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Oberoi G, Kornfellner E, Aigner DA, Unger E, Schwentenwein M, Bomze D, Staudigl C, Pahr D, Moscato F. Design and optimization of a novel patient-specific subperiosteal implant additively manufactured in yttria-stabilized zirconia. Dent Mater 2024:S0109-5641(24)00213-6. [PMID: 39084954 DOI: 10.1016/j.dental.2024.07.008] [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: 04/04/2024] [Revised: 07/10/2024] [Accepted: 07/23/2024] [Indexed: 08/02/2024]
Abstract
OBJECTIVE To design a patient-specific subperiosteal implant for a severely atrophic maxillary ridge using yttria-stabilized additively manufactured zirconia (3YSZ) and evaluate its material properties by applying topology optimization (TO) to replace bulk material with a lattice structure. MATERIALS A contrast-based segmented skull model from anonymized computed tomography data of a patient was used for the initial anatomical design of the implant for the atrophic maxillary ridge. The implant underwent finite element analysis (FEA) and TO under different occlusal load-bearing conditions. The resulting implant designs, in bulk material and lattice, were evaluated via in-silico tensile tests and 3D printed. RESULTS The workflow produced two patient-specific subperiosteal designs: a) an anatomically precise bulk implant, b) a TO lattice implant. In-silico tensile tests revealed that the Young's modulus of yttria-stabilized zirconia is 205 GPa for the bulk material and 83.3 GPa for the lattice. Maximum principal stresses in the implant were 61.14 MPa in bulk material and 278.63 MPa in lattice, both tolerable, indicating the redesigned implant can withstand occlusal forces of 125-250 N per abutment. Furthermore, TO achieved a 13.10 % mass reduction and 208.71 % increased surface area, suggesting improved osteointegration potential. SIGNIFICANCE The study demonstrates the planning and optimization of ceramic implant topology. A further iteration of the implant was successfully implanted in a patient-named use case, employing the same fabrication process and parameters.
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Affiliation(s)
- Gunpreet Oberoi
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Waehringer Guertel 18-20, AKH 4L, Vienna 1090, Austria; Austrian Center for Medical Innovation and Technology (ACMIT), Viktor Kaplan-Straße 2/1, Wiener Neustadt 2700, Austria.
| | - Erik Kornfellner
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Waehringer Guertel 18-20, AKH 4L, Vienna 1090, Austria.
| | - Daniel Alexander Aigner
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Waehringer Guertel 18-20, AKH 4L, Vienna 1090, Austria; Institute for Lightweight Design and Structural Biomechanics, TU Wien, Getreidemarkt 9, Wien 1060, Austria.
| | - Ewald Unger
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Waehringer Guertel 18-20, AKH 4L, Vienna 1090, Austria.
| | | | - Daniel Bomze
- Lithoz GmbH, Oberlaaer Straße 228, Vienna 1100, Austria.
| | - Christoph Staudigl
- Department of Cranio-Maxillofacial Surgery, Kepler Universitätsklinikum, Med Campus III. Krankenhausstraße 9, Linz 4021, Austria.
| | - Dieter Pahr
- Austrian Center for Medical Innovation and Technology (ACMIT), Viktor Kaplan-Straße 2/1, Wiener Neustadt 2700, Austria; Division Biomechanics, Karl Landsteiner University of Health Sciences, Dr.-Karl-Dorrek-Straße 30, Krems an der Donau 3500, Austria.
| | - Francesco Moscato
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Waehringer Guertel 18-20, AKH 4L, Vienna 1090, Austria; Ludwig Boltzmann Institute for Cardiovascular Research, Waehringer Guertel 18-20, Vienna 1090, Austria; Austrian Cluster for Tissue Regeneration, Vienna, Austria.
