The aim of this in vitro study was to evaluate qualitatively the surface morphology of enamel bleached with 35% hydrogen peroxide (HP) followed by application of fluoridated agents. Forty intact pre molars were randomly distributed into four groups (n = 10), treated as follows: Group I (control group) remained stored in artificial saliva at 37 °C, Group II - 35% HP; Group III - 35% HP + acidulated fluoride (1.23%) and Group IV - 35% HP + neutral fluoride (2%). The experimental groups received three applications of bleaching gel and after the last application all specimens were polished. This procedure was repeated after 7 and 14 days, and during the intervals of applications, the specimens were stored in artificial saliva at 37°C. Scanning electron microscopy (SEM) analysis showed superficial irregularities and porosities to varying degrees in bleached enamel compared to control group. Sample evaluation was made by attributing scores, and data were statistically analyzed using Kruskal-Wallis and Dunn tests (P < 0.05). SEM qualitative investigation demonstrated that 35% hydrogen peroxide affected human dental enamel morphology, producing porosities, depressions, and superficial irregularities at various degrees. These morphological changes were higher after the application of 1.23% acidulated fluoride gel.
The aim of this study was to evaluate the performance of two different glass-ionomer cements: a high-density (Ketac Molar - ESPE) and a resin-modified cement (Fuji VIII - GC) using the Atraumatic Restorative Treatment technique to restore multisurface cavities in permanent teeth. A total of 60 ART restorations (30 with each material) were placed in schoolchildren (9-16 years of age) by two operators. After a period of 6 months, two independent examiners evaluated 59 restorations according to the criteria used in previous ART studies. Data were submitted to McNemar and Fischer tests. The success rate of the treatment was 98.3%. One restoration (Ketac Molar) was replaced by another material and was recorded as failure. The success rates of the restorations were 100% and 96.6% for Fuji VIII and Ketac Molar, respectively. There was no statistically significant difference in the restorations success between baseline and 6 months (p>0.05). In the same way, no significant differences were found between materials, cavity types or operators (p>0.05). The ART approach was highly appropriate and effective in restorations involving two or more tooth surfaces, after 6 months. The results showed a promising performance of the ART technique with both materials.
The purpose of this study was to evaluate the microhardness of resin-based materials polymerized with a LED (light-emitting diode) light-curing unit (LCU) and a halogen LCU. Twenty cylindrical specimens (3.0 mm in diameter and 2.0 mm high) were prepared for each tested material (Z100, Definite and Dyract). Specimens were light-cured with two LCUs (Ultraled and Curing Light 2500) for either 40 or 60 s on their top surfaces. Hardness was measured on top and bottom surfaces of each specimen. Statistical analysis was done by ANOVA and Tukey's test (p<0.05). There was no significant difference in hardness between LED LCU and halogen LCU for Z100 and Dyract on top surface. Conversely, lower hardness was recorded when Definite was light-cured with the LED LCU than with the halogen lamp. On bottom surface, hardness was significantly lower for all materials light-cured with LED LCU. Z100 was harder than Dyract and Definite regardless of the light curing unit. There was no significant difference in hardness between the exposure times on top surface. Higher hardness was obtained when the materials were light-cured for 60 s on bottom surface. The tested LED was not able to produce the same microhardness of resin-based materials as the halogen LCU.
IADR-International Association for Dental Research, desde 1999. iii "Eu tenho uma espécie de dever de sonhar, "Eu tenho uma espécie de dever de sonhar, de SONHAR SEMPRE, de SONHAR SEMPRE, pois sendo mais do que um espectador de mim mesmo, pois sendo mais do que um espectador de mim mesmo, eu tenho que ter o melhor espetáculo que posso. eu tenho que ter o melhor espetáculo que posso. E assim me construo a ouro e sedas. E assim me construo a ouro e sedas. Em salas supostas, invento palco, cenário para viver o meu sonho entre luzes brandas e músicas Em salas supostas, invento palco, cenário para viver o meu sonho entre luzes brandas e músicas invisíveis." invisíveis." (Fernando Pessoa) (Fernando Pessoa) iv PEGADAS NO CAMINHO PEGADAS NO CAMINHO Certa noite, um homem sonhava que caminhava pela praia, passo a passo com o Senhor. Certa noite, um homem sonhava que caminhava pela praia, passo a passo com o Senhor. Na tela do céu, revia cenas de sua vida. Percebeu, em cada cena, dois pares de pegadas na areia: Na tela do céu, revia cenas de sua vida. Percebeu, em cada cena, dois pares de pegadas na areia: um par seu e outro do Senhor. Tendo revisto a sua vida, cena por cena, no espelho do céu, voltou-se para ver um par seu e outro do Senhor. Tendo revisto a sua vida, cena por cena, no espelho do céu, voltou-se para ver as pegadas na areia e notou que, ao longo de sua vida, muitas vezes havia apenas um par de pegadas. Apenas as pegadas na areia e notou que, ao longo de sua vida, muitas vezes havia apenas um par de pegadas. Apenas um par! E justamente nos momentos mais tristes ou difíceis! um par! E justamente nos momentos mais tristes ou difíceis! ___ Senhor!-disse o homem-Vós dissestes que andaríeis comigo sempre e sempre, se eu vos seguisse. Vejo, ___ Senhor!-disse o homem-Vós dissestes que andaríeis comigo sempre e sempre, se eu vos seguisse. Vejo, entretanto, que há apenas um par de pegadas no caminho enquanto duraram os tempos mais difíceis da minha entretanto, que há apenas um par de pegadas no caminho enquanto duraram os tempos mais difíceis da minha vida. Não compreendo porque o meu SENHOR me abandonou, exatamente, quando eu mais necessitava. vida. Não compreendo porque o meu SENHOR me abandonou, exatamente, quando eu mais necessitava. E o Senhor replicou: E o Senhor replicou: ___ Meu filho, meu amado filho, ___ Meu filho, meu amado filho, o meu amor não te deixaria nunca! o meu amor não te deixaria nunca! Onde vês apenas um par de pegadas, Onde vês apenas um par de pegadas, Ali te levava em Meus braços. Ali te levava em Meus braços. A DEUS, A DEUS, Que sempre me carregou Que sempre me carregou quando não conseguia andar; quando não conseguia andar; Me conduziu Me conduziu quando estava cega; quando estava cega; Me abriu os olhos Me abriu os olhos quando estava errada; quando estava errada; Permaneceu ao meu lado, Permaneceu ao meu lado, mesmo quando não o percebia... mesmo quando não o percebia...
This study evaluated the survival of class III and V restorations using the atraumatic restorative treatment (ART) approach in permanent anterior teeth, after 3 years. A total of 151 restorations were performed in 60 patients. After 3 years, 107 restorations (47 patients) were evaluated. Data were analyzed using exact 95% confidence interval. A total of 97 restorations (91% with 95% CI = 83–99), 76 class III (92% with 95% CI = 82–100) and 21 class V (88% with 95% CI = 77–98) were classified as successful. The survival rate of the ART approach in class III and V restorations in permanent anterior teeth was considered high.
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