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Peixoto RF, Tonin BSH, Pinto-Fiamengui LMS, Freitas-Pontes KM, Regis RR, Mattos MDGCD. Analysis of implant-supported cantilever fixed partial denture: An in vitro comparative study on vertical misfit, stress distribution, and cantilever fracture strength. J Prosthodont 2024; 33:584-592. [PMID: 37470305 DOI: 10.1111/jopr.13739] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 06/23/2023] [Accepted: 07/14/2023] [Indexed: 07/21/2023] Open
Abstract
PURPOSE To evaluate the vertical misfit, stress distribution around dental implants, and cantilever fracture strength of 3-unit implant-supported cantilever fixed partial dentures (FPDs) using frameworks made from different materials and manufacturing techniques. MATERIALS AND METHODS Forty FPDs were fabricated and divided into 5 groups (n = 8) based on the framework material used: LAS Co-Cr (Conventional casting-laser welding); TIG Co-Cr (Conventional casting -TIG welding); OP Co-Cr (Conventional casting-one-piece); CAD Co-Cr (CAD-CAM); and CAD Zr (CAD-CAM ZrO2). The vertical misfit was evaluated before porcelain application (T1) and before (T2), and after thermomechanical cycling (T3) by stereomicroscopy. Cantilever fracture strength was tested with a 50 kN (5000 kgf) load cell at a crosshead speed of 0.5 mm/min. Qualitative and quantitative photoelastic analysis was performed to evaluate stress distribution at seven specific points in five FPDs (n = 1/group) subjected to occlusal loading. RESULTS Only the molar showed interaction among the three factors (G × S × T; F(20.932) = 1.630; p = 0.044). Thermomechanical cycling (T2 vs. T3) had a significant effect on intra-group vertical misfit in molar, especially in LAS Co-Cr (Δ = 5.87; p = 0.018) and OP Co-Cr (Δ = 5.39; p = 0.007), with no significant effect in premolar (p > 0.05). Ceramic application combined with thermomechanical cycling (T1 vs. T3) caused a significant intra-group increase in vertical misfit in all groups, both in the molar and premolar (p < 0.05). OP Co-Cr was associated with greater vertical misfit and stress concentration. Frameworks manufactured by the CAD-CAM system exhibited lower vertical misfit and better stress distribution. FPDs with metal frameworks (>410.83 ± 72.26 N) showed significantly higher fracture strength (p < 0.05) than zirconia (277.47 ± 39.10 N), and the first signs of ceramic veneering fracture were observed around 900 N. CONCLUSIONS FPDs with frameworks manufactured using a CAD-CAM system appear to be associated with lower vertical misfit and better stress distribution, although the section of the frameworks followed by welding may be a viable alternative. In addition, metal frameworks exhibit high fracture strength.
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Affiliation(s)
- Raniel Fernandes Peixoto
- Department of Restorative Dentistry, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceará (FFOE/UFC), Fortaleza, Ceará, Brazil
| | - Bruna Santos Honório Tonin
- Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry, University of São Paulo (FORP/USP), Ribeirão Preto, São Paulo, Brazil
| | - Lívia Maria Sales Pinto-Fiamengui
- Department of Restorative Dentistry, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceará (FFOE/UFC), Fortaleza, Ceará, Brazil
| | - Karina Mattes Freitas-Pontes
- Department of Restorative Dentistry, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceará (FFOE/UFC), Fortaleza, Ceará, Brazil
| | - Rômulo Rocha Regis
- Department of Restorative Dentistry, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceará (FFOE/UFC), Fortaleza, Ceará, Brazil
| | - Maria da Glória Chiarello de Mattos
- Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry, University of São Paulo (FORP/USP), Ribeirão Preto, São Paulo, Brazil
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Pereira ALC, de Luna Gomes JM, Campos MDFTP, de Medeiros AKB, Torres ACSP, Pellizzer EP, Carreiro ADFP. Device trueness in passivity and misfit of CAD-CAM frameworks: Conventional versus printed casts. J Prosthet Dent 2023:S0022-3913(23)00548-6. [PMID: 37748995 DOI: 10.1016/j.prosdent.2023.07.039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2022] [Revised: 07/18/2023] [Accepted: 07/18/2023] [Indexed: 09/27/2023]
Abstract
STATEMENT OF PROBLEM Obtaining a passive and well-adapted framework is challenging when intraoral scanning edentulous arches with multiple implants. The trueness of the printed casts is unclear. PURPOSE The purpose of this clinical study was to evaluate the trueness of frameworks made from conventional and printed casts regarding clinical passivity and misfit. MATERIAL AND METHODS Ten participants with complete mandibular fixed implant-supported interim prostheses retained by 4 implants were included. Each participant had a conventional impression and a digital scan made. The digital scan was made using an innovative device. Both conventional and digital casts were made, and the virtual images were used for milling the digital framework in cobalt chromium alloy. All frameworks were evaluated for passivity and marginal vertical misfit with the single screw test, with 4 attempts consisting of the tightened screw position, a test with all screws tightened, and an interspersed tightening test. The Kruskal-Wallis test was used to evaluate the trueness of the tested device for framework construction through the single screw test on vertical marginal misfit in the conventional and printed groups (α=.008). The Friedman test was used to assess the effect of test type (α=.05), and the Wilcoxon test was used to identify group-to-group differences (α=.017). RESULTS The absence of space between the framework and the abutments and interferences during its placement, as well as good stability, were observed clinically. In laboratory analysis, greater framework misfits were observed in the printed group compared with the conventional group when the single screw test was applied. Comparing the 3 tests used, the greatest misfits were observed when the framework was screwed onto the printed cast. CONCLUSIONS The innovative device tested for the intraoral scanning of multiple implants had clinically acceptable accuracy for the construction of passive and adapted frameworks. The conventional cast was more accurate than the printed cast, with lower misfit values, in all tests.
