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Ortensi L, Grande F, Testa C, Balma AM, Pedraza R, Mussano F, La Rosa GRM, Pedullà E. Fracture strength of 3-units fixed partial dentures fabricated with metal-ceramic, graphene doped PMMA and PMMA before and after ageing: An in-vitro study. J Dent 2024; 142:104865. [PMID: 38311017 DOI: 10.1016/j.jdent.2024.104865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 01/13/2024] [Accepted: 01/25/2024] [Indexed: 02/06/2024] Open
Abstract
OBJECTIVES To evaluate the fracture strength and linear elongation at break of three-units fixed partial dentures (FPDs) fabricated with traditional and new materials for fixed prosthodontics before and after ageing. METHODS Sixty models of three-units FPDs were fabricated and cemented onto a Co-Cr model simulating the replacement of a maxillary second premolar. The samples were randomly divided into 3 groups: metal-ceramic (MCR), graphene-doped polymethylmethacrylate (PMMA-GR) and polymethylmethacrylate (PMMA). Half of the samples were directly subjected to fracture test, while the remaining half underwent an ageing process and then a fracture loading test using an electrodynamic testing machine. Fracture load and elongation at break values were taken and statistically analysed. RESULTS Significant differences were detected between the different materials (p<0.05). All groups showed a reduction of the fracture load and elongation at break values after ageing, but not statistically significant, except for PMMA group (p = 2.012e-19) (p = 3.8e-11). CONCLUSIONS MCR and PMMA-GR three-units FPDs showed higher fracture strength and lower elongation at break compared to PMMA. MCR and PMMA-GR had higher resistance to ageing processes compared to PMMA. CLINICAL SIGNIFICANCE PMMA-GR could be considered a material for long-term provisional restorations as its mechanical behaviour and ageing resistance are more like MCR than PMMA.
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Affiliation(s)
- Luca Ortensi
- Department of Prosthodontics, University of Ferrara, Ferrara, Italy
| | - Francesco Grande
- Department of Prosthodontics, University of Ferrara, Ferrara, Italy; Department of Mechanical and aerospace engineering, Polytechnic University of Turin, Turin, Italy.
| | - Claudia Testa
- Department of General Surgery and Medical- Surgical Specialties, University of Catania, Italy
| | - Alessandro Mosca Balma
- Department of Surgical Sciences, CIR Dental School, University of Turin, 10126 Turin, Italy
| | - Riccardo Pedraza
- Department of Mechanical and aerospace engineering, Polytechnic University of Turin, Turin, Italy; Department of Surgical Sciences, CIR Dental School, University of Turin, 10126 Turin, Italy
| | - Federico Mussano
- Department of Surgical Sciences, CIR Dental School, University of Turin, 10126 Turin, Italy
| | | | - Eugenio Pedullà
- Department of General Surgery and Medical- Surgical Specialties, University of Catania, Italy
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Gürbüz A, Güçlü ZB, Deste Gökay G, Durkan R. Biomechanical comparison of different prosthetic materials and posterior implant angles in all-on-4 treatment concept by three-dimensional finite element analysis. BIOMED ENG-BIOMED TE 2022; 67:307-315. [PMID: 35587648 DOI: 10.1515/bmt-2022-0109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Accepted: 04/21/2022] [Indexed: 11/15/2022]
Abstract
The study aimed to evaluate the biomechanical behaviors of different prosthetic materials and posterior implant angles in All-on-4 implant-supported fixed maxillary prostheses with three-dimensional (3D) finite element analysis. The model of complete edentulous maxilla was created using the Rhinoceros and VRMesh Studio programs. Anterior vertical and 17°- and 30°-angled posterior implants were positioned with All-on-4 design. Straigth and angled multi-unit abutments scanned using a 3D scanner. Two different prosthetic superstructures (monolithic zirconia framework and lithium disilicate veneer (ZL) and monolithic zirconia-reinforced lithium silicate (ZLS)) were modeled. Four models designed according to the prosthetic structure and posterior implant angles. Posterior vertical bilateral loading and frontal oblique loading was performed. The principal stresses (bone tissues-Pmax and Pmin) and von Mises equivalent stresses (implant and prosthetic structures) were analyzed. In all models, the highest Pmax stress values were calculated under posterior bilateral loading in cortical bone. The highest von Mises stress levels occured in the posterior implants under posterior bilateral load (260.33 and 219.50 MPa) in the ZL-17 and ZL-30 models, respectively. Under both loads, higher stress levels in prosthetic structures were shown in the ZLS models compared with ZL models. There was no difference between posterior implant angles on stress distribution occurred in implant material and alveolar bone tissue. ZLS and ZL prosthetic structures can be reliably used in maxillary All-on-4 rehabilitation.
