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Kobayashi T, Honda J, Kubochi K, Iwasaki T, Watanabe Y, Komine F. Influence of attaching mechanical retentive devices onto frameworks on fracture resistance of implant-supported zirconia crowns. Dent Mater J 2024; 43:359-366. [PMID: 38583996 DOI: 10.4012/dmj.2023-188] [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] [Indexed: 04/09/2024]
Abstract
This study investigated the fracture load of implant-supported zirconia crowns (IZCs), in which indirect composite resin or feldspathic porcelain was layered onto zirconia frameworks with mechanical retentive devices. Three different zirconia frameworks were assessed: attaching mechanical retentive devices on glaze and opaque porcelain materials (GL and OP groups, respectively), and no attaching mechanical retentive devices (ND group). The frameworks were layered using feldspathic porcelain (FP veneer) and indirect composite resin (IC veneer). Fracture load of the specimens was measured. In FP veneer, the GL group recorded the highest fracture load. In the IC veneer, the GL and OP groups had significantly higher fracture load than the ND group. The fracture resistance of IZCs can be enhanced by applying glaze material before attaching mechanical retentive devices for porcelain layering. The mechanical retentive devices effectively yielded mechanical interlocking between the zirconia frameworks and the IC veneer in GL and OP groups.
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Affiliation(s)
- Tatsuro Kobayashi
- Department of Fixed Prosthodontics, Nihon University School of Dentistry
| | - Junichi Honda
- Department of Fixed Prosthodontics, Nihon University School of Dentistry
| | - Kei Kubochi
- Department of Fixed Prosthodontics, Nihon University School of Dentistry
| | - Taro Iwasaki
- Department of Fixed Prosthodontics, Nihon University School of Dentistry
| | - Yusuke Watanabe
- Department of Fixed Prosthodontics, Nihon University School of Dentistry
| | - Futoshi Komine
- Department of Fixed Prosthodontics, Nihon University School of Dentistry
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Nakai M, Imai K, Hashimoto Y. Cell viability of fine powders in hybrid resins and ceramic materials for CAD/CAM. Dent Mater J 2022; 41:495-505. [PMID: 35264544 DOI: 10.4012/dmj.2021-261] [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: 11/23/2022]
Abstract
Resin blocks and ceramic blocks for CAD/CAM crowns were cut into powders and separated into three particle size groups. Oxidative stress and cell viability were measured in 3T3 and FRSK cells. The results of cytotoxicity tended to be slightly higher for resin than for ceramics. The values also increased as the particle size decreased in the powders. In addition, incorporation into cells was frequently observed under SEM, suggesting that the particle size of easily incorporated dust is different among cell types. Fluorescence-activated cell sorter (FACS) showed an increase in apoptosis and a decrease in cell viability in most of the sample groups compared to the control group. Hematoxylin and eosin staining of the cells showed deep staining of the nuclei in the sample groups. It was found that oxidative stress cell viability and apoptosis appeared differently depending on the size of the particles and the type of cells.
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Affiliation(s)
- Mariko Nakai
- Department of Biomaterials, Faculty of Dentistry, Osaka Dental University
| | - Koichi Imai
- Department of Tissue Engineering, Faculty of Dentistry, Osaka Dental University.,Graduate School of Health Sciences, Osaka Dental University
| | - Yoshiya Hashimoto
- Department of Biomaterials, Faculty of Dentistry, Osaka Dental University
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Matsushima K, Kubochi K, Komine F, Kimura F, Kobayashi T, Matsumura H. Bond strength between a veneering composite resin and zirconia frameworks with attached mechanical retentive devices. Dent Mater J 2021; 41:117-125. [PMID: 34483203 DOI: 10.4012/dmj.2021-141] [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: 11/23/2022]
Abstract
The effects of mechanical retentive devices and various surface treatments on the shear bond strength between a veneering composite resin and zirconia was investigated. Zirconia disks were classified into three surface-treatment groups: airborne-particle abrasion, overglazing, and overglazing with white alumina particles of three different grain sizes (50, 70, and 105 μm) attached onto zirconia disks (ZR-50, ZR-70, and ZR-105, respectively). They were further divided into four groups (n=44): unprimed, Clearfil Porcelain Bond Activator (CA), Clearfil Photo Bond (CB), and CA+CB. An indirect composite resin was bonded to zirconia specimens. Shear bond strengths were measured. For the ZR-70 and ZR-105 groups, the CB and CA+CB specimens exhibited higher bond strengths than the other two specimens after thermocycling. The ZR-70 and ZR-105 groups achieved micromechanical interlocking, and priming with a phosphate monomer (MDP) yielded stable bond strengths between the composite resin and zirconia with alumina particles attached as retentive devices.
