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A Atrey, S E Ward, A Khoshbin, N Hussain, E Bogoch, E H Schemitsch, J P Waddell
AIMS: We present the ten-year data of a cohort of patients, aged between 18 and 65 years (mean age 52.7 years; 19 to 64), who underwent total hip arthroplasty. Patients were randomised to be treated with a cobalt-chrome (CoCr) femoral head with an ultra-high molecular weight polyethylene (UHMWPE), highly cross-linked polyethylene (XLPE) or ceramic-on-ceramic (CoC) bearing surface. PATIENTS AND METHODS: A total of 102 hips (91 patients) were randomised into the three groups...
December 2017: Bone & Joint Journal
Marcos Daniel Septimio Lanza, Marcello Rubens Barsi Andreeta, Thiago Amadei Pegoraro, Luiz Fernando Pegoraro, Ricardo Marins De Carvalho
OBJECTIVE: Due to increasing of aesthetic demand, ceramic crowns are widely used in different situations. However, to obtain long-term prognosis of restorations, a good conversion of resin cement is necessary. To evaluate the degree of conversion (DC) of one light-cure and two dual-cure resin cements under a simulated clinical cementation of ceramic crowns. MATERIAL AND METHODS: Prepared teeth were randomly split according to the ceramic's material, resin cement and curing protocol...
November 2017: Journal of Applied Oral Science: Revista FOB
Carla Müller Ramos-Tonello, Bruno Freitas Trevizo, Raphaela Farias Rodrigues, Ana Paula Rodrigues Magalhães, Adilson Yoshio Furuse, Paulo Noronha Lisboa-Filho, Americo Sheitiro Tabata, Ana Flávia Sanches Borges
OBJECTIVES.: Sandblasting is a common method to try to improve the Y-TZP/veneer bond strength of dental prostheses, however, it may put stress on zirconia surfaces and could accelerate the t→m phase transformation. Y-TZP sandblasting before sintering could be an alternative to improve surface roughness and bonding strength of veneering ceramic. The aim of this study was to analyze the effect of Y-TZP pre-sintering sandblasting on surface roughness, phase transformation, and the Y-TZP/veneer shear bond strength...
November 2017: Journal of Applied Oral Science: Revista FOB
Begüm Kıran, Muhittin Toman, Nurcan Buduneli, David F Lappin, Suna Toksavul, Nejat Nizam
OBJECTIVES: Implant supported single metal-ceramic crowns cemented either extraorally or intraorally were comparatively evaluated by clinical, radiologic, biomarker, and microbiological parameters. MATERIALS AND METHODS: Twelve patients with bilateral single tooth gap in the maxillary posterior region received two locking-taper implants; 4.5 mm width, 8 mm length. Selection of intraoral (IOC) or extraoral cementation (EOC) using screwless titanium abutments was done randomly...
December 6, 2017: Clinical Implant Dentistry and related Research
Zhiping Zhang, Weikang Sun, Hongfei Liu, Guanhua Xie, Xiaobing Chen, Xianghua Zeng
Zr2WP2O12/ZrO2 composites were fabricated by solid state reaction with the goal of tailoring the thermal expansion coefficient. XRD, SEM and TMA were used to investigate the composition, microstructure, and thermal expansion behavior of Zr2WP2O12/ZrO2 composites with different mass ratio. Relative densities of all the resulting Zr2WP2O12/ZrO2 samples were also tested by Archimedes' methods. The obtained Zr2WP2O12/ZrO2 composites were comprised of orthorhombic Zr2WP2O12 and monoclinic ZrO2. As the increase of the Zr2WP2O12, the relative densities of Zr2WP2O12/ZrO2 ceramic composites increased gradually...
2017: Frontiers in Chemistry
Divya Iska, Raghu Devanna, Madhvi Singh, Rajkiran Chitumalla, Sai C Bala Balasubramanian, Manish Goutam
INTRODUCTION: Esthetics is one of the common issues because of which patients consult dental orthodontic treatment. Two ways of tooth bleaching are available these days, which includes in-office bleach and home bleach. Various bleaching protocols are available these days for treating the tooth surfaces. Hence, we planned the present study for investigating the impact of various intracoronal bleaching protocols on shear bond strength of ceramic brackets bonded to tooth surface after bleaching...
