In vitro effects of hydrogen peroxide combined with different activators for the in-office bleaching technique on enamel

The aim of this study was to evaluate the alteration of human enamel bleached with high concentrations of hydrogen peroxide associated with different activators. Fifty enamel/ dentin blocks (4 x 4 mm) were obtained from human third molars and randomized divided according to the bleaching procedure (n = 10): G1 = 35% hydrogen peroxide (HP -Whiteness HP Maxx); G2 = HP + Halogen lamp (HL); G3 = HP + 7% sodium bicarbonate (SB); G4 = HP + 20% sodium hydroxide (SH); and G5 = 38% hydrogen peroxide (OXB - Opalescence Xtra Boost). The bleaching treatments were performed in three sessions with a 7-day interval between them. The enamel content, before (baseline) and after bleaching, was determined using an FT-Raman spectrometer and was based on the concentration of phosphate, carbonate, and organic matrix. Statistical analysis was performed using two-way ANOVA for repeated measures and Tukey's test. The results showed no significant differences between time of analysis (p = 0.5175) for most treatments and peak areas analyzed; and among bleaching treatments (p = 0.4184). The comparisons during and after bleaching revealed a significant difference in the HP group for the peak areas of carbonate and organic matrix, and for the organic matrix in OXB and HP+ SH groups. Tukey's analysis determined that the difference, peak areas, and the interaction among treatment, time and peak was statistically significant (p < 0.05). The association of activators with hydrogen peroxide was effective in the alteration of enamel, mainly with regards to the organic matrix737516521FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP05/60082-4 01/14384-

Dispositivo De Controle De FumaÇa E Uso Do Referido Dispositivo

DISPOSITIVO DE CONTROLE DE FUMAÇA E USO DO REFERIDO DISPOSITIVO. A presente invenção refere-se a um dispositivo de controle de fumaça de tabacaria utilizado em testes de pigméntação e depósitos tóxicos oriundos em substratos dentais e materiais odontológicos. Além disso, a presente invenção refere-se ao uso do referido dispositivo.BRPI1101465 (A2)G01N1/22BR2011PI01465G01N1/2

Influence of coffee and red wine on tooth color during and after bleaching

Made available in DSpace on 2019-09-12T16:57:01Z (GMT). No. of bitstreams: 0 Previous issue date: 2013Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Objective. The aim of this study was to evaluate the influence of coffee and red wine staining on tooth color during and after bleaching. Materials and methods. Blocks obtained from human molars were divided into 11 groups (n = 5) in accordance with the bleaching treatment-peroxide carbamide 10%, 15% or 20%-and in accordance with the stain therapy-coffee, wine or without staining (control). Color change analysis was performed by photo-reflectance using a spectrophotometer, during (3-times/week) and after (7, 15 and 30 days) the bleaching treatment. During the experiment, the samples were stored in artificial saliva. The results were submitted to statistical analysis with the Dunnet and Tukey tests (p 0.05) or without storage in pigment solution. After the bleaching, there were statistically significant differences between the groups treated with coffee (30th day) and wine (7th and 30th days) relative to the control, which was treated with whitening agents. Conclusion. During bleaching, remineralization of the enamel with artificial saliva and the subsequent bleaching session were effective in preventing enamel staining. After the whitening procedures, both stain therapies-coffee and wine-caused enamel color changes; however, the wine led to greater staining than did coffee.[Pini, Nubia Pavesi; Baggio Aguiar, Flavio Henrique; Lovadino, Jose Roberto] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Restorat Dent, Piracicaba, SP, Brazil[Susy Liporoni, Priscila Christiane] Universidade de Taubaté (Unitau), Dept Restorat Dent[Munin, Egberto] Univ Camilo Castelo Branco, Unicastelo, Sao Jose Dos Campos, SP, Brazil[Bovi Ambrosano, Glaucia Maria] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Social Dent Stat, Piracicaba, SP, Brazi

Effect of Different Light-Curing Modes on Degree of Conversion, Staining Susceptibility and Stain's Retention Using Different Beverages in a Nanofilled Composite Resin

