scholarly journals Properties evaluation of silorane, low-shrinkage, non-flowable and flowable resin-based composites in dentistry

2015 ◽  
Author(s):  
Rodrigo Maia ◽  
Rodrigo S Reis ◽  
Andre FV Moro ◽  
Cesar Perez ◽  
Bárbara Pessôa ◽  
...  
Keyword(s):  
Filler Content ◽  
Important Determinant ◽  
Dental Materials ◽  
Dental Practice ◽  
Polymerization Shrinkage ◽  
Depth Of Cure ◽  
Knoop Microhardness ◽  
Properties Of Materials ◽  
Restorative Dental Materials

Purpose: This study tested the null hypothesis that different classes of direct restorative dental materials (silorane-based resin, low-shrinkage and conventional (non-flowable and flowable) resin-based composite (RBC)) do not differ from each other with regard to polymerization shrinkage, depth of cure, or microhardness. Methods: 140 RBC samples were fabricated and tested by one calibrated operator. Polymerization shrinkage was measured using a gas pycnometer both before and immediately after curing with 36 J/cm2 light energy density. Depth of cure was determined, using a penetrometer and the Knoop microhardness was tested from the top surface to a depth of 5 mm. Results: Considering polymerization shrinkage, the authors found significant differences (p<0,05) between different materials: non-flowable RBCs showed lower values, compared to flowable RBCs, with the silorane-based resin presenting the smallest shrinkage. The low shrinkage flowable composite performed similarly to non-flowable, with significant statistical differences compared to the two other flowable RBCs. Regarding to depth of cure, low-shrinkage flowable RBC were most effective compared to other groups. Microhardness was generally higher for the non-flowable vs. flowable RBCs (p<0.05). However, the values for low-shrinkage flowable did not differ significantly from those of non-flowable, but were significantly higher than those of the other flowable RBCs. Clinical Significance: RBCs have undergone many modifications as they have evolved and represent the most relevant restorative materials in today’s dental practice. This study of low-shrinkage RBCs, conventional RBCs (non-flowable and flowable) and silorane-based composite – by in vitro evaluation of volumetric shrinkage, depth of cure and microhardness – reveals that although filler content is an important determinant of polymerization shrinkage, it is not the only variable that affects properties of materials that were tested in this study.

scholarly journals Properties evaluation of silorane, low-shrinkage, non-flowable and flowable resin-based composites in dentistry

2015 ◽  
Author(s):  
Rodrigo Maia ◽  
Rodrigo S Reis ◽  
Andre FV Moro ◽  
Cesar Perez ◽  
Bárbara Pessôa ◽  
...  
Keyword(s):  
Filler Content ◽  
Important Determinant ◽  
Dental Materials ◽  
Dental Practice ◽  
Polymerization Shrinkage ◽  
Depth Of Cure ◽  
Knoop Microhardness ◽  
Properties Of Materials ◽  
Restorative Dental Materials

Purpose: This study tested the null hypothesis that different classes of direct restorative dental materials (silorane-based resin, low-shrinkage and conventional (non-flowable and flowable) resin-based composite (RBC)) do not differ from each other with regard to polymerization shrinkage, depth of cure, or microhardness. Methods: 140 RBC samples were fabricated and tested by one calibrated operator. Polymerization shrinkage was measured using a gas pycnometer both before and immediately after curing with 36 J/cm2 light energy density. Depth of cure was determined, using a penetrometer and the Knoop microhardness was tested from the top surface to a depth of 5 mm. Results: Considering polymerization shrinkage, the authors found significant differences (p<0,05) between different materials: non-flowable RBCs showed lower values, compared to flowable RBCs, with the silorane-based resin presenting the smallest shrinkage. The low shrinkage flowable composite performed similarly to non-flowable, with significant statistical differences compared to the two other flowable RBCs. Regarding to depth of cure, low-shrinkage flowable RBC were most effective compared to other groups. Microhardness was generally higher for the non-flowable vs. flowable RBCs (p<0.05). However, the values for low-shrinkage flowable did not differ significantly from those of non-flowable, but were significantly higher than those of the other flowable RBCs. Clinical Significance: RBCs have undergone many modifications as they have evolved and represent the most relevant restorative materials in today’s dental practice. This study of low-shrinkage RBCs, conventional RBCs (non-flowable and flowable) and silorane-based composite – by in vitro evaluation of volumetric shrinkage, depth of cure and microhardness – reveals that although filler content is an important determinant of polymerization shrinkage, it is not the only variable that affects properties of materials that were tested in this study.

