Abstract
This study utilized the confocal Raman microspectroscopy (CRM) technique
for the first time to investigate the degree of the penetration of
toluidine blue-orto (TBO) in artificial caries lesions produced by two distinct caries-inducing models. The dentin specimens (n=10) were
divided into three groups: control, in vitro and in situ. Thereafter,
the lesion depth and the demineralization level were evaluated by
cross-sectional microhardness (CSMH). CRM mapping across the dentin
surface was assessed after the dye application. The CSMH and CRM data
were analyzed by t-test and ANOVA, respectively (P<0.05). The values of
the lesion depth and the demineralization areas were higher for in situ
samples (P<0.05). The TBO penetration values (m) for the control, in
vitro and in situ groups were 44.8 +/- 5.6, 46.1 +/- 4.5 and 51.2 +/-
8.5, respectively. There were no statistically significant differences
among the groups (P>0.05). The rate of TBO penetration was detected up
to about <50m and the demineralization level did not influence the
results. These results have showed promising parameters to develop new
protocols for deep caries lesions management using photodynamic
antimicrobial chemotherapy.
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