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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/28633093/fracture-resistance-of-ceramic-and-polymer-based-occlusal-veneer-restorations
#2
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/28621271/effect-of-sandblasting-angle-and-distance-on-biaxial-flexural-strength-of-zirconia-based-ceramics
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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/28571295/dental-avengers-taking-retainer-stability-and-aesthetics-into-next-era
#12
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/28569446/the-effect-of-lithium-disilicate-opacity-on-polymerization-of-