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Frasnelli GD, Leoni GB, Cassani R, Faria ACL, Gomes EA, Moris ICM. Effect of different ceramic systems on antagonist dental structure by microtomographic analysis. Dent Mater 2024; 40:118-123. [PMID: 37940499 DOI: 10.1016/j.dental.2023.10.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 10/19/2023] [Accepted: 10/25/2023] [Indexed: 11/10/2023]
Abstract
OBJECTIVES This study aims to identify the two-dimensional and three-dimensional analyses and evaluate the loss of tooth structure in the tooth's different constituent elements and the ceramic antagonist's surface. METHODS In this study, three groups (n = 10) represented by different ceramic systems (lithium disilicate [GDis], lithium silicate reinforced with zirconia [GSil], and monolithic zirconia [GZir]) were evaluated. Each group obtained ten ceramic blocks and submitted them to the sintering/crystallization process. To carry out the wear test, healthy mandibular premolars were used as the specimens and the ceramic blocks as antagonists. The premolars were submitted to two-dimensional and three-dimensional analyses using a computerized microtomography (µTC) before and after the wear test. The wear test was performed with 30 N and 300,000 cycles load, with occlusion, laterality, and disocclusion movements. RESULTS The statistical analysis comparing the loss of two-dimensional tooth structure showed a statistically significant difference among all groups (p < 0.05). Statistical analysis comparing the percentage of loss of three-dimensional tooth structure showed a statistically significant difference between groups GDis and GSil and between groups GDis and GZir. However, when comparing GSil with GZir, no statistically significant difference was found. The qualitative analysis of the teeth showed that GDis showed considerable enamel loss and dentin exposure, GSil showed enamel wear with flattening the cusp without dentin exposure, and GZir showed minimal enamel wear without dentin exposure. In the qualitative analysis of ceramic antagonists, more significant wear of the ceramic material for GDis was observed, followed by the GSil and GZir groups, respectively. SIGNIFICANCE The use of the lithium disilicate should be cautious, restricting it to areas with lower masticatory forces. Areas of higher masticatory forces showed a large amount of antagonist wear, with dentin involvement. This can lead to dentinal hypersensitivity, risk of compromising patients' occlusion, by harming group disocclusion guides, causing pain and temporomandibular disorders.
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Affiliation(s)
| | | | - Raquel Cassani
- School of Dentistry, University of Ribeirão Preto (UNAERP), Ribeirão Preto, SP, Brazil
| | | | - Erica Alves Gomes
- School of Dentistry, University of Ribeirão Preto (UNAERP), Ribeirão Preto, SP, Brazil
| | - Izabela C M Moris
- School of Dentistry, University of Ribeirão Preto (UNAERP), Ribeirão Preto, SP, Brazil.
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de Freitas BN, Tonin BSH, Zaparolli D, Faria ACL, Toniollo MB, Ribeiro RF, Macedo AP. Mechanical comparison of milled fiber-reinforced resin composite and Co-Cr frameworks with different connector cross-sectional geometries: An in vitro study. J Mech Behav Biomed Mater 2023; 141:105759. [PMID: 36905707 DOI: 10.1016/j.jmbbm.2023.105759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 03/01/2023] [Accepted: 03/03/2023] [Indexed: 03/08/2023]
Abstract