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Affiliation(s)
- Keisuke Matsushima
- Department of Fixed Prosthodontics, Nihon University School of Dentistry
| | - Kei Kubochi
- Department of Fixed Prosthodontics, Nihon University School of Dentistry
| | - Futoshi Komine
- Department of Fixed Prosthodontics, Nihon University School of Dentistry
| | - Fumiaki Kimura
- Department of Fixed Prosthodontics, Nihon University School of Dentistry
| | - Tatsuro Kobayashi
- Department of Fixed Prosthodontics, Nihon University School of Dentistry
| | - Hideo Matsumura
- Department of Fixed Prosthodontics, Nihon University School of Dentistry
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Güth JF, Erdelt K, Keul C, Burian G, Schweiger J, Edelhoff D. In vivo wear of CAD-CAM composite versus lithium disilicate full coverage first-molar restorations: a pilot study over 2 years. Clin Oral Investig 2020; 24:4301-4311. [PMID: 32399736 PMCID: PMC7666668 DOI: 10.1007/s00784-020-03294-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Accepted: 04/17/2020] [Indexed: 12/02/2022]
Abstract
Objectives To present a digital approach to measure and compare material wear behavior of antagonistic first molar restorations made of an experimental CAD/CAM composite (COMP) and lithium disilicate ceramic (LS2) in patients with reconstructed vertical dimension of occlusion (VDO) after generalized hard tissue loss. Methods A total of 12 patients underwent complete full jaw rehabilitation with full occlusal coverage restorations made either of COMP or LS2. The first molar restorations (n = 48) were chosen for wear examination. At annual recall appointments, polyether impressions were taken, and resulting plaster casts were digitalized using a laboratory scanner. Mean observation period was 371 days for first and 769 days for second year. The resulting 96 datasets were analyzed by superimposition of 3-D datasets using an iterative best-fit method. Based on the superimposition data, the wear rates of the occlusal contact areas (OCAs) were calculated. Results For antagonistic restorations made of COMP, the average wear rate was 24.8 ± 13.3 μm/month, while for LS2, it was 9.5 ± 4.3 μm/month in first year, with significant differences (p < 0.0001) between the materials. In second year, monthly wear rates decreased significantly for both materials: COMP (16.2 ± 10.7 μm/month) and LS2 (5.5 ± 3.3 μm/month). Statistical comparison between wear time showed significant differences for both materials: COMP p < 0.037 and LS2 p < 0.001. A logarithmic fit (COMP R2 = 0.081; LS2 R2 = 0.038) of the data was calculated to estimate the wear progression. Significance In patients with reconstructed VDO, restorations made of LS2 show a more stable wear behavior than ones out of experimental CAD/CAM composite. In cases of complete rehabilitation, load bearing CAD/CAM-composite restorations should be critically considered for application due to their occlusal wear behavior. However, when choosing a restorative material, not only the functional occlusal stability should be taken into account but also the prospect of minimally invasive treatment with maximum preservation of natural tooth structures.
