ABSTRACT
Abstract To evaluate the microtensile bond strength (µTBS) of two resin cements to 3D printed and milled CAD/CAM resins used for provisional fixed partial dentures. Blocks (5 x 5 x 5 mm) of three 3D-printed resins (Cosmos3DTemp / Yller; Resilab3D Temp / Wilcos and SmartPrint BioTemp, / MMTech) were printed (Photon, Anycubic Technology Co.). A milled material (VitaCAD-Temp, VITA) was used as control. Half the specimens were sandblasted and the rest were untreated. Two blocks were bonded with the corresponding resin cement: PanaviaV5 (Kuraray Noritake) and RelyX Ultimate (3M Oral Care). After 24 hours, the bonded blocks were sectioned into 1 x 1 mm side sticks. Half the beams were tested for µTBS and the other half was thermocycled (5000 cycles, 30s dwell-time, 5s transfer time) before µTBS testing. A four way Generalized Linear Model (material*sandblasting*cement*aging) analysis was applied. VITA exhibited the lowest µTBS, regardless of the cement, sandblasting and thermocycling. Sandblasting significantly improved the µTBS of VIT, especially after aging, but did not improve the µTBS of 3D printed resins. Sandblasting was not beneficial for 3D printed resins, although is crucial for adhesive cementation of milled temporary resins. Airborne particle abrasion affects the integrity of 3D-printed resins, without producing a benefit on the microtensile bond strength of these materials. However, sandblasting is crucial to achieve a high bond strength on milled temporary resins.
Resumen Evaluar la resistencia adhesiva en microtracción (µTBS) de dos cementos resinosos a resinas CAD/CAM impresas y fresadas indicadas para restauraciones provisionales. Bloques (5 x 5 x 5mm) de tres resinas impresas (Cosmos3DTemp / Yller; Resilab3D Temp / Wilcos and SmartPrint BioTemp, / MMTech) y una resina fresada (VitaCAD-Temp, VITA) fueron fabricados. La mitad de los especímenes fueron arenados y el resto no recibió tratamiento mecánico. Dos bloques con condiciones de tratamiento iguales fueron cementados con cemento resinoso (PanaviaV5 / Kuraray Noritake y RelyX Ultimate / 3M Oral Care). Después de 24 horas los bloques fueron seccionados en palitos de 1 mm² de área. En la mitad de los especímenes se midió la TBS inmediatamente y el resto fue termociclado (5000 ciclos, 30s remojo, 5s transferencia) antes de la prueba de TBS. Se aplica un análisis estadístico por Modelo Linear General con 4 factores (material*arenado*cemento*termociclado). La resina VITA presentó la menor µTBS, independientemente del cemento usado, el arenado y el termociclado. Sin embargo, el arenado aumentó la µTBS de VIT, especialmente después del termociclado. Por otro lado, el arenado no resultó en un aumento significativo de la µTBS de las resinas impresas. El arenado no fue beneficiosos para las resinas impresas, aunque es un paso crucial para la cementación adhesive de las resinas fresadas. El arenado afecta la integridad de las capas de las resinas impresas, sin generar un beneficio en la TBS.
