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Zirconia abutment

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https://www.readbyqxmd.com/read/29340353/clinical-performance-of-one-piece-screw-retained-implant-crowns-based-on-hand-veneered-cad-cam-zirconia-abutments-after-a-mean-follow-up-period-of-2-3-years
#1
Nicole Schnider, Fiona Alena Forrer, Urs Brägger, Stefan Paul Hicklin
PURPOSE: The aim of this study was to evaluate the clinical performance of one-piece, screw-retained implant crowns based on hand-veneered computer-aided design/computer-aided manufacture (CAD/CAM) zirconium dioxide abutments with a crossfit connection at least 1 year after insertion of the crown. MATERIALS AND METHODS: Consecutive patients who had received at least one Straumann bone level implant and one-piece, screw-retained implant crowns fabricated with CARES zirconium dioxide abutments were reexamined...
January 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29336173/genome-analysis-and-clinical-implications-of-the-bacterial-communities-in-early-biofilm-formation-on-dental-implants-restored-with-titanium-or-zirconia-abutments
#2
Flávia Correa Raffaini, Alice Ramos Freitas, Thalisson Saymo Oliveira Silva, Tarsis Cavagioni, Jessica Felix Oliveira, Rubens Ferreira Albuquerque Junior, Vinícius Pedrazzi, Ricardo Faria Ribeiro, Cássio do Nascimento
This cross-sectional study aimed to identify and quantify up to 42 target species colonizing the early biofilm of dental implants restored with titanium or zirconia abutments. A total of 720 samples from 20 healthy individuals were investigated. Biofilm samples were collected from the peri-implant sulci, inner parts of implants, abutment surfaces and prosthetic crowns over a functioning period of 30 days. Checkerboard DNA-DNA hybridization was used for microbial detection and quantitation. Clinical characteristics (probing depth, bleeding on probing, clinical attachment level and marginal bone loss) were also investigated during the monitoring period...
January 16, 2018: Biofouling
https://www.readbyqxmd.com/read/29311501/retrospective-clinical-evaluation-of-posterior-monolithic-zirconia-restorations-after-1-to-3-5-years-of-clinical-service
#3
Hiroto Gunge, Yoichiro Ogino, Masafumi Kihara, Yoshihiro Tsukiyama, Kiyoshi Koyano
This retrospective study analyzed clinical outcomes of monolithic zirconia restorations (MZRs) and factors related to restoration success. Patient records were searched to identify those provided MZRs (Cercon ht) for premolars or molars between April 2012 and March 2016. All MZRs were placed according to a standardized protocol. Kaplan-Meier analysis was used to assess MZR performance and failure after recall appointments at 1 year or later. In total, 101 patients received 148 MZRs. Mean duration of follow-up was 25...
December 28, 2017: Journal of Oral Science
https://www.readbyqxmd.com/read/29303758/response-of-soft-tissue-to-different-abutment-materials-with-different-surface-topographies-a-review-of-the-literature
#4
Feras Al Rezk, Georgia Trimpou, Hans-Christoph Lauer, Paul Weigl, Nadine Krockow
Soft tissue integration in the transmucosal zone of dental abutments supports the peri-implant tissues, improves esthetics, ensures soft tissue seal against microorganisms, and preserves crestal bone level. The aim of this literature review was to define the most favorable surface topography and macrodesign of the transmucosal zone of abutments to achieve optimal soft tissue seal. An electronic search of the PubMed/MEDLINE database was performed, seeking relevant English-language articles published between January 1, 2003, and October 11, 2014...
January 2018: General Dentistry
https://www.readbyqxmd.com/read/29288505/bone-response-to-functionally-loaded-two-piece-zirconia-implants-a-preclinical-histometric-study
#5
Simone F M Janner, Michael Gahlert, Dieter D Bosshardt, Stefan Roehling, Stefan Milz, Frank Higginbottom, Daniel Buser, David L Cochran
OBJECTIVE: To evaluate the bone response to a two-piece zirconia implant in comparison with a control titanium implant in the canine mandible 4 and 16 weeks after restoration. MATERIAL AND METHODS: Zirconia and titanium implants were alternately placed bilaterally in healed mandibular molar and premolar sites of five canines. Full-ceramic single-tooth restorations were cemented after 6 weeks of transmucosal healing, allowing for full functional loading of the implants...