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Affiliation(s)
- Ayhan Gürbüz
- Department of Prosthodontics, Faculty of Dentistry, Ankara University, Ankara, Turkey
| | - Zekiye Begüm Güçlü
- Department of Prosthodontics, Faculty of Dentistry, Ankara University, Ankara, Turkey
| | - Gonca Deste Gökay
- Department of Prosthodontics, Faculty of Dentistry, Bursa Uludağ University, Bursa, Turkey
| | - Rukiye Durkan
- Department of Prosthodontics, Faculty of Dentistry, Istanbul Okan University, Istanbul, Turkey
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KAYALI F, KAHRAMANOĞLU E. COMPARISON OF FRACTURE RESISTANCE BETWEEN TWO MONOLITHIC AND ONE VENEERED ZIRCONIA MATERIALS ON MOLAR CROWNS AFTER THERMOMECHANICAL FATIGUE. CLINICAL AND EXPERIMENTAL HEALTH SCIENCES 2020. [DOI: 10.33808/clinexphealthsci.783438] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Dartora NR, Maurício Moris IC, Poole SF, Bacchi A, Sousa-Neto MD, Silva-Sousa YT, Gomes EA. Mechanical behavior of endocrowns fabricated with different CAD-CAM ceramic systems. J Prosthet Dent 2020; 125:117-125. [PMID: 32057485 DOI: 10.1016/j.prosdent.2019.11.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Revised: 11/01/2019] [Accepted: 11/01/2019] [Indexed: 10/25/2022]
Abstract
STATEMENT OF PROBLEM The mechanical behavior of ceramic endocrowns is unclear. PURPOSE The purpose of this in vitro and 3-dimensional finite element analysis (3D-FEA) study was to evaluate the mechanical behavior of endodontically treated teeth restored with ceramic endocrowns made by using different computer-aided design and computer-aided manufacturing (CAD-CAM) systems. MATERIAL AND METHODS Sixty mandibular human molars were endodontically treated, prepared for endocrowns, and divided into 4 groups (n=15) according to the following various ceramic systems: leucite-based glass-ceramic (LC group), lithium disilicate-based glass-ceramic (LD group), glass-ceramic based on zirconia-reinforced lithium silicate (LSZ group), and monolithic zirconia (ZR group). After adhesive bonding, the specimens were subjected to thermomechanical loading and then to fracture resistance testing in a universal testing machine. The failure mode of the specimens was qualitatively evaluated. Three-dimensional FEA was performed to evaluate the stress distribution in each group. Data were analyzed by using a 1-way ANOVA and the Tukey HSD test (α=.05). RESULTS Statistically significant differences among the groups were observed (P<.05). The outcomes of the LC, LD, and LSZ groups were similar (1178 N, 1935 N, and 1859 N) but different from those of the ZR group (6333 N). The LC and LD groups had a higher ratio of restorable failures, while LSZ and ZR had more nonrestorable failures. Fractographic analysis indicated a regular failure pattern in the ZR group and irregular failure patterns in the other groups. Three-dimensional FEA revealed similar values and stress pattern distributions among the groups. CONCLUSIONS The mechanical performance of monolithic zirconia was better than that of the other ceramic endocrowns considered in this research; however, monolithic zirconia presented a higher rate of catastrophic tooth structure failure.
