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Dental And Zirconia

Stefano Pieralli, Ralf-Joachim Kohal, Kerstin Rabel, Manja von Stein-Lausnitz, Kirstin Vach, Benedikt Christopher Spies
OBJECTIVE: To assess the survival and technical complication rate of partial and full-arch all-ceramic implant-supported fixed dental prostheses (P-FDP/FA-FDP) and supporting implants. MATERIALS AND METHODS: An electronic search through three databases (MEDLINE/Pubmed, Cochrane Library, Embase) was conducted to identify relevant clinical studies with an observation period of at least 12 months, including ≥15 patients. Reconstruction and implant survival rates, technical complications and confounding variables such as processed/installed materials, retention mode and location in the mouth were obtained...
October 2018: Clinical Oral Implants Research
Maurice A Salama, Alessandro Pozzi, Wendy Auclair Clark, Marko Tadros, Lars Hansson, Pinhas Adar
Inadequate restorative space can result in mechanical, biologic, and esthetic complications with full-arch fixed implant-supported prosthetics. As such, clinicians often reduce bone to create clearance. The aim of this paper was to present a protocol using stacking computer-aided design/computer-assisted manufacturing (CAD/CAM) guides to minimize and accurately obtain the desired bone reduction, immediately place prosthetically guided implants, and load a provisional that replicates predetermined tissue contour...
November 2018: International Journal of Periodontics & Restorative Dentistry
Islam Abd Alraheam, Caroline Nguyen Ngoc, Christopher A Wiesen, Terence E Donovan
OBJECTIVES: To assess and compare the 5-year success rate of resin-bonded fixed partial dentures (RBFPDs) fabricated from different materials. METHODS: An electronic search on 3 databases from January 1965 to March of 2017 was done for human randomized clinical trials (RCTs), and prospective and retrospective cohort studies. The key words used in the search were: Bridge OR bridges OR fixed partial OR fixed dental AND resin bonded OR Maryland OR ceramic bonded. Quality assessment was done using the Newcastle-Ottawa scale...
October 10, 2018: Journal of Esthetic and Restorative Dentistry
Guido Sterzenbach, Martin Rosentritt, Hendrik Meyer-Lueckel, Kerstin Bitter, Michael Naumann
The influence of a fiber post-restored abutment tooth on the load capability of a three-unit zirconia framework cantilever fixed dental prosthesis (cFDP) was evaluated after simulated clinical function. Human lower sound premolars (n = 64) were distributed, in equal numbers, to four experimental groups: two vital abutment teeth (group I; control); mesial abutment tooth post-restored (group II); distal abutment tooth post-restored (group III); and mesial and distal abutment teeth post-restored (group IV). All specimens received an adhesively luted three-unit cFDP of veneered zirconia...
October 1, 2018: European Journal of Oral Sciences
Luciano Praça, Fabrice Chuembou Pekam, Rodrigo Otavio Rego, Klaus Radermacher, Stefan Wolfart, Juliana Marotti
OBJECTIVE: This in vitro study aimed to evaluate marginal and internal fit of single crowns produced from high-frequency ultrasound based digital impressions of teeth prepared with finish lines covered by porcine gingiva, in comparison with those obtained by optical scanners with uncovered finish lines. METHODS: Ten human teeth were prepared and forty zirconia crowns were fabricated from STL-datasets obtained from four dental scanners (n=10): extraoral CS2 (Straumann), intraoral Lava COS (3M), intraoral Trios (3Shape) and extraoral ultrasound scanner...
September 26, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Célio G Figueiredo-Pina, Mafalda Guedes, Joana Sequeira, Diana Pinto, Nuno Bernardo, Carla Carneiro
This study aims to understand microorganisms' effect and relevance of aseptic conditions on wear performance of dental materials. Tribocouple zirconia/titanium was submitted to tribological tests in the presence of Streptococcus salivarius biofilm, the most abundant bacteria in the oral cavity. Reciprocating ball-on-plate tests were carried out at 37°C, pH 7, 2 N, and 1 Hz, during 2 h, using Ti6Al4V balls as pins and Y-TZP plates. Simultaneous OCP readings assessed corrosion tendency. Tested lubricants were artificial saliva, artificial saliva plus glucose, and artificial saliva plus glucose and S...
September 29, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
Angel E Rodriguez, Mona Monzavi, Chester L Yokoyama, Hessam Nowzari
OBJECTIVE: Limited clinical evidence has been reported in dental literature regarding zirconia dental implants. The aim of the present retrospective consecutive case series was to evaluate the clinical outcome of zirconia dental implants with 1 to 5 years of follow-up. CLINICAL CONSIDERATIONS: The clinical outcome of 24 implants in 12 consecutive patients (male 5, female 7) with a mean age of 55 years (range 27-86) is reported. Radiographic crestal bone level was assessed by the use of "ImageJ" software program...