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Affiliation(s)
- Ana Larisse Carneiro Pereira
- Postgraduate student, Department of Dentistry, Federal University of Rio Grande do Norte (UFRN), Lagoa Nova, Natal, RN, Brazil
| | - Jéssica Marcela de Luna Gomes
- Postgraduate student, Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Vila Mendonça, Araçatuba, SP, Brazil
| | | | | | | | - Eduardo Piza Pellizzer
- Professor, Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Vila Mendonça, Araçatuba, SP, Brazil
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Marín-Miranda M, Wintergerst AM, Moreno-Vargas YA, Juárez-López MLA, Tavera-Ruiz C. Photoelasticity for Stress Concentration Analysis in Dentistry and Medicine. MATERIALS (BASEL, SWITZERLAND) 2022; 15:6819. [PMID: 36234159 PMCID: PMC9572149 DOI: 10.3390/ma15196819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 09/20/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
Complex stresses are created or applied as part of medical and dental treatments, which are linked to the achievement of treatment goals and favorable prognosis. Photoelasticity is an optical technique that can help observe and understand biomechanics, which is essential for planning, evaluation and treatment in health professions. The objective of this project was to review the existing information on the use of photoelasticity in medicine and dentistry and determine their purpose, the areas or treatments for which it was used, models used as well as to identify areas of opportunity for the application of the technique and the generation of new models. A literature review was carried out to identify publications in dentistry and medicine in which photoelasticity was used as an experimental method. The databases used were: Sciencedirect, PubMed, Scopus, Ovid, Springer, EBSCO, Wiley, Lilacs, Medigraphic Artemisa and SciELO. Duplicate and incomplete articles were eliminated, obtaining 84 articles published between 2000 and 2019 for analysis. In dentistry, ten subdisciplines were found in which photoelasticity was used; those related to implants for fixed prostheses were the most abundant. In medicine, orthopedic research predominates; and its application is not limited to hard tissues. No reports were found on the use of photoelastic models as a teaching aid in either medicine or dentistry. Photoelasticity has been widely used in the context of research where it has limitations due to the characteristics of the results provided by the technique, there is no evidence of use in the health area to exploit its application in learning biomechanics; on the other hand there is little development in models that faithfully represent the anatomy and characteristics of the different tissues of the human body, which opens the opportunity to take up the qualitative results offered by the technique to transpolate it to an application and clinical learning.
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Gundogdu M, Cansever S, Karaavcı MS, Ertas U. Implant-Prosthetic Rehabilitation of a Patient with Squamous Cell Carcinoma: A Case Report. J ORAL IMPLANTOL 2021; 48:215-219. [PMID: 33945615 DOI: 10.1563/aaid-joi-d-20-00324] [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: 11/22/2022]
Abstract
Patients who have undergone maxillary resection procedures are rehabilitated with dental obturators or microvascular reconstruction. This case report describes implant-supported prosthetic rehabilitation of a patient who underwent maxillary resection due to squamous cell carcinoma. After maxillectomy surgery, the patient was rehabilitated using a surgical obturator for one week followed by an interim obturator until the surgical field was completely healed. For definitive prosthesis, different treatment options were presented from which the patient selected an implant-supported maxillofacial prosthesis and a removable mandibular partial prosthesis. Under general anesthesia, two zygomatic implants and four conventional implants to the posterior maxilla were inserted. After a healing period, the bar-retained maxillofacial prosthesis and removable mandibular partial denture were fabricated. The patient was satisfied with regard to function, esthetics, speech, and swallowing. No problems, except slight discoloration of the prosthesis were noted at the 6-month follow-up. Implant-supported maxillofacial prostheses are a valuable treatment option to improve quality of life after maxillary resection.
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Affiliation(s)
- Mustafa Gundogdu
- Atatürk University Faculty of Dentistry Prosthodontics Atatürk University Faculty of Dentistry Department of Prosthodontics TURKEY Erzurum Yakutiye 25240 Atatürk University Faculty of Dentistry
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Pan Y, Tsoi JKH, Lam WYH, Pow EHN. Implant framework misfit: A systematic review on assessment methods and clinical complications. Clin Implant Dent Relat Res 2020; 23:244-258. [PMID: 33331058 DOI: 10.1111/cid.12968] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 11/25/2020] [Accepted: 11/26/2020] [Indexed: 11/28/2022]
Abstract
BACKGROUND The fit of implant-supported prostheses is of prime importance for the long-term success of implant therapy. PURPOSE This systematic review aimed to evaluate recent evidence on current techniques for assessing implant-framework misfit, its associated strain/stress, and whether these misfits are related to mechanical, biological, and clinical consequences. MATERIALS AND METHODS An electronic search for publications from January 2010 to October 2020 was performed using the Pubmed, Embase, Web of Science, and Cochrane Library databases with combined keywords on implant-framework misfit assessments and related clinical complications. Inclusion and exclusion criteria were applied. After full-text analyses, data extraction was implemented on current techniques of misfit assessment and the relationship between the misfit and the induced strain/stress. RESULTS A total of 3 in vivo and 92 in vitro studies were selected, including 47 studies on quantifying the degree of implant-framework misfit with dimensional techniques, 24 studies measuring misfit-induced strain/stress with modeling techniques, and 24 studies using both methods. The technical details, advantages, and limitations of each technique were illustrated. The correlation between the implant-framework misfit and the induced strain/stress has been revealed in vitro, while that with the biological complications and implant/prostheses failure was weak in clinical studies. CONCLUSIONS Dimensional and modeling techniques are available to measure the implant-framework misfit. The passivity of implant-supported fixed prostheses appeared related to the induced strain/stress, but not the clinical complications. Further studies combining three-dimensional (3D) assessments using dimensional and modeling techniques was needed.