Subject(s)
Computer-Aided Design/instrumentation , Resin Cements/therapeutic use , Dental Cementum , Printing, Three-Dimensional/instrumentationABSTRACT
Aim: Although bulk fill composites have been widely used as restorative material, there is no consensus regarding the best clinical protocol in terms of composite technique and adhesive system. Therefore, this clinical trial evaluated the clinical performance of bulk fill composites for class I restorations under different protocols. Methods: A randomized clinical trial including 155 class I restorations was conducted using different adhesive systems: conventional technique (phosphoric acid + conventional three-step adhesive system) (Group 1, 2 and 3); or self-etching adhesive system (Groups 4, 5 and 6). Control groups 1 and 4 were restored with conventional composite; groups 2 and 5 with low viscosity bulk fill and conventional composite as occlusal coverage; groups 3 and 6 with high viscosity bulk fill. The FDI criteria was used for clinical evaluation at baseline and after 6 months. Results: All groups showed good clinical performance. At baseline, the adhesive system did not affect postoperative hypersensitivity. After 6 months, group 5 showed a significant reduction in color and translucency; group 6 a reduction in terms of anatomical form and for postoperative sensitivity and an improvement in patient satisfaction (p<0.05). Considering the same restorative technique, the use of the self-etching adhesive system showed a significant decrease in color and translucency (p<0.05). Conclusion: All groups showed favorable clinical performance, and promising results were found for the conventional adhesive system and high viscosity bulk fill protocol
Subject(s)
Phosphoric Acids , Adhesives , Composite Resins , Dental Restoration, Permanent , Esthetics, Dental , Clinical Studies as TopicABSTRACT
Resumo Avaliou-se a insatisfação com os serviços odontológicos entre idosos brasileiros dentados e edentados e sua associação com variáveis contextuais e individuais. Foram utilizados os dados do Levantamento Nacional de Saúde bucal realizado em 2010 e dados contextuais referentes aos municípios. Análises descritivas, bivariadas e multinível foram realizadas. Incluiu-se 1.989 idosos. Destes, 11,2% dos idosos dentados e 22,1% dos edentados estavam insatisfeitos. Entre os dentados, a insatisfação foi associada com variáveis contextuais (localização do município, índice de desenvolvimento humano, Índice de GINI, presença de Centro de Especialidades Odontológicas e cobertura das equipes de saúde bucal) e individuais pertencentes à atenção à saúde e condições de saúde bucal. Para os idosos edentados, não foi identificado associação com variáveis contextuais. Apenas o motivo do uso do serviço e a satisfação com dentes e boca foram associados. Identificou-se uma prevalência considerável de insatisfação com os serviços, sendo maior entre os idosos edentados. Entre os idosos dentados, foi observado associação com variáveis contextuais.
Abstract The scope of this study was to evaluate dissatisfaction with dental services among dentate and edentulous elderly Brazilians and its association with contextual and individual variables. The data from the National Oral Health Survey conducted in 2010 and contextual variables related to cities were used. Descriptive, bivariate and multilevel analysis was conducted among 1,989 elderly individuals. Of these, 11.2% of dentate and 22.1% of edentulous elderly people were dissatisfied. Among the dentate individuals, dissatisfaction was associated with contextual variables (location of municipality, human development index, GINI Index, the presence of Dental Specialty Centers and the coverage of oral health in public service) and persons related to health care and oral health conditions. For the edentulous individuals, no associated contextual variables were identified. Only the motive for the use of the service and satisfaction with teeth and mouth were associated with dissatisfaction with dental services. A considerable prevalence of dissatisfaction with the services was identified, being higher among edentulous elderly Brazilians. Among dentate elderly Brazilians, an association with contextual variables was detected.
Subject(s)
Humans , Male , Female , Aged , Oral Health , Dental Care/statistics & numerical data , Mouth, Edentulous/therapy , Patient Satisfaction/statistics & numerical data , Quality of Health Care , Brazil , Dental Health Surveys , Multilevel Analysis , Middle AgedABSTRACT
Resumo Introdução A falta de dentição funcional compromete a qualidade de vida dos indivíduos, podendo refletir nas suas percepções, incluindo a autopercepção da necessidade de tratamento odontológico. No entanto, essa relação ainda não é bem esclarecida na literatura. Objetivo Avaliar se a falta de dentição funcional em adultos está associada à autopercepção da necessidade de tratamento odontológico. Método Foi realizado estudo transversal analítico, no qual foram utilizados dados da Pesquisa Nacional de Saúde Bucal, realizada no ano de 2010. A faixa etária avaliada foi de 35 a 44 anos. Após análise bivariada e múltipla, foi verificada a associação entre a falta de dentição funcional e outras variáveis, como a autopercepção da necessidade de tratamento, as condições sociodemográficas e os desfechos em saúde. Resultados Dos 9.564 adultos, aproximadamente 20% dos indivíduos não possuíam dentição funcional. A falta de dentição funcional foi menor em adultos que perceberam a necessidade de tratamento odontológico (OR:0,55; IC95%:0,39-0,75). O sexo feminino (OR:1,76; IC95%:1,39-2,22), a idade mais avançada (OR:2,53; IC95%:2,01-3,18) e a menor escolaridade (OR:0,82; IC95%:0,79-0,85) estavam associados à falta de dentição funcional. Conclusão A falta de dentição funcional é maior em adultos que não têm autopercepção da necessidade de tratamento odontológico.