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Affiliation(s)
- Nereu Roque Dartora
- Postgraduate student, School of Dentistry, University of Ribeirão Preto (UNAERP), Ribeirão Preto, Brazil
| | | | - Stephanie Francoi Poole
- Postgraduate student, School of Dentistry, University of Ribeirão Preto (UNAERP), Ribeirão Preto, Brazil
| | - Ataís Bacchi
- Professsor, Meridional Faculty (IMED), School of Dentistry, Passo Fundo, Brazil
| | - Manoel Damião Sousa-Neto
- Professor, Department of Restorative Dentistry, Dental School of Ribeirão Preto, University of São Paulo (FORP-USP), Ribeirão Preto, Brazil
| | | | - Erica Alves Gomes
- Professor, School of Dentistry, University of Ribeirão Preto (UNAERP), Ribeirão Preto, Brazil.
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Marchionatti AME, Wandscher VF, Aurélio IL, Bergoli CD, May LG. File-splitting multilayer vs monolithic Y-TZP: Fatigue flexural strength and loading stresses by finite element analysis. Dent Mater 2019; 35:e63-e73. [DOI: 10.1016/j.dental.2019.01.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Revised: 12/20/2018] [Accepted: 01/11/2019] [Indexed: 11/29/2022]
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Antunes MCF, Miranda JS, Carvalho RLAD, Carvalho RFD, Kimpara ET, Assunção E Souza ROD, Leite FPP. Can low-fusing glass application affect the marginal misfit and bond strength of Y-TZP crowns? Braz Oral Res 2018; 32:e34. [PMID: 29742232 DOI: 10.1590/1807-3107bor-2018.vol32.0034] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 03/13/2018] [Indexed: 11/22/2022] Open
Abstract
To evaluate the effect of different surface treatments on the marginal misfit and retentive strength between Y-TZP crowns and an epoxy resin. Forty (40) epoxy resin (G10) abutments (height: 5mm, conicity: 60, finish line: large chamfer) with equal dimensions were milled and included in polyurethane to simulate the periodontal ligament. Next, 40 Y-TZP crowns (thickness: 1mm) were milled (Cerec in Lab) and randomly divided into four groups (n=10) according to the surface treatment: GS(glaze spray), GP(glaze powder/liquid), P(zirconia primer) and RS(tribochemical silica coating). The conditioned surfaces were cemented with dual self-adhesive cement, light cured and submitted to thermomechanical cycling (2x106, 100N, 4Hz, 5°/55°C). Marginal misfit was analyzed by a stereomicroscope and SEM. Retentive strength test was performed (1mm/min) until crown debonding. Glaze layer thickness was also performed to GS and GP groups. Marginal misfit data were analyzed by Kruskal Wallis and Dunn tests; one-way ANOVA and Tukey (5%) analyzed the tensile strength data. The marginal misfit of the GS (48.6±19.9μm) and GP (65.4±42.5μm) were statistically lower than the RS (96±62.9μm) and P (156±113.3μm) (p=0.001). The retentive strength of the GP (470.5±104.1N) and GS (416.8±170.2N) were similar to the P (342.1±109.7N), but statistically higher than those of the RS (208.9±110N). The GS and GP glaze layer was 11.64μm and 9.73μm respectively. Thus, glaze application promoted lower marginal discrepancy and higher retentive strength values than conventional techniques.
