The objective of this study was to evaluate the effect of surface sealants and polishing delay time on a nanohybrid resin composite roughness and microhardness. Eighty disc specimens were made with a nanohybrid resin (Esthet-X HD, Dentsply). The specimens were divided into two groups (n=40) according to polishing time: immediate, after 10 minutes; delayed, after 48 hours. Each group was subdivided into four groups (n=10), according to the surface treatment: CG, control-rubber points (Jiffy Polishers, Ultradent); PP, rubber points + surface sealant (PermaSeal, Ultradent); PF, rubber points + surface sealant (Fortify, Bisco); PB, rubber points + surface sealant (BisCover, Bisco). Surface roughness (R) and microhardness (50 g/15 seconds) were measured. Surface morphology was analyzed by scanning electron microscopy and atomic force microscopy. The data were analyzed statistically using one-way analysis of variance and the Games-Howell post hoc test (α=0.05). PermaSeal roughness (G2) in the delayed polishing group was significantly higher ( p=0.00) than that of the other groups. No difference was observed among the groups between immediate and delayed polishing ( p=1.00), except for PermaSeal ( p=0.00). Moreover, PermaSeal showed the lowest microhardness values ( p=0.00) for immediate polishing. Microhardness was higher at delayed polishing for all the surface treatments ( p=0.00) except Fortify ( p=0.73). Surface smoothness similar to polishing with rubber points was achieved when surface sealants were used, except for PermaSeal surface sealant, which resulted in a less smooth resin composite surface. However, surface sealant application did not significantly improve composite resin microhardness.
With the advancement in ceramic restorations bonded to tooth structure, the treatment has become a feasible and conservative option to restore teeth with alteration in shape when owing to high demand in esthetics, with or without minimum tooth preparation. This article describes a report of a 32-year-old woman who was dissatisfied with her smile. The patient reported that she still had deciduous teeth, and that the maxillary lateral incisors had been restored with direct resin composite to correct the teeth shape. After discussing the restorative possibilities, a decision was made to place all-ceramic crowns (lithium disilicate glass-ceramic) with minimal tooth preparation, which figures as a conservative full-coverage approach. An esthetic outcome resembling a natural-looking smile resulted in the patient's satisfaction. Bonding of all-ceramic crowns onto minimally prepared deciduous teeth figures as a conservative treatment in case of partial anodontia, which decreases the chance of root resorption induced by trauma and benefits from good adhesion to enamel.
The aim of the study is to evaluate the influence of different thicknesses of bleaching gel on the efficacy of tooth bleaching. Seventy specimens in the form of standardized bovine enamel-dentin blocks were prepared, sequentially polished, and randomly divided into three groups, according to the bleaching agent used: CT (control-no bleaching; n=10) – Artificial saliva; HP (n=30) – 38% Hydrogen Peroxide and CP (n=30) – 10% Carbamide Peroxide. The HP and CP groups were divided into 3 subgroups according to the bleaching gel thickness: A – 0.5mm; B – 1.0mm and C – 2.0mm. The color was measured before and after (24 hours) of the bleaching treatment. Color difference (DE) and translucency (TP) were calculated. ΔE variations were statistically analyzed with two-way ANOVA. Translucency values were analyzed with the Student's T-test (p£0.05). Regarding, the DE and TP values, there were no significant differences between groups (p³0.05) for different thicknesses of bleaching gel. The thickness of the bleaching gel did not influence the effectiveness of bleaching, regardless of the bleaching agent used.
O presente artigo tem como objetivo abordar o protocolo clínico utilizado na realização de restaurações estéticas um relato de caso clínico demonstrando a técnica de estratificação incremental em resina composta para a construção dos efeitos ópticos em uma restauração do tipo Classe IV. Reproduzir as características dentais presentes no terço incisal de incisivos centrais superiores pode ser um desafio estético para o odontólogo. O profissional necessita ter o conhecimento das técnicas de inserção das diferentes camadas de resina visando garantir o mimetismo óptico dental. Além disso há uma vasta gama de compósitos que possuem diferentes graus de opacidade, croma, saturação e efeito opalescente, que aliados ao treinamento do operador, visam garantir o sucesso clínico na reprodução de tais características dentais. O resultado dependerá da criteriosa sequência de passos que envolve desde o diagnóstico até as etapas de acabamento e polimento.
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