ABSTRACT
Objective: to evaluate the marginal fit and microleakage of monolithic zirconia crowns cemented by bio-active cements (Ceramir) compared to that cemented with glass ionomer cement, and to evaluate the effect of thermocycling on marginal fit. Material and Methods: Twenty sound human molar teeth were prepared to receive monolithic zirconia crowns. Teeth were divided randomly into two equal groups according to the type of luting cement: Group I (glass ionomer cement) and group II (Ceramir cement). After cementation, the vertical marginal gap was assessed using stereomicroscope before and after thermocycling. Twenty equidistant measurement points were taken for each crown. Leakage assessment was carried out using Fuchsin dye penetration followed by digital photography under a stereomicroscope. Data were analyzed by Mann-Whitney U test to compare between the two luting cements. Wilcoxon signed-rank test was used to evaluate the effect of thermocycling on the marginal fit (P ≤ 0.05). Results: Whether before or after thermocycling, the results showed no significant difference between the marginal gap values of the two tested groups. For both groups, there was a significant increase in marginal gap values after thermocycling. Also, there was no significant difference between leakage scores of the two tested groups. Conclusion: Similarity in the physical properties and chemical composition of the two cements resulted in a nonsignificant effect on the vertical marginal fit and the extent of microleakage of translucent zirconia crowns. Thermocycling had a negative impact on the vertical marginal gap of the two tested luting agents. (AU)
Objetivo: avaliar a adapatação marginal e a microinfiltração de coroas monolíticas de zircônia cimentadas com cimentos bioativos (Ceramir) em comparação com o cimento de ionômero de vidro e avaliar o efeito da termociclagem na adaptação marginal. Material e Métodos: Vinte molares humanos sadios foram preparados para receber coroas monolíticas de zircônia. Os dentes foram divididos aleatoriamente em dois grupos iguais, de acordo com o tipo de cimento: Grupo I (cimento de ionômero de vidro) e grupo II (cimento Ceramir). Após a cimentação, a adaptação marginal vertical foi avaliada com estereomicroscópio antes e após a termociclagem. Vinte pontos de medição equidistantes foram obtidos para cada coroa. A avaliação da infiltração foi realizada utilizando a penetração do corante de fucsina, seguida de fotografia digital sob estereomicroscópio. Os dados foram analisados pelo teste de Mann-Whitney para comparação entre os dois cimentos. O teste de Wilcoxon foi usado para avaliar o efeito da termociclagem na adaptação marginal (P ≤ 0,05). Resultados: Antes ou depois da termociclagem, os resultados não mostraram diferença significativa entre os valores de fenda marginal dos dois grupos testados. Para ambos os grupos, houve um aumento significativo nos valores de fenda marginal após a termociclagem. Além disso, não houve diferença significativa entre os escores de infiltração dos dois grupos testados. Conclusão: A similaridade nas propriedades físicas e na composição química dos dois cimentos resultou em um efeito não significativo na adaptação marginal vertical e na extensão da microinfiltração de coroas translúcidas de zircônia. A termociclagem teve um impacto negativo na fenda marginal vertical dos dois agentes de cimentação testados. (AU)
Subject(s)
Humans , Zirconium , Dental Marginal Adaptation , Crowns , Dental Cements , Dental Leakage , Temperature , In Vitro Techniques , Random Allocation , Glass Ionomer Cements , MolarABSTRACT
The aim of this in vitro study was to evaluate and compare the effect of protective coating G-Coat Plus on microleakage of conventional glass ionomer cement (CGIC) and resin-modified glass ionomer cement (RMGIC) in primary molars. Materials and Methods: A total of 120 samples were divided into four groups with 30 samples in each group. Group A – teeth restored with CGIC. Group B – teeth restored with CGIC coated with G-Coat Plus. Group C – teeth restored with RMGIC. Group D – teeth restored with RMGIC coated with G-Coat Plus. Microleakage was tested using 2% basic fuschin dye penetration and measured at ×40 original magnification under the stereomicroscope. Results: The results of this in vitro study showed that coating with G-Coat Plus showed a reduction in microleakage in CGIC and complete absence of microleakage in RMGIC when compared to the noncoated groups, which was statistically significant. CGIC without G-Coat Plus showed highest microleakage followed by RMGIC without G-Coat Plus, followed by a relatively less microleakage in CGIC with G-Coat Plus. Conclusion: Significant reduction in microleakage was seen in conventional GIC and RMGIC with G-Coat Plus when compared to conventional GIC and RMGIC without G-Coat Plus.
ABSTRACT
Las lesiones cervicales no cariosas son condiciones patológicas no bacterianas localizadas en el límite amelocementario de los dientes. Los principales biomateriales descritos para el tratamiento restaurador de estas lesiones son: vidrios ionómeros, vidrios ionómeros modificados con resinas, compómeros y resinas compuestas. El objetivo de este protocolo, consiste en establecer los elementos metodológicos de una revisión sistemática que evaluará el comportamiento clínico de restauraciones cervicales realizadas con estos biomateriales. Métodos: El protocolo fue diseñado, y será reportado, en línea con Preferred Reporting Items for Systematic Reviews and Meta-Analyses Protocols (PRISMA-P 2015). Se realizará una búsqueda sensible en MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials y ClinicalTrials.gov, sin restricción por lenguaje o publicación, para identificar ensayos controlados aleatorizados que comparen dos o más tratamientos restauradores en lesiones cervicales no cariosas. Los desenlaces a evaluar serán la retención de las restauraciones y caries secundaria, según criterios RYGE/USPHS. Al menos dos investigadores realizarán de manera independiente la selección de los ensayos y la extracción de los datos. El riesgo de sesgo será evaluado utilizando la herramienta recomendada por la colaboración Cochrane. Si es posible, se realizará un metanálisis y los datos serán presentados en tablas de resúmenes de resultados mediante el método Grading of Recommendations Assesment, Development and Evaluation (GRADE). Fortalezas y debilidades: Esta revisión sistemática entregará evidencia actualizada sobre el comportamiento de cuatro biomateriales en el tratamiento de lesiones cervicales no cariosas. La principal limitación proviene de la baja cantidad o deficiencias metodológicas de los estudios primarios. Número de registro (PROSPERO): CRD42017071114.(AU)
Non-carious cervical lesions constitute a group of non-bacterial pathological conditions of the dental structure located at amelocementary junction. The main dental materials that have been described for the restorative treatment of these lesions are: ionomer glass, resin modified ionomer glass, compomers and composite resins. The objective of this protocol, is to establish the methodological elements of a systematic review, that will evaluate the clinical behavior of cervical restorations performed with four dental biomaterials. Methods: The protocol was designed, and will be reported, in line with Preferred Reporting Items for Systematic Reviews and Meta-Analyzes Protocols (PRISMA-P 2015). We will conduct a sensitive search in MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials and ClinicalTrials.gov, without language or publication restrictions, in order to identify randomized controlled trials comparing two or more restorative treatments in non-carious cervical lesions. The evaluated outcomes will be retention of restorations and secondary caries, according to RYGE/USPHS criteria. At least two reviewers will independently select studies and extract data. The risk of bias will be assessed using the tool recommended by the Cochrane Collaboration. If possible, a meta-analysis will be performed and the data will be presented in summary tables of results using the Grading of Recommendations Assesment, Development and Evaluation (GRADE) approach. Strength and Limitations: This systematic review will provide updated evidence on the behavior of four different dental biomaterials in the treatment of non-carious cervical lesions. The main limitation might arise from the low number or methodological limitations of primary studies. Register number (PROSPERO): CRD42017071114.(AU)