Statement of Problem:It is unknown whether the staining pigment concentration would affect the color of composite resin and whether the absorption of the staining pigment is related to the degree of conversion (DC).Purpose:The purpose of this study was to evaluate the effect of light-curing units (LCUs) on DC, superficial staining (Delta E), and pigment concentration (PC) in a nanofilled composite resin (Z350, 3M ESPE) using different beverages.Materials and Methods:Specimens were polymerized for 20 seconds using four LCUs (N = 50): quartz-tungsten-halogen (QTH)-450 mW/cm2; laser (LAS)-300 mW/cm2; second-generation light-emitting diode (LED)-1100 mW/cm2; and third generation LED-700 mW/cm2. DC (%) was measured using Fourier transform infrared spectroscopy. Specimens concerning each group (N = 10) were then immersed in one of the solutions (distilled water, red wine, whisky, coffee, and cola-40 min/day, for 40 days). Specimen's color was measured before and after exposure to solutions using a colorimeter (Commission Internacionale de I'Eclairaga L* a* b* color scale), and Delta E was calculated. Specimens were then prepared for the spectrophotometric analysis to measure PC. Data were submitted to two-way analysis of variance and Tukey's test (p = 0.05).Results:DC: QTH presented the lowest DC, with statistical differences for LAS, LED 2, and LED 3. Whisky and wine showed lower PC mean values than cola and coffee. No statistical difference was observed for LCUs regarding PC and all staining solutions, except cola. Whisky showed the highest values for Delta E regarding all LCUs. Wine showed statistically lower Delta E than whisky, with water presenting the lowest Delta E. LAS and QTH showed higher values than LED 2 concerning Delta E.Conclusion:LCUs interfered with DC and altered the PC and Delta E of the composite resin submitted to different staining solutions. There was no correlation among DC, PC, and Delta E.CLINICAL SIGNIFICANCELight-curing modes might interfere with staining susceptibility, stain's retention, and DC of a composite resin, compromising the clinical performance. The highest pigment absorption was not associated with the highest superficial staining of the composite resin. Alcoholic drinks lead to greater superficial staining and non-alcoholic solutions lead to a higher pigment concentration.(J Esthet Restor Dent 23:106-115, 2011).Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Effects of Bleaching Agents Combined with Regular and Whitening Toothpastes on Surface Roughness and Mineral Content of Enamel

Made available in DSpace on 2019-09-12T16:53:49Z (GMT). No. of bitstreams: 0 Previous issue date: 2015Objective: The purpose of this study was to evaluate surface roughness and changes in the composition of enamel submitted to different bleaching protocols and toothbrushing with regular and whitening toothpastes. Background data: Bleaching treatment could promote morphological and chemical changes in enamel surface. Methods: Enamel blocks were randomized into nine groups (n=10) according to the bleaching treatment (no bleaching, control group; 6% hydrogen peroxide, HP; or 10% carbamide peroxide, CP) and toothpaste used (placebo, PL; regular, R; or whitening dentifrice, W). Bleaching was performed according to manufacturers' instructions and all groups were submitted to 30,000 cycles of simulated toothbrushing with toothpaste (PL, R, or W). Mineral content evaluation and enamel roughness were evaluated initially (T-1), after bleaching (T-2), and after toothbrushing (T-3), using an energy-dispersive micro X-ray fluorescence spectrometer and profilometry, respectively. Data were statistically analyzed with two way ANOVA, Tukey, and Dunnett tests (5%). Results: Enamel surface roughness was influenced by bleaching and toothbrushing. Surface roughness increased for the groups that brushed with the placebo dentifrice (CP+PL, HP+PL, C+PL) and for the control group that brushed with whitening dentifrice (C+W). Enamel Ca/P ratio decreased after bleaching, but toothbrushing, regardless of the dentifrice used, did not reduce the enamel mineral content. Conclusions: The bleaching treatment resulted in a decrease of enamel mineral content, but the studied dentifrices did not contribute to surface mineral loss.[Attia, Mariana Lerner; Cavalli, Vanessa; Freitas D'Arce, Maria Beatriz; do Rego, Marcos Augusto; Suzy Liporoni, Priscila Christiane] Universidade de Taubaté (Unitau), Dept Restorat Dent, BR-12020330 Taubate, SP, Brazil[do Espirito Santo, Ana Maria] Univ Fed Sao Paulo, Dept Math & Earth Sci, Diadema, SP, Brazil[Martin, Airton Abrahao] Univ Paraiba Valley, Res & Dev Inst IP&D, Sao Jose Dos Campos, SP, Brazil[Baggio Aguiar, Flavio Henrique; Lovadino, Jose Roberto; Suzy Liporoni, Priscila Christiane] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Restorat Dent, Piracicaba, SP, Brazil[Cavalcanti, Andrea Nobrega] Univ Fed Bahia, Sch Med & Publ Hlth Bahia, Sch Dent, Area Restorat Dent, Salvador, BA, Brazil[Cavalcanti, Andrea Nobrega] Univ Fed Bahia, Sch Dent, Salvador, BA, Brazi