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https://www.readbyqxmd.com/read/29042114/extending-the-service-life-of-existing-dental-restorations-with-esthetic-and-functional-limitations
#1
Malin Strasding, Vincent Fehmer, Bjarni E Pjetursson, Irena Sailer
Adhesive cementation is a useful procedure not only for cementing restorations onto teeth but also for attaching new ceramic restorations to existing restorations to improve their esthetics and/or function. This clinical report presents a technique for modifying an existing nonsatisfactory implant-supported fixed dental prosthesis by means of adhesively cemented veneers and onlays bonded to the pre-existing metal-ceramic surface with resin cement. This modification may avoid the replacement of the fixed dental prosthesis, reducing both treatment costs and time while fulfilling the patient's demands...
October 14, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29039965/scanning-electron-microscope-comparative-surface-evaluation-of-glazed-lithium-disilicate-ceramics-under-different-irradiation-settings-of-nd-yag-and-er-yag-lasers
#2
Josko Viskic, Drazen Jokic, Suzana Jakovljevic, Lana Bergman, Sladana Milardovic Ortolan, Senka Mestrovic, Ketij Mehulic
OBJECTIVE: To evaluate the surface of glazed lithium disilicate dental ceramics after irradiation under different irradiation settings of Nd:YAG and Er:YAG lasers using a scanning electron microscope (SEM). MATERIALS AND METHODS: Three glazed-press lithium disilicate ceramic discs were treated with HF, Er:YAG, and Nd:YAG, respectively. The laser-setting variables tested were laser mode, repetition rate (Hz), power (W), time of exposure (seconds), and laser energy (mJ)...
October 17, 2017: Angle Orthodontist
https://www.readbyqxmd.com/read/29035694/novel-zirconia-materials-in-dentistry
#3
Y Zhang, B R Lawn
Zirconias, the strongest of the dental ceramics, are increasingly being fabricated in monolithic form for a range of clinical applications. Y-TZP (yttria-stabilized tetragonal zirconia polycrystal) is the most widely used variant. However, current Y-TZP ceramics on the market lack the aesthetics of competitive glass-ceramics and are therefore somewhat restricted in the anterior region. This article reviews the progressive development of currently available and next-generation zirconias, representing a concerted drive toward greater translucency while preserving adequate strength and toughness...
October 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/29028851/peri-implant-crestal-bone-changes-around-zirconia-implants-in-periodontally-healthy-and-compromised-patients
#4
Kristian Kniha, Stefan Milz, Heinz Kniha, Nassim Ayoub, Frank Hölzle, Ali Modabber
PURPOSE: No consensus regarding the efficacy of zirconia implants in maintaining peri-implant hard and soft tissue health has yet been obtained. The aim of this retrospective follow-up study was to gain knowledge about peri-implant bone behavior and about implant survival and success after treatment with zirconia dental implants in patients with normal and compromised soft and hard tissue conditions. MATERIALS AND METHODS: This follow-up study involved 86 patients with 123 zirconia implants (Straumann PURE Ceramic Implant) that were radiographically investigated directly after implant placement (day 0), 3 months after placement, and 1 year after the definitive implant crown placement...
October 13, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29028848/the-stability-of-augmented-bone-between-two-different-membranes-used-for-guided-bone-regeneration-simultaneous-with-dental-implant-placement-in-the-esthetic-zone
#5
Sirida Arunjaroensuk, Soontra Panmekiate, Atiphan Pimkhaokham
PURPOSE: This randomized controlled clinical trial compared the stability of augmented bone between a synthetic resorbable membrane and a collagen resorbable membrane with guided bone regeneration (GBR) simultaneous with dental implant placement in the esthetic zone in terms of facial bone thickness. MATERIALS AND METHODS: A total of 60 dental implants from patients requiring implant placement with simultaneous GBR in the esthetic zone were equally allocated to the test group or control group by block randomization...