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Werneck RD, Queiroz DA, Freitas MIM, Rio DLD, Turssi CP. Association of Non-carious Cervical Lesions with Oral Hygiene Aspects and Occlusal Force. J Contemp Dent Pract 2023; 24:71-79. [PMID: 37272137 DOI: 10.5005/jp-journals-10024-3457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
AIM The purpose of this case-control (CT) study was to investigate the association between the presence of non-carious cervical lesions (NCCLs) with occlusal force and other potential risk factors. MATERIALS AND METHODS Thirty-nine participants with NCCLs [cases (CS)] and 39 with no NCCLs [control (CT)] attending the dental clinic of the Faculdades Integradas São Pedro (FAESA), located in Brazil, were enrolled in this study. Information was collected through anamnesis, clinical examination, and a questionnaire addressing aspects related to tooth brushing, dentifrice, and mouthwash use. In clinical examination, patients were submitted to four measurements of occlusal force in the maxillary first premolars and maxillary first molars, using a strain gauge sensor of medium intensity, the Flexiforce (Tekscan, South Boston, Massachusetts, United States of America). The sensor was calibrated for the unit of measurement in Newtons (N). Data were analyzed using a student's t-test and multiple logistic regression, e with a significance level of 5%. RESULTS There was no statistically significant difference between the case and CT groups regarding the bite force in the four measured regions. Logistic regression identified sex as a factor significantly associated with NCCLs (p = 0.020). The odds ratio showed the female sex had more chance (OR = 6.082; CI = 1.332-27.765) of having NCCLs. CONCLUSION It is concluded that females presented a higher risk factor for NCCLs than men. In contrast, there was no association of occlusal force, as well as aspects related to brushing and deleterious habits. CLINICAL SIGNIFICANCE Females have a higher risk factor for non-carious lesions than men.
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Affiliation(s)
- Rafael Dario Werneck
- Department of Prosthodontics, College of Dentistry, FAESA - Centro Universitário, Vitória, Espírito Santo, Brazil, Orcid: https://orcid.org/0000-0002-4862-1354
| | - Daher Antonio Queiroz
- Department of Restorative Dentistry and Prosthodontics, The University of Texas Health Science Center at Houston (UT Health); School of Dentistry, Houston, Texas, United States of America, Orcid: https://orcid.org/0000-0002-1477-8599
| | - Mariana Itaborai Moreira Freitas
- Department of Prosthodontics and Periodontology, University of Campinas - Piracicaba Dental School, Piracicaba, Sao Paulo, Brazil, Phone: +55 19 2106-5211, e-mail: , Orcid: https://orcid.org/0000-0001-7729-8536
| | - Diana Leyva Del Rio
- Division of Restorative and Prosthetic Dentistry, The Ohio State University College of Dentistry, Columbus, Ohio, United States of America, Orcid: https://orcid.org/0000-0001-7584-4302
| | - Cecilia Pedroso Turssi
- Division of Cariology and Restorative Dentistry, Sao Leopoldo Mandic Institute and Dental Research Center, Campinas, Sao Paulo, Brazil, Orcid: https://orcid.org/0000-0002-0078-9895
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Lan TH, Fok ASL, Hung CC, Du JK, Liu CT, Chen JH. Stress analysis and risk of failure during clenching in ceramic assembly models: 3-dimensional finite element analysis. J Dent Sci 2023; 18:791-800. [PMID: 37021211 PMCID: PMC10068548 DOI: 10.1016/j.jds.2023.01.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Revised: 01/18/2023] [Indexed: 02/04/2023] Open
Abstract
Background/purpose Clenching is a dental parafunctional disorder that jeopardizes the life of teeth and/or dental prostheses. Computer-aided design and computer-aided manufacturing (CAD/CAM)-fabricated or 3-dimensional-printed dental prostheses are aesthetic, strong, and of good quality, but noticeable damage can still be observed after clenching. Stress analysis of synthetic ceramic assemblies with various parameters was conducted to provide data that may be used to improve the fabrication of CAD/CAM-fabricated dental prostheses. Materials and methods Abaqus software was used to run the simulations. A total of 96 axisymmetric finite element ceramic assembly models were simulated under 800 N vertical loading and different contact radii (0.25, 0.5, 0.75, 1.0 mm), materials (IPS e.max CAD and Vita Enamic), layer thicknesses and combinations. Results Four-layered ceramic assembly models produced promising results with the following parameters: contact radius of at least 0.5 mm, total thickness of at least 0.5 mm, and use of IPS e.max CAD as the first layer and Vita Enamic as the second layer without cement. Conclusion The ideal four-layered assembly model design uses 0.25-mm-thick IPS e.max CAD as its outer layer to simulate enamel binding and 0.25-mm-thick Vita Enamic as its inner layer to imitate the natural tooth. This design may be used as reference for prosthodontic treatment.
