Morphological & chemo mechanical analysis of exposed cervical dentin treated with three different desensitizing pastes (comparative in vitro study).

A highly significant difference was observed between BAG and Nano-HAP groups (mean difference = −8.731, p = 0.000), with the Nano-HAP group showing superior hardness values ( Table (3) , Table (4) , Figure (7) , Figure (8) ). 3.3 Correlation between phosphate and VHN Pearson correlation analysis across all groups revealed a statistically significant positive correlation between phosphate Raman peak intensity and Vickers microhardness values (r = 0.600, p = 0.000), suggesting that increased mineral content is generally associated with higher surface hardness.

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