October 13, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29028598/a-particle-swarm-based-algorithm-for-optimization-of-multi-layered-and-graded-dental-ceramics
#6
Ehsan Askari, Paulo Flores, Filipe Silva
The thermal residual stresses (TRSs) generated owing to the cooling down from the processing temperature in layered ceramic systems can lead to crack formation as well as influence the bending stress distribution and the strength of the structure. The purpose of this study is to minimize the thermal residual and bending stresses in dental ceramics to enhance their strength as well as to prevent the structure failure. Analytical parametric models are developed to evaluate thermal residual stresses in zirconia-porcelain multi-layered and graded discs and to simulate the piston-on-ring test...
October 4, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29020664/shrinkage-vectors-of-a-flowable-composite-in-artificial-cavity-models-with-different-boundary-conditions-ceramic-and-teflon
#7
Dalia Kaisarly, Moataz El Gezawi, Xiaohui Xu, Peter Rösch, Karl-Heinz Kunzelmann
Polymerization shrinkage of dental resin composites leads to stress build-up at the tooth-restoration interface that predisposes the restoration to debonding. In contrast to the heterogeneity of enamel and dentin, this study investigated the effect of boundary conditions in artificial cavity models such as ceramic and Teflon. Ceramic serves as a homogenous substrate that provides optimal bonding conditions, which we presented in the form of etched and silanized ceramic in addition to an etched, silanized and bonded ceramic cavity...
October 3, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29017761/adm-guidance-ceramics-fatigue-principles-and-testing
#8
REVIEW
J R Kelly, P F Cesar, S S Scherrer, A Della Bona, R van Noort, M Tholey, A Vichi, U Lohbauer
BACKGROUND: Clinical failure of dental ceramics is usually reported as partial fracture of the restoration (chipping) or as catastrophic fracture of the whole structure. In contrast to metals, ceramics are linear-elastic, brittle materials exhibiting extremely low damage tolerance to failure. Well documented clinical and lab reports have shown this fracture event often occurs at loads far below their fracture strength due to intrinsic fatigue degradation via slow crack growth or cyclic fatigue mechanisms...
October 7, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28993220/silk-fibroin-hydroxyapatite-composites-for-bone-tissue-engineering
#9
REVIEW
Mehdi Farokhi, Fatemeh Mottaghitalab, Saeed Samani, Mohammad Ali Shokrgozar, Subhas C Kundu, Rui L Reis, Yousef Fattahi, David L Kaplan
Silk fibroin (SF) is a natural fibrous polymer with strong potential for many biomedical applications. SF has attracted interest in the field of bone tissue engineering due to its extraordinary characteristics in terms of elasticity, flexibility, biocompatibility and biodegradability. However, low osteogenic capacity has limited applications for SF in the orthopedic arena unless suitably functionalized. Hydroxyapatite (HAp) is a well-established bioceramic with biocompatibility and appropriate for constructing orthopedic and dental substitutes...
October 6, 2017: Biotechnology Advances
https://www.readbyqxmd.com/read/28985448/a-systematic-review-of-the-survival-and-complication-rates-of-all-ceramic-resin-bonded-fixed-dental-prostheses
#10
REVIEW
Junyu Chen, He Cai, Xiaochun Ren, Lai Suo, Xibo Pei, Qianbing Wan
PURPOSE: The aim of this systematic review was to investigate the survival and complication rates of all-ceramic resin-bonded fixed dental prostheses (RBFDPs). MATERIALS AND METHODS: The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were applied. A systematic search was conducted by an electronic search in PubMed, EMBASE, Cochrane Library, and CNKI databases complemented by a manual search. Only clinical studies on all-ceramic RBFDPs with a mean follow-up period of at least 3 years qualified for data analyses...