September 25, 2018: Journal of Esthetic and Restorative Dentistry
Gentaro Mori, Takafumi Kobayashi, Taichi Ito, Yasutomo Yajima
Sjögren's syndrome (SS), an autoimmune disorder, affects the exocrine glands, including the lacrimal and salivary glands. It is characterized by symptoms of dry eye and dry mouth. As secretion of saliva decreases, patients with SS experience rampant caries, pain in the oral mucosa, inflammation and hardening of the salivary glands, abnormal taste, dysphagia, and loss of teeth earlier than healthy individuals. A removable partial denture is often used as a prosthesis after tooth loss. Compromised salivary lubrication, however, can produce traumatic ulceration of the mucosa, making use of a removable prosthesis in SS patients painful...
2018: Bulletin of Tokyo Dental College
Kosuke Nakazawa, Keisuke Nakamura, Akio Harada, Midori Shirato, Ryoichi Inagaki, Ulf Örtengren, Taro Kanno, Yoshimi Niwano, Hiroshi Egusa
Zirconia (3Y-TZP) dental prostheses are widely used in clinical dentistry. However, the effect of ultrasonic scaling performed as a part of professional tooth cleaning on 3Y-TZP dental prostheses, especially in conjunction with low-temperature degradation (LTD), has not been fully investigated. The present study aimed to evaluate the influence of ultrasonic scaling and LTD on the surface properties of 3Y-TZP in relation to bacterial adhesion on the treated surface. 3Y-TZP specimens (4 × 4 × 2 mm) were polished and then subjected to autoclaving at 134°C for 100 h to induce LTD, followed by 10 rounds of ultrasonic scaling using a steel scaler tip for 1 min each...
2018: PloS One
Ulku Tugba Kalyoncuoglu, Bengi Yilmaz, Serap Gungor Koc, Zafer Evis, Pembegul Uyar Arpaci, Gulay Kansu
BACKGROUND: For long-term success of dental implants, it is essential to maintain the health of the surrounding soft tissue barrier, which protects the bone-implant interface from the microorganisms. Although implants based on titanium and its alloys still dominate the dental implant market, alumina (Al2 O3 ) and zirconia (ZrO2 ) implant systems are widely used in the area. However, they provide smooth and bioinert surfaces in the transmucosal region, which poorly integrate with the surrounding tissues...
September 12, 2018: Clinical Implant Dentistry and related Research
F Santos, A Branco, M Polido, A P Serro, C G Figueiredo-Pina
Ceramic based prosthetic materials have been used in dental restorations due to their excellent aesthetic and biocompatibility. However, due to concerns related to their mechanical properties and abrasive action against natural teeth, a proper selection of these materials is crucial to preserve the occlusal interactions and prevent abnormal dental wear. The aim of this work is to compare the wear performance of Vita Enamic®, a polymer infiltrated ceramic (PIC), with that of other three commercial ceramic based dental materials - Zirconia, Leucite and Zirconia Veneered - when tested against natural teeth...
August 20, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Se-Mok Oh, Jin-Wook Kim, So-Young Choi, Du-Hyeong Lee
The fibular free flap (FFF) approach is the preferred option for reconstruction of segmental mandibular deficiencies. Fixed dental prostheses are recommended for patients who have undergone FFF jaw surgery to improve quality of life, but treatment of these patients with an implant-supported prosthesis is challenging because of the thin bone and thick soft tissue in the fibula. This case history reports the use of a bone-level implant guide fabricated with a computer-aided system and milled customized long abutments for implant placement and prosthodontic procedures...
September 6, 2018: International Journal of Prosthodontics
Ahila Singaravel Chidambara Nathan, Rajdeep Tah, Muthu Kumar Balasubramanium
Background: Dental ceramics exhibit great optical properties and better esthetics due to their translucency. Concern with this material is its brittleness, which accounts for its failure. Feldspathic ceramic is the most widely used veneering ceramic. Aim and objectives: To evaluate and compare the fracture toughness of pressable feldspathic ceramics reinforced with zirconia silica nano-fibres with conventional pressable feldspathic ceramics. Materials and method: According to ISO 6872, a master die was prepared from which, Bar shaped samples were formed in acrylic resin with the specified dimensions of 4...
