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Bataineh K, Al Janaideh M, Abu-Naba'a LA. Fatigue Resistance of 3-Unit CAD-CAM Ceramic Fixed Partial Dentures: An FEA Study. J Prosthodont 2022; 31:806-814. [PMID: 35118758 DOI: 10.1111/jopr.13487] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Accepted: 01/25/2022] [Indexed: 01/04/2023] Open
Abstract
PURPOSE To estimate the fatigue life of 3-unit molar fixed partial dentures (FPDs) made from two different monolithic ceramic systems, zirconia cercon (ZC) and lithium disilicate (LD). The effect of the connector size on the fatigue resistance of the monolithic FPD was also investigated. METHODS Two models for the FPDs were built, a 3-unit all-ceramic and a porcelain-fused-to-metal. The porcelain-fused-to-metal FPD model was used as the control. Actual 3-unit FPDs (replacing the second lower premolar) were constructed using a computer aided design and computer-aided manufacturing (CAD-CAM) system. Finite element analysis (FEA) was executed. A hemispherical indenter was used to simulate occlusal load. The occlusal load phase of the chewing cycle was applied at the premolar pontic. RESULTS The failure location for the monolithic FPD was always located at the distal connector. Connector size played a key role in determining the long-term survival of the prosthesis. The fatigue resistance was predicted to be 670 N for the ZC with a connector size 4 × 3 mm, while it was only 226 N for LD. As for porcelain-fused-to-metal (PFM), FEA predicts that fatigue resistance can reach up to 770 N. Under the cyclic load of 670 N, the fatigue life for the zirconia FPD with connector size 4 × 3 mm was 2.23 × 106 cycles while it survived only 3.1 × 105 cycles when the connector was reduced to 3.5 × 2.5 mm. The angle of the oblique load has a significant effect on the stress distribution. CONCLUSION 3-unit monolithic FPDs made of ZC have superior fatigue performance compared to those made of LD. The fatigue life of the zirconia FPD was about three times longer than that made of LD with a connector size of 4 mm × 3 mm. The survival rates of ZC FPDs are comparable to porcelain-fused-to-metal. A significant reduction in fatigue strength is predicted for reduced connector size. Therefore, it is necessary to establish general guidelines for the minimum connector size.
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Affiliation(s)
- Khaled Bataineh
- Department of Mechanical Engineering, Jordan University of Science and Technology, Irbid, Jordan
| | - Mohammad Al Janaideh
- Department of Mechanical Engineering, Jordan University of Science and Technology, Irbid, Jordan
| | - Layla A Abu-Naba'a
- Department of Prosthodontics, Jordan University of Science and Technology, Irbid, Jordan
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Messias A, Neto MA, Amaro AM, Nicolau P, Roseiro LM. Effect of round curvature of anterior implant-supported zirconia frameworks: finite element analysis and in vitro study using digital image correlation. Comput Methods Biomech Biomed Engin 2017; 20:1236-1248. [DOI: 10.1080/10255842.2017.1348501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Ana Messias
- Department of Dentistry, Faculty of Medicine, University of Coimbra, Coimbra, Portugal
- CEMMPRE, Center for Mechanical Engineering, Materials and Process, Faculty of Sciences and Technology, University of Coimbra, Coimbra, Portugal
| | - Maria Augusta Neto
- CEMMPRE, Center for Mechanical Engineering, Materials and Process, Faculty of Sciences and Technology, University of Coimbra, Coimbra, Portugal
| | - Ana Martins Amaro
- CEMMPRE, Center for Mechanical Engineering, Materials and Process, Faculty of Sciences and Technology, University of Coimbra, Coimbra, Portugal
| | - Pedro Nicolau
- Department of Dentistry, Faculty of Medicine, University of Coimbra, Coimbra, Portugal
- CEMMPRE, Center for Mechanical Engineering, Materials and Process, Faculty of Sciences and Technology, University of Coimbra, Coimbra, Portugal
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Gorler O, Saygin AG. Comparative Evaluation of Effects of Laser Modalities on Shear Bond Strengths of Veneering Porcelains to Laser Sintered Substructures: An In Vitro Study. Photomed Laser Surg 2017; 35:338-344. [PMID: 28590838 DOI: 10.1089/pho.2017.4299] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
OBJECTIVE Laser modalities and direct metal laser sintering (DMLS) have a potential to enhance micromechanical bonding between dental super- and infrastructures. However, the effect of different manufacturing methods on the metal-ceramic bond strength needs further evaluation. We investigated the effect of surface treatment with Er:YAG, Nd:YAG, and Ho:YAG lasers on the shear bond strength (SBS) of high-fusion dental porcelains (Vita and G-Ceram) to infrastructures prepared with DMLS in vitro settings. MATERIALS AND METHODS Study specimens (n = 128) were randomly divided into study subsets (n = 8), considering treatment types applied on the surface of infrastructures, including sandblasting and selected laser modalities; infrastructure types as direct laser sintered (DLS) and Ni-Cr based; and superstructure porcelains as Vita and G-Ceram. The SBS test was performed to assess the effectiveness of surface modifications that were also examined with a stereo microscope. RESULTS Considering laser procedure types, the highest SBS values were obtained by Er:YAG laser, followed by, with a decreasing efficiency, Ho:YAG laser and sandblasting procedures, and Nd:YAG laser procedure (p < 0.05). Nd:YAG laser decreases the bonding of Vita and G-Ceram in all the infrastructures compared with sandblasting. Considering porcelains, the highest SBS values were obtained by Vita (p < 0.05). Considering infrastructures, the highest SBS values were obtained by DMLS procedure (p < 0.05). The laser procedures caused surface irregularities as revealed by the stereo microscopic examination. CONCLUSIONS In current experimental settings, Er:YAG laser applied to DLS infrastructure veneered with Vita porcelain increases bonding strength more distinctly, and Nd:YAG laser applied to Ni-Cr-based infrastructure veneered with G-Ceram porcelain alters bonding strength unfavorably.