December 30, 2017: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/29279761/load-bearing-capacity-of-various-cad-cam-monolithic-molar-crowns-under-recommended-occlusal-thickness-and-reduced-occlusal-thickness-conditions
#6
Sulki Choi, Hyung-In Yoon, Eun-Jin Park
PURPOSE: The goal of this study was to evaluate the fracture resistances of various monolithic crowns fabricated by computer-aided design and computer-aided manufacturing (CAD/CAM) with different thickness. MATERIALS AND METHODS: Test dies were fabricated as mandibular molar forms with occlusal reductions using CAD/CAM. With different occlusal thickness (1.0 or 1.5 mm), a polymer-infiltrated ceramic network (Enamic, EN), and zirconia-reinforced lithium silicate (Suprinity, SU and Celtra-Duo, CD) were used to fabricate molar crowns...
December 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/29279567/effects-of-cleaning-methods-for-custom-abutment-surfaces-on-gene-expression-of-human-gingival-fibroblasts
#7
Kazunori Nakajima, Tetsurou Odatsu, Ayano Shinohara, Koumei Baba, Yasuaki Shibata, Takashi Sawase
The aim of this study was to develop an effective method for cleaning implant abutments made by computer-aided design and computer-aided manufacturing techniques and to investigate the effect of decontamination in vitro. Briefly, a newly developed reagent (PK) and/or vacuum plasma (Plasma) were used to clean the surfaces of zirconia disks, and the effects of this decontamination were evaluated by X-ray photoelectron spectroscopy. Human gingival fibroblasts (HGFs) were cultured on sample disks for 6, 24, and 48 h...
2017: Journal of Oral Science
https://www.readbyqxmd.com/read/29274479/sub-surface-assessment-of-hydrothermal-ageing-in-zirconia-containing-femoral-heads-for-hip-joint-applications
#8
L Gremillard, J Chevalier, L Martin, T Douillard, S Begand, K Hans, T Oberbach
Zirconia-based materials have been used in orthopaedics since the 1980s, with large success, mainly thanks to transformation toughening. On the other hand, their main drawback is their potential sensitivity to hydrothermal ageing, i.e. tetragonal to monoclinic phase transformation on their surface in the presence of water. Hydrothermal ageing may result in roughness increase and microcracking of the surface. In this article the hydrothermal ageing behaviour of three medical-grade zirconia-based materials is assessed at high temperature and extrapolated to room or body temperature...
December 20, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29261853/metal-free-materials-for-fixed-prosthodontic-restorations
#9
REVIEW
Carlo E Poggio, Carlo Ercoli, Lorena Rispoli, Carlo Maiorana, Marco Esposito
BACKGROUND: Fixed prosthodontic treatment (crowns, fixed dental prostheses (FDPs), complete arch prostheses) involves the use of several different materials to replace missing tooth structure. Traditionally full metal or metal frameworks veneered with ceramic (metal-ceramic (MC)) have been used. In recent years several different metal-free systems have become available to clinicians and patients. In general, metal-free restorations should allow practitioners to better reproduce natural tooth colour, avoiding shortcomings of MC restorations...
December 20, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29243686/bone-augmentation-and-simultaneous-soft-tissue-thickening-with-collagen-tissue-matrix-derivate-membrane-in-an-aesthetic-area-a-case-report
#10
Algirdas Puišys, Saulius Žukauskas, Ričardas Kubilius, Eglė Vindašiūtė, Tomas Linkevičius
Aesthetic implant restoration in the anterior maxilla is a challenge for clinicians. Alveolar ridge and surrounding gingiva deficiencies aggravates implant placement in the aesthetic area. This case report describes a technique for aesthetic single implant placement with simultaneous bone grafting and soft tissue thickening. At the time of implant surgery, allogenic (Maxgraft, Botiss Biomaterials, Germany) and xenogenic bone substitute (Cerabone, Botiss Biomaterials, Germany) was used for bone grafting, soft tissues were augmented simultaneously with collagen tissue matrix derivate membrane (Mucoderm, Botiss Biomaterials, Germany)...