scholarly journals Avaliação in vitro da resistência de duas resinas compostas submetidas a teste de compressão

2020 ◽  
Vol 8 (9) ◽  
Author(s):  
Mirla Lays Dantas de Almeida ◽  
Gymenna Maria Tenório Guênes ◽  
Luanna Abílio Diniz Melquiades de Medeiros ◽  
Mylena de Araújo Régis ◽  
Marcus Vinícius Lia Fook ◽  
...  
Keyword(s):  
Filler Content ◽  
State Of The Art ◽  
Resin Composite ◽  
Dental Materials ◽  
Santa Cruz ◽  
Porto Alegre ◽  
Composite State ◽  
Fernando Pessoa ◽  
Dent Assoc

Introdução: O aumento da demanda pela odontologia estética guiou o desenvolvimento de resinas compostas com melhores propriedades físicas e mecânicas. Por isso, percebe-se que há atualmente disponibilidade de uma grande variedade desse material. Dessa forma faz-se necessário a realização de estudos científicos acerca das resinas composta. Objetivo: Avaliar comparativamente, in vitro, à resistência de duas resinas compostas fotopolimerizáveis encontrados no mercado: a Filtek Z350 XT da 3M e a Zirconfill da Technw, após teste mecânico de compressão e análise estatística dos resultados. Material e método: Quatro amostras de cada resina composta foram submetidas ao teste de resistência à compressão numa máquina de ensaio universal. Os resultados foram analisados estatisticamente através do teste de Mann-Whitney com margem de erro 5.0%. Para digitar os dados e obter os cálculos estatísticos foi utilizado o programa IBM SPSS na versão 23. Resultados: A média da força foi mais elevada na resina Zirconfill do que na resina Z350; entretanto, a mediana foi mais elevada na resina Z350. Para a margem de erro fixada (5,0%) não há comprovação de diferença significativa (p > 0,05) entre as duas resinas em relação à força de resistência analisada. Conclusão: As resinas compostas testadas mostram valores de resistência a compressão semelhantes e não apresentam diferenças relevantes.Descritores: Resinas Compostas; Nanotecnologia; Odontologia.ReferênciasBowen RL. Use of epoxy resins in restorative materials. J Dent Res. 1956;35(3):360-69.Chagas LS. Avaliação da resistência flexural e módulo de elasticidade de uma resina do tipo Bulk Fill em comparação com uma resina convencional [monografia de conclusão de curso]. Santa Cruz do Sul: Universidade de Santa Cruz do Sul - UNISC; 2016.Behr M, Proff P, Kollbeck C, Langriegr S, Kunze J, Handel G et al. The bond strength of the resin-to-zirconia interface using diferente bonding concepts. J Mech Behav Biomed Mater. 2011;4(1):2-8.Rodrigues DS. Análise da porosidade, resistência mecânica e desgaste de cimentos de ionômero de vidro e resina composta [dissertação]. Porto: Faculdade de Ciências da Saúde, Universidade Fernando Pessoa; 2014.Pereira AFV, Miranda Junior WG. Avaliação in vitro da microinfiltração e adaptação marginal em restaurações classe v simulando lesões de abfração: estudo piloto. Arq Cent Estud Curso Odontol Univ Fed Minas Gerais. 2008;44(2):18-25.Ferracane JL. Resin composite – state of the art. Dent Mater. 2011; 27(1):29-38.Han JM, Lin H, Zheng G, Shinya A, Gomi H, Shinya A et al. Effect of nanofiller on wear resistance and surface roughness of resin composites. Chin J Dent Res. 2012;15(1):41-7.Mitra SB, Wu D, Holmes B. An application of nanotechnology in advanced dental materials. J Am Dent Assoc. 2003;134(10):1382-90.Mota EG, Weiss A, Spohr AM, Oshima HMS, Carvalho LMN. Relationship between filler content and selected mechanical properties of six microhybrid composites. Rev odonto cienc. 2011;26(2):151-55.Rosa RS. Propriedades mecânicas de resinas compostas com nanopartículas [tese]. Porto Alegre: Pontifícia Universidade Católica do Rio Grande do Sul, Faculdade de Odontologia; 2010.Souza ALT, Oliveira FMMPC, Moysés MR, Assis CPD, Ribeiro JCR, Dias SC. Avaliação da resistência à compressão de resinas compostas fotopolimerizáveis. Arq Odontol. 2007;43(1):30-5.