October 6, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28977778/novel-translucent-and-strong-submicron-alumina-ceramics-for-dental-restorations
#11
M Zhao, Y Sun, J Zhang, Y Zhang
An ideal ceramic restorative material should possess excellent aesthetic and mechanical properties. We hypothesize that the high translucency and strength of polycrystalline ceramics can be achieved through microstructural tailoring. The aim of this study is to demonstrate the superior optical and mechanical properties of a new class of submicron grain-sized alumina ceramics relative to the current state-of-the-art dental ceramic materials. The translucency, the in-line transmission ( TIT) in particular, of these submicron alumina ceramics has been examined with the Rayleigh-Gans-Debye light-scattering model...
October 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28969914/an-up-to-50-year-follow-up-of-crown-and-veneer-survival-in-a-dental-practice
#12
Ryan C Olley, Manoharan Andiappan, Peter Frost
STATEMENT OF PROBLEM: Indirect restorations are an important treatment in dental practice, but long-term survival studies are lacking. PURPOSE: The purpose of this retrospective study was to report on the outcome of indirect restorations, which were followed up annually for up to 50 years in a dental practice. MATERIAL AND METHODS: A retrospective survival study was undertaken at a mixed National Health Service (NHS)/private dental practice in London, UK...
September 29, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28969277/effect-of-different-composite-restorations-on-the-cuspal-deflection-of-premolars-restored-with-different-insertion-techniques-an-in-vitro-study
#13
Sakshi Singhal, Anuraag Gurtu, Anurag Singhal, Rashmi Bansal, Sumit Mohan
INTRODUCTION: This study was conducted to assess the effect of different composite materials on the cuspal deflection of premolars restored with bulk placement of resin composite in comparison to horizontal incremental placement and modified tangential incremental placement. AIM: The aim of this study was to evaluate the cuspal deflection caused by different composite materials when different insertion techniques were used. MATERIALS AND METHODS: Two different composite materials were used that is Tetric N Ceram (Ivoclar Vivadent marketing, India) and SonicFill(TM) (Kerr Sybron Dental)...
August 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28967395/simplified-cementation-of-lithium-disilicate-crowns-retention-with-various-adhesive-resin-cement-combinations
#14
Glen H Johnson, Xavier Lepe, Amanda Patterson, Oliver Schäfer
STATEMENT OF PROBLEM: A composite resin cement and matching self-etch adhesive was developed to simplify the dependable retention of lithium disilicate crowns. The efficacy of this new system is unknown. PURPOSE: The purpose of this in vitro study was to determine whether lithium disilicate crowns cemented with a new composite resin and adhesive system and 2 other popular systems provide clinically acceptable crown retention after long-term aging with monthly thermocycling...
September 27, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28965676/potentiodynamic-polarization-study-of-the-corrosion-behavior-of-palladium-silver-dental-alloys
#15
Desheng Sun, William A Brantley, Gerald S Frankel, Reza H Heshmati, William M Johnston
STATEMENT OF PROBLEM: Although palladium-silver alloys have been marketed for over 3 decades for metal-ceramic restorations, understanding of the corrosion behavior of current alloys is incomplete; this understanding is critical for evaluating biocompatibility and clinical performance. PURPOSE: The purpose of this in vitro study was to characterize the corrosion behavior of 3 representative Pd-Ag alloys in simulated body fluid and oral environments and to compare them with a high-noble Au-Pd alloy...
September 28, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28965115/clinical-outcomes-and-predictors-for-satisfaction-in-patients-with-improved-lithium-disilicate-all-ceramic-crowns
#16
Mazin Samer, Fawaz AlQahtani, Sami AlDubai, Hadijah Abdullah, Tara Taiyeb-Ali, Fahim Vohra, Roslan Saub
OBJECTIVES: The aim of this study was to determine the clinical outcomes and predictors of satisfaction in patients with lithium disilicate (LD) ceramic crowns. SUBJECTS AND METHODS: Clinical outcomes were assessed in 47 patients with 88 LD crowns using modified United States Public Health Service evaluation (USPHS) criteria and survival rates. The questionnaire for predictors included three aspects; a) socio-demographic characteristics; b) oral health habits (tooth brushing frequency, flossing frequency, and dental visits) and c) satisfaction of the restorations (aesthetics, function, fit, cleans ability and chewing ability of the crowns and overall satisfaction)...