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Affiliation(s)
- Jan-Frederik Güth
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, Goethestrasse 70, 80336 Munich, Germany
| | - Kurt Erdelt
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, Goethestrasse 70, 80336 Munich, Germany
| | - Christine Keul
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, Goethestrasse 70, 80336 Munich, Germany
| | - Gintare Burian
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, Goethestrasse 70, 80336 Munich, Germany
| | - Josef Schweiger
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, Goethestrasse 70, 80336 Munich, Germany
| | - Daniel Edelhoff
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, Goethestrasse 70, 80336 Munich, Germany
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Garcia PP, Cappoani A, Schelbauer RS, Correr GM, Gonzaga CC. Retrospective clinical and radiographic evaluation of restored endodontically treated teeth. Restor Dent Endod 2020; 45:e49. [PMID: 33294414 PMCID: PMC7691265 DOI: 10.5395/rde.2020.45.e49] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 06/10/2020] [Accepted: 06/16/2020] [Indexed: 11/11/2022] Open
Abstract
Objectives The aim of this study was to perform a clinical and radiographic analysis of endodontically treated teeth (ETT) restored with cast metal posts (CMPs) or prefabricated glass fiber posts (GFPs) and crowns. Materials and Methods Fifty ETT were restored with 25 CMPs and 25 GFPs at a private dental clinic between 2001 and 2016. The restorations consisted of 12 all-ceramic crowns, 31 metal-ceramic crowns, and 7 composite resin crowns. Demographic data, type of teeth, type of post-and-core system, time of placement, crown restorations, the number of proximal contacts, the type of antagonist, and reports of any complications after post-and-core placement were recorded for each patient. Assessments were performed at baseline (radiographic) and follow-up (radiographic and clinical). Data were analyzed by the McNemar test, the Pearson χ2 test, and Kaplan-Meier survival curves (α = 0.05). The mean follow-up was 67.6 months. Results No significant difference was observed for any of the radiographic parameters when the baseline and final radiographs were compared. In the clinical evaluation, anatomical form (p = 0.009) and occlusion (p = 0.001) showed significant differences according to the type of crown restoration; specifically, metal-ceramic and all-ceramic crowns outperformed composite resin crowns. Conclusions CMPs and GFPs showed favorable results for restoring ETT after 6 years of follow-up. All-ceramic and metal-ceramic crowns showed higher survival rates and better clinical outcomes.
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Affiliation(s)
- Paula Pontes Garcia
- School of Health Sciences, Graduate Program in Dentistry, Universidade Positivo, Curitiba, PR, Brazil
| | - Aline Cappoani
- School of Health Sciences, Graduate Program in Dentistry, Universidade Positivo, Curitiba, PR, Brazil
| | - Ricardo Susin Schelbauer
- School of Health Sciences, Graduate Program in Dentistry, Universidade Positivo, Curitiba, PR, Brazil
| | - Gisele Maria Correr
- School of Health Sciences, Graduate Program in Dentistry, Universidade Positivo, Curitiba, PR, Brazil
| | - Carla Castiglia Gonzaga
- School of Health Sciences, Graduate Program in Dentistry, Universidade Positivo, Curitiba, PR, Brazil
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Scribante A, Vallittu PK, Özcan M, Lassila LVJ, Gandini P, Sfondrini MF. Travel beyond Clinical Uses of Fiber Reinforced Composites (FRCs) in Dentistry: A Review of Past Employments, Present Applications, and Future Perspectives. BIOMED RESEARCH INTERNATIONAL 2018; 2018:1498901. [PMID: 30426003 PMCID: PMC6217899 DOI: 10.1155/2018/1498901] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Accepted: 10/02/2018] [Indexed: 12/17/2022]
Abstract
The reinforcement of resins with short or long fibers has multiple applications in various engineering and biomedical fields. The use of fiber reinforced composites (FRCs) in dentistry has been described in the literature from more than 40 years. In vitro studies evaluated mechanical properties such as flexural strength, fatigue resistance, fracture strength, layer thickness, bacterial adhesion, bonding characteristics with long fibers, woven fibers, and FRC posts. Also, multiple clinical applications such as replacement of missing teeth by resin-bonded adhesive fixed dental prostheses of various kinds, reinforcement elements of dentures or pontics, and direct construction of posts and cores have been investigated. In orthodontics, FRCs have been used also for active and passive orthodontic applications, such as anchorage units, en-masse movement units, and postorthodontic tooth retention. FRCs have been extensively tested in the literature, but today the advances in new technologies involving the introduction of nanofillers or new fibers along with understanding the design principles of FRC devices open new fields of research for these materials both in vitro and in vivo. The present review describes past and present applications of FRCs and introduces some future perspectives on the use of these materials.