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Affiliation(s)
- Yu Pan
- Faculty of Dentistry, The University of Hong Kong, Hong Kong special administrative region, China
| | - James K H Tsoi
- Faculty of Dentistry, The University of Hong Kong, Hong Kong special administrative region, China
| | - Walter Y H Lam
- Faculty of Dentistry, The University of Hong Kong, Hong Kong special administrative region, China
| | - Edmond H N Pow
- Faculty of Dentistry, The University of Hong Kong, Hong Kong special administrative region, China
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Barbin T, Velôso DV, Del Rio Silva L, Borges GA, Presotto AGC, Barão VAR, Mesquita MF. 3D metal printing in dentistry: An in vitro biomechanical comparative study of two additive manufacturing technologies for full-arch implant-supported prostheses. J Mech Behav Biomed Mater 2020; 108:103821. [PMID: 32469723 DOI: 10.1016/j.jmbbm.2020.103821] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 04/15/2020] [Accepted: 04/20/2020] [Indexed: 11/19/2022]
Abstract
The use of 3D technologies is progressing in the dental field. However, little is known about the biomechanical behavior of the additive manufacturing of full-arch fixed dental prostheses (FAFDPs) for the establishment of clinical protocols. We investigated the influence of three CAD/CAM technologies: milling (control), Selective Laser Melting (SLM) and Electron Beam Melting (EBM) for FAFDP manufacturing. Also, the effects of ceramic veneer and spark erosion on marginal misfits of FAFDPs, the stability of prosthetic screws, strain and stress on the implant-supported system, as well as the effect of chewing simulation on screw stability were evaluated. Fifteen Ti-6Al-4V alloy FAFDPs were obtained by means of CAD/CAM systems: milling, SLM and EBM (n = 5/group). The marginal misfit was analyzed according to the single-screw test protocol. Screw stability was analyzed by screw-loosening torque. Strain-gauge analysis investigated the strain on the mini-abutment analog, and photoelastic analysis investigated the stress on the peri-implant region. Subsequently, all frameworks underwent ceramic veneer and spark erosion procedures. Marginal misfit, screw-loosening and strain and stress analyses were assessed after each evaluation time: initial, ceramic veneer and spark erosion. Finally, all prostheses were subjected to 106 mechanical cycles (2 Hz/150 N), and screw-loosening was re-evaluated. Data were subjected to two-way ANOVA for repeated measures, and the Bonferroni test as a post hoc technique (α = 0.05). At the initial time, the milling group presented the lowest marginal misfit (p < 0.001). Ceramic veneer did not alter marginal misfit for all groups (p > 0.05); spark erosion decreased the misfit values for the SLM and EBM groups (p < 0.05). Evaluation time did not alter screw-loosening values for all groups (p = 0.191), although the milling group presented the highest screw-loosening values (p < 0.05). Ceramic veneer and spark erosion reduced strain in the components regardless of the manufacturing technology used (p < 0.05). The milling group presented the lowest stress values regardless of evaluation time (p = 0.001), and lower stress values were found after spark erosion regardless of the manufacturing group (p = 0.016). In conclusion, although milled frameworks exhibited the best biomechanical behavior, frameworks manufactured by additive technologies presented acceptable values of screw-loosening torque, strain and stress. Ceramic veneer did not negatively interfere in the biomechanical tests of the study, and clinically acceptable marginal misfit was achieved after spark erosion. Therefore, such 3D printing technologies seem to be feasible for the manufacturing of full-arch implant-supported frameworks.
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Affiliation(s)
- Thaís Barbin
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Limeira Avenue 901, Piracicaba, São Paulo, 13414-903, Piracicaba, Brazil.
| | - Daniele Valente Velôso
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Limeira Avenue 901, Piracicaba, São Paulo, 13414-903, Piracicaba, Brazil.
| | - Letícia Del Rio Silva
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Limeira Avenue 901, Piracicaba, São Paulo, 13414-903, Piracicaba, Brazil.
| | - Guilherme Almeida Borges
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Limeira Avenue 901, Piracicaba, São Paulo, 13414-903, Piracicaba, Brazil.
| | - Anna Gabriella Camacho Presotto
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Limeira Avenue 901, Piracicaba, São Paulo, 13414-903, Piracicaba, Brazil.
| | - Valentim Adelino Ricardo Barão
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Limeira Avenue 901, Piracicaba, São Paulo, 13414-903, Piracicaba, Brazil.
| | - Marcelo Ferraz Mesquita
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Limeira Avenue 901, Piracicaba, São Paulo, 13414-903, Piracicaba, Brazil.
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Fábrega J, Ríos-Santos JV, Falcão C, Herrero-Climent M. A modified protocol for restorative implant abutment selection by using computer-aided design and computer-aided manufacturing technology. J Prosthet Dent 2020; 125:341-348. [PMID: 32171490 DOI: 10.1016/j.prosdent.2019.12.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 12/11/2019] [Accepted: 12/11/2019] [Indexed: 10/24/2022]
Abstract
STATEMENT OF PROBLEM Implant abutment selection is complex because of the numerous factors involved. Computer-aided design (CAD) technology allows for the virtual selection and placement of abutments after all parameters have been precisely measured. The outcome of this new protocol should be validated. PURPOSE The purpose of this in vitro study was to validate a new digital protocol in which abutment selection is made through a CAD software program, the abutments are virtually placed, and the restoration is then designed based on the virtual abutments to fit the actual abutments when delivered to the implants intraorally. MATERIAL AND METHODS A cast with 2 parallel implants was scanned 10 times. Then, 2 abutments were placed and scanned 10 times. Twenty identical superstructures were designed and manufactured to simulate the clinical situation of a 3-unit fixed partial denture, screw-retained to 2 implants. These were divided into 2 groups-A, real abutment and B, virtual abutment-and then compared by means of digital and optical measurements. RESULTS No significant differences were detected for the measurements between the control and test groups in either the x-axis or y-axis; significant differences were found for the median value of the measurements obtained from both groups regarding the z-axis (P=.046). The mean gap in the virtual abutment group was 50 μm and 35 μm in the real abutment group. CONCLUSIONS Superstructures produced after the virtual selection and placement of intermediate restorative abutments compared favorably with those produced after the digitalization of actual abutments and placement in the implant model, thus validating the proposed digital protocol for virtual abutment selection and placement.