Abstract Introduction The absence of functional dentition compromises people´s quality of life, reflecting on their perceptions, including the self-perceived need for dental treatment in adults. However, this relation is not very clear in literature. Objective To evaluate if the absence of functional dentition is associated to the self-perceived need for dental treatment in adults. Method Analytical cross-sectional study was performed, in which data of the National Oral Health Survey conducted in 2010 was used. The age group evaluated was 35 to 44 years. After bivariate and multivariate analyzes, the association between the absence of functional dentition and other variables as the self-perceived need for dental treatment, sociodemographic conditions and health endpoints was verified. Results From the 9.564 adults, approximately 20% of the individuals did not show functional dentition. The absence of functional dentition was lower in adults who were aware of the self-perceived need for dental treatment (OR:0.55; IC95%:0.39-0.75). The female gender (OR:1.76; IC95%:1.39-2.22), older age (OR:2.53; IC95%:2.01-3.18) and lower schooling (OR:0.82; IC95%:0.79-0.85) were associated with the absence of functional dentition. Conclusion The absence of functional dentition is greater in adults who do not have self-perceived need for dental treatment.
ABSTRACT
Abstract Fluoride present in toothpaste at 1,100 µg/g is considered effective on caries control. However, under high cariogenic challenge due to increasing sugar exposure, higher fluoride concentration (5,000 µg/g) could be necessary to compensate the unbalance on caries process. This was tested in a pH-cycling regimen, which evaluated the effect of fluoride concentration relative to toothpaste on reduction of enamel demineralization under conditions of two levels of cariogenic challenge. Enamel slabs (n=20) were subjected to two pH-cycling regimens, simulating 8x and 16x/day sugar exposure and were treated with solutions containing: 0 (no fluoride), 275 or 1,250 µg F/mL, resulting in 6 treatment groups: 4-h/0-F; 8-h/0-F; 4-h/275-F; 8-h/275-F; 4-h/1,250-F and 8-h/1,250-F. The 275 and 1,250 µg F/mL concentrations simulate mouth salivary dilution when 1,100 and 5,000 µg/g toothpastes are used. Enamel demineralization was assessed by surface (%SHL) and cross-sectional hardness. Fluoride taken up by enamel was also evaluated. Data were analyzed by ANOVA one-way and Tukey's test. The treatment with 1,250 µg F/mL significantly reduced %SHL compared with 275 µg F/mL (p<0.05), irrespective the level of cariogenic challenge (4-h/1,250-F vs. 4-h/275-F and 8-h/1,250-F vs 8-h/275-F comparisons, respectively). These data were supported by fluoride concentration found in enamel. These findings suggest that higher fluoride concentrations could partly compensate the greater caries risk under higher cariogenic challenge due to increasing sugar exposure.
Resumo O fluoreto presente em dentifrícios de 1,100 µg/g é considerado efetivo no controle de cárie dental. No entanto, sob alto desafio cariogênico devido ao aumento da exposição ao açúcar, maior concentração de fluoreto (5.000 µg/g) poderia ser necessária para compensar o desequilíbrio no processo de cárie. Isso foi testado em um modelo de ciclagens de pH, que avaliou o efeito da concentração do fluoreto, relacionada ao dentifrício, na redução da desmineralização do esmalte dental sob condição de dois níveis de desafio cariogênico. Blocos de esmalte (n=20) foram submetidos a dois regimes de ciclagens de pH, simulando 8 e 16 exposições diárias ao açúcar, e foram tratados com soluções contendo: 0 (sem flúor), 275 ou 1.250 µg F/mL, resultando em 6 grupos de tratamento: 4-h/0-F; 8-h/0-F; 4-h/275-F; 8-h/275-F; 4-h/1.250-F e 8-h/1.250-F. As concentrações de 275 e 1.250 µg F/mL simularam uma diluição salivar na cavidade bucal quando dentifrícios de 1100 e 5000 µg F/g são usados. A desmineralização do esmalte foi avaliada na superfície (%PDS) e dureza em corte. Fluoreto incorporado pelo esmalte também foi determinado. Os dados foram analisados por Análise de Variância e teste de Tukey. O tratamento com 1.250 µg F/mL reduziu significativamente %PDS comparado ao de 275 µg F/mL (p<0,05), independente do nível do desafio cariogênico (comparações 4-h/1,250-F x 4-h/275-F e 8-h/1,250-F x 8-h/275-F, respectivamente). Esses resultados foram suportados pela concentração de fluoreto encontrada no esmalte. Os resultados sugerem que maior concentração de fluoreto pode parcialmente compensar um maior risco de cárie sob um maior desafio cariogênico provocado pelo aumento de exposição ao açúcar.