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Zirconia abutment

Adham Elsayed, Sebastian Wille, Majed Al-Akhali, Matthias Kern
STATEMENT OF PROBLEM: The whitish color of zirconia (ZrO2) abutments offers favorable esthetics compared with the grayish color of titanium (Ti) abutments. Nonetheless, ZrO2 has greater opacity, making it difficult to achieve natural tooth color. Therefore, lithium disilicate (LaT) abutments have been suggested to replace metal abutments. PURPOSE: The purpose of this in vitro study was to evaluate the fracture strength and failure mode of single-tooth implant restorations using ZrO2 and LaT abutments, and to compare them with titanium (Ti) abutments...
October 18, 2016: Journal of Prosthetic Dentistry
Fernanda Campos, Rodrigo Oa Souza, Marco A Bottino, Mutlu Özcan
The required connector dimension for zirconia fixed dental prostheses (FDPs) may be a clinical limitation due to limited space in the occlusogingival direction. Using no veneering in the gingival regions of the pontics and connectors may solve this problem. This study evaluated the mechanical durability of zirconia FDPs with and without veneering in the gingival area of the connectors and pontics and subsequent air abrasion of this region with different protocols. Models were made of resin abutments (diameter = 6 or 8 mm, height = 6 mm, 6 degrees convergence) and embedded in polyurethane resin (distance = 11 mm)...
November 2016: International Journal of Periodontics & Restorative Dentistry
Danilo Gonzaga de França, Maria Helena Morais, Flávio D das Neves, Adriana Fonte Carreiro, Gustavo As Barbosa
PURPOSE: The aim of this study was to evaluate the effectiveness of fabrication methods (computer-aided design/computer-aided manufacture [CAD/CAM], copy-milling, and conventional casting) in the fit accuracy of three-unit, screw-retained fixed dental prostheses. MATERIALS AND METHODS: Sixteen three-unit implant-supported screw-retained frameworks were fabricated to fit an in vitro model. Eight frameworks were fabricated using the CAD/CAM system, four in zirconia and four in cobalt-chromium...
October 5, 2016: International Journal of Oral & Maxillofacial Implants
Diego Lops, Edoardo Stellini, Luca Sbricoli, Niccolò Cea, Eugenio Romeo, Eriberto Bressan
PURPOSE: The aim of the present clinical trial was to analyze, through spectrophotometric digital technology, the influence of the abutment material on the color of the peri-implant soft tissue in patients with thin gingival biotype. MATERIAL AND METHODS: Thirty-seven patients received an endosseous dental implant in the anterior maxilla. At time of each definitive prosthesis delivery, an all-ceramic crown has been tried on gold, titanium and zirconia abutment. Peri-implant soft-tissue color has been measured through a spectrophotometer after the insertion of each single abutment...
October 3, 2016: Clinical Oral Implants Research
Juan Blanco, Leticia Caneiro, Antonio Liñares, Pilar Batalla, Fernando Muñoz, Isabel Ramos
OBJECTIVE: The aim of this study was to evaluate the soft tissue histomorphometric composition around implant abutments comparing two different materials, titanium (Ti) and zirconia (ZrO2 ). MATERIAL AND METHODS: Twelve implants were placed at bone level in the mandible of six beagle dogs (one in each side). At the same day of surgery one titanium abutment was screwed to the implant in one side (control group) and a zirconia abutment was screwed in the contralateral side...
October 2016: Clinical Oral Implants Research
Krysta Sellers, John M Powers, Sudarat Kiat-Amnuay
STATEMENT OF PROBLEM: The optimal retention of implant-supported ceramic crowns on zirconia abutments is a goal of prosthodontic treatment. PURPOSE: The purpose of this in vitro study was to evaluate the retentive strength of implant-supported IPS e.max CAD-CAM (e.max) crowns bonded to custom zirconia implant abutments with different cements. MATERIAL AND METHODS: An optical scan of a zirconia custom abutment and a complete-coverage modified crown was designed using an intraoral E4D scanner...
September 24, 2016: Journal of Prosthetic Dentistry
Nuno Calha, Ana Messias, Fernando Guerra, Beatriz Martinho, Maria Augusta Neto, Pedro Nicolau
PURPOSE: To evaluate the effect of geometry on the displacement and the strain distribution of anterior implant-supported zirconia frameworks under static load using the 3D digital image correlation method. METHODS: Two groups (n=5) of 4-unit zirconia frameworks were produced by CAD/CAM for the implant-abutment assembly. Group 1 comprised five straight configuration frameworks and group 2 consisted of five curved configuration frameworks. Specimens were cemented and submitted to static load up to 200N...
