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https://www.readbyqxmd.com/read/28645670/fracture-resistance-of-cad-cam-monolithic-ceramic-and-veneered-zirconia-molar-crowns-after-aging-in-a-mastication-simulator
#1
Merve Bankoğlu Güngör, Secil Karakoca Nemli
STATEMENT OF PROBLEM: The demand for ceramic restorations has increased over the past years, and now various machinable materials can be used for chairside computer-aided design and computer aided manufacturing (CAD-CAM) systems. Limited studies of these new materials make it difficult to evaluate their mechanical performance, advantages, and limitations. PURPOSE: The purpose of this in vitro study was to investigate the fracture resistance of CAD-CAM monolithic ceramic and veneered zirconia molar crowns after thermomechanical aging...
June 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28642927/the-effect-of-grinding-and-or-airborne-particle-abrasion-on-the-bond-strength-between-zirconia-and-veneering-porcelain-a-systematic-review
#2
REVIEW
Karin Lundberg, Lindsey Wu, Evaggelia Papia
Objective: The aim of the study was to make an inventory of current literature on the bond strength between zirconia and veneering porcelain after surface treatment of zirconia by grinding with diamond bur and/or with airborne-particle abrasion. Material and methods: The literature search for the present review was made following recommended guidelines using acknowledged methodology on how to do a systematic review. The electronic databases PubMed, Cochrane Library, and Science Direct were used in the present study...
January 2017: Acta Biomaterialia Odontologica Scandinavica
https://www.readbyqxmd.com/read/28642551/aesthetic-preformed-crowns-for-primary-teeth
#3
Greig D Taylor
Data sourcesMedline, Cochrane central register of controlled trials, US National Institutes of Health Trials Register and the World Health Organization International Clinical Trials Registry Platform.Study selectionEnglish language randomised clinical trials comparing APCs with conventional restorative techniques for primary teeth.Data extraction and synthesisStudy selection and data abstraction were conducted independently by two reviewers. Risk of bias was assessed using the Cochrane risk of bias tool. Study characteristics and results were described qualitatively...
June 23, 2017: Evidence-based Dentistry
https://www.readbyqxmd.com/read/28637992/ten-year-clinical-observation-of-a-porcelain-laminate-veneer-seated-with-biological-tissue-adaptation-bta-technique
#4
Kenji Tsubota
This clinical report describes the use of biological tissue adaptation technique for placement of a porcelain laminate veneer in a 50-year-old woman. The author developed this prosthetic technique to facilitate alignment of gingival levels for esthetic purposes. The laminate veneer was seated on the maxillary central incisor with an adhesive system. Although the margin of the restoration overhangs, no gingival inflammation or recession has been observed during a follow-up period of 10 years and 9 months.
2017: Journal of Oral Science
https://www.readbyqxmd.com/read/28633093/fracture-resistance-of-ceramic-and-polymer-based-occlusal-veneer-restorations
#5
Majed Al-Akhali, Mohamed Sad Chaar, Adham Elsayed, Abdulaziz Samran, Matthias Kern
OBJECTIVES: The purpose of this in vitro study was to evaluate the influence of thermodynamic loading on the durability and fracture resistance behavior of occlusal veneers fabricated from different biomedical dental CAD/CAM materials. METHODS: The occlusal surfaces of 64 extracted premolars were prepared in the enamel layer and restored with occlusal veneers with a fissure/cusp thickness of 0.5/0.8mm made from four different dental CAD/CAM materials: group LD lithium disilicate (e...
June 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28629657/single-unit-implant-supported-restoration-adjacent-to-multiple-lithium-disilicate-restorations-an-approach-to-an-esthetic-challenge-a-clinical-report
#6
Gelareh Ronaghi, Winston Chee, Stephanie Yeung
This clinical report describes a method for predictably shade matching a highly opaque yttrium-stabilized tetragonal zirconia polycrystal (Y-TZP) implant restoration adjacent to relatively translucent lithium disilicate veneers in the maxillary anterior region. To achieve a satisfactory outcome, the milled Y-TZP abutment was layered with low-fusing feldspathic porcelain to match the stump shade of the adjacent prepared teeth; this layer subsequently facilitated adhesive bonding of a veneer to the abutment before insertion...
June 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28621271/effect-of-sandblasting-angle-and-distance-on-biaxial-flexural-strength-of-zirconia-based-ceramics
#7
Somayeh Zeighami, Ali Gheidari, Hoseinali Mahgoli, Ahmad Rohanian, Safoura Ghodsi
AIM: Surface treatment is necessarily required for bonding of zirconia to the veneering porcelain and luting cements. Sandblasting is the most common and probably the most efficient surface treatment method. Sandblasting roughens the surface and may affect the flexural strength of zirconia. Different sandblasting protocols may yield variable results. This study sought to assess the effect of sandblasting angle and distance on the biaxial flexural strength of zirconia-based ceramics. MATERIALS AND METHODS: This in vitro experimental study was conducted on 50 zirconia discs measuring 1...