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Affiliation(s)
- Ting-Hsun Lan
- Division of Prosthodontics, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
- School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
- Corresponding author. School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, 100 Shin-Chuan 1st Road, Sanmin District, Kaohsiung 807378, Taiwan.
| | - Alex Siu Lun Fok
- Minnesota Dental Research Center for Biomaterials and Biomechanics, University of Minnesota, Minneapolis, MN, USA
- Corresponding author. Minnesota Dental Research Center for Biomaterials and Biomechanics, University of Minnesota, Minneapolis, 16-212 Moos Tower 515 Delaware St. SE Minneapolis, MN, 55455, USA.
| | - Chun-Cheng Hung
- Division of Prosthodontics, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
- School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Je-Kang Du
- Division of Prosthodontics, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
- School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chih-Te Liu
- Division of Prosthodontics, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Jeh-Hao Chen
- Division of Prosthodontics, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
- School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
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Güleç C, Sarıkaya I. The influence of aging on the fracture load of milled monolithic crowns. BMC Oral Health 2022; 22:516. [PMCID: PMC9675227 DOI: 10.1186/s12903-022-02529-z] [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: 02/15/2022] [Accepted: 10/24/2022] [Indexed: 11/21/2022] Open
Abstract
Background This in-vitro study was conducted to assess the effect of aging on the fracture load of molar crowns fabricated with monolithic CAD/CAM materials. Methods The crown restorations were produced from Cerasmart, Vita Enamic, and IPS e.max CAD blocks. Aging was applied to the 10 samples each of monolithic CAD/CAM materials (n = 10). Dual-axis chewing simulator (50 N, 1.1 Hz, lateral movement: 1 mm, mouth opening: 2 mm, 1,200,000 cycles) and thermocycling (± 5–55 °C, 6000 cycles) were applied as an aging procedure. 10 samples each of monolithic CAD/CAM materials without aging (n = 10) were considered the control group. 6 tested groups were obtained. Then, all samples were evaluated in a universal testing machine to determine the fracture loading values’. Results There was not a statistically significant difference between the fracture load values before and after aging for all samples of Cerasmart, Vita Enamic, and IPS e.max CAD (p > 0.005). In a comparison of the monolithic materials together, a statistically significant difference was found between the fracture load values of IPS e.max CAD and Vita Enamic crowns before aging (p = 0.02). Also, Vita Enamic crowns (1978,71 ± 364,05 N) were found different from the IPS e.max CAD (p = 0.005) and Cerasmart crowns (p = 0.041) after aging. Conclusions Dynamic aging with 1.200.000 cycles was found to have no effect to fracture loading on milled Cerasmart, Vita Enamic, and IPS e.max CAD monolithic crowns.
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Affiliation(s)
- Ceyda Güleç
- grid.411550.40000 0001 0689 906XDepartment of Prosthodontics, Faculty of Dentistry, Tokat Gaziosmanpasa University, Ali Şevki Erek Campus, 60100 Tokat, Turkey
| | - Işıl Sarıkaya
- grid.411550.40000 0001 0689 906XDepartment of Prosthodontics, Faculty of Dentistry, Tokat Gaziosmanpasa University, Ali Şevki Erek Campus, 60100 Tokat, Turkey
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UCHIKURA K, MURAKAMI N, YAMAZAKI T, LYU H, NAGATA K, ONA M, IWASAKI N, TAKAHASHI H, WAKABAYASHI N. Fracture resistance of CAD/CAM restorative materials in mismatched removable partial denture rests: An <i>in vitro</i> experimental and finite element analysis. Dent Mater J 2022; 41:466-472. [DOI: 10.4012/dmj.2021-224] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Keiichiro UCHIKURA
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Natsuko MURAKAMI
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Toshiki YAMAZAKI
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Huaxin LYU
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Kohji NAGATA
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Masahiro ONA
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Naohiko IWASAKI
- Oral Health Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Hidekazu TAKAHASHI
- Oral Health Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Noriyuki WAKABAYASHI
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
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