This study compared the effect of using milled fiber-reinforced resin composite and Co-Cr (milled wax and lost-wax technique) frameworks for 4-unit implant-supported partial fixed dental prostheses; and also, evaluated the influence of the connector's cross-sectional geometries on the mechanical behavior. Three groups of milled fiber-reinforced resin composite (TRINIA) for 4-unit implant-supported frameworks (n = 10) with three connectors geometries (round, square, or trapezoid), and three groups of Co-Cr alloy frameworks manufactured by milled wax/lost wax and casting technique, were analyzed. The marginal adaptation was measured before cementation using an optical microscope. Then, the samples were cemented, thermomechanical cycled (load of 100 N/2 Hz, 106 cycles; 5, 37, and 55 ᵒC, a total of 926 cycles at each one), and cementation and flexure strength (maximum force) analyzed. Analysis of stress distribution in framework veneered considering resin and ceramic properties for fiber-reinforced and Co-Cr frameworks, respectively, implant, and bone was by finite element analysis under three contact points (100 N) on the central region. ANOVA and Multiple paired test-t with Bonferroni adjustment (α = 0.05) were used for data analysis. Fiber-reinforced frameworks showed better vertical adaptation (mean ranged from 26.24 to 81.48 μm) compared to the Co-Cr frameworks (mean ranged from 64.11 to 98.12 μm), contrary to horizontal adaptation (respectively, means ranged from 281.94 to 305.38 μm; and from 150.70 to 174.82 μm). There were no failures during the thermomechanical test. Cementation strength showed three times higher for Co-Cr compared to fiber-reinforced framework, as well as flexural strength (P < .001). Regarding stress distribution, fiber-reinforced had a pattern of concentration in the implant-abutment complex. There were no significant differences in stress values or changes observed among the different connector geometries or framework materials. Trapezoid connector geometry had a worse performance for marginal adaptation, cementation (fiber-reinforced 132.41 N; Co-Cr 255.68 N) and flexural strength (fiber-reinforced 222.57 N; Co-Cr 614.27 N). Although the fiber-reinforced framework showed lower cementation and flexural strength, considering the stress distribution values and absence of failures in the thermomechanical cycling test, it can be considered for use as a framework for 4-unit implant-supported partial fixed dental prostheses in the posterior mandible. Besides, results suggest that trapezoid connectors mechanical behavior did not perform well compared to round or square geometries.
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Affiliation(s)
- Bruna Neves de Freitas
- University of São Paulo, School of Dentistry of Ribeirão Preto, Department of Dental Materials and Prosthodontics, Ave. Café, Monte Alegre, Ribeirão Preto, São Paulo, 14040-904, Brazil.
| | - Bruna Santos Honório Tonin
- University of São Paulo, School of Dentistry of Ribeirão Preto, Department of Dental Materials and Prosthodontics, Ave. Café, Monte Alegre, Ribeirão Preto, São Paulo, 14040-904, Brazil.
| | - Danilo Zaparolli
- University of São Paulo, School of Dentistry of Ribeirão Preto, Department of Dental Materials and Prosthodontics, Ave. Café, Monte Alegre, Ribeirão Preto, São Paulo, 14040-904, Brazil.
| | - Adriana Claudia Lapria Faria
- University of São Paulo, School of Dentistry of Ribeirão Preto, Department of Dental Materials and Prosthodontics, Ave. Café, Monte Alegre, Ribeirão Preto, São Paulo, 14040-904, Brazil.
| | - Marcelo Bighetti Toniollo
- Dental School of Rio Verde, University of Rio Verde, Fazenda Fontes do Saber, Rio Verde, Goiás, 75901-970, Brazil.
| | - Ricardo Faria Ribeiro
- University of São Paulo, School of Dentistry of Ribeirão Preto, Department of Dental Materials and Prosthodontics, Ave. Café, Monte Alegre, Ribeirão Preto, São Paulo, 14040-904, Brazil.
| | - Ana Paula Macedo
- University of São Paulo, School of Dentistry of Ribeirão Preto, Department of Dental Materials and Prosthodontics, Ave. Café, Monte Alegre, Ribeirão Preto, São Paulo, 14040-904, Brazil.
