Surface roughness and color stability of surface sealants and adhesive systems applied over a resin-based composite.

OBJECTIVE: To evaluate coating materials regarding color and roughness changes when applied over a composite resin. MATERIALS AND METHODS: Specimens were made using Filtek Supreme Ultra. Coating materials were applied over the specimens' surface: Control (CTRL); Adper Single Bond Plus (SB); Scotchbond Universal (US); Clearfil SE (CL); Ambar APS (APS); Bioforty (BF); Fortify (FF); PermaSeal (PS); G-CoatPlus (GC). Specimens were evaluated regarding color changes (∆E00 ) using spectrophotometer (n = 10); surface roughness (Ra), using optical profilometer (n = 10); surface topography, using scanning electron microscopy (n = 1); and thickness of material, using optical microscopy (n = 1). Analyses were made before and after 24, 72, and 168 hours of storage in wine, used as a staining solution. Data was statistically analyzed using analysis of variance, Tukey and Pearson tests (α:.05). RESULTS: None of the materials presented color stability. ∆E00 increased with increasing storage time at red wine, until 72 hours. BF, FF, PS, SB, and CTRL presented the lowest ∆E00 after 24 hours. APS presented the highest ∆E00 (32.59; P < .05). Regarding roughness, initially, surface sealants and APS presented the lowest values. After 168 hours, GC presented the lowest Ra (0.60; P < .05). CONCLUSIONS: All the materials presented color and roughness changes after storage in red wine. CLINICAL RELEVANCE: Some coating materials can be applied over the surface of RBC restorations without changing its color stability or surface roughness.

Avaliação da resistência adesiva à tração de diferentes agentes cimentantes a uma liga de NiCr após uma hora de armazenamento / One-hour tensile bond strength of different luting agents to a NiCr alloy

Introdução: O objetivo deste estudo é avaliar as alterações cefalométricas verticais em mulheres brasileiras com má oclusão de Classe II, 1ª Divisão, tratadas ortodonticamente com e sem exodontia de pré-molares. Métodos - Foram analisadas 78 telerradiografias cefalométricas em norma lateral, nas fases pré e pós-tratamento, de 39 mulheres leucodermas. A amostra foi dividida em dois grupos: com exodontia dos quatro primeiros pré-molares (n = 14) e sem exodontias (n = 25). As medidas cefalométricas investigadas foram: Is-St, Sn-St, Is-PP, Ms-PP, Ei, SN.GoMe, SN.Gn, SN.PP, PP.GoMe e PP.MsIs. As medidas relativas às fases pré e pós-tratamento foram comparadas pelo teste t de Student pareado. Os grupos estudados foram comparados empregando-se ANOVA com teste Scheffé. Resultados - No grupo tratado com exodontias, ocorreu um aumento estatisticamente significante nas seguintes medidas: Is-PP, Ms-PP e SN.PP. Por outro lado, no grupo tratado sem exodontias, houve aumento significativo de: Sn-St, Is-PP, Ms-PP e SN.Gn. Em adição, houve redução significativa de PP.MsIs. Comparando-se os grupos estudados, verificou-se diferença significativa apenas para SN.PP, que foi maior no grupo tratado com exodontias. Conclusão – Os resultados evidenciaram que o tratamento ortodôntico com exodontia dos quatro pré-molares foi associado a uma rotação do plano palatino em sentido horário.

Introduction: The aim of this study is to evaluate the vertical cephalometric alterations in Brazilian females with Class II Division 1 malocclusion, treated orthodontically with and without premolar extraction. Methods - Seventy-eight lateral cephalometric radiographs of 39 white Brazilian females were assessed in the pre- and posttreatment stages. The sample was divided into two groups: with extraction of the four first premolars (n = 14) and without extractions (n = 25). The cephalometric measurements investigated were as follows: Is-St, Sn-St, Is-PP, Ms-PP, Ei, SN.GoMe, SN.Gn, SN.PP, PP.GoMe and PP.MsIs. Measurements relative to the pre- and posttreatment stages were compared by the paired Student’s-t test. The studied groups were compared using ANOVA with the Scheffé test. Results - In the group treated with extractions, there was a statistically significant increase in the following measurements: Is-PP, Ms-PP and SN.PP. On the other hand, in the group treated without extractions, Sn-St, Is-PP, Ms-PP and SN.Gn were significantly increased. Furthermore, there was a significant reduction in PP.MsIs. When comparing the studied groups, significant difference was found only for SN.PP, which was greater in the group treated with extractions. Conclusion - The results showed that orthodontic treatment with extraction of the four premolars was associated to clockwise rotation of the palatine plane.