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Affiliation(s)
- Javier Fábrega
- Private practice, Madrid, Spain; Assistant Professor, Advanced Esthetic Program, Facultad de Odontología, Universidad Complutense, Madrid, Spain
| | - José Vicente Ríos-Santos
- Professor, Department of Periodontology, Facultad de Odontología, Universidad de Sevilla, Sevilla, Spain.
| | - Carlos Falcão
- Private practice, Porto Dental Institute, Oporto, Portugal; Assistant Professor, Faculty of Health Sciences, Fernando Pessoa University, Porto, Portugal
| | - Mariano Herrero-Climent
- Private practice, Porto Dental Institute, Oporto, Portugal; Assistant Professor, Facultad de Odontología, Universidad de Sevilla, Sevilla, Spain
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Yildirim B, Paken G. Evaluation of the Marginal and Internal Fit of Implant-Supported Metal Copings Fabricated with 3 Different Techniques: An In Vitro Study. J Prosthodont 2019; 28:315-320. [PMID: 30667169 DOI: 10.1111/jopr.13022] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/08/2019] [Indexed: 11/27/2022] Open
Abstract
PURPOSE To compare the marginal and internal fit of cobalt-chromium (Co-Cr) alloy copings fabricated by with lost wax technique (LW), computer-aided design and computer-aided manufacturing (CAD/CAM), and direct metal laser sintering (DMLS). MATERIALS AND METHODS Thirty-six tissue level, straight titanium abutments were screwed onto implant replicas. All specimens were embedded in acrylic resin and randomly divided into 3 subgroups according to the fabrication of metal coping: LW, CAD/CAM, and DMLS. In total, 36 (n = 12/group) Co-Cr implant-supported metal copings were prepared. Marginal, intermarginal, axial, and occlusal fits of each coping were measured using the silicone replica technique. The data were evaluated statistically using one-way ANOVA and Bonferioni post-hoc test (α = 0.05). RESULTS The CAD/CAM group showed significantly lower marginal fit than the LW group and DMLS groups (p < 0.001). The marginal fit of the LW group was not significantly different from the DMLS group (p = 0.721). No significant difference found among the fabrication methods in terms of intermarginal fit (p = 0.913). The CAD/CAM group showed lower axial fit than the LW group (p = 0.026), but there was no statistical difference between the DMLS group and the LW (p = 0.999) and CAD/CAM groups (p = 0.247). No significant differences found among the fabrication methods in terms of occlusal fit (p = 0.158). CONCLUSIONS The LW and DMLS groups showed better marginal fit compared to the CAD/CAM group; however, the CAD/CAM group was better than the LW group in terms of axial fit. All fabrication methods demonstrated similar intermarginal and occlusal fit.
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Affiliation(s)
- Bengisu Yildirim
- Department of Prosthodontics, Faculty of Dentistry, Usak University, Usak, Turkey
| | - Gamze Paken
- Department of Prosthodontics, Faculty of Dentistry, Usak University, Usak, Turkey
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Zaparolli D, Peixoto RF, Pupim D, Macedo AP, Toniollo MB, Mattos MDGCD. Photoelastic analysis of mandibular full-arch implant-supported fixed dentures made with different bar materials and manufacturing techniques. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 81:144-147. [PMID: 28887958 DOI: 10.1016/j.msec.2017.07.052] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Revised: 05/08/2017] [Accepted: 07/29/2017] [Indexed: 11/29/2022]
Abstract
PURPOSE To compare the stress distribution of mandibular full dentures supported with implants according to the bar materials and manufacturing techniques using a qualitative photoelastic analysis. MATERIAL AND METHODS An acrylic master model simulating the mandibular arch was fabricated with four Morse taper implant analogs of 4.5×6mm. Four different bars were manufactured according to different material and techniques: fiber-reinforced resin (G1, Trinia, CAD/CAM), commercially pure titanium (G2, cpTi, CAD/CAM), cobalt‑chromium (G3, Co-Cr, CAD/CAM) and cobalt‑chromium (G4, Co-Cr, conventional cast). Standard clinical and laboratory procedures were used by an experienced dental technician to fabricate 4 mandibular implant-supported dentures. The photoelastic model was created based on the acrylic master model. A load simulation (150N) was performed in total occlusion against the antagonist. RESULTS Dentures with fiber-reinforced resin bar (G1) exhibited better stress distribution. Dentures with machined Co-Cr bar (G3) exhibited the worst standard of stress distribution, with an overload on the distal part of the posteriors implants, followed by dentures with cast Co-Cr bar (G4) and machined cpTi bar (G2). CONCLUSION The fiber-reinforced resin bar exhibited an adequate stress distribution and can serve as a viable alternative for oral rehabilitation with mandibular full dentures supported with implants. Moreover, the use of the G1 group offered advantages including reduced weight and less possible overload to the implants components, leading to the preservation of the support structure.
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Affiliation(s)
- Danilo Zaparolli
- Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo - Ribeirão Preto, São Paulo, Brazil
| | - Raniel Fernandes Peixoto
- Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo - Ribeirão Preto, São Paulo, Brazil
| | - Denise Pupim
- Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo - Ribeirão Preto, São Paulo, Brazil
| | - Ana Paula Macedo
- Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo - Ribeirão Preto, São Paulo, Brazil
| | | | - Maria da Glória Chiarello de Mattos
- Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo - Ribeirão Preto, São Paulo, Brazil.