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Affiliation(s)
| | - Jean Soares Miranda
- São José dos Campos Dental School, Institute of Science and Technology, Universidade Estadual Paulista - Unesp, São José dos Campos, SP, Brazil
| | - Ronaldo Luís Almeida de Carvalho
- São José dos Campos Dental School, Institute of Science and Technology, Universidade Estadual Paulista - Unesp, São José dos Campos, SP, Brazil
| | | | - Estevão Tomomitsu Kimpara
- São José dos Campos Dental School, Institute of Science and Technology, Universidade Estadual Paulista - Unesp, São José dos Campos, SP, Brazil
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Sun T, Liu R, Liu X, Feng X, Zhang Y, Lai R. The Biocompatibility of Dental Graded Nano-Glass-Zirconia Material After Aging. NANOSCALE RESEARCH LETTERS 2018; 13:61. [PMID: 29473113 PMCID: PMC5823795 DOI: 10.1186/s11671-018-2479-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Accepted: 02/14/2018] [Indexed: 06/08/2023]
Abstract
ᅟ: A graded nano-glass/zirconia (G/Z) system has been developed via the infiltration of nano-glass into a nano-zirconia surface, which is advantageous for robust core-veneer bonds. The aging issue is a key for yttrium-stabilized tetragonal zirconia polycrystals (Y-TZPs), and therefore, it is necessary to evaluate the influence of aging degradation on the biocompatibility of G/Z systems before their possible clinical application. Herein, such biocompatibility testing was performed with human gingival fibroblasts (HGFs) seeded onto unaged/aged G/Z and Y-TZP for 2-72 h. Assessments included an oral mucous membrane irritation test in conjunction with analyses of cell viability, cell adhesion, and oxidative stress responses. Significant metabolic decreases in aged G/Z- and Y-TZP-treated cells were observed at 72 h. G/Z did not elicit any significant differences in cell viability compared with Y-TZP over 72 h both before and after aging. The oxidative stress data for the aged G/Z- and Y-TZP-treated cells showed a significant increase at 72 h. The G/Z specimens did not elicit any significant differences in ROS production compared with Y-TZP over 72 h both before and after aging. The cell adhesion rates of both G/Z and Y-TZP increased significantly after aging. The cell adhesion rates of G/Z and Y-TZP were not significantly different before and after aging. According to the oral mucous membrane irritation test, scores for macroscopic and microscopic observations for both the aged G/Z and unaged G/Z sides were 0, demonstrating no consequent irritation. CONCLUSIONS The excellent biocompatibility of G/Z indicates that it has potential for future clinical applications.
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Affiliation(s)
- Ting Sun
- Medical Center of Stomatology, The First Affiliated Hospital of Jinan University, Guangzhou, 510630, China
| | - Ruoyu Liu
- Shenzhen Traditional Chinese Medicine Hospital, Shenzhen, 518033, China
| | - Xiangning Liu
- Medical Center of Stomatology, The First Affiliated Hospital of Jinan University, Guangzhou, 510630, China
| | - Xiaoli Feng
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Yanli Zhang
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Renfa Lai
- Medical Center of Stomatology, The First Affiliated Hospital of Jinan University, Guangzhou, 510630, China.
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Spies BC, Pieralli S, Vach K, Kohal RJ. CAD/CAM-fabricated ceramic implant-supported single crowns made from lithium disilicate: Final results of a 5-year prospective cohort study. Clin Implant Dent Relat Res 2017; 19:876-883. [DOI: 10.1111/cid.12508] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 04/05/2017] [Accepted: 05/17/2017] [Indexed: 11/27/2022]
Affiliation(s)
- Benedikt Christopher Spies
- Department of Prosthetic Dentistry; Center for Dental Medicine, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg; Germany
| | - Stefano Pieralli
- Department of Prosthetic Dentistry; Center for Dental Medicine, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg; Germany
| | - Kirstin Vach
- Medical Center-University of Freiburg; Center for Medical Biometry and Medical Informatics, Institute for Medical Biometry and Statistics; Freiburg Germany
| | - Ralf-Joachim Kohal
- Department of Prosthetic Dentistry; Center for Dental Medicine, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg; Germany
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