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Ribeiro RF, Oliveira DF, Tovani CB, Ramos AP, Borges AFS, Faria ACL, de Almeida RP, Rodrigues RCS. Y-TZP Physicochemical Properties Conditioned with ZrO 2 and SiO 2 Nanofilms and Bond Strength to Dual Resin Cement. Materials (Basel) 2022; 15:7905. [PMID: 36431390 PMCID: PMC9694964 DOI: 10.3390/ma15227905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 10/24/2022] [Accepted: 11/07/2022] [Indexed: 06/16/2023]
Abstract
Commercial Yttria-tetragonal zirconia polycrystalline (Y-TZP) was subjected to surface treatments, and the bond strength of dual resin cement to Y-TZP and failure modes were evaluated. Disks (12 mm × 2 mm), cylinders (7 mm × 3.3 mm), and bars (25 mm × 5 mm × 2 mm) were milled from Y-TZP CAD-CAM blocks, divided into seven groups, and subjected to different surface treatments; silicatization was used as control. On the basis of the literature, this study evaluated modifications with films containing SiO2 nanoparticles and silane; SiO2+ZrO2—SiO2 (50%) and ZrO2 (50%) nanoparticles, SiO2+ZrO2/Silane-SiO2 (50%) and ZrO2 (50%) nanoparticles, and silane. Specimens were analyzed by wettability (n = 3), surface free energy (n = 3), X-ray diffraction (n = 1), Fourier transform infrared spectroscopy (FTIR) (n = 1), roughness (n = 5), shear bond test (n = 10), and dynamic modulus (n = 3). Specimens treated with hydrofluoric acid—HF 40% presented significantly higher contact angle and lowest surface free energy (p < 0.05). The SiO2/Silane presented crystalline SiO2 on the surface. The surface roughness was significantly higher for groups treated with nanofilms (p < 0.05). Shear bond strength was significantly higher for silicatization, HF 40%/silicatization, SiO2/Silane, and SiO2+ZrO2/Silane groups. The proposed treatments with nanofilms had potentially good results without prejudice to the physicochemical characteristics of zirconia. Generally, groups that underwent silica surface deposition and silanization had better bond strength (p < 0.005).
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Affiliation(s)
- Ricardo Faria Ribeiro
- Department of Dental Materials and Prosthodontics, Ribeirao Preto School of Dentistry, University of Sao Paulo-FORP-USP, Ribeirao Preto 14040-904, SP, Brazil
| | - Danilo Flamini Oliveira
- Department of Dental Materials and Prosthodontics, Ribeirao Preto School of Dentistry, University of Sao Paulo-FORP-USP, Ribeirao Preto 14040-904, SP, Brazil
| | - Camila Bussola Tovani
- Department of Chemistry, Faculty of Philosophy, Sciences and Letters at Ribeirao Preto, University of Sao Paulo-FFCLRP-USP, Ribeirao Preto 14040-901, SP, Brazil
| | - Ana Paula Ramos
- Department of Chemistry, Faculty of Philosophy, Sciences and Letters at Ribeirao Preto, University of Sao Paulo-FFCLRP-USP, Ribeirao Preto 14040-901, SP, Brazil
| | - Ana Flavia Sanches Borges
- Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of Sao Paulo-FOB/USP, Bauru 17012-901, SP, Brazil
| | - Adriana Claudia Lapria Faria
- Department of Dental Materials and Prosthodontics, Ribeirao Preto School of Dentistry, University of Sao Paulo-FORP-USP, Ribeirao Preto 14040-904, SP, Brazil
| | - Rossana Pereira de Almeida
- Department of Dental Materials and Prosthodontics, Ribeirao Preto School of Dentistry, University of Sao Paulo-FORP-USP, Ribeirao Preto 14040-904, SP, Brazil
| | - Renata Cristina Silveira Rodrigues
- Department of Dental Materials and Prosthodontics, Ribeirao Preto School of Dentistry, University of Sao Paulo-FORP-USP, Ribeirao Preto 14040-904, SP, Brazil
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da Silva AO, Fiorin L, Faria ACL, Ribeiro RF, Rodrigues RCS. Translucency and mechanical behavior of partially stabilized monolithic zirconia after staining, finishing procedures and artificial aging. Sci Rep 2022; 12:16094. [PMID: 36167885 PMCID: PMC9515067 DOI: 10.1038/s41598-022-20120-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 09/08/2022] [Indexed: 11/09/2022] Open
Abstract
Partially stabilized zirconia (5Y-PSZ) has been widely used to manufacture indirect monolithic restorations, and the effect of finishing procedures on the optical and mechanical properties of these materials are still unclear. The purpose of this study was to evaluate the effect of staining, polishing and glazing on surface roughness, crystalline phase content, microhardness, fracture toughness, dynamic elastic modulus, three-point flexural strength, strain distribution, color (∆E00/∆L/∆a/∆b), and translucency before and after artificial accelerated aging (water spray and ultraviolet) of 5Y-PSZ. Bar-shaped and rectangle-shaped specimens of the 5Y-PSZ were prepared and divided into six groups, according to finishing procedure: GC (control), GS (staining), GG (glazing), GSG (staining and glazing), GP (polishing), GSP (staining and polishing). There was a significant difference between groups for surface roughness (p < 0.05), dynamic elastic modulus (p = 0.007), microhardness (p = < 0.05), ∆E00 (p = 0.010), and ∆a (p = 0.008). GC presented higher cubic phase content, and the stained groups (GS, GSG and GSP) presented higher monoclinic content. The different finishing procedures affected roughness, dynamic elastic modulus, microhardness, and color of 5Y-PSZ; polishing being the finish that provides minors changes to the 5Y- PSZ. Accelerated artificial aging caused color change, regardless of finishing procedure used.