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Pasali B, Sarac D, Kaleli N, Sarac YS. Evaluation of marginal fit of single implant-supported metal-ceramic crowns prepared by using presintered metal blocks. J Prosthet Dent 2017; 119:257-262. [PMID: 28545869 DOI: 10.1016/j.prosdent.2017.03.015] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 03/24/2017] [Accepted: 03/27/2017] [Indexed: 11/28/2022]
Abstract
STATEMENT OF PROBLEM Recently, presintered metal blocks for nonprecious and precious metal implant-supported restorations have gained popularity in computer-aided design and computer-aided manufacturing (CAD-CAM) systems. However, few studies have evaluated the marginal discrepancy of implant-supported restorations made with these new alloy systems. PURPOSE The purpose of this in vitro study was to compare the milling-sintering method with the lost-wax and milling methods in terms of the marginal fit of implant-supported metal-ceramic restorations. MATERIAL AND METHODS Thirty implant abutments screwed to implant analogs were embedded into acrylic resin to investigate marginal fit and then divided according to fabrication methods into the following 3 groups (n=10): lost-wax (LW; control group), milling (M), and milling-sintering (MS). Porcelain material was applied to all specimens after completion of the fabrication process. Subsequently, all specimens were cemented to implant abutments for the measurement of marginal discrepancies. Twelve marginal discrepancy measurements were recorded on each implant abutment by using a stereomicroscope. The arithmetic mean of these 12 measurements was considered the mean marginal discrepancy value of each abutment. Data were statistically analyzed by using 1-way ANOVA and Tukey honest significant difference tests (α=.05). RESULTS The lowest mean marginal discrepancy values (81 ±2 μm) were observed in the M group, which was significantly different (P<.001) from the other methods. The highest mean marginal discrepancy values (99 ±2 μm) were observed in the MS group. CONCLUSIONS The results revealed that restorations prepared by the milling-sintering method provided clinically acceptable results (<120 μm); however, this new technique was not found to be as precise as the milling method in terms of marginal fit.
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Affiliation(s)
- Baris Pasali
- Dentist, Oral and Dental Health Center of Güngören, Istanbul, Turkey
| | - Duygu Sarac
- Chief, Professor, Department of Prosthodontics, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey
| | - Necati Kaleli
- Researcher, Department of Prosthodontics, Faculty of Dentistry, Ondokuz Mayis University, Samsun, Turkey.
| | - Yakup Sinasi Sarac
- Professor, Department of Prosthodontics, Faculty of Dentistry, Ondokuz Mayis University, Samsun, Turkey
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Presotto AGC, Bhering CLB, Mesquita MF, Barão VAR. Marginal fit and photoelastic stress analysis of CAD-CAM and overcast 3-unit implant-supported frameworks. J Prosthet Dent 2017; 117:373-379. [DOI: 10.1016/j.prosdent.2016.06.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Revised: 06/14/2016] [Accepted: 06/15/2016] [Indexed: 10/21/2022]
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de Araújo GM, de França DGB, Silva Neto JP, Barbosa GAS. Passivity of conventional and CAD/CAM fabricated implant frameworks. Braz Dent J 2017. [PMID: 26200153 DOI: 10.1590/0103-6440201300145] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The objective of this research was to evaluate the passivity by measuring the passive fit and strain development of frameworks screwed on abutments, made by CAD/CAM technology, and to compare these parts with samples manufactured by conventional casting. Using CAD/CAM technology, four samples were made from zirconia (Zircad) and four samples were manufactured from cobalt-chrome (CoCrcad). The control groups were four specimens of cobalt-chrome, made by one-piece casting (CoCrci), with a total of 12 frameworks. To evaluate the passive fit, the vertical misfit at the abutment-framework interface was measured with scanning electron microscopy (250×) when only one screw was tightened. The mean strain in these frameworks was analyzed by photoelasticity test. A significant difference in the passive fit was observed between the control and sample groups. CoCrcad exhibited the best value of passive fit (48.76±13.45 µm) and CoCrci the worst (187.55±103.63 µm); Zircad presented an intermediate value (103.81±43.15 µm). When compared to the other groups, CoCrci showed the highest average stress around the implants (17.19±7.22 kPa). It was concluded that CAD/CAM-fabricated frameworks exhibited better passivity compared with conventionally fabricated frameworks. CAD/CAM-fabricated Co-Cr frameworks may exhibit better passive fit compared with CAD/CAM-fabricated zirconia frameworks. Even so, similar levels of stress were achieved for CAD/CAM-fabricated frameworks.
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Affiliation(s)
| | | | - João Paulo Silva Neto
- Department of Dentistry, Universidade Federal do Rio Grande do Norte, Natal, RN, Brasil
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13
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Montanini R, Scafidi M, Staiti G, Marcianò A, D’Acquisto L, Oteri G. Misfit evaluation of dental implant-supported metal frameworks manufactured with different techniques: Photoelastic and strain gauge measurements. Proc Inst Mech Eng H 2016. [DOI: 10.1177/0954411916676192] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
This study aims to compare in-vitro the fitting accuracy of implant-supported metal frameworks used for full-arch orthodontic restoration. The hypotheses tested were as follows: (1) for a fixed implant morphology, strains developed within the framework depend on how the framework had been fabricated and (2) stresses transferred to the implant–bone interface are related to the amount of framework misfit. Metal frameworks were fabricated using four different manufacturing techniques: conventional lost-wax casting, resin cement luting, electrospark erosion, and computer-aided design/computer-aided manufacturing milling. Each framework was instrumented with three strain gauges to measure strains developed because of prosthetic misfit, while quantitative photoelastic analysis was used to assess the effect of misfit at the implant–resin interface. All the tested frameworks presented stress polarization around the fixtures. After screw tightening, significantly greater strains were observed in the lost-wax superstructure, while the lowest strains were observed in the luted framework, demonstrating consistent adaptation and passive fitting. No significant difference in stress distribution and marginal fit was found for bars fabricated by either computer-aided design/computer-aided manufacturing or spark erosion. This study suggested that, in spite of known limitations of in-vitro testing, direct luting of mesostructures and abutments should be the first clinical option for the treatment of complete edentulism, ensuring consistent passive fitting and effective cost–benefit ratio.