Relationship Between Shrinkage and Stress

2011 ◽  
pp. 1374-1392
Author(s):  
Antheunis Versluis ◽  
Daranee Tantbirojn
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Clinical Symptoms ◽  
Dental Materials ◽  
Vital Role ◽  
Controlling Factors ◽  
Shrinkage Stress ◽  
Polymerization Shrinkage ◽  
Multiple Factors ◽  
Restorative Dental Materials

Residual stress due to polymerization shrinkage of restorative dental materials has been associated with a number of clinical symptoms, ranging from post-operative sensitivity to secondary caries to fracture. Although the concept of shrinkage stress is intuitive, its assessment is complex. Shrinkage stress is the outcome of multiple factors. To study how they interact requires an integrating model. Finite element models have been invaluable for shrinkage stress research because they provide an integration environment to study shrinkage concepts. By retracing the advancements in shrinkage stress concepts, this chapter illustrates the vital role that finite element modeling plays in evaluating the essence of shrinkage stress and its controlling factors. The shrinkage concepts discussed in this chapter will improve clinical understanding for management of shrinkage stress, and help design and assess polymerization shrinkage research.

scholarly journals Influence of an Alkoxylation Grade of Acrylates on Shrinkage of UV-Curable Compositions

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2617 ◽  
Author(s):  
Zbigniew Czech ◽  
Janina Kabatc ◽  
Marcin Bartkowiak ◽  
Karolina Mozelewska ◽  
Dominika Kwiatkowska
Keyword(s):  
Dental Materials ◽  
Uv Curing ◽  
Inorganic Filler ◽  
Uv Curable ◽  
Polymerization Shrinkage ◽  
Restorative Materials ◽  
Recent Developments ◽  
Contraction Stress ◽  
Restorative Composites ◽  
Restorative Dental Materials

Commercially available UV curable restorative materials are composed of inorganic filler hydroxyapatite, multifunctional methacrylate, photoinitiator and alkoxylated acrylate. Especially, the application of alkoxylated monomers with different alkoxylation grade allows the reduction of polymerization shrinkage which plays the major role by application of low shrinkage composites as high quality restorative dental materials or other adhesive materials in the form of UV-polymerized self-adhesive acrylics layers (films). There are several ways to reduce polymerization shrinkage of restorative compositions, for example, by adjusting different alkoxylated acrylic monomers, which are integral part of investigated UV curable restorative composites. This article is focused on the studies of contraction-stress measured as shrinkage during UV-initiated curing of restorative composites containing various commercially available alkoxylated acrylates. Moreover, studies with experimental restorative materials and recent developments typical for UV curing technology using special photoreactive monomers are described.

