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This study investigated the effect of 25% silver nitrate (AgNO₃) and 5% sodium fluoride (NaF) varnish with functionalized tri-calcium phosphate (fTCP) on a Streptococcus mutans ( S. mutans ) biofilm and dentine caries lesion. Demineralised dentine specimens were treated with 25% AgNO₃ and 5% NaF + fTCP (Group 1), 25% AgNO₃ and 5% NaF (Group 2), 25% AgNO₃ (Group 3), or water (Group 4). The specimens were subjected to a S. mutans biofilm challenge after treatment. The biofilm was then studied via scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM), and colony forming units (CFU). The specimens were assessed by micro-computed tomography, X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). SEM and CLSM revealed less biofilm in Groups 1 to 3. The log 10 CFU of Groups 1 to 4 were 4.5 &amp;plusmn; 0.7, 4.4 &amp;plusmn; 0.9, 4.4 &amp;plusmn; 0.9, and 6.7 &amp;plusmn; 1.0, respectively (Groups 1, 2, 3 &lt; 4, p &lt; 0.001). The lesion depths of Groups 1 to 4 were 212.6 &amp;plusmn; 20.1 &amp;micro;m, 280.8 &amp;plusmn; 51.6 &amp;micro;m, 402.5 &amp;plusmn; 61.7 &amp;micro;m, and 497.4 &amp;plusmn; 67.2 &amp;micro;m, respectively (Groups 1 &lt; 2 &lt; 3 &lt; 4, p &lt; 0.001). XRD demonstrated silver chloride formation in Groups 1, 2, and 3. FTIR found the amide I: HPO₄ 2&amp;minus; values of the four groups were 0.22 &amp;plusmn; 0.05, 0.25 &amp;plusmn; 0.05, 0.41 &amp;plusmn; 0.12, and 0.64 &amp;plusmn; 0.14, respectively (Groups 1, 2 &lt; 3 &lt; 4; p &lt; 0.001). In conclusion, this study revealed that AgNO₃ and NaF + fTCP reduced the damage of dentine caries by cariogenic biofilm.

Effect of Silver Nitrate and Sodium Fluoride with Tri-Calcium Phosphate on Streptococcus mutans and Demineralised Dentine