Porcelain fracture of metal-ceramic tooth-supported and implant-supported restorations: A review

Shadid, Rola Muhammed; Sadaqah, Nasrin R.; Abu-Naba’a, Layla; Al-Omari, Wael M

doi:10.4236/ojst.2013.38069

Cited by 13 publications

(9 citation statements)

References 49 publications

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“…(7,10) Misfiting implant cemented restorations can lead to biomechanical failure, components fracture or even bone loss. (2,16) Studies evaluating the marginal adaptation of fixed restorations on teeth or implants suggest different methods of measuring marginal discrepancy between the restoration margins and abutment tooth or implant abutment. Of these, the direct microscopic, sectioning and replica methods were mostly preferred.…”

Section: Discussionmentioning

confidence: 99%

“…(1) Although most of the concentration today is on allceramic restorations, metal ceramic restorations, whether they are tooth supported or implant supported, are still considered as the gold standard because of their excellent biocompatibility, consistent esthetics,superior strength and marginal adaptation. (2) The production of the metallic framework in the dental laboratory has been carried out using the lost wax casting technique. (3) Although the alloys of choice were gold-based when the casting technique was first developed, they were gradually replaced by base-metal alloys such as nickel-chromium (Ni-Cr) and cobalt-chromium (Co-Cr).…”

Section: Introductionmentioning

confidence: 99%

“…(11,(19)(20)(21) Another crucial factors for the long term success of implant supported metal ceramic restoration are their mechanical resistance and structural integrity in the oral cavity. (2) The mechanical response of the functionally loaded metal ceramic restoration is dependent on the mechanical properties of the supporting metal core which rely on material composition and production method. Results from in vitro study carried out by Suliman and Steyern (22) showed that there is no difference in fracture strength of metal ceramic restorations with copings fabricated from Co-Cr using different production technologies (casting, milling and laser sintering).…”

Section: Introductionmentioning

confidence: 99%

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Influence of Cobalt Chromium Framework Fabrication Techniques on Marginal Accuracy and Fracture Behavior of Implant-Supported Metal Ceramic Bridges

Sallam

2017

Egyptian Dental Journal

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Statement of problem: Marginal fit and structural integrity are keys for long term success of implant supported restorations. Little information is available regarding precision of marginal adaptation and fracture behavior of implant supported metal ceramic bridges with recently introduced milled Cobalt Chromium frameworks. Aim of the study: Evaluation of marginal accuracy (before and after porcelain application) and fracture resistance of implant supported metal ceramic bridges with Cobalt Chromium (Co-Cr) frameworks fabricated using the new computer aided designing /computer aided manufacturing (CAD/CAM, soft milling/post sintering) technique in comparison to the conventional casting technique. Materials & Methods: A total of 10 epoxy resin models were constructed into which two titanium dummy implants were inserted in each model and received straight titanium abutments. 10 Co-Cr cement retained frameworks were fabricated on the implant models, 5 with the new CAD/ CAM soft milling/ post sintering technique (group I) and the other 5 with the lost wax casting technique (group II). All frameworks were veneered with porcelain by the layering technique. Vertical marginal gap distance between the Co-Cr frameworks and the implant abutments was measured using a stereo microscope at 16 predetermined points/abutment before and after porcelain application. Then metal ceramic bridges were cemented onto their corresponding abutments with temporary resin cement. Samples were loaded compressively under static vertical load till fracture in a universal testing machine with a loadcell of 5 kN at a cross-head speed of 1 mm/min. The load required to fracture was recorded in Newton. Fracture modes of all samples were visually analyzed. Data were statistically analyzed using the repeated measures ANOVA test for vertical marginal gap distance results (P<0.05) and the students t-test for fracture resistance results (P < 0.05). Results: Framework fabrication techniques as well as porcelain application was statistically insignificantly affecting the vertical marginal gap distance as indicated by the repeated measures ANOVA test (P>0.05). Bridges with CAD/CAM fabricated frameworks recorded (1056)

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Cobalt Chromium Framework Fabrication Techniques on Marginal Accuracy and Fracture Behavior of Implant-Supported Metal Ceramic Bridges

Sallam

2017

Egyptian Dental Journal

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“…The presence of an access hole to the screw in the occlusal surface of screwed restorations significantly reduces ceramic resistance to fractures, as the head of the screw or the restorative composite material with which part of the hole is covered occupies from 50% to 66% of intercuspal distance. 20 In other words, there is still a minimum width of ceramics around the opening access to the screw that increases the chances of fracture. In addition, the remaining hole indicates the interruption of structural continuity of ceramics, leading to changes on its center positioning through which the material choses during the sintering process.…”