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Affiliation(s)
- Allan Oliveira da Silva
- Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, SP, Brazil
| | - Lívia Fiorin
- Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, SP, Brazil
| | - Adriana Claudia Lapria Faria
- Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, SP, Brazil
| | - Ricardo Faria Ribeiro
- Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, SP, Brazil
| | - Renata Cristina Silveira Rodrigues
- Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo (USP), Av. do Café, s/n, Ribeirão Preto, SP, 14040-904, Brazil.
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Oliveira DF, Tovani CB, Faria ACL, Borges AFS, Ramos AP, Rodrigues RCS, Ribeiro RF. Efeitos de Diferentes Tratamentos de Superfície nas Características Superficiais e Resistência Adesiva da Zircônia Odontológica. J Health Scie 2018. [DOI: 10.17921/2447-8938.2017v19n5p206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
O objetivo do estudo foi analisar características superficiais da zircônia, modificada superficialmente, por microscopia eletrônica de varredura (MEV), molhabilidade, energia de superfície, difração de raios x (DRX) e rugosidade superficial (Ra) e comparar a efetividade dos tratamentos na qualidade adesiva do material. Discos de zircônia foram distribuídos em sete grupos (n6): G1 (Rocatec), G2 (ácido hidrofluorídrico 40%, 210 segundos), G3 (ácido hidrofluorídrico 40%, 210 segundos + Rocatec), G4 (nanopartículas ZrO2), G5 (nanopartículas SiO2), G6 (nanopartículas SiO2 + ZrO2), G7 (nanopartículas SiO2 + ZrO2 + silano). Uma amostra por grupo (n1) foi analisada por DRX e MEV pós-tratamento e as demais, submetidas a microscopia confocal a laser (n5) para determinação da Ra. Sobre cada disco tratado foram cimentados 2 cilindros também de zircônia para teste de cisalhamento. Molhabilidade e energia de superfície foram desenvolvidas em triplicata (n3). G1, G3, G5 e G7 apresentaram valores de resistência ao cisalhamento superiores aos demais. (p<0,05). G5 e G7 apresentaram os maiores valores de Ra. Imagens em MEV mostraram modificações de superfície em todos os grupos. Em DRX, não houve alteração de fases da zircônia tratada. G1 e G3 apresentaram os menores ângulos de contato e G2, menor energia de superfície, sendo os demais estatisticamente semelhantes. Tratamentos que depositam sílica superficial são eficazes para união adesiva da zircônia. Nanopartículas de sílica parecem promissoras para o favorecimento da adesão em zircônia.Palavras-chave: Zircônio. Materiais Dentários. Nanopartículas.
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Rodrigues RCS, Faria ACL, Orsi IA, Mattos MDGCD, Macedo AP, Ribeiro RF. Comparative study of two commercially pure titanium casting methods. J Appl Oral Sci 2011; 18:487-92. [PMID: 21085805 PMCID: PMC4246380 DOI: 10.1590/s1678-77572010000500010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2009] [Accepted: 02/16/2010] [Indexed: 11/21/2022] Open
Abstract
The interest in using titanium to fabricate removable partial denture (RPD)
frameworks has increased, but there are few studies evaluating the effects of casting
methods on clasp behavior.
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