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Affiliation(s)
- Oguzhan Gorler
- Department of Prosthodontics, Cumhuriyet University Faculty of Dentistry , Sivas, Turkey
| | - Aysegul Goze Saygin
- Department of Prosthodontics, Cumhuriyet University Faculty of Dentistry , Sivas, Turkey
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ISHIKAWA Y, KOMADA W, INAGAKI T, NEMOTO R, OMORI S, MIURA H. The effects of post and core material combination on the surface strain of the 4-unit zirconia fixed partial denture margins. Dent Mater J 2017; 36:798-808. [DOI: 10.4012/dmj.2016-343] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Yoko ISHIKAWA
- Fixed Prosthodontics, Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University
| | - Wataru KOMADA
- Fixed Prosthodontics, Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University
| | - Tasuku INAGAKI
- Fixed Prosthodontics, Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University
| | - Reina NEMOTO
- Fixed Prosthodontics, Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University
| | - Satoshi OMORI
- Fixed Prosthodontics, Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University
| | - Hiroyuki MIURA
- Fixed Prosthodontics, Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University
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Partiyan A, Osman E, Rayyan MM, Aboushelib M, Ibrahim A, Jimbo R. Fracture resistance of three-unit zirconia fixed partial denture with modified framework. Odontology 2016; 105:62-67. [PMID: 27083582 DOI: 10.1007/s10266-016-0242-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 01/31/2016] [Indexed: 11/29/2022]
Abstract
Obtaining ideal prosthetic framework design is at times hindered by anatomical limitations in the posterior region that might increase the risk for zirconia restoration fracture. Modification such as increasing the bulk thickness especially in the connector region could result in strengthening the zirconia framework. Three-unit zirconia fixed partial dentures replacing mandibular molars were fabricated using the following two techniques: CAD/CAM technology and manual copy milling. Modified framework with unveneered full thickness connectors were designed and fabricated with the aforementioned methods. Conventional frameworks (0.5 mm thick with rounded 3 mm connectors) served as control (N = 20). After cementation on epoxy dies, the frameworks were loaded to fracture in a universal testing machine. Fractured surfaces were prepared for examination using scanning electron microscopy. Statistical analysis revealed significant differences in fracture resistance between conventional and modified framework design for both fabrication techniques tested. SEM examination indicated that critical crack originated at the tensile surface of the connectors for conventional frameworks. The critical crack for modified frameworks occurred on the axial wall of the abutments. The modification of the zirconia framework design presented significant improvement of the fracture resistance compared to the conventional design.
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Affiliation(s)
- Arthur Partiyan
- Department of Oral Rehabilitation Sciences, Faculty of Dentistry, Beirut Arab University, Beirut, Lebanon
| | - Essam Osman
- Department of Oral Rehabilitation Sciences, Faculty of Dentistry, Beirut Arab University, Beirut, Lebanon
| | - Mohammad M Rayyan
- Department of Oral Rehabilitation Sciences, Faculty of Dentistry, Beirut Arab University, Beirut, Lebanon.,Department of Fixed Prosthodontics, Faculty of Dentistry, Misr University for Science and Technology, 6th of October City, Egypt
| | - Moustafa Aboushelib
- Dental Biomaterials Department, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
| | - Ahmed Ibrahim
- Public Health Service (Folktandvården), Gefle County, Sweden
| | - Ryo Jimbo
- Department of Oral and Maxillofacial Surgery and Oral Medicine, Malmö University, Malmö, Sweden.