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Affiliation(s)
- Andrea Scribante
- Unit of Orthodontics and Paediatric Dentistry, Section of Dentistry, Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, Italy
| | - Pekka K. Vallittu
- Department of Biomaterial Science and Turku Clinical Biomaterials Centre (TCBC), Institute of Dentistry, University of Turku, Turku, Finland
- City of Turku, Welfare Division, Turku, Finland
| | - Mutlu Özcan
- University of Zurich, Center for Dental and Oral Medicine, Dental Materials Unit, Clinic for Fixed and Removable Prosthodontics and Dental Materials Science, Zurich, Switzerland
| | - Lippo V. J. Lassila
- Department of Biomaterial Science and Turku Clinical Biomaterials Centre (TCBC), Institute of Dentistry, University of Turku, Turku, Finland
| | - Paola Gandini
- Unit of Orthodontics and Paediatric Dentistry, Section of Dentistry, Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, Italy
| | - Maria Francesca Sfondrini
- Unit of Orthodontics and Paediatric Dentistry, Section of Dentistry, Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, Italy
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Wulfman C, Koenig V, Mainjot AK. Wear measurement of dental tissues and materials in clinical studies: A systematic review. Dent Mater 2018; 34:825-850. [PMID: 29627079 DOI: 10.1016/j.dental.2018.03.002] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 03/04/2018] [Accepted: 03/12/2018] [Indexed: 11/30/2022]
Abstract
OBJECTIVES This study aims to systematically review the different methods used for wear measurement of dental tissues and materials in clinical studies, their relevance and reliability in terms of accuracy and precision, and the performance of the different steps of the workflow taken independently. METHODS An exhaustive search of clinical studies related to wear of dental tissues and materials reporting a quantitative measurement method was conducted. MedLine, Embase, Scopus, Cochrane Library and Web of Science databases were used. Prospective studies, pilot studies and case series (>10 patients), as long as they contained a description of wear measurement methodology. Only studies published after 1995 were considered. RESULTS After duplicates' removal, 495 studies were identified, and 41 remained for quantitative analysis. Thirty-four described wear-measurement protocols, using digital profilometry and superimposition, whereas 7 used alternative protocols. A specific form was designed to analyze the risk of bias. The methods were described in terms of material analyzed; study design; device used for surface acquisition; matching software details and settings; type of analysis (vertical height-loss measurement vs volume loss measurement); type of area investigated (entire occlusal area or selective areas); and results. SINIFICANCE There is a need of standardization of clinical wear measurement. Current methods exhibit accuracy, which is not sufficient to monitor wear of restorative materials and tooth tissues. Their performance could be improved, notably limiting the use of replicas, using standardized calibration procedures and positive controls, optimizing the settings of scanners and matching softwares, and taking into account unusable data.
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Affiliation(s)
- C Wulfman
- Unité de Recherches en Biomatériaux Innovants et Interfaces (URB2i) - EA442, Faculté de Chirurgie Dentaire, Université Paris Descartes, Sorbonne Paris Cité and Service d'odontologie, Hôpital Albert Chenevier, Assistance Publique - Hôpitaux de Paris, France.
| | - V Koenig
- Dental Biomaterials Research Unit (d-BRU) and Department of Fixed Prosthodontics, Institute of Dentistry, University of Liège (ULiège) and University of Liège Hospital (CHU), Liège, Belgium
| | - A K Mainjot
- Dental Biomaterials Research Unit (d-BRU) and Department of Fixed Prosthodontics, Institute of Dentistry, University of Liège (ULiège) and University of Liège Hospital (CHU), Liège, Belgium
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Comparative in vitro wear resistance of CAD/CAM composite resin and ceramic materials. J Prosthet Dent 2016; 115:199-202. [DOI: 10.1016/j.prosdent.2015.07.011] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2014] [Revised: 07/26/2015] [Accepted: 07/28/2015] [Indexed: 11/20/2022]
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Donovan TE, Marzola R, Becker W, Cagna DR, Eichmiller F, McKee JR, Metz JE, Albouy JP. Annual review of selected scientific literature: report of the Committee on Scientific Investigation of the American Academy of Restorative Dentistry. J Prosthet Dent 2014; 112:1038-87. [PMID: 25443419 DOI: 10.1016/j.prosdent.2014.09.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Revised: 09/02/2014] [Accepted: 09/02/2014] [Indexed: 12/14/2022]
Affiliation(s)
- Terence E Donovan
- Chair, Committee on Scientific Investigation, American Academy of Restorative Dentistry (AARD); Professor and Section Head for Biomaterials, Department of Operative Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, NC.
| | | | - William Becker
- Clinical Professor, Advanced Education in Prosthodontics, Herman Ostrow School of Dentistry, University of Southern California; private practice, Tucson, Ariz
| | - David R Cagna
- Associate Dean, Professor and Director, Advanced Prosthodontics, University of Tennessee, Health Science Center, College of Dentistry, Memphis, Tenn
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