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1.
RFO UPF ; 25(3): 362-369, 20201231. tab
Article in Portuguese | LILACS, BBO | ID: biblio-1357815

ABSTRACT

O objetivo do presente estudo foi revisar a literatura dos últimos cinco anos e identificar os índices de sobrevivência, principais causas de falha relatadas e verificar a confiabilidade dos laminados cerâmicos como tratamento estético e funcional em longo prazo. Métodos: foi realizada uma busca ativa na Biblioteca Nacional de Medicina dos Estados Unidos (pubmed.ncbi.nlm.nih.gov), através da base de dados Medline, dos últimos cinco anos (2015-2020) na língua inglesa, utilizando os descritores: Laminate Veneers, Porcelain Laminate Veneers e Ceramic Laminate Veneers, que resultou em 35 artigos. Após a leitura dos resumos, foram excluídos 9 estudos que utilizaram laminados cerâmicos não produzidos em cerâmicas feldspáticas, ou vidro ceramizados reforçados por cristais de leucita, ou dissilicato de lítio. Foram selecionados 26 artigos categorizados como: relatos de caso, estudos clínicos, estudos in vitro e revisões de literatura. Resultados: os estudos apontaram índices de sobrevivência de 100%, após 2 anos de cimentação, até valores superiores a 80%, após 14 anos. As três principais causas de falhas apontadas foram: desadaptação de marginal (37%), pigmentação das margens (30%) e fratura ou lascamento das restaurações (3%). Considerações finais: dentro das limitações do estudo, foi possível concluir que as principais causas de falha estão associadas às margens da restauração, no entanto, os laminados cerâmicos podem atingir índices elevados de sobrevivência mesmo 14 anos após a cimentação, mostrando um alto nível de confiabilidade. (AU)


The objective of the present study was to identify the survival rate and cause of failure of ceramic laminate veneers. Methods: An active search of the last five years (2015 ­ 2020) was carried out in the United States National Library of Medicine (pubmed.ncbi.nih.gov) the MEDLINE database, in English, using the descriptors: Laminate Veneers, Porcelain Laminate Veneers and Ceramic Laminate Veneers, which resulted in 35 papers. After reading the abstracts, 9 studies that evaluated ceramic laminates that were not produced using felspathic porcelain, leucite-reinforced glass-ceramicc, or lithium disilicate glass-ceramic were excluded. Twenty-six scientific papers were selected, categorized as: Case reports, clinical studies, in vitro studies and literature reviews. Result: The studies showed survival rates between 100% after two years of cementation up to values above 80% after 14 years. The three causes of failure identified were: marginal misfit (37%), pigmentation of the margins (30%), and fracture or chipping of the restorations (3%). Final Considerations: Within the limitations of this study, it was possible to conclude that the leading causes of failure are associated with the restoration's margins. However, ceramic laminates can achieve high survival rates even 14 years after cementation, showing a high-reliability level.(AU)


Subject(s)
Humans , Dental Veneers/trends , Esthetics, Dental , Treatment Outcome , Dental Restoration Failure , Dental Porcelain
2.
São José dos Campos; s.n; 2020. 142 p. il., graf., tab..
Thesis in Portuguese | LILACS, BBO | ID: biblio-1223554

ABSTRACT

Este estudo envolve um estudo in sílico, um ensaio clínico randomizado e duas revisões sistemáticas com o objetivo de compreender a influência dos pinos de fibra (PF) na resistência à fratura de dentes tratados endodonticamente e restaurados e também, avaliar o efeito de tratamentos químicos dentinários na resistência de união da cimentação do PF na dentina intrarradicular. Estudo in silico: seis modelos tridimensionais de incisivos centrais superiores foram projetados em um software de desenho e se diferenciaram de acordo com a presença ou ausência de PF de vidro e espessura das facetas diretas de resina composta (0,5, 0,7 e 1 mm). Foram transferidos para o software ANSYS 17.2, no qual movimentos funcionais foram simulados com carga de 100 N a 45º nas faces linguais. Os modelos com PF apresentaram melhor distribuição de tensões e menores valores de tensão máxima na região da dentina e faceta. Ensaio clínico randomizado: selecionou-se 50 pacientes com necessidade de faceta em um incisivo central ou lateral superior tratado endodonticamente. Foram divididos em dois grupos (n=25) de acordo com o uso ou não de PF de vidro. Após 6 e 12 meses do tratamento, avaliações clínicas e radiográficas em relação à presença e tipo de fratura, apontaram taxas de sucesso de 96% para o grupo sem PF e 100% para o grupo com PF, sem diferenças estatisticamente significativas. Revisão sistemática e metanálise: as bases de dados PubMed, Scopus, Web of Science, LILACS, BBO, Cochrane Library e Embase foram acessadas com a estratégia de busca definida de acordo com a pergunta: ' O uso de PF influencia na resistência à fratura de dentes anteriores tratados endodonticamente e restaurados, quando comparados com o não uso de PF? ' Foram incluídos 32 estudos in vitro. Após a metanálise, pode-se concluir que o uso de PF favoreceu a resistência à fratura dos dentes, principalmente para dentes com preparo para faceta e cavidades cervicais e os PF de vidro mostraram resultados mais satisfatórios. Revisão sistemática e metanálise em rede: as bases PubMed, Scopus, Web of Science, LILACS, BBO e Cochrane Library foram acessadas com a estratégia de busca definida de acordo com a pergunta: ' Tratamentos químicos da dentina intrarradicular afetam a força de união de PF em dentes tratados endodonticamente? ' Foram incluídos 61 estudos in vitro. Foi realizada a avaliação do risco de viés para estudos in vitro. Após a metanálise em rede e análise de SUCRA para cada estratégia de cimentação (adesivo autocondicionante, adesivo de condicionamento total e cimento autoadesivo), concluiu-se que os tratamentos químicos da dentina intrarradicular que melhoram a força de união da cimentação de PF são o acetato de etila para adesivos autocondicionantes, NaOCl em baixa concentração para adesivos de condicionamento total e extrato de semente de uva para cimentos autoadesivos(AU)