September 22, 2016: Journal of Prosthodontic Research
Anders Ekfeldt, Björn Fürst, Gunnar E Carlsson
OBJECTIVES: To evaluate the clinical outcome of custom-made zirconia abutments for implant-supported single-tooth restorations 10-11 years after insertion. MATERIAL AND METHODS: The study comprises a clinical examination of 23 patients with 30 restorations placed 10-11 years ago. Oral surgeons placed the implants. The prosthodontic treatment was provided at a prosthodontic specialist clinic. The restoration was either an all-ceramic crown for cementation or a screw-retained one-piece restoration with the veneering porcelain baked directly to the zirconia abutment...
September 24, 2016: Clinical Oral Implants Research
Hadi Mokhtarpour, Reza Eftekhar Ashtiani, Minoo Mahshid, Farhad Tabatabaian, Marzieh Alikhasi
Background. Fracture load of implant-supported restorations is an important factor in clinical success. This study evaluated the effect of two techniques for screw access hole preparation on the fracture load of cement-screw-retained implant-supported zirconia-based crowns. Methods. Thirty similar cement-screw-retained implant-supported zirconia-based maxillary central incisor crowns were evaluated in three groups of 10. Group NH: with no screw access holes for the control; Group HBS: with screw access holes prepared with a machine before zirconia sintering; Group HAS: with screw access holes prepared manually after zirconia sintering...
2016: Journal of Dental Research, Dental Clinics, Dental Prospects
Yen-Wei Chen, Joelle Moussi, Jeanie L Drury, John C Wataha
The use of zirconia in medicine and dentistry has rapidly expanded over the past decade, driven by its advantageous physical, biological, esthetic, and corrosion properties. Zirconia orthopedic hip replacements have shown superior wear-resistance over other systems; however, risk of catastrophic fracture remains a concern. In dentistry, zirconia has been widely adopted for endosseous implants, implant abutments, and all-ceramic crowns. Because of an increasing demand for esthetically pleasing dental restorations, zirconia-based ceramic restorations have become one of the dominant restorative choices...
October 2016: Expert Review of Medical Devices
Katja Nelson, Rainer Schmelzeisen, Thomas D Taylor, Simon Zabler, Wolfram Wiest, Tobias Fretwurst
PURPOSE: The purpose of this study was to visualize the mode and impact of force transmission in narrowdiameter implants with different implant-abutment designs and material properties and to quantify the displacement of the abutment. MATERIALS AND METHODS: Narrow-diameter implants from two manufacturers were examined: Astra 3.0-mm-diameter implants (Astra OsseoSpeed TX; n = 2) and Straumann Bone Level implants with a 3.3-mm diameter made of commercially pure titanium (cpTi) Gr...
September 2016: International Journal of Oral & Maxillofacial Implants
Luis Eduardo Butignon, Mariana de Almeida Basílio, Julia Sgavioli Santo, João Neudenir Arioli Filho
PURPOSE: Little information is available in the literature regarding the accuracy of marginal fit of abutments made from different materials. The aim of this study was to compare the level of vertical misfit in abutments made from different materials before and after cyclic loading. MATERIALS AND METHODS: Thirty external hexagon implants, 3.75-mm diameter and 13-mm length, were embedded in epoxy resin and divided into three groups according to abutment type (n = 10): (1) machined titanium (Ti) abutments; (2) premachined gold-alloy (Au) abutments; and (3) machined zirconia (Zr) abutments...
September 2016: International Journal of Oral & Maxillofacial Implants
Cláudia Lopes Brilhante Bhering, Marcelo Ferraz Mesquita, Daniel Takanori Kemmoku, Pedro Yoshito Noritomi, Rafael Leonardo Xediek Consani, Valentim Adelino Ricardo Barão
We evaluated two treatment concepts for the rehabilitation of moderate atrophic maxilla with dental implants (all-on-four and all-on-six) and the effect of framework material on the stress distribution of implant-support system. A three-dimensional finite element model based on a prototype was built to simulate an entirely edentulous maxilla with moderate sinus pneumatization that was rehabilitated with a full-arch fixed dental prosthesis. Four standard implants were positioned according to the all-on-four concept and four standard implants and two short implants were placed according to the all-on-six concept...
