Browsing by Subject "Remineralization"

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    Effect of highly concentrated bleaching gels on enamel microhardness and superficial morphology, and the recovery action of four remineralizing agents
    (BioMed Central, 2022-12-27) Melo, María; Fioresta, Rosella; Sanz, José Luis; Pecci Lloret, María Pilar; Llena, Carmen; Dermatología, Estomatología, Radiología y Medicina Física
    Abstract Background: Dental bleaching is a common clinical practice. The aim of this study is to investigate the efect of 35% hydrogen peroxide (HP) bleaching gel on the morphology and microhardness of enamel, and to analyze the efect of four remineralizing agents. Methods: One hundred blocks were prepared. The enamel surfaces were bleached with 35% HP in one session. The specimens were divided into four remineralization treatment groups (n=25). G1: Tooth Mousse, G2: Remin-Pro, G3: Colgate Pro-Relif, G4: Mirafuor. The remineralizing protocol was applied 3 min per day for one week. Vickers micro‑ hardness (HV) measurements and SEM observations were performed at baseline, after bleaching, and after remineral‑ izing treatment in all groups. Statistical analyses were performed using the paired t-test and ANOVA. Results: After bleaching, SEM showed an increase of irregularities on the surface of the samples. Enamel microhard‑ ness decreased a mean of 47.7 HV, equivalent to a mean decrease of 18.3% (p<0.05). After remineralization, the HV increased in all groups between 16 and 33% (p<0.01), recovering the initial microhardness of enamel samples. SEM images revealed a higher quantity of superfcial mineral deposits in groups 1 and 2 compared to the rest of the groups. Conclusions: The application of remineralizing products generates a signifcant increase in enamel microhardness. Tooth Mousse-treated samples showed a greater microhardness recovery, followed by Remin Pro. The superfcial morphology of the samples refects the results obtained in the HV tests. Keywords: Enamel microhardness, Enamel morphology, Remineralization, Hydrogen peroxide, Dental bleaching
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    Effects of fluoride and calcium phosphate-based varnishes in children at high risk of tooth decay: a randomized clinical trial
    (MDPI, 2021-09-24) Poza-Pascual, Andrea; Serna-Muñoz, Clara; Pérez-Silva, Amparo; Martínez Beneyto, Yolanda; Cabello, Inmaculada; Ortiz Ruiz, Antonio José; Dermatología, Estomatología, Radiología y Medicina Física
    The aim of this study was to investigate the effect of the application of two varnishes—MI Varnish (5% sodium fluoride with CPP-ACP) and Clinpro White Varnish (5% sodium fluoride with fTCP)—applied every three months in children with high caries risk for 12 months on plaque indexes, salivary pH, salivary lactic acid and chemical elements concentrations. Methods: We included 58 children aged 4–12 years, assigned to control (placebo), Clinpro and MI groups. Baseline and three-month saliva samples were taken. We assessed changes in pH, lactic acid concentrations and chemical elements in saliva. Results: At 12 months, all groups showed a nonsignificant increase in pH levels and a reduction in lactic acid, which was greatest in the placebo group. There was a significant reduction in 24Mg (p = <0.001), 31P (p = 0.033) and 66Zn (p = 0.005) levels in the placebo group (p ≤ 0.05), but not in the other elements studied: 23Na, 27Al, 39K, 44Ca, 52Cr, 55Mn, 57Fe, 59Co, 63Cu, 75As, 111Cd, 137Ba, 208Pb and 19F. Conclusions: Neither pH, lactic acid concentrations or most salivary chemical elements were useful in defining patients at high risk of caries or in monitoring the effect of MI Varnish and Clinpro White Varnish after three-month application for 12 months. However, the appearance of new cavities was stopped, and the hygiene index improved, probably due to hygienic and dietary measures and the use of fluoridated toothpaste. Trial registration: ISRCTN registry, ISRCTN13681286.
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    Influence of fluoride varnish application on enamel adhesion of a universal adhesive
    (Quintessence Publishing, 2021-01) Ortiz Ruiz, Antonio José; Martínez Marco, Francisco José; Pérez Silva, Amparo; Serna Muñoz, Clara; Cabello, Inmaculada; Banerjee, Avijit; Dermatología, Estomatología, Radiología y Medicina Física
    Purpose: To study the effect of the varnish type, application time and surface polishing on the shear bond strength (SBS) of a universal adhesive in healthy and demineralized bovine enamel. Materials and Methods: 432 bovine primary central incisors were assigned to 18 groups according to enamel mineralization [healthy and demineralized], topical varnish [Clinpro White Varnish (CWV; 3M Oral Care) and Profluorid (PFV, Voco)], remineralization time [24 h or 21 days] and polishing or not of the enamel surface. Adhesion was tested using Futurabond M (Voco)+ and GrandioSO (Voco). Sheer bond strength (SBS) was measured and the fracture mode studied. The statistical analysis was performed using two-way ANOVA, Tukey's test, and Pearson's chi-squared test. Results: In healthy bovine enamel, CWV reduced SBS at 24 h and 21 days; polishing significantly improved SBS. PFV increased SBS in healthy enamel at 21 days and demineralized enamel at 24 h and 21 days; polishing had no effect on SBS. The application time and polishing of the enamel surface affected the behavior of varnishes with respect to SBS. There was a correlation between the type of fracture and the degree of mineralization as well as the timepoint of varnish application. Conclusions: Remineralization of demineralized enamel with fluoride varnishes permits the recovery of the bond strength obtained in healthy enamel. Of the two varnishes studied, PFV had the highest SBS and more uniform behavior, regardless of the application timepoint, degree of mineralization, and surface treatment of the enamel.