December 1, 2017: Journal of Contemporary Dental Practice
Dong-Lei Chen, Jing-Ming Xu, Zi-Qiang Wu, Qiao-Na Wang, Pei Wang, Chun-Bo Tang
PURPOSE: To observe the clinical effects of screw-retained implant-supported casted abutment integrated crowns (IACs) in the molar region with limited interocclusal space. METHODS: This study involved 507 implants in 376 patients with limited interocclusal space in the molar region. All implants were inserted to the jaw by standard one-stage protocol. Screw-retained IACs were used as the final prosthesis. With 6 to 24 months follow-up, the clinical effects of screw-retained IACs were recorded and analyzed using SPSS 17...
August 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
Abdul Rahman Alkharrat, Marc Schmitter, Stefan Rues, Peter Rammelsberg
OBJECTIVES: In vitro investigation of the effects of fixed dental prosthesis (FDP) support and loading conditions on the fracture behavior of all-ceramic, zirconia-based FDP veneered with computer-aided design/computer-aided manufacturing (CAD/CAM)-manufactured lithium disilicate ceramic. MATERIALS AND METHODS: Based on a model for a 3-unit FDP in the molar region (tooth in region 15, implant in region 17), 16 identical zirconia frameworks were fabricated and veneered with milled lithium disilicate ceramic...
December 2, 2017: Clinical Oral Investigations
Paul Sharplin, Michael C Wyatt, Alaistair Rothwell, Chris Frampton, Gary Hooper
INTRODUCTION: We have investigated the revision rates of all bearing surface combinations for primary total hip replacement (THR) registered on the New Zealand Joint Registry (NZJR) to determine which coupling has been the most durable and successful over the last 16 years. METHODS: There were 106,139 primary THRs registered, resulting in 4,960 revisions for any cause. We examined all-cause revision rates, reasons for revision and performed survival analyses. RESULTS: Ceramic-on-highly cross-linked polyethylene (CoPx) had the lowest all-cause revision rate of 0...
December 1, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
Moritz Zimmermann, Andre Valcanaia, Gisele Neiva, Albert Mehl, Dennis Fasbinder
OBJECTIVE: Several methods for the evaluation of fit of computer-aided design/computer-assisted manufacture (CAD/CAM)-fabricated restorations have been described. In the study, digital models were recorded with an intraoral scanning device and were measured using a new three-dimensional (3D) computer technique to evaluate restoration internal fit. The aim of the study was to evaluate the internal adaptation and fit of chairside CAD/CAM-fabricated zirconia-reinforced lithium silicate ceramic crowns fabricated with different post-milling protocols...
November 30, 2017: Quintessence International
Ayesha Aslam, Danish Azeem Khan, Syed Hammad Hassan, Bilal Ahmed
All dental restorations are liable to failure during function. Failure could be biologic, aesthetic, mechanical or a combination. Ceramic restorations in particular, including metal-ceramics, are prone to mechanical fracture, especially the fracture of veneering porcelain. Fracture of a metal-ceramic restoration jeopardizes function as well as aesthetics. It is equally onerous to manage for both patient and dentist. Optimal management of such cases requires a detailed knowledge of the aetiology behind this phenomenon...
May 2017: Dental Update
Renata Costa de Morais, Renata Espíndola Silveira, Michelle Chinelatti, Saulo Geraldeli, Fernanda de Carvalho Panzeri Pires-de-Souza
OBJECTIVE: The objective of this study was to evaluate the effect of a Biosilicate®, associated with dentin adhesive system, on microtensile bond strength (μTBS) to sound and demineralized dentin. MATERIALS AND METHODS: Eighty sound-extracted molars had their middle occlusal dentin exposed. In forty teeth, dentin was artificially demineralized (pH cycling). Sound and demineralized dentin teeth were separated into four groups (n = 10), according to the substrate treatment before restoration: Group 1-total-etching adhesive Adper TM Single bond 2 (ASB) + Biosilicate®, Group 2-ASB (without Biosilicate®), Group 3-AdheSE self-etching adhesive system (AdSE) + Biosilicate®, and Group 4-AdSE (without Biosilicate®)...
