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Zirconia abutment

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https://www.readbyqxmd.com/read/27927884/esthetic-and-clinical-performance-of-implant-supported-all-ceramic-crowns-made-with-prefabricated-or-cad-cam-zirconia-abutments-a-randomized-multicenter-clinical-trial
#1
J G Wittneben, J Gavric, U C Belser, M M Bornstein, T Joda, V Chappuis, I Sailer, U Brägger
Patients' esthetic expectations are increasing, and the options of the prosthetic pathways are currently evolving. The objective of this randomized multicenter clinical trial was to assess and compare the esthetic outcome and clinical performance of anterior maxillary all-ceramic implant crowns (ICs) based either on prefabricated zirconia abutments veneered with pressed ceramics or on CAD/CAM zirconia abutments veneered with hand buildup technique. The null hypothesis was that there is no statistically significant difference between the 2 groups...
December 7, 2016: Journal of Dental Research
https://www.readbyqxmd.com/read/27915156/fracture-resistance-of-zirconia-based-implant-abutments-after-artificial-long-term-aging
#2
Abdulaziz Alsahhaf, Benedikt Christopher Spies, Kirstin Vach, Ralf-Joachim Kohal
OBJECTIVE: To investigate the survival rate, fracture strength, bending moments, loading to fracture and fracture modes of different designs of zirconia abutments after dynamic loading with thermocycling, and compare these values to titanium abutments. METHODS: A total of 80 abutment samples were divided into 5 test groups of 16 samples in each group. The study included the following groups, "Group 1" CAD/CAM produced all-zirconia abutments, "Group 2" titanium abutments, "Group 3" zirconia-abutments adhesively luted to a titanium base, "Group 4" prefabricated all-zirconia abutments and "Group 5" zirconia-abutments glass soldered to a titanium base...
November 21, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/27890357/effect-of-cement-space-on-stress-distribution-in-y-tzp-based-crowns
#3
Carlos Eduardo Edwards Rezende, Ana Flávia Sanches Borges, Carla Castiglia Gonzaga, Yuanyuan Duan, José Henrique Rubo, Jason Alan Griggs
OBJECTIVE: To evaluate the stress distribution in bi-layered Y-TZP based crowns, according to the occlusal internal spacing between coping and abutment. METHODS: Twelve premolar shaped Y-TZP copings were made by a CAD/CAM system and seated on an abutment to evaluate the internal fit at the occlusal third using micro-CT images. Considering the fitting range obtained experimentally, two 3D finite element models, consisting on bone tissue, a titanium implant, a zirconia abutment, cement layer and a bi-layered Y-TZP ceramic crown were constructed based on the micro-CT images, one corresponding to the thinnest cement space and other representing the specimen with the thickest cement space obtained experimentally...
November 24, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27881319/influence-of-remaining-tooth-structure-and-restorative-material-type-on-stress-distribution-in-endodontically-treated-maxillary-premolars-a-finite-element-analysis
#4
Junxin Zhu, Qiguo Rong, Xiaoyan Wang, Xuejun Gao
STATEMENT OF PROBLEM: How tooth preparation and material type affect the stress distribution of endodontically treated teeth restored with endocrowns remains unclear. PURPOSE: The purpose of this finite element (FE) study was to determine the influence of the quantity of remaining dental tissues and material type on stress distribution in endodontically treated maxillary premolars using 3-dimensional FE analysis. MATERIAL AND METHODS: Five 3-dimensional FE models were constructed on the basis of the restorative methods used and the quantity of preserved tooth tissues: a sound maxillary premolar, an endodontically treated maxillary premolar restored with composite resin, and endodontically treated maxillary premolars restored with endocrowns with thicknesses of 1...
October 27, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27878464/impact-of-abutment-material-on-peri-implant-soft-tissue-color-an-in-vitro-study
#5
Sala Leticia, Bascones-Martínez Antonio, Carrillo-de-Albornoz Ana
OBJECTIVES: The objectives of the present study is to determine the differences in peri-implant soft tissue color with the utilization of titanium, titanium gold-plated, white zirconia, Vita Classical (VC) A4-shaded zirconia, and fluorescent white zirconia abutments and to establish the influence of gingival thickness on the resulting color. METHODS: Four implants were contralaterally inserted in 19 fresh pig mandibles, and the color of the peri-implant mucosa with the different abutments was spectrophotometrically measured at 1-, 2-, and 3-mm height from the margin...
November 22, 2016: Clinical Oral Investigations
https://www.readbyqxmd.com/read/27863857/retention-and-wear-behaviors-of-two-implant-overdenture-stud-type-attachments-at-different-implant-angulations
#6
Jae-Won Choi, Ji-Hyeon Bae, Chang-Mo Jeong, Jung-Bo Huh
STATEMENT OF PROBLEM: Implant angulation should be considered when selecting an attachment. Some in vitro studies have investigated the relationship between implant angulation and changes in the retention force of the stud attachment, but few studies have evaluated the effect of cyclic loading and repeated cycles of insertion and removal on the stud attachment. PURPOSE: The purpose of this in vitro study was to evaluate the effects of implant angulation on the retentive characteristics of overdentures with 2 different stud attachments, an experimental system and O-rings in red and orange, after cyclic loading and repeated insertion and removal cycles...