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Vasco MAA, Souza JTAD, Las Casas EBD, de Castro e Silva ALR, Hecke M. A method for constructing teeth and maxillary bone parametric model from clinical CT scans. COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING-IMAGING AND VISUALIZATION 2014. [DOI: 10.1080/21681163.2014.889579] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Motta AB, Pereira LC, Duda FP, Anusavice KJ. Influence of Substructure Design and Occlusal Reduction on the Stress Distribution in Metal Ceramic Complete Crowns: 3D Finite Element Analysis. J Prosthodont 2014; 23:381-9. [DOI: 10.1111/jopr.12119] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/05/2013] [Indexed: 11/29/2022] Open
Affiliation(s)
- Andréa Barreira Motta
- Department of Mechanical Engineering; Federal University of Rio de Janeiro; Rio de Janeiro Brazil
| | - Luiz Carlos Pereira
- Department of Metallurgy and Materials Engineering; Federal University of Rio de Janeiro; Rio de Janeiro Brazil
| | - Fernando Pereira Duda
- Department of Mechanical Engineering; Federal University of Rio de Janeiro; Rio de Janeiro Brazil
| | - Kenneth J. Anusavice
- Department of Restorative Dental Sciences; University of Florida College of Dentistry; Gainesville FL
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Dhingra K. Oral rehabilitation considerations for partially edentulous periodontal patients. J Prosthodont 2012; 21:494-513. [PMID: 22681519 DOI: 10.1111/j.1532-849x.2012.00864.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Traditional tooth-supported and implant-supported fixed/removable restorations are currently used to replace teeth lost due to periodontal disease. This article reviews the existing literature for oral rehabilitation of partially edentulous periodontal patients with various designs of removable dental prosthesis (RDP), fixed dental prosthesis (FDP) and implant-supported single crown (SC), by addressing their (a) general features, (b) survival and complication rates, along with considerations for treatment planning in periodontal patients, and (c) preference by patients. To answer these issues, relevant articles were searched and critically analyzed, and their data were extracted. Data reviewed indicated that despite many advantages, implant-supported restorations have higher complication rates than tooth-supported restorations. Systematic reviews on conventional RDPs are lacking, but existing literature reviews provide limited evidence suggesting the use of RDPs with design modifications along with strict periodontal care in periodontal patients. Numerous systematic reviews on conventional FDPs and implant-supported restorations provide a moderate level of evidence favoring their survival in periodontal patients; however, for long-term success of these restorations, the patient's periodontal condition needs to be stabilized. In terms of patient preference, no restoration is superior, as they all are governed by their cost, advantages, and disadvantages. Thus, in the wake of existing weak evidence for prosthodontic rehabilitation of periodontal patients by these restorations (especially, conventional RDPs and for FDPs and SCs in implant-supported restorations), longitudinal studies with standardized treatment protocol and methodology are needed to evaluate and compare tooth-supported and implant-supported restorations in periodontal patients with regard to survival rates, cost, maintenance, and patient-centered outcomes.
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Affiliation(s)
- Kunaal Dhingra
- Department of Periodontics, NSVK. Sri Venkateshwara Dental College, Bangalore, Karnataka, India.
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Kermanshah H, Bitaraf T, Geramy A. Finite Element Analysis of IPS Empress II Ceramic Bridge Reinforced by Zirconia Bar. JOURNAL OF DENTISTRY (TEHRAN, IRAN) 2012; 9:196-203. [PMID: 23323181 PMCID: PMC3536454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Accepted: 10/03/2012] [Indexed: 11/24/2022]
Abstract
OBJECTIVE The aim of this study was to determine the effect of trenched zirconia bar on the von Mises stress distribution of IPS -Empress II core ceramics. MATERIALS AND METHODS The three-dimensional model including a three-unit bridge from the second premolar to the second molar was designed. The model was reinforced with zirconia bar (ZB), zirconia bar with vertical trench (VZB) and zirconia bar with horizontal trench (HZB) (cross sections of these bars were circular). The model without zirconia bar was designed as the control. The bridges were loaded by 200 N and 500 N on the occlusal surface at the middle of the pontic component and von Mises stresses were evaluated along a defined path. RESULTS IN THE CONNECTOR AREA, VON MISES STRESS IN MPA WERE APPROXIMATELY IDENTICAL IN THE SPECIMENS WITH ZB (AT MOLAR CONNECTOR (MC): 4.75 and at premolar connector (PC): 6.40) and without ZB (MC: 5.50, PC: 6.68), and considerable differences were not recognized. Whereas, Von-Mises stress (MPa) in the specimens with horizontal trenched Zirconia bar (HZB) (MC: 3.91, PC: 2.44) and Vertical trenched Zirconia bar (VZB) (MC: 2.53, PC: 2.56) was decreased considerably. CONCLUSION Embeded trenched zirconia bar could reinforce IPS-Empress II at the connector area which is a main failure region in all ceramic fixed partial dentures.
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Affiliation(s)
- H. Kermanshah
- Assistant Professor, Department of Dental Research Center and Operative Dentistry, Faculty of Dentistry, Tehran University of Medical Science, Iran
| | - T. Bitaraf
- Research Assistant, Dental Researcher Center, Faculty of Dentistry, Tehran University of Medical Science, Iran
| | - A. Geramy
- Professors, Department of Orthodontics and Dental Research Center, Faculty of Dentistry, Tehran University of Medical Science, Iran,Corresponding author: A. Gerami, Department of Orthodontics and Dental Research Center, Faculty of Dentistry, Tehran University of Medical Science, Iran,
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Campos RE, Soares CJ, Quagliatto PS, Soares PV, de Oliveira OB, Santos-Filho PCF, Salazar-Marocho SM. In Vitro Study of Fracture Load and Fracture Pattern of Ceramic Crowns: A Finite Element and Fractography Analysis. J Prosthodont 2011; 20:447-55. [DOI: 10.1111/j.1532-849x.2011.00744.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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