Section: Summary Of the Findingsmentioning

confidence: 99%

Prosthetics on implants: cement or screw-retained? A review of the literature

Relvas¹,

Fellows²,

Sotelo³

et al. 2018

CRORJ

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Introduction: The discovery of titanium osseointegrated implants enabled the development of screw or cement-retained dental prostheses. However, each retention method involves different aspects. Objective: this study aims at reviewing the literature of in vitro and in vivo studies of the last 7 years on the mechanical, biological, aesthetic and occlusal properties and the cost of screw and cementretained prostheses to identify what can promote greater longevity and economy by considering the patient's clinical framework. Data sources: Our method was based on the collection of scientific articles published in English from 2012 to 2018 in the PubMed database. Summary of the findings: we noted that in some clinical cases, a retention method was more appropriate than the other, as seen in the access to the posterior region or the palatal face of the crowns, the position/ angulation of implants in the anterior region, the patient's health and economic conditions. Both protheses can suffer or not from mechanical and biological complications. Reversibility can also be associated to cement-retained protheses. There are alternatives to screwed prosthetics to achieve satisfactory aesthetics in the anterior region despite being more expensive. Ideal occlusion tends to be more easily achieved by cemented prosthesis as it avoids prosthetics screws and the formation of crown holes, despite the contributions of correct planning followed by the analysis of static and in motion occlusions. Conclusion: each retention method has its advantages and disadvantages. Therefore,the best method is the one that best fits the characteristics and needs of each patient.

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“…Recently, Kaleli et al [22] demonstrated that Co-Cr dental alloy fabricated via SLM had significantly higher bond strength than cast alloy. In metal-ceramic restorations, another frequent reason for porcelain fracture is the lack of rigidity and the distortion of the metal substructure [23]. Therefore, mechanical anisotropy should also be taken into consideration when a metal substructure for a metal-ceramic restoration is built.…”

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confidence: 99%

Fabricating High-Quality 3D-Printed Alloys for Dental Applications

2017

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Featured Application: This article will help to find main points to be considered while applying selective laser melting technology in dentistry.Abstract: Metal additive manufacturing (AM), especially selective laser melting (SLM), has been receiving particular attention because metallic functional structures with complicated configurations can be effectively fabricated using the technique. However, there still exist some future challenges for the fabrication of high-quality SLM products for dental applications. First, the surface quality of SLM products should be further improved by standardizing the laser process parameters or by appropriately post-treating the surface. Second, it should be guaranteed that dental SLM restorations have good dimensional accuracy and, in particular, a good marginal fit. Third, a definitive standard regarding building and scanning strategies, which affect the anisotropy, should be established to optimize the mechanical properties and fatigue resistance of SLM dental structures. Fourth, the SLM substructure's bonding and support to veneering ceramic should be further studied to facilitate the use of esthetic dental restorations. Finally, the biocompatibility of SLM dental alloys should be carefully examined and improved to minimize the potential release of toxic metal ions from the alloys. Future research of SLM should focus on solving the above challenges, as well as on fabricating dental structures with "controlled" porosity.Keywords: additive manufacturing; anisotropy; dental alloy; selective laser melting Additive manufacturing (AM), also known as three-dimensional (3D) printing or rapid prototyping, is the process of joining materials to make 3D objects from digital data, usually layer upon layer [1,2]. Metal AM, especially selective laser melting (SLM), has been receiving particular attention because metallic functional structures with complicated configurations in various industrial, medical, and dental sectors can now be fabricated using this technique [1][2][3]. However, due to the complex nature of metal AM, there still exist many challenges for the successful fabrication of high-quality metallic products with favorable microstructures and properties [3]. In particular, several challenges need to be solved in order to apply the SLM technology widely in dental applications, replacing conventional techniques such as casting [1].It has been known that the SLM technique can produce 3D objects with minimal pre-processing and/or post-processing requirements [3]. In reality, however, the supporting structure created in the manufacturing stage must be manually removed after the final 3D product is completed [2,4].

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Porcelain fracture of metal-ceramic tooth-supported and implant-supported restorations: A review

Cited by 13 publications

References 49 publications

Influence of Cobalt Chromium Framework Fabrication Techniques on Marginal Accuracy and Fracture Behavior of Implant-Supported Metal Ceramic Bridges

Influence of Cobalt Chromium Framework Fabrication Techniques on Marginal Accuracy and Fracture Behavior of Implant-Supported Metal Ceramic Bridges

Prosthetics on implants: cement or screw-retained? A review of the literature

Fabricating High-Quality 3D-Printed Alloys for Dental Applications

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