November 15, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27861648/fracture-resistance-of-straight-and-angulated-zirconia-implant-abutments-supporting-anterior-three-unit-lithium-disilicate-fixed-dental-prostheses
#7
Samah Saker, Sameh El-Shahat, Mohamed Ghazy
PURPOSE: The purpose of this study was to evaluate fracture resistance of straight and angulated zirconia implant abutments supporting anterior three-unit lithium disilicate fixed dental prostheses (FDPs). MATERIALS AND METHODS: Four different test groups (n = 8) representing anterior three-unit implant-supported all-ceramic FDPs were fabricated to fit an in vitro model with two implants. Groups 1 and 2 simulated a clinical situation with an ideal implant position for maxillary left central and right lateral incisors from a prosthetic point of view, which allowed for the use of a straight, prefabricated zirconia and titanium abutment...
November 2016: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/27848100/stress-distribution-difference-between-lava-ultimate-full-crowns-and-ips-e-max-cad-full-crowns-on-a-natural-tooth-and-on-tooth-shaped-implant-abutments
#8
Ivo Krejci, René Daher
The goal of this short communication is to present finite element analysis comparison of the stress distribution between CAD/CAM full crowns made of Lava Ultimate and of IPS e.max CAD, adhesively luted to natural teeth and to implant abutments with the shape of natural teeth. Six 3D models were prepared using a 3D content-creating software, based on a micro-CT scan of a human mandibular molar. The geometry of the full crown and of the abutment was the same for all models representing Lava Ultimate full crowns (L) and IPS e...
November 15, 2016: Odontology
https://www.readbyqxmd.com/read/27836144/managing-a-fractured-one-piece-zirconia-abutment-with-a-modified-plastic-periodontal-probe-a-clinical-report
#9
Paola C Saponaro, Damian J Lee, Edwin A McGlumphy
This clinical report describes the management of a fractured 1-piece zirconia stock abutment from an implant with an internal connection using a modified plastic periodontal probe. This minimally invasive approach allows for the retrieval of fractured prosthetic components without causing irreversible damage to the implant's platform or its internal threads and does not require special equipment or costly instruments.
November 8, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27836140/load-to-failure-of-different-zirconia-implant-abutments-with-titanium-components
#10
Faye Mascarenhas, Burak Yilmaz, Edwin McGlumphy, Nancy Clelland, Jeremy Seidt
STATEMENT OF PROBLEM: Abutments with a zirconia superstructure and a titanium insert have recently become popular. Although they have been tested under static load, their performance under simulated mastication is not well known. PURPOSE: The purpose of this in vitro study was to compare the cyclic load to failure of 3 types of zirconia abutments with different mechanisms of retention of the zirconia to the titanium interface. MATERIAL AND METHODS: Fifteen implants (n=5 per system) and abutments (3 groups: 5 friction fit [Frft]; 5 bonded; and 5 titanium ring friction fit [Ringfrft]) were used...
November 9, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27769518/comparison-of-fracture-strength-and-failure-mode-of-different-ceramic-implant-abutments
#11
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
https://www.readbyqxmd.com/read/27740655/fracture-strength-failure-types-and-weibull-characteristics-of-three-unit-zirconia-fixed-dental-prostheses-after-cyclic-loading-effects-of-veneering-and-air-abrasion-protocols
#12
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
https://www.readbyqxmd.com/read/27706265/precision-fit-of-screw-retained-implant-supported-fixed-dental-prostheses-fabricated-by-cad-cam-copy-milling-and-conventional-methods
#13
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
https://www.readbyqxmd.com/read/27699895/influence-of-abutment-material-on-peri-implant-soft-tissues-in-anterior-areas-with-thin-gingival-biotype-a-multicentric-prospective-study
#14
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
https://www.readbyqxmd.com/read/27699885/peri-implant-soft-tissue-analyses-comparing-ti-and-zro2-abutments-an-animal-study-on-beagle-dogs
#15
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
https://www.readbyqxmd.com/read/27677215/retentive-strength-of-implant-supported-cad-cam-lithium-disilicate-crowns-on-zirconia-custom-abutments-using-6%C3%A2-different-cements
#16
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
https://www.readbyqxmd.com/read/27667555/effect-of-geometry-on-deformation-of-anterior-implant-supported-zirconia-frameworks-an-in-vitro-study-using-digital-image-correlation
#17
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
https://www.readbyqxmd.com/read/27663724/zirconia-abutments-for-single-tooth-implant-restorations-a-10-to-11-year-follow-up-study
#18
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
https://www.readbyqxmd.com/read/27651885/effect-of-screw-access-hole-preparation-on-fracture-load-of-implant-supported-zirconia-based-crowns-an-in-vitro-study
#19
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
https://www.readbyqxmd.com/read/27635794/zirconia-in-biomedical-applications
#20
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
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