June 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28619358/integrating-a-facial-scan-virtual-smile-design-and-3d-virtual-patient-for-treatment-with-cad-cam-ceramic-veneers-a-clinical-report
#8
Wei-Shao Lin, Bryan T Harris, Kamolphob Phasuk, Daniel R Llop, Dean Morton
This clinical report describes a digital workflow using the virtual smile design approach augmented with a static 3-dimensional (3D) virtual patient with photorealistic appearance to restore maxillary central incisors by using computer-aided design and computer-aided manufacturing (CAD-CAM) monolithic lithium disilicate ceramic veneers.
June 13, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28609504/combining-esthetic-layering-and-lithium-disilicate-sintering-technique-on-zirconia-frameworks-a-veneering-option-to-prevent-ceramic-chipping
#9
Reza Saeidi Pour, Daniel Edelhoff, Caroline Freitas Rafael, Otto Prandtner, Stefan Frei, Claudia Angela Maziero Volpato, Anja Liebermann
Major and minor chipping of veneering porcelain are two of the most frequent complications in all-ceramic restorations with zirconia frameworks. In cases of major chipping, replacement of the affected restoration may be necessary. High-strength lithium disilicate ceramic offers new options to serve as veneering material in a sintering technique or as repair material for chipping in combination with the adhesive technique. The purpose of three case presentations here was to describe the use of lithium disilicate ceramic on zirconia frameworks for reliable and esthetic veneering in the posterior region and to repair extended chipping in conventional veneering materials...
July 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/28609496/effect-of-ceramic-barriers-of-different-thicknesses-on-microhardness-of-light-cured-resin-cements
#10
Yasmin Alves do Nascimento, Ayla Macyelle de Oliveira Correia, Darlon Martins Lima, Sandro Griza, Wilton Mitsunari Takeshita, Adriano Augusto Melo de Mendonça
This study evaluated the microhardness of two resin cements and a low-viscosity resin composite when light-cured under different ceramic thicknesses. A total of 20 samples (10.0 × 1.0 mm) of each material were polymerized by means of a LED light source with an intensity of 1,100 mW/cm(2) for 20 seconds. For each experimental group, different ceramic thicknesses (0.5 mm, 1.0 mm, and 1.5 mm) were applied to each sample. For the control group, the samples were polymerized without the presence of ceramics. Each material was then stored in dry vials that inhibited the passage of light for a period of 24 hours...
July 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/28608051/clinical-evaluation-of-zirconia-based-all-ceramic-single-crowns-an-up-to-12-year-retrospective-cohort-study
#11
Shoko Miura, Shin Kasahara, Shinobu Yamauchi, Yayoi Okuyama, Akio Izumida, Jun Aida, Hiroshi Egusa
OBJECTIVES: This study aims to investigate the incidence of clinical complications with tooth-supported zirconia-based all-ceramic single crowns and identify pertinent risk parameters. MATERIALS AND METHODS: A retrospective cohort study (May 2004 to April 2016) utilizing clinical records of patients receiving yttrium-oxide-partially stabilized zirconia (Y-TZP)-based all-ceramic crowns placed at Tohoku University Hospital was performed. The length of time of treatment success (complication event-free) and restoration survival (including minor complication events and remaining clinically functional) were estimated using Kaplan-Meier analysis...
June 12, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28597965/fracture-resistance-of-zirconia-based-all-ceramic-crowns-after-bur-adjustment
#12
Stefan Rues, Franz S Schwindling, Andre Meyer, Peter Rammelsberg, Marc Schmitter
Intra-oral grinding is often required to optimize occlusion of all-ceramic restorations. The effect of burs of different grit size on the fracture resistance of veneered zirconia crowns was investigated in this study. Forty-eight standardized zirconia copings were produced. The ceramic veneer was designed with a positive ellipsoidal defect on the palatal aspect of the crowns. To simulate adjustment of dental restorations by burs, this palatal defect was removed by use of three different diamond-coated burs with grit sizes 46, 107, or 151 μm (fine, medium, or coarse, respectively)...
June 9, 2017: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/28595102/a-comparative-study-of-progressive-wear-of-four-dental-monolithic-veneered-glass-ceramics
#13
Zhenzhen Zhang, Yuanping Yi, Xuesong Wang, Jiawen Guo, Ding Li, Lin He, Shaofeng Zhang
OBJECTIVES: This study evaluated the wear performance and wear mechanisms of four dental glass-ceramics, based on the microstructure and mechanical properties in the progressive wear process. METHODS: Bar (N = 40, n = 10) and disk (N = 32, n = 8) specimens were prepared from (A) lithium disilicate glass-ceramic (LD), (B) leucite reinforced glass-ceramic (LEU), (C) feldspathic glass-ceramic (FEL), and (D) fluorapatite glass-ceramic (FLU). The bar specimens were tested for three-point flexural strength, hardness, fracture toughness and elastic modulus...