November 28, 2017: Clinical Oral Investigations
Raphael Pilo, Maria Dimitriadi, Anna Palaghia, George Eliades
OBJECTIVE: The aim of the study was to assess the roughness, structure and bond strength with zirconia of four grit-blasting treatments combined with three silane types, the reactivity of which was evaluated, as well. METHODS: The grit-blasted treatments performed on zirconia (Lava) were alumina (ALU), CoJet (COJ), SilJet (SLJ) and SilJet Plus (SJP, with silica-encapsulated silane). The other two silanes selected were the S-Bond (SB, prehydrolyzed) and Clearfil Ceramic Primer Plus (CP, prehydrolyzed with 10-MDP)...
November 25, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
Uwe Scheithauer, Steven Weingarten, Robert Johne, Eric Schwarzer, Johannes Abel, Hans-Jürgen Richter, Tassilo Moritz, Alexander Michaelis
In our study, we investigated the additive manufacturing (AM) of ceramic-based functionally graded materials (FGM) by the direct AM technology thermoplastic 3D printing (T3DP). Zirconia components with varying microstructures were additively manufactured by using thermoplastic suspensions with different contents of pore-forming agents (PFA), which were co-sintered defect-free. Different materials were investigated concerning their suitability as PFA for the T3DP process. Diverse zirconia-based suspensions were prepared and used for the AM of single- and multi-material test components...
November 28, 2017: Materials
N Abdulhameed, J-F Roulet, C Chen, H Hussein
AIMS: To evaluate in vitro the influence of firing on marginal and internal fit of all-ceramic milled and pressed lithium-disilicate crowns. MATERIALS AND METHODS: One Standardized model with 1.6mm occlusal and 1.4mm axial reduction was used to fabricate 64 crowns. Using a factorial design, eight groups of lithium disilicate ceramics (n=8) using P=press, C=CAD/CAM, M=monolithic, O=coping, V=veneered, R=as produced: PMR, PMG, POR, PVG, CMR, CMG, COR, CVG. Crowns were produced and cemented on stone dies, then embedded in clear epoxy resin and sectioned into two plains...
November 21, 2017: Community Dental Health
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
Gizem Ön Salman, Ɣbrahim Halil Tacír, Zelal Seyfioğlu Polat, Afşin Salman
PURPOSE: To evaluate fracture strength of different preparation designed onlay and overlay restorations produced by Computer Aided Design/Computer Aided Manufacturing (CAD/CAM) and three different new ceramic-polymer blocks. METHODS: Ninety-one extracted human mandibular molars were used in this study. Preparations were made as (1) Only functional cusps reduction, (2) Only functional cusps reduction+rounded shoulder finish line, (3) All cusps reduction, or (4) All cusps reduction+rounded shoulder finish line...
June 2017: American Journal of Dentistry
Gamze Karacolak, L Sebnem Turkun, Hayal Boyacioglu, Jack L Ferracane
Determining the energy transferred at the bottom of eleven bulk-fill resin composites, comparing top and bottom microhardness's and evaluating the correlation between microhardness and radiant energy were aimed. Samples were placed over the bottom sensor of a visible light transmission spectrophotometer and polymerized for 20 s. The bottom and top Knoop microhardness were measured. Paired t-test and correlation analysis were used for statistics (p≤0.05). In all groups, the bottom radiant energy decreased significantly with increasing thickness...
November 23, 2017: Dental Materials Journal
Ting Khee Ho, Julian D Satterthwaite, Nikolaos Silikas
OBJECTIVE: To assess the change in surface roughness of nanohybrid resin composite (Tetric EvoCeram) after antagonist wear against monolithic zirconia and lithium disilicate ceramics through a simulated chewing test using a three-dimensional (3D) profilometer. METHODS: A total of 40 Tetric EvoCeram™ resin composite specimens against either a Lava™ Plus zirconia antagonist (n=20) or IPS e.max Press lithium disilicate antagonist (n=20) were prepared for the study...
November 23, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
Rupal Shah, Dominic P Laverty
For several years, all-ceramic resin-bonded bridges (RBBs) have been considered an aesthetic treatment option for the replacement of missing teeth in the anterior region. With continued developments in technology, various different ceramic materials have been used to fabricate all-ceramic RBBs including zirconia, glass-reinforced, alumina-based ceramics, and lithium disilicate glass ceramics. The aim of this article is to provide an overview of all-ceramic RBBs, the advantages and disadvantages associated with these prostheses, as well as to demonstrate their application in replacing missing anterior teeth...
March 2017: Dental Update
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