September 2018: Journal of Oral Biology and Craniofacial Research
Benedikt C Spies, Matthias Petsch, Ralf-Joachim Kohal, Florian Beuer
Several attachment systems for implant-supported removable dental prostheses (ISRDPs) are currently available. The bar attachment option includes cast or milled alloyed male and female parts. Replaceable slide attachments made from elastic materials can be inserted into the female part of the bar to counter loss of friction that develops due to wear. Another approach involves milling the female part from organic thermoplastic polymers. In the present case history report, an edentulous maxilla was restored with a digitally fabricated ISRDP with the female part of the bar milled from polyether ether ketone (PEEK) polymerized into a zirconia framework...
September 2018: International Journal of Prosthodontics
Yu Zhang, Brian R Lawn
OBJECTIVES: To survey simple contact testing protocols for evaluating the mechanical integrity of zirconia dental ceramics. Specifically, to map vital material property variations and to quantify competing damage modes. METHODS: Exploratory contact tests are conducted on layer structures representative of zirconia crowns on dentin. RESULTS: Sharp-tip micro- and nano-indentations were used to investigate the roles of weak interfaces and residual stresses in veneered zirconia, and to map property variations in graded structures...
August 29, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Takashi Nakamura, Shinya Okamura, Hisataka Nishida, Hirofumi Usami, Yoshiro Nakano, Kazumichi Wakabayashi, Tohru Sekino, Hirofumi Yatani
The fluorescence and physical properties of thulium-doped zirconia were investigated. A standard grade of zirconia (TZ-3Y-E) and two translucent dental zirconia materials (Zpex and Zpex Smile) were examined. The specimens were prepared by addition of 0-1.5 wt% Tm2 O3 and then sintering. When exposed to UV light, the Tm2 O3 -doped zirconia exhibited blue fluorescence with a peak wavelength of 460 nm. The fluorescence intensity of Zpex and Zpex Smile was higher than that of TZ-3Y-E, with Zpex being more intense than Zpex Smile...
August 29, 2018: Dental Materials Journal
Majed Alsarani, Grace De Souza, Amin Rizkalla, Omar El-Mowafy
BACKGROUND: All-ceramic restorations have become popular and the trend is ongoing. However, the incidence of chipping within the veneering layer has been a commonly reported failure in clinical practice. OBJECTIVES: The aim of this in vitro study was to evaluate the effect of ceramic crown design (monolithic vs bi-layered) and material on the chipping resistance of molar crowns submitted to compressive cyclic loading. MATERIAL AND METHODS: Fifty identical epoxy resin replicas of a mandibular first molar with crown preparation were divided into 5 groups (n = 10) as follows: the MLD group - monolithic CAD/CAM lithium-disilicate glass-ceramic (LDGC) crowns; 30 zirconia cores were veneered with either feldspathic porcelain by hand-layering technique (ZHL) or by heat-pressing technique (ZVP), or with milled LDGC veneers and subsequently fused to the cores (ZLD); 10 porcelain-fused-to-metal (PFM) crowns acted as a control group...
January 2018: Dental and medical problems
Eun-Jeong Bae, Il-Do Jeong, Woong-Chul Kim, Ji-Hwan Kim
PURPOSE: The purpose of this study was to compare the cutting method and the lamination method to investigate whether the CAD data of the proposed inlay shape are machined correctly. MATERIALS AND METHODS: The Mesial-Occlusal shape of the inlay was modeled by changing the stereolithography (STL). Each group used SLS (metal powder) or SLA (photocurable resin) in the additive method, and wax or zirconia in the subtractive method (n=10 per group, total n=40). Three-dimensional (3D) analysis program (Geomagic Control X inspection software; 3D systems) was used for the alignment and analysis...
August 2018: Journal of Advanced Prosthodontics
Işıl Sarıkaya, Yeliz Hayran
BACKGROUND: The purpose of this study is to evaluate the wear and fracture strength of crowns and three-unit partial fixed dental prosthesis (FDP) fabricated using by Bruxzir and Incoris TZI as recently introduced monolithic zirconia materials. METHODS: A total of sixteen crowns and sixteen three-unit FDPs were fabricated using Bruxzir and Incoris TZI (n = 8). All specimens were subjected to a 2-body wear test in a dual axis chewing simulator for 1,200,000 loading cycles against steatite antagonist balls...
August 23, 2018: BMC Oral Health
Maxime Rousseau, Jean-Marc Retrouvey
Osteogenesis imperfecta (OI) is a genetic disorder that is usually caused by disturbed production of collagen type I. Depending on its severity in the patient, this disorder may create difficulties and challenges for the dental practitioner. The goal of this article is to provide guidelines based on scientific evidence found in the current literature for practitioners who are or will be involved in the care of these patients. A prudent approach is recommended, as individuals affected by OI present with specific dentoalveolar problems that may prove very difficult to address...
2018: PeerJ
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