May 30, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28590838/comparative-evaluation-of-effects-of-laser-modalities-on-shear-bond-strengths-of-veneering-porcelains-to-laser-sintered-substructures-an-in-vitro-study
#14
Oguzhan Gorler, Aysegul Goze Saygin
OBJECTIVE: Laser modalities and direct metal laser sintering (DMLS) have a potential to enhance micromechanical bonding between dental super- and infrastructures. However, the effect of different manufacturing methods on the metal-ceramic bond strength needs further evaluation. We investigated the effect of surface treatment with Er:YAG, Nd:YAG, and Ho:YAG lasers on the shear bond strength (SBS) of high-fusion dental porcelains (Vita and G-Ceram) to infrastructures prepared with DMLS in vitro settings...
June 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28590094/optical-properties-and-failure-load-of-thin-cad-cam-ceramic-veneers
#15
Henriika Maunula, Jenni Hjerppe, Lippo L V Lassila, Timo O Närhi
This study aimed to compare optical properties and failure load of leucite (IPS Empress CAD LT) and lithium disilicate glass ceramic (IPS e.max CAD LT) materials in incisor veneers. Four groups of veneers were made on 36 bovine incisors with Cerec 3D milling unit (n=9/group): 0.5 and 0.3 mm thick leucite glass and 0.5 and 0.3 mm lithium disilicate glass veneers. The optical features were measured with CM-700d spectrophotometer using white and yellow try-in pastes. Differences were determined by means of ΔE value and luminance...
June 2017: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/28586234/the-direct-indirect-technique-for-composite-restorations-revisited
#16
André V Ritter, Newton Fahl, Marcos Vargas, Rodrigo R Maia
In the direct-indirect composite technique, composite is applied to a nonretentive tooth preparation (eg, a noncarious cervical lesion or a veneer/inlay/onlay preparation) without any bonding agent, sculpted to a primary anatomic form, and light-cured. The partially polymerized restoration is then removed from the preparation and finished and tempered extraorally chairside. The finished inlay is bonded to the preparation using a resin-based luting agent. Advantages of this technique include enhanced physical and mechanical properties afforded by the extraoral chairside tempering process because of increased monomer conversion, and greater operator control over the final marginal adaptation, surface finishing and polishing, and anatomy of the restoration, given that these elements are defined outside of the patient's mouth...
June 2017: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/28580462/does-tack-curing-luting-cements-affect-the-final-cure
#17
Daniel Stegall, Daranee Tantbirojn, Jorge Perdigão, Antheunis Versluis
PURPOSE: Short initial light curing or "tack curing" is used to create a semi-gel state in luting cements for easier excess material cleanup. The effect of tack curing on the final cure of luting cements was measured in terms of hardness. MATERIALS AND METHODS: Three cement types were tested: two dual-curing composite cements (RelyX Unicem 2; Maxcem Elite); three light-curing veneer cements (Choice 2; Variolink Esthetic LC; RelyX Veneer); and two self-curing resin-modified glass-ionomer (RMGI) luting cements (RelyX Luting Plus; Nexus RMGI)...
June 2, 2017: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/28571295/dental-avengers-taking-retainer-stability-and-aesthetics-into-next-era
#18
Sayam Patil, Sanjeev Jakati
Adult patients are realizing that practical, realistic options now exist to "straighten" their teeth because the cosmetic dentistry revolution has begun to include even "adult short-term cosmetic orthodontics" as an integral part. Previously, the patients were bound to select between either the aesthetic benefits of ceramic or the bondability characteristic of composite, however this can now be fabricated in such a manner that still allows placement of a lingual splint so as to steady the orthodontic movement...
April 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28571263/the-effect-of-accelerated-aging-on-the-colour-stability-of-composite-resin-luting-cements-using-different-bonding-techniques
#19
Satheesh B Haralur, Mohammed Alfaifi, Abdulmajeed Almuaddi, Mazen Al-Yazeedi, Abdulmajeed Al-Ahmari
INTRODUCTION: The main criterion of successful aesthetic restoration is to match the colour of the adjacent teeth. Porcelain laminate veneer is widely practiced indirect restoration in the contemporary aesthetic dentistry. The underlying luting cement colour influences the final outcome of the thin, translucent veneer shade. Hence, colour stability of luting cement is important criteria during their selection. AIM: The objective of the study was to assess the colour stability of the different dentin bonding techniques in composite resin luting cements...
April 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28569446/the-effect-of-lithium-disilicate-opacity-on-polymerization-of-a-dual-cured-resin-cement
#20
Dylton da Costa Neto, Jefferson Pereira, Saulo Pamato, Accácio do Valle
The aim of this study was to evaluate the influence of different levels of opacity of the lithium disilicate framework upon polymerization of dual-cured resin cement. Four ceramic discs were used, one for each opacity framework covered by their respective ceramic veneering, and a cement group without a ceramic cover. The degree of conversion for each resin cement was estimated using the Knoop microhardness test. The group with the highest opacity showed the lowest hardness score at baseline. The study concluded that the opacity level of lithium disilicate framework could influence the degree of polymerization of a dual-cured resin cement...
March 2017: European Journal of Prosthodontics and Restorative Dentistry
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