54 ± 0.49 wt%
Phosphorus	Median: 1.17 wt% Mean with SD: 1.25 ± 0.75 wt%	Median: 1.41 wt% Mean with SD: 1.43 ± 0.58 wt%