Remineralizing Potential of Nano-Silver-Fluoride for Tooth Enamel: An Optical Coherence Tomography Analysis

Objective: To evaluate the use of nanosilver fluoride in the enamel remineralization process through optical coherence tomography. Material and Methods: All samples were submitted to demineralization process by pH cycling during 14 days and randomly distributed into three groups (n = 11): Nanosilver Fluoride (NSF), Sodium fluoride (NaF), and negative control. Optical coherence tomography images were acquired at three different moments: initial stage (T0), post caries formation (T1), and post pH cycling (T2). The integrity of the enamel surface and the measurement of the volume loss for the tissue after pH cycling in comparison to initial images were obtained from optical coherence tomography images. Results: After analyzing the exponential decay of A-scans from each group, it was possible to identify differences in light propagation among samples. In T1 it is not possible to visualize the dentin-enamel junction, probably due to the higher back scattering of the demineralized enamel, which does not allow light to reach the dentin. The decay curves obtained from NaF and nanosilver fluoride groups showed similar behavior, while the negative group showed lower extinction coefficient. Conclusion: Nanosilver fluoride showed the best effect against caries compared to conventional fluoride treatments.

Diagnóstico de lesão de cárie proximal por imagem: Revisão Sistemática / Lesion of approximal cries' diagnosis by image: A Sistematic Review

O diagnóstico de lesões cariosas proximais incipientes continua sendo um grande desafio para a Odontologia, principalmente devido à impossibilidade do acesso visual durante o exame clínico. Dessa forma, exames complementares por imagem assumem papel importante como meio auxiliar ao diagnóstico dessas lesões. O objetivo deste estudo foi avaliar as diretrizes propostas para o diagnóstico da cárie proximal por imagem mediante uma revisão sistemática da literatura dos últimos cinco anos.

The diagnosis of incipient proximal caries remains a major challenge for dentistry, mainly due to the impossibility of visual access during the clinical examination, and imaging methods play an important role as an aid to diagnosis of these lesions. The aim of this study was to evaluate the guidelines for the diagnosis of proximal caries' image through a systematic review of the literature produced at the last five years.