This study involves an in silico study, a randomized clinical trial, and two systematic reviews to understand the influence of fiber posts (FP) on fracture strength of endodontically treated and restored teeth and also to evaluate the effect of dentin chemical treatments on bond strength of FP cementation in intraradicular dentin. In silico study: six three-dimensional models of maxillary central incisors were designed in a CAD software and differed according to the presence or absence of glass FP and thickness of composite resin direct veneer (0.5, 0.7 and 1 mm). They were transferred to the ANSYS 17.2 software, in which functional movements were simulated with a load of 100N at 45º on the lingual surfaces. The models with glass FP showed better stress distribution and lower maximum stress values in the dentin and veneer region. Randomized clinical trial: 50 patients who needed veneer treatment of an endodontically treated central or lateral maxillary incisor were selected. They were divided into two groups (n=25) according to the use or not of glass FP. Direct composite resin veneers were performed for two groups. In the FP group, they were cemented with self-adhesive resin cement. Descriptive data of the population and restored teeth were collected. After 6 and 12 months of treatment, clinical and radiographic evaluations regarding the presence and type of fracture indicated success rates of 96% for the group without FP and 100% for the group with FP, with no statistically significant differences. Systematic review and meta-analysis: PubMed, Scopus, Web of Science, LILACS, BBO, Cochrane Library and Embase databases were accessed with the search strategy defined according to the question: "Does the use of FP influence on fracture strength of endodontically treated and restored anterior teeth when compared to non-use of fiber posts?" Thirty-two in vitro studies were included. Bias risk assessment was based on existing systematic reviews of in vitro studies. After the meta-analysis, it can be concluded that the use of FP favored the fracture resistance of teeth, especially for teeth with veneer preparation and cervical cavities and the glass FP showed more satisfactory results. Systematic review and network meta-analysis: PubMed, Scopus, Web of Science, LILACS, BBO and Cochrane Library databases were accessed with the search strategy defined according to the question: 'Do intraradicular dentin chemical pretreatments affect the bond strength of fiber posts for endodontically treated teeth?' Sixty-one in vitro studies were included. Bias risk assessment for in vitro studies was performed. After network meta-analysis and SUCRA analysis for each cementation strategy (self-etching adhesive, total etching adhesive and self-adhesive cement), it was concluded that the intraradicular dentin chemical treatments that improve the bond strength of FP cementation are ethyl acetate for self-etching adhesive, low concentration NaOCl for total etching adhesives and grape seed extract for selfadhesive cements(AU)


Subject(s)
Dental Veneers/trends , Post and Core Technique , Randomized Controlled Trial , Flexural Strength/drug effects , Systematic Review
3.
Braz. oral res. (Online) ; 31(supl.1): e58, Aug. 2017. tab
Article in English | LILACS | ID: biblio-889454

ABSTRACT

Abstract The evolution of computerized systems for the production of dental restorations associated to the development of novel microstructures for ceramic materials has caused an important change in the clinical workflow for dentists and technicians, as well as in the treatment options offered to patients. New microstructures have also been developed by the industry in order to offer ceramic and composite materials with optimized properties, i.e., good mechanical properties, appropriate wear behavior and acceptable aesthetic characteristics. The objective of this literature review is to discuss the main advantages and disadvantages of the new ceramic systems and processing methods. The manuscript is divided in five parts: I) monolithic zirconia restorations; II) multilayered dental prostheses; III) new glass-ceramics; IV) polymer infiltrated ceramics; and V) novel processing technologies. Dental ceramics and processing technologies have evolved significantly in the past ten years, with most of the evolution being related to new microstructures and CAD-CAM methods. In addition, a trend towards the use of monolithic restorations has changed the way clinicians produce all-ceramic dental prostheses, since the more aesthetic multilayered restorations unfortunately are more prone to chipping or delamination. Composite materials processed via CAD-CAM have become an interesting option, as they have intermediate properties between ceramics and polymers and are more easily milled and polished.


Subject(s)
Ceramics/chemistry , Computer-Aided Design/trends , Dental Materials/chemistry , Zirconium/chemistry , Dental Prosthesis Design/trends , Dental Veneers/trends , Materials Testing , Yttrium/chemistry
4.
Rev. ADM ; 60(2): 68-71, mar.-abr. 2003. ilus
Article in Spanish | LILACS | ID: lil-350577

ABSTRACT

Se presenta un paciente femenino de 18 años e edad que acude a la Clínica de Medicina Estomatológica UASLP, con fluorosis dental, dos unidades de metal porcelana en los incisivos centrales superiores, existe opacidad en las zonas cervicales y mal ajuste en zonas marginales. Después de haber evaluado y diagnosticado de acuerdo a los principios estéticos, las coronas incorrectas y los problemas periodontales, se llevó a cabo el tratamiento mediante un recontorneado gingival y la colocación de laminados veneer. Se hace una revisión de la literatura


Subject(s)
Humans , Adolescent , Female , Dental Veneers/trends , Esthetics, Dental , Crowns , Dental Porcelain , Fluorosis, Dental , Gingivoplasty , Acid Etching, Dental/methods , Mexico , Patent , Periodontal Diseases
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