December 1, 2016: Materials Science & Engineering. C, Materials for Biological Applications
Khalil Shahramian, Heidi Leminen, Ville Meretoja, Paula Linderbäck, Ilkka Kangasniemi, Lippo Lassila, Aous Abdulmajeed, Timo Närhi
The purpose of this study was to evaluate the effect of sol-gel derived bioactive coatings on the biaxial flexural strength and fibroblast proliferation of zirconia, aimed to be used as an implant abutment material. Yttrium stabilized zirconia disc-shaped specimens were cut, ground, sintered, and finally cleansed ultrasonically in each of acetone and ethanol for 5 minutes. Three experimental groups (n = 15) were fabricated, zirconia with sol-gel derived titania (TiO2 ) coating, zirconia with sol-gel derived zirconia (ZrO2 ) coating, and non-coated zirconia as a control...
September 7, 2016: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
Wolfgang Bömicke, Stefan Rues, Verena Hlavacek, Peter Rammelsberg, Marc Schmitter
OBJECTIVES: To compare ultimate fracture load (Fu ), load at first damage (F1d ), and fracture pattern for posterior fixed dental prostheses (FDPs) manufactured from translucent, yttria-stabilized zirconia polycrystal. METHODS: Premolar-size FDPs in 4 test groups (n = 16/group) were constructed as veneered complete crown-retained (group 1), monolithic complete crown-retained (group 2), monolithic partial veneer crown-retained (group 3), or monolithic resin-bonded (group 4) prostheses with minimum zirconia wall thickness (0...
August 26, 2016: Journal of Esthetic and Restorative Dentistry
Janghyun Paek, Kwantae Noh, Ahran Pae, Hyeonjong Lee, Hyeong-Seob Kim
Fabricating a surveyed prosthesis beneath an existing partial removable dental prosthesis (PRDP) is a challenging and time-consuming procedure. The computer-aided design/computer-assisted manufacturing (CAD/CAM) technology was applied to fabricate a retrofitted, surveyed zirconia prosthesis to an existing PRDP. CAD/CAM technology enabled precise and easy replication of the contour of the planned surveyed crown on the existing abutment tooth. This technology ensured excellent adaptation and fit of newly fabricated crown to the existing PRDP with minimal adjustments...
August 2016: Journal of Advanced Prosthodontics
Cláudıa Ângela Mazıero Volpato, Paulo Francısco Cesar, Marco Antônıo Bottıno
OBJECTIVE: This study evaluated the influence of different aging times on the color stability of zirconia that is either veneered or not by ceramic. MATERIALS AND METHODS: Fifteen zirconia disks (3Y-TZP) were produced (12.0 mm in diameter and 1.0 mm-thick). Five disks (G1) did not receive veneering ceramic layer; 5 disks (G2) were veneered with 1.0 mm a ceramic layer and the other 5 disks (G3) were veneered with layer of 1.5 mm. The L*a*b* coordinates (T1) were measured with a spectrophotometer...
September 2016: Journal of Esthetic and Restorative Dentistry
Armin Kammermeier, Martin Rosentritt, Michael Behr, Sibylle Schneider-Feyrer, Verena Preis
OBJECTIVES: To investigate the long-term in vitro performance and fracture resistance of one-piece and bonded two-piece zirconia implant systems for anterior application. METHODS: Two groups of bonded two-piece zirconia (ZZB), four groups of one-piece zirconia (Z), and two groups of two-piece titanium (TTS, reference) implant systems were restored with identical monolithic zirconia crowns (n=10/group). Eight specimens per group were mounted at an angle of 135° in the chewing simulator and subjected to thermal cycling (TC:18,000 cycles; 5°/55°) and mechanical loading (ML:3...
October 2016: Journal of Dentistry
Matthias Karl, Thomas D Taylor
PURPOSE: Cyclic loading may cause settling of abutments mounted on dental implants, potentially affecting screw joint stability and implant-abutment micromotion. It was the goal of this in vitro study to compare micromotion of implant-abutment assemblies before and after masticatory simulation. MATERIALS AND METHODS: Six groups of abutments (n = 5) for a specific tissue-level implant system with an internal octagon were subject to micromotion measurements. The implant-abutment assemblies were loaded in a universal testing machine, and an apparatus and extensometers were used to record displacement...
August 15, 2016: International Journal of Oral & Maxillofacial Implants
Marco Ferrari, Michele Carrabba, Alessandro Vichi, Cecilia Goracci, Maria Crysanti Cagidiaco
PURPOSE: Zirconia (ZrO₂) and titanium nitride (TiN) implant abutments were introduced mainly for esthetic purposes, as titanium's gray color can be visible through mucosal tissues. This study was aimed at assessing whether ZrO₂ and TiN abutments could achieve better esthetics in comparison with titanium (Ti) abutments, regarding the appearance of soft tissues. MATERIALS AND METHODS: Ninety patients were included in the study. Each patient was provided with an implant (OsseoSpeed, Dentsply Implant System)...
August 15, 2016: International Journal of Oral & Maxillofacial Implants
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