ABSTRACT
PURPOSE: To evaluate the effect of different cleaning media on the adhesion of resin cement to feldspathic ceramic after etching. MATERIALS AND METHODS: The cementation surfaces of ceramic blocks (N = 20, n = 5 per group) were etched with 10% hydrofluoric acid (HF) gel for 20 s and rinsed for 60 s. They were then randomly assigned to 4 groups: G1: air-water spray+drying (control); G2: ultrasonic cleaning in distilled water for 4 min+drying; G3: ultrasonic cleaning in 99.5% acetone for 4 min+drying; G4: ultrasonic cleaning in 70% alcohol for 4 min+drying. The ceramic blocks were silanized and cemented (RelyX ARC) to the composite blocks. Subsequently, the microtensile bond strength test (µTBS) was performed. In addition, EDS analysis was made to assess the elemental composition of the conditioned and cleaned ceramic surfaces. RESULTS: A significantly higher mean µTBS was obtained when specimens had been ultrasonically cleaned in distilled water (G2: 18.8 ± 0.4 MPa) (p < 0.05) compared to other groups (G1: 16.6 ± 0.5; G3: 16.1 ± 0.9; G4: 15.8 ± 1.4) (one-way ANOVA). EDS analysis indicated the presence of F- only in G1. Dissolved precipitates after HF etching were removed by ultrasonic cleaning. CONCLUSION: Cleaning the HF-etched ceramic surface ultrasonically in distilled water is recommended, instead of rinsing it with air-water spray only.
Subject(s)
Dental Bonding , Dental Porcelain , Detergents , Resin Cements , Ultrasonics , Acid Etching, Dental , Adhesiveness , Dental Stress Analysis , Random Allocation , Tensile Strength , WaterABSTRACT
Proposição: Avaliar o conhecimento dos usuários da Faculdade de Odontologia da UFJF em relação às medidas de radioproteção que devem ser adotadas durante a obtenção de radiografias. Métodos: Cem pacientes responderam a um questionário sobre a experiência como usuários de serviços de Radiologia bem como sobre o conhecimento em relação às medidas de radioproteção. Resultados: Oitenta e cinco por cento dos participantes já realizaram radiografias odontológicas, sendo que para 61,2%, sempre foi oferecido avental de chumbo. Por outro lado, em relação ao protetor de tireoide, em apenas 24,7% dos participantes este aparato foi utilizado rotineiramente. Durante a realização de radiografias intrabucais, 43,5% relataram que foram utilizados posicionadores para manutenção do filme na cavidade bucal. Sete participantes já haviam permanecido como acompanhantes, e apenas um afirmou sempre ter utilizado avental de chumbo durante essa função. Mais de 39% das participantes nunca havia sido questionada sobre a possibilidade de estar grávida. Do total de pacientes entrevistados, 53% consideram a radiação X perigosa, e 49% acham que, durante a exposição, correm algum risco. Conclusão: Apesar de ainda haver negligência em relação aos procedimentos de radioproteção durante a obtenção de radiografias odontológicas, a maioria dos pacientes reconhece os perigos associados à utilização da radiação X.
Purpose: To evaluate the users' knowledge of UFJF School of Odontology in terms of radiation protection measures to be adopted while taking X-rays. Methods: One hundred patients answered a questionnaire about their experience as users of Radiology services, as well as on knowledge about radiation protection measures. Results: Eighty-five percent of the participants had taken dental X-rays and a lead apron was offered to 61.2%. In relation to the thyroid shield, in only 24.7% of cases was this apparatus used routinely. For intraoral radiographs, 43.5% reported that positioners were used to keep the film in the oral cavity. Seven participants had already remained as companions, and only one said to have always used a lead apron for this function. More than 39% of the female participants had never been questioned about the possibility of being pregnant. Of the participants interviewed, 53% considered X-rays dangerous and 49% believed that exposure incurred some risk. Conclusion: Although there is still neglect of radiation protection procedures while obtaining dental radiographs, most patients recognize the dangers associated with the use of X-rays.
Subject(s)
Radiographic Image Enhancement , Resin Cements , X-Rays , Dental Cements , Dental Enamel , Dentin , Light-Curing of Dental AdhesivesABSTRACT
This study evaluated the influence of heat treatment (HT) of the silane on the microtensile bond strength of resin cement to a feldspathic ceramic. Ceramic (VITA VM7) and composite blocks (N=32) were divided into four groups (n=6 for bond test, n=2 for SEM) at random and subject to following sequence of conditioning: G1: HF 9.6%+Silane+Panavia F2.0, G2: HF 9.6%+Silane+HT+Panavia F2.0, G3: Silane+HT+Panavia F2.0, and G4: Silane+Panavia F2.0. HT was performed in an oven (100°C, 2 minutes). G1 (17.6±2.3 MPa) and G2 (19±3.2 MPa) showed significantly higher mean bond strength than those of G3 (9.1±2.8 MPa) and G4 (10.9±1.8 MPa). SEM analysis showed exclusively mixed failures. Silane HT did not increase the bond strength.
Subject(s)
Aluminum Silicates/chemistry , Dental Bonding/methods , Dental Porcelain/chemistry , Potassium Compounds/chemistry , Resin Cements/chemistry , Silanes/chemistry , Acid Etching, Dental/methods , Adhesiveness , Ceramics/chemistry , Composite Resins/chemistry , Dental Materials/chemistry , Dental Stress Analysis/instrumentation , Hot Temperature , Humans , Hydrofluoric Acid/chemistry , Materials Testing , Microscopy, Electron, Scanning , Spectrometry, X-Ray Emission , Stress, Mechanical , Surface Properties , Tensile StrengthABSTRACT
O objetivo deste estudo foi descrever um caso clínico de Cisto Periodontal Lateral encontrado em uma paciente de 47 anos, que foi confirmado por exames radiográfico e histopatológico. O Cisto Periodontal Lateral é um tipo raro de cisto odontogênico de desenvolvimento, não ceratinizado, que ocorre adjacente ou lateral a uma raiz dentária de dente vital e corresponde a 1,5% dos cistos dos maxilares. É encontrado principalmente em adultos entre a 5ª e a 7ª décadas de vida, sem distinção quanto ao sexo. Sem sinais dolorosos ou sintomas clínicos, são normalmente diagnosticados durante exames radiográficos de rotina, porém, para um diagnóstico correto é preciso também avaliar as características histopatológicas. O tratamento se faz por enucleação cirúrgica. Apesar de não tender à recorrência, recomenda-se a proservação por alguns anos.
The objective of this study was to describe a clinical case of Lateral Periodontal Cyst found in a 47 year-old patient, which was confirmed by radiographic and histopathologic examinations. The Lateral Periodontal Cyst is a rare type of odontogenic cyst of development, not keratinized, adjacent or lateral to a root of vital tooth and corresponds to 1.5% of cysts in jaws. It is found mainly in adults between 5 th and 7 th decades, without distinction related to sex. With no painful signs or clinical symptoms, these cyst are usually diagnosed during a routine radiographic examination, however, for a correct diagnosis, the histopathologic characteristics must be assessed. The treatment is done by enucleating surgery. Although there is no trend to recurrence, it is recommended to follow-up for some years.