2017: Stomatologija
https://www.readbyqxmd.com/read/29243185/effect-of-fiber-post-length-and-abutment-height-on-fracture-resistance-of-endodontically-treated-premolars-prepared-for-zirconia-crowns
#11
Jie Lin, Jukka Pekka Matinlinna, Akikazu Shinya, Michael George Botelho, Zhiqiang Zheng
The purpose of this study was to compare the fracture resistance, mode of fracture, and stress distribution of endodontically treated teeth prepared with three different fiber post lengths and two different abutment heights, using both experimental and finite element (FE) approaches. Forty-eight human maxillary premolars with two roots were selected and endodontically treated. The teeth were randomly distributed into six equally sized groups (n = 8) with different combinations of post lengths (7.5, 11, and 15 mm) and abutment heights (3 and 5 mm)...
December 14, 2017: Odontology
https://www.readbyqxmd.com/read/29208782/relative-translucency-of-a-multilayered-ultratranslucent-zirconia-material
#12
Loubna Shamseddine, Zeina Majzoub
AIM: The aim of this study was to compare the translucency parameter (TP) of ultratranslucent multilayered (UTML) zirconia according to thickness and layer level. MATERIALS AND METHODS: Rectangles of UTML zirconia with four layers [dentin layer (DEL), first transitional layer (FTL), second transitional layer (STL), and enamel layer (ENL)] and four different thicknesses (0.4, 0.6, 0.8, and 1 mm) were milled from blanks. Digital images were taken in a dark studio against white and black backgrounds under simulated daylight illumination and international commission on illumination (CIE) Lab* color values recorded using Photoshop Creative Cloud software...
December 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/29204275/fractography-of-clinically-fractured-implant-supported-dental-computer-aided-design-and-computer-aided-manufacturing-crowns
#13
Ulrich Lohbauer, Renan Belli, Marco S Cune, Ulf Schepke
Today, a substantial part of the dental crown production uses computer-aided design and computer-aided manufacturing (CAD/CAM) technology. A recent step in restorative dentistry is the replacement of natural tooth structure with pre-polymerized and machined resin-based methacrylic polymers. Recently, a new CAD/CAM composite was launched for the crown indication in the load-bearing area, but the clinical reality forced the manufacturer to withdraw this specific indication. In parallel, a randomized clinical trial of CAD/CAM composite crowns luted on zirconia implant abutments revealed a high incidence of failure within the first year of service...
2017: SAGE open medical case reports
https://www.readbyqxmd.com/read/29194841/marginal-and-internal-fit-of-cad-cam-crowns-fabricated-over-reverse-tapered-preparations
#14
Jeison B Carbajal Mejía, Hirofumi Yatani, Kazumichi Wakabayashi, Takashi Nakamura
PURPOSE: Intraoral digital scanning can accurately record single abutment tooth preparations despite their geometry, and the algorithms of the CAD software can be set to manage different abutment forms. The purpose of this in vitro study was to evaluate the marginal and internal fit of CAD/CAM zirconia crowns fabricated over conventional and reverse-tapered preparations. MATERIALS AND METHODS: Crown preparations with known total occlusal convergence (TOC) angles (-8°, -4°, 0°, 8°, 12°, 16°, and 22°) were digitally created from a maxillary left central incisor and printed in acrylic resin...
November 30, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29186907/effect-of-clinically-relevant-cad-cam-zirconia-polishing-on-gingival-fibroblast-proliferation-and-focal-adhesions
#15
Nicholas G Fischer, Jeffrey Wong, Andrew Baruth, D Roselyn Cerutis
Mucosal seal formation around dental abutments is critical to the successful integration of dental implants into the human oral cavity. No information exists for how clinically relevant polishing procedures for computer-aided design and computer-aided manufactured (CAD/CAM) zirconia abutments affects cellular responses important to mucosal seal formation. CAD/CAM zirconia was divided into four groups for clinically relevant polishing utilizing commercial polishing heads: control, coarse, coarse plus medium, and coarse plus medium plus fine...