Relationship Between Shrinkage and Stress

2010 ◽  
pp. 45-64 ◽  
Author(s):  
Antheunis Versluis ◽  
Daranee Tantbirojn
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Clinical Symptoms ◽  
Dental Materials ◽  
Vital Role ◽  
Controlling Factors ◽  
Shrinkage Stress ◽  
Polymerization Shrinkage ◽  
Multiple Factors ◽  
Restorative Dental Materials

Residual stress due to polymerization shrinkage of restorative dental materials has been associated with a number of clinical symptoms, ranging from post-operative sensitivity to secondary caries to fracture. Although the concept of shrinkage stress is intuitive, its assessment is complex. Shrinkage stress is the outcome of multiple factors. To study how they interact requires an integrating model. Finite element models have been invaluable for shrinkage stress research because they provide an integration environment to study shrinkage concepts. By retracing the advancements in shrinkage stress concepts, this chapter illustrates the vital role that finite element modeling plays in evaluating the essence of shrinkage stress and its controlling factors. The shrinkage concepts discussed in this chapter will improve clinical understanding for management of shrinkage stress, and help design and assess polymerization shrinkage research.

In Vitro Evaluation of Surface Roughness and Microhardness of Restorative Materials Submitted to Erosive Challenges

2011 ◽  
Vol 36 (4) ◽  
pp. 397-402 ◽  
Author(s):  
ALF Briso ◽  
LP Caruzo ◽  
APA Guedes ◽  
A Catelan ◽  
PH dos Santos
Keyword(s):  
Surface Roughness ◽  
Clinical Relevance ◽  
Dental Materials ◽  
Dental Erosion ◽  
In Vitro Evaluation ◽  
Acidic Solutions ◽  
Restorative Materials ◽  
Restorative Dental Materials ◽  
Surface Sealant

Clinical Relevance The effects of dental erosion caused by acidic solutions on the surface of restorative dental materials could be minimized by the application of a surface sealant.

scholarly journals Do dual-cure bulk-fill resin composites reduce gaps and improve depth of cure

2021 ◽  
Vol 32 (5) ◽  
pp. 77-86
Author(s):  
May Anny Alves Fraga ◽  
Lourenço Correr-Sobrinho ◽  
Mário Alexandre Coelho Sinhoreti ◽  
Talita Malini Carletti ◽  
Américo Bortolazzo Correr
Keyword(s):  
Computed Tomography ◽  
In Vitro Study ◽  
Resin Composites ◽  
Third Molars ◽  
Micro Computed Tomography ◽  
Depth Of Cure ◽  
Microhardness Data ◽  
Knoop Microhardness ◽  
Made In

Abstract This in vitro study aimed to evaluate the gaps length and depth of cure of dual-cure bulk-fill resin composites inserted in box-shaped preparations. Box-shaped preparations (4 mm deep) were made in fifteen human third-molars and divided into three groups according to the resin composites (n=5): Dual-cure bulk-fill BulkEZ (BEZ); Dual-cure bulk-fill HyperFIL (HF); and Tetric Evoceram Bulk-fill (TETRIC), as control. Gaps length (%) was evaluated in tooth-restoration interface with micro-computed tomography (µCT). The restorations were sectioned, and the degree of conversion (DC) and Knoop microhardness were evaluated at five depths (0.3, 1, 2, 3, and 4 mm). Microhardness data were statistically evaluated using absolute values (KHN) and relative values (microhardness percentages in relation to top). Gaps length (%) increased in the following order: BEZ=TETRIC<HF. The microhardness percentages in relation to top significantly decreased from 2 mm for TETRIC and 3 mm for HF. BEZ had constant microhardness and DC at all depths, while HF and TETRIC presented a significant decrease on DC at 4 mm. Dual-cure bulk-fill composites did not reduce gaps compared to light-cure bulk-fill, but they can improve depth of cure of bulk-filled restorations.

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