Evaluation of Vertical Misfit of CAD/CAM Implant-Supported Titanium and Zirconia Frameworks

Fontoura, Diego da Cunha; Barros, Vinícius de Magalhães; Magalhães, Cláudia Silami de; Vaz, Ricardo Rodrigues; Moreira, Allyson Nogueira

doi:10.11607/jomi.6320

Cited by 8 publications

(6 citation statements)

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“…In the included publications, more than half (27 out of 47 articles) described the implant‐framework misfit with 2D measurements, such as vertical (31 articles) 4,17‐45 and horizontal gaps (4 articles) at the margin, 18,43,44 as well as internal gaps between the mating surfaces (4 articles), 19‐21,46 by stereomicroscope and SEM in different experimental conditions (one‐screw test and definitive‐fit test). Besides, 18 articles demonstrated the implant framework misfit with 3D measurements, 6,18,22,38,42,45,47‐58 including the volumetric discrepancy 58 and spatial deviation in X ‐, Y ‐, and Z ‐axis 6,45,47,48,50,51,54‐56 .…”

Section: Resultsmentioning

confidence: 99%

“…A distinct advantage of this algorithm is that the vertical/horizontal misfit over the other implants measured from the virtual aligned prosthesis can be validated in vivo. On the other hand, some studies have used the “definitive fit test” with both screws over the terminal implants tightened instead before the misfit is assessed 22,25,32,34,44 . A study showed that the mean vertical gap of complete‐arch zirconia frameworks would be reduced from 107 μm to 5 μm if the one‐screw test was changed to the definitive‐fit test for misfit assessment 45 .…”

Section: Discussionmentioning

confidence: 99%

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Implant framework misfit: A systematic review on assessment methods and clinical complications

Pan

Tsoi

Lam

et al. 2020

Clin Implant Dent Rel Res

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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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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Implant framework misfit: A systematic review on assessment methods and clinical complications

Pan

Tsoi

Lam

et al. 2020

Clin Implant Dent Rel Res

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“…The use of zirconia as the material of choice for the final prosthesis proved beneficial in terms of mechanical properties ( 9 - 10 ) improved esthetics, adequate fit ( 11 ) and low bacterial adhesion ( 12 ). This was however achieved along with potential limitations including possible long-term hydrothermal degradation ( 13 ) and it’s difficulty to adjust/repair prostheses after sinterization ( 14 ).…”

Section: Discussionmentioning

confidence: 99%

A novel digital approach for fixed full-mouth implant-supported rehabilitations: A case report

et al. 2020

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Successful rehabilitation of a patient’s entire dentition with implant-supported fixed prostheses requires restoration of function, esthetics and comfort. To achieve this goal, the clinician and laboratory technician must work in concert with one another to navigate the multiple steps from the patient’s initial evaluation to delivery of the final prostheses. Key to this is the ability of the clinician to provide the technician with detailed information regarding the patient’s extra- and intraoral characteristics in a manner that can be easily and accurately transferred to the lab bench where it then serves as the foundation for reconstruction of the dentition. In recent years, the impressive evolution of digital technology in dentistry has dramatically facilitated this complex process. The aim of this case report is to illustrate how digital profiles of a patient’s facial and intraoral features can be merged with one another and used to generate artificial teeth and gingival tissue of a full mouth implant supported rehabilitation via computer-aided design and computer-aided manufacturing (CAD/CAM) technology to successfully rehabilitate a patient that initially presented with a terminal dentition. Key words: Facial scan, Zirconia, Implant-supported rehabilitation, Implant-supported prosthesis, Fixed prosthesis, Oral rehabilitation.

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“…10 Computer-aided design/computer-aided manufacturing (CAD/CAM) can also be used to fabricate implantsupported frameworks. 11,12 This technique has provided significant improvement in the marginal adaption of frameworks, 13 and may result in better stress distribution as compared to frameworks manufactured using traditional laboratory procedures. Although the CAD/CAM technology eliminates several steps, it introduces others, such as scanning, intricate software utilization, design, and machining, which also depend on the experience of the operator and the equipment used.…”

Section: Introductionmentioning

confidence: 99%

Influence of the frameworks of implant-supported prostheses and implant connections on stress distribution

Tonin,

Peixoto,

et al. 2023

Dent. Med. Probl.

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Background. The maintenance of marginal bone integrity around dental implants continues to be a clinical challenge. It is still unclear whether loading multiple implant-supported prostheses that have different implant connections influences bone resorption.Objectives. The aim of this in vitro study was to compare stress distribution around residual edentulous ridges supported by external hexagon (EH) and Morse taper (MT) implants with screw-retained frameworks obtained with the use of different methods.Material and methods. Three-element implant-supported prostheses with distal cantilevers were manufactured according to different techniques of obtaining the framework: LAS -framework sectioned and welded with a laser; TIG -framework sectioned and welded with tungsten inert gas (TIG); and CCS -framework obtained using a computer-aided design/computer-aided manufacturing (CAD/CAM) system. Occlusal and punctual loading (150 N) was applied to the cantilevers. In the photoelastic stress analysis, the fringe orders (n) were quanitified using the Tardy method, which calculates the maximum shear stress value (τ) at each selected point.Results. High stress around the implants and tightening were observed in the TIG group, mainly in the crestal bone region for the EH and MT implant connections. The LAS and CCS frameworks exhibited lower stress for the MT connection under occlusal and punctual loading.Conclusions. The comparative analysis of the models showed that the MT connection type associated with the laser-welded or CAD/CAM frameworks resulted in lower stress values in the crestal bone area, suggesting the preservation of bone tissue in this region.

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Evaluation of Vertical Misfit of CAD/CAM Implant-Supported Titanium and Zirconia Frameworks

Abstract: Within the limitations of this study, there was no significant difference in vertical misfit between the titanium and zirconia implant frameworks produced using the CAD/CAM system. Regardless of the material used, the CAD/CAM frameworks achieved an adequate vertical fit.

Cited by 8 publications

References 0 publications

Implant framework misfit: A systematic review on assessment methods and clinical complications

Implant framework misfit: A systematic review on assessment methods and clinical complications

A novel digital approach for fixed full-mouth implant-supported rehabilitations: A case report

Influence of the frameworks of implant-supported prostheses and implant connections on stress distribution

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