October 1, 2017: Medical Principles and Practice: International Journal of the Kuwait University, Health Science Centre
https://www.readbyqxmd.com/read/28956844/the-influence-of-water-sorption-of-dental-light-cured-composites-on-shrinkage-stress
#17
Kinga Bociong, Agata Szczesio, Krzysztof Sokolowski, Monika Domarecka, Jerzy Sokolowski, Michal Krasowski, Monika Lukomska-Szymanska
The contraction stress generated during the photopolymerization of resin dental composites is the major disadvantage. The water sorption in the oral environment should counteract the contraction stress. The purpose was to evaluate the influence of the water sorption of composite materials on polymerization shrinkage stress generated at the restoration-tooth interface. The following materials were tested: Filtek Ultimate, Gradia Direct LoFlo, Heliomolar Flow, Tetric EvoCeram, Tetric EvoCeram Bulk Fill, Tetric EvoFlow, Tetric EvoFlow Bulk Fill, X-tra Base, Venus BulkFil, and Ceram...
September 28, 2017: Materials
https://www.readbyqxmd.com/read/28955597/treatment-approaches-for-traumatized-anterior-teeth-with-excessive-tissue-loss-three-case-reports
#18
Zuhal Yildirim, Omer Yavuz Gomec
Use of direct composite and indirect laminate veneers has been an alternative to metal- and all-ceramic crowns for anterior teeth restorations. Dental traumas are the most common reasons for excessive tissue loss. Treatment options depend on the amount of remaining tissue, the extent of the damage to dental pulp and periapical tissues and the time elapsed before dental treatment. The aim of this case report was to evaluate the direct and indirect techniques used in the treatments of traumatically fractured anterior teeth...
2017: J Istanb Univ Fac Dent
https://www.readbyqxmd.com/read/28951027/fatigue-resistance-of-nickel-titanium-instruments-exposed-to-high-concentration-hypochlorite
#19
Xiangya Huang, Ya Shen, Xi Wei, Markus Haapasalo
INTRODUCTION: The purpose of this study was to introduce a new fatigue test model that simulates the clinical situation for evaluating the corrosion effect of 5.25% sodium hypochlorite (NaOCl) on nickel-titanium (NiTi) files and to evaluate the effect of 3 different temperatures (22°C, 37°C, and 60°C) on the cyclic fatigue of these files. METHODS: Three NiTi files (size 25/.04), K3 (SybronEndo, Orange, CA), K3XF (SybronEndo), and Vortex (Dentsply Tulsa Dental Specialties, Tulsa, OK), were subjected to cyclic fatigue tests inside a novel artificial ceramic canal with a curvature of 60° and a 5-mm radius...
September 23, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28945669/comparative-analysis-of-cutting-efficiency-and-surface-maintenance-between-different-types-of-implant-drills-an-in-vitro-study
#20
Celso João Hochscheidt, Roberto Hideo Shimizu, Augusto Ricardo Andrighetto, Rodrigo Pierezan, Geninho Thomé, Rafael Salatti
INTRODUCTION: This study evaluated cutting efficiency (CE) and linear wear of dental implant drills after 450 standardized osteotomies on bovine ribs. Diamond-like carbon-coated steel drills (SG), acid-treated steel drills (EG), and ceramic drills (ZG) were divided into 6 subgroups according to the number of uses. MATERIALS AND METHODS: A robot-controlled program performed systematic instrumentation, timing, axial loading, and managed feed rate. CE was recorded in a polyurethane resin blank and end wear (VBBmax) was analyzed under stereo microscopy...
October 2017: Implant Dentistry
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