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Affiliation(s)
| | - Michele Scafidi
- Department of Chemical, Management, Computer and Mechanical Engineering, University of Palermo, Palermo, Italy
| | - Giorgio Staiti
- A.O.U. San Luigi Gonzaga, University of Turin, Turin, Italy
| | - Antonia Marcianò
- Department of Biomedical and Dental Sciences and Morphofunctional Imaging, University of Messina, Messina, Italy
| | - Leonardo D’Acquisto
- Department of Chemical, Management, Computer and Mechanical Engineering, University of Palermo, Palermo, Italy
| | - Giacomo Oteri
- Department of Biomedical and Dental Sciences and Morphofunctional Imaging, University of Messina, Messina, Italy
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Bhering CLB, Marques IDSV, Takahashi JMFK, Barão VAR, Consani RLX, Mesquita MF. The effect of casting and masticatory simulation on strain and misfit of implant-supported metal frameworks. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 62:746-51. [DOI: 10.1016/j.msec.2016.02.035] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 08/06/2015] [Accepted: 02/11/2016] [Indexed: 11/16/2022]
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Abstract
This study aims to compare stress transmitted to implants and passive fit of one-piece cast frameworks fabricated with 3 different materials: commercially pure titanium (G1-CP Ti), cobalt-chromium alloy (G2-Co-Cr), and nickel-chromium-titanium alloy (G3-Ni-Cr-Ti). In total, 12 frameworks simulating bars for fixed prosthesis in a model with 5 implants were fabricated. The passive fit of the framework interface was measured using an optical microscope and the stresses transmitted to implants were measured using quantitative photoelastic analysis. Data were statistically analyzed by analysis of variance (ANOVA) and least significant difference (LSD) tests (α = 0.05). Mean and standard deviation values of passive fit and stress over implants are presented, respectively: G1 [472.49 (109.88) μm and 11.38 (9.23) KPa], G2 [584.84 (120.20) μm and 15.83 (9.30) KPa], and G3 [462.70 (179.18) μm and 16.39 (9.51) KPa]. For stress over implants, there were significant differences between G1, G2, and G3 (P = 0.035), being the lowest values for the G1. There were no significant differences for passive fit between G1 and G3 (P = 0.844), but both were statistically different from G2 (P = 0.028 and P = 0.035, respectively), which showed the worse results. It may be concluded that the stress over implants was affected by the tested materials. The CP Ti presented the best values for the evaluated items.
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Lencioni KA, Macedo AP, Silveira Rodrigues RC, Ribeiro RF, Almeida RP. Photoelastic comparison of as-cast and laser-welded implant frameworks. J Prosthet Dent 2015; 114:652-9. [DOI: 10.1016/j.prosdent.2015.06.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 06/01/2015] [Accepted: 06/04/2015] [Indexed: 11/28/2022]
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17
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Analysis of the biomechanical behavior of short implants: The photo-elasticity method. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 55:187-92. [DOI: 10.1016/j.msec.2015.05.024] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 04/02/2015] [Accepted: 05/07/2015] [Indexed: 11/22/2022]
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18
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Papaspyridakos P, Hirayama H, Chen CJ, Ho CH, Chronopoulos V, Weber HP. Full-arch implant fixed prostheses: a comparative study on the effect of connection type and impression technique on accuracy of fit. Clin Oral Implants Res 2015; 27:1099-105. [PMID: 26374268 DOI: 10.1111/clr.12695] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/16/2015] [Indexed: 11/28/2022]
Abstract
PURPOSE The aim of this study was to assess the effect of connection type and impression technique on the accuracy of fit of implant-supported fixed complete-arch dental prostheses (IFCDPs). MATERIALS AND METHODS An edentulous mandibular cast with five implants was fabricated to serve as master cast (control) for both implant- and abutment-level baselines. A titanium one-piece framework for an IFCDP was milled at abutment level and used for accuracy of fit measurements. Polyether impressions were made using a splinted and non-splinted technique at the implant and abutment level leading to four test groups, n = 10 each. Hence, four groups of test casts were generated. The impression accuracy was evaluated indirectly by assessing the fit of the IFCDP framework on the generated casts of the test groups, clinically and radiographically. Additionally, the control and all test casts were digitized with a high-resolution reference scanner (IScan D103i, Imetric, Courgenay, Switzerland) and standard tessellation language datasets were generated and superimposed. Potential correlations between the clinical accuracy of fit data and the data from the digital scanning were investigated. To compare the accuracy of casts of the test groups versus the control at the implant and abutment level, Fisher's exact test was used. RESULTS Of the 10 casts of test group I (implant-level splint), all 10 presented with accurate clinical fit when the framework was seated on its respective cast, while only five of 10 casts of test group II (implant-level non-splint) showed adequate fit. All casts of group III (abutment-level splint) presented with accurate fit, whereas nine of 10 of the casts of test group IV (abutment-level non-splint) were accurate. Significant 3D deviations (P < 0.05) were found between group II and the control. No statistically significant differences were found between groups I, III, and IV compared with the control. Implant connection type (implant level vs. abutment level) and impression technique did affect the 3D accuracy of implant impressions only with the non-splint technique (P < 0.05). CONCLUSION For one-piece IFCDPs, the implant-level splinted impression technique showed to be more accurate than the non-splinted approach, whereas at the abutment-level, no difference in the accuracy was found.
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Affiliation(s)
- Panos Papaspyridakos
- Division of Postgraduate Prosthodontics, Tufts University School of Dental Medicine, Boston, MA, USA.,Department of Prosthodontics, School of Dentistry, National and Kapodistrian University of Athens, Athens, Greece
| | - Hiroshi Hirayama
- Division of Postgraduate Prosthodontics, Tufts University School of Dental Medicine, Boston, MA, USA
| | - Chun-Jung Chen
- Department of Dentistry, Chi Mei Medical Center, Tainan, Taiwan
| | - Chung-Han Ho
- Department of Medical Research, Chi Mei Medical Center, Tainan, Taiwan
| | - Vasilios Chronopoulos
- Department of Prosthodontics, School of Dentistry, National and Kapodistrian University of Athens, Athens, Greece.,Department of Restorative Dentistry, School of Dentistry and Oral Health, Griffith University, Gold Coast, Qld, Australia
| | - Hans-Peter Weber
- Division of Postgraduate Prosthodontics, Tufts University School of Dental Medicine, Boston, MA, USA
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Hasan I, Bourauel C, Keilig L, Stark H, Lückerath W. The effect of implant splinting on the load distribution in bone bed around implant-supported fixed prosthesis with different framework materials: A finite element study. Ann Anat 2015; 199:43-51. [PMID: 25640904 DOI: 10.1016/j.aanat.2014.12.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Revised: 11/10/2014] [Accepted: 12/23/2014] [Indexed: 11/28/2022]
Abstract
Analysing the influence of implant splinting and its relation to different framework materials is a complex issue. The stiffness of framework materials and the overload of the implant system directly affect the final transferred load of the bone around implants. A finite element model of a long-span cementable implant-supported fixed prosthesis was created. Three materials were analysed for the framework: Titanium, gold alloy, and zirconia. The connection screws were first preloaded with 200 N. Two loading conditions were studied: The implant at the molar region was first loaded without splinting to the framework, and in the second condition, the implant was splinted to the framework. A total force of 500 N and 1000 N in 30° from the long axis of the framework were applied in buccal or distal direction on the implant system. The stresses and strains within the framework materials, implant system, and bone bed around the supporting implants were analysed. Loading the implant distally was associated with high stresses within the implant system in comparison to buccal loading. By splinting the implant, the stress in the implant system was reduced from 5393 MPa to 2942 MPa. Buccal loading of the implant was more critical than the distal loading. In the splinted condition of the implant, the stresses in the cortical bone were reduced from 570 MPa to 275 MPa.
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Affiliation(s)
- I Hasan
- Endowed Chair of Oral Technology, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany; Department of Prosthetic Dentistry, Preclinical Education and Materials Science, Dental School, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany.
| | - C Bourauel
- Endowed Chair of Oral Technology, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany
| | - L Keilig
- Endowed Chair of Oral Technology, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany; Department of Prosthetic Dentistry, Preclinical Education and Materials Science, Dental School, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany
| | - H Stark
- Department of Prosthetic Dentistry, Preclinical Education and Materials Science, Dental School, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany
| | - W Lückerath
- Department of Prosthetic Dentistry, Preclinical Education and Materials Science, Dental School, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany
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20
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Correlation Between Vertical Misfits and Stresses Over Implants From Castable Frameworks Made of Different Alloys. J Craniofac Surg 2014; 25:2062-5. [DOI: 10.1097/scs.0000000000001194] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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de França DGB, Morais MHST, das Neves FD, Barbosa GAS. Influence of CAD/CAM on the fit accuracy of implant-supported zirconia and cobalt-chromium fixed dental prostheses. J Prosthet Dent 2014; 113:22-8. [PMID: 25277028 DOI: 10.1016/j.prosdent.2014.07.010] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Revised: 07/08/2014] [Accepted: 07/09/2014] [Indexed: 11/30/2022]
Abstract
STATEMENT OF PROBLEM Relatively little information is available on the accuracy of the abutment-implant interface in computer-aided design and computer-aided manufacturing (CAD/CAM)-fabricated zirconia and cobalt-chromium frameworks. PURPOSE The purpose of this study was to compare the fit accuracy of CAD/CAM-fabricated zirconia and cobalt-chromium frameworks and conventionally fabricated cobalt-chromium frameworks. MATERIAL AND METHODS Four groups of 3-unit, implant-supported, screw-retained frameworks were fabricated to fit an in vitro model with 3 implants. Eight frameworks were fabricated with the CAD/CAM system: 4 in zirconia and 4 in cobalt-chromium. Another 8 were cast in cobalt-chromium with conventional casting, including 4 with premachined abutments and 4 with castable abutments. The vertical misfit at the implant-framework interface was measured with scanning electron microscopy when only 1 screw was tightened and when all screws were tightened. Data were analyzed with the Kruskal-Wallis and Mann-Whitney tests (α=.05). RESULTS The mean vertical misfit values when all screws were tightened was 5.9 ±3.6 μm for CAD/CAM-fabricated zirconia, 1.2 ±2.2 μm for CAD/CAM-fabricated cobalt-chromium frameworks, 11.8 ±9.8 μm for conventionally fabricated cobalt-chromium frameworks with premachined abutments, and 12.9 ±11.0 μm for the conventionally fabricated frameworks with castable abutments; the Mann-Whitney test found significant differences (P<.05) among all frameworks, except between the conventionally fabricated frameworks (P=.619). No significant differences were found among the groups for passive fit gap measurements (P>.05). CONCLUSIONS When all of the screws were tightened, the CAD/CAM frameworks exhibited better fit accuracy compared with the conventionally fabricated frameworks. High levels of passive fit were achieved for the evaluated techniques.
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Affiliation(s)
- Danilo Gonzaga B de França
- Assistant Professor, Department of Dentistry, School of Dentistry, State University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil.
| | - Maria Helena S T Morais
- Graduate student, Department of Dentistry, School of Dentistry, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
| | - Flávio D das Neves
- Associate Professor, Department of Fixed Prosthodontics, Occlusion and Dental Materials, School of Dentistry, Federal University of Uberlândia, Uberlândia, Minas Gerais, Brazil
| | - Gustavo A S Barbosa
- Associate Professor, Department of Dentistry, School of Dentistry, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
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22
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Hasan I, Keilig L, Bourauel C, Lückerath W. The effect of screw preload and framework material on the success of cementable fixed partial prostheses: A finite element study. Ann Anat 2014; 199:58-66. [PMID: 24877686 DOI: 10.1016/j.aanat.2014.03.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 03/07/2014] [Accepted: 03/31/2014] [Indexed: 11/17/2022]
Abstract
The rigidity of framework materials and overload of the implant system directly affect the final transferred load of the bone around implants. The aim of the present study has been to analyse the influence of framework materials on the transferred load to the implant system and the surrounding bone. A finite element model of a long-span cementable implant-supported fixed prosthesis was created with two coping layers (gold and hybrid composite) to optimise the fitting of the prosthesis to the abutments. Three framework materials were analysed: titanium, gold alloy, and zirconia. The connection screws were first preloaded with 200 N. The framework was then loaded with 500 N vertically and at 30° to the framework long axis. Two loading conditions were considered: at the mesial and distal boundaries of the framework and at the centre of the framework. The stresses and strains within the framework materials and bone bed around the supporting implants were analysed. The region and angle of load applications showed an obvious effect on the values of the stresses and strains within the framework itself and, consequently, their distribution in the implant system and surrounding bone. A correlation of the framework material and stresses of the coping materials was observed as well. The gold framework showed acceptable values of stress within the cortical bone (92 MPa and 89 MPa with 30° loading at two points and at the centre, respectively) in comparison to titanium (92 MPa and 113 MPa) and zirconia (88 MPa and 115 MPa).
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Affiliation(s)
- Istabrak Hasan
- Endowed Chair of Oral Technology, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany.
| | - Ludger Keilig
- Endowed Chair of Oral Technology, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany; Department of Prosthetic Dentistry, Preclinical Education and Materials Science, Dental School, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany
| | - Christoph Bourauel
- Endowed Chair of Oral Technology, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany
| | - Walter Lückerath
- Department of Prosthetic Dentistry, Preclinical Education and Materials Science, Dental School, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany
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S. Calderon P, M. C. Dantas P, C. L. Montenegro S, F. P. Carreiro A, G. R. C. Oliveira Â, M. Dantas E, C. V. Gurgel B. Technical complications with implant-supported dental prostheses. J Oral Sci 2014; 56:179-84. [DOI: 10.2334/josnusd.56.179] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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Alvarez A, Lafita P, de Llanos H, Gago A, Brizuela A, Ellacuria JJ. A Comparison of Two Soldering Techniques on the Misfit of Bar-Retained Implant-Supported Overdentures. J Prosthodont 2013; 23:163-70. [DOI: 10.1111/jopr.12083] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/14/2013] [Indexed: 11/29/2022] Open
Affiliation(s)
- Angel Alvarez
- Department of Prosthodontics and Occlusion, School of Dentistry; University of Oviedo; Oviedo Spain
| | - Pedro Lafita
- Department of Prosthodontics and Occlusion, School of Dentistry; University of Oviedo; Oviedo Spain
| | - Hector de Llanos
- Department of Prosthodontics and Occlusion, School of Dentistry; University of Oviedo; Oviedo Spain
| | - Angel Gago
- Department of Prosthodontics and Occlusion, School of Dentistry; University of Oviedo; Oviedo Spain
| | - Aritza Brizuela
- Department of Stomatology, School of Medicine and Dentistry; University of Basque Country; Leioa Spain
| | - Joseba J. Ellacuria
- Department of Stomatology, School of Medicine and Dentistry; University of Basque Country; Leioa Spain
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25
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Katsoulis J, Mericske-Stern R, Rotkina L, Zbären C, Enkling N, Blatz MB. Precision of fit of implant-supported screw-retained 10-unit computer-aided-designed and computer-aided-manufactured frameworks made from zirconium dioxide and titanium: anin vitrostudy. Clin Oral Implants Res 2012; 25:165-74. [DOI: 10.1111/clr.12039] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/06/2012] [Indexed: 11/30/2022]
Affiliation(s)
- Joannis Katsoulis
- Department of Prosthodontics; School of Dental Medicine; University of Bern; Bern Switzerland
- Department of Preventive and Restorative Sciences; School of Dental Medicine; Robert Schattner Center; University of Pennsylvania; Philadelphia PA USA
| | - Regina Mericske-Stern
- Department of Prosthodontics; School of Dental Medicine; University of Bern; Bern Switzerland
| | - Lolita Rotkina
- PENN Regional Nanotechnology Facility; School of Engineering and Applied Science; University of Pennsylvania; Philadelphia PA USA
- Ioffe Institute; St. Petersburg,Russian Federation
| | - Christoph Zbären
- Department of Preventive and Restorative Sciences; School of Dental Medicine; Robert Schattner Center; University of Pennsylvania; Philadelphia PA USA
| | - Norbert Enkling
- Department of Prosthodontics; School of Dental Medicine; University of Bern; Bern Switzerland
| | - Markus B. Blatz
- Department of Preventive and Restorative Sciences; School of Dental Medicine; Robert Schattner Center; University of Pennsylvania; Philadelphia PA USA
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