November 27, 2017: Materials
https://www.readbyqxmd.com/read/29181880/histological-evaluations-and-inflammatory-responses-of-different-dental-implant-abutment-materials-a-human-histology-pilot-study
#16
Teeratida Sampatanukul, Pravej Serichetaphongse, Atiphan Pimkhaokham
BACKGROUND: Improvements of soft tissue to the abutment surface results in more stable peri-implant conditions, however, few human histological studies have compared soft tissue responses around different abutment materials. PURPOSE: To describe the peri-implant tissue around 3 abutment materials; titanium, zirconia, and gold alloy, over an 8-week healing period. MATERIALS AND METHODS: Fifteen edentulous sites were treated with implants. Eight weeks later, peri-implant tissue was harvested and processed using a nonseparation resin embedded technique...
November 27, 2017: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/29179039/custom-morse-taper-zirconia-abutments-influence-on-marginal-fit-and-torque-loss-before-and-after-thermomechanical-cycling
#17
Izabela Cristina Maurício Moris, Adriana Cláudia Lapria Faria, Ricardo Faria Ribeiro, Alex Sui-Lun Fok, Renata Cristina Silveira Rodrigues
The use of zirconia abutments has increased because of aesthetics, but sometimes customization is necessary and its effect is unclear. This study evaluated the marginal fit and torque loss of customized and non-customized aesthetic zirconia abutments associated with Morse taper implants before and after thermomechanical cycling. Twenty-four implant/abutment/crown sets were divided into three groups (N = 8): Zr - non-customized zirconia abutments, Zrc - customized zirconia abutments, and Ti - titanium abutments...
November 21, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29178722/case-specific-finite-element-analysis-of-dental-cad-cam-prostheses-to-identify-design-flaws-prior-to-manufacture
#18
Davide Apicella, Tim Joda, Gianni Bonadeo, Roberto Sorrentino, Marco Ferrari
PURPOSE: To apply a design optimization strategy to dental prostheses machining to verify whether this approach can detect flaws occurring in the CAD process and to estimate the influence of the type of material on the occurrence of fractures in restorations. METHODS: The stereo lithography interface format of a 4-unit (from canine to first molar) fixed dental prosthesis designed by a conventional dental CAD process was converted into a Finite Element Analysis (FEA) model...
December 2016: American Journal of Dentistry
https://www.readbyqxmd.com/read/29167689/fatigue-fracture-strength-of-implant-supported-full-contour-zirconia-and-metal-ceramic-fixed-partial-dentures
#19
Fariborz Vafaee, Farnaz Firouz, Masoumeh Khoshhal, Amirarsalan Hooshyarfard, Armaghan Shahbazi, Ghodratollah Roshanaei
Objectives: Zirconia restorations have been suggested as a more durable and more appealing alternative to metal restorations. However, their mechanical properties may be negatively affected by fatigue due to superficial stresses or low temperature degradation. This study aimed to assess the fatigue fracture strength of three-unit implant-supported full contour zirconia and pre-sintered cobalt-chromium (Co-Cr) alloy posterior fixed partial dentures (FPDs). Materials and Methods: In this in-vitro experimental study, 28 posterior three-unit implant-supported FPDs were fabricated of full contour zirconia and pre-sintered Co-Cr alloy, and were cemented on implant abutments...
May 2017: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29153749/esthetic-abutment-design-for-angulated-screw-channels-a-technical-report
#20
Satoshi Sakamoto, Munehiko Ro, Aladdin Al Ardah, Charles Goodacre
Angulated screw channel system abutments (ASCs) have recently been introduced to address the problem with visible screw access that may compromise esthetics. ASCs allow the screw access to be modified up to 25 degrees relative to the implant axis. However, a widened channel, which may cause thinning of the facial ceramic, is needed at the implant screw head to allow for proper engagement of the screwdriver. This technical report introduces a custom titanium insert design, the Satoshi Sakamoto (SS) abutment...
November 15, 2017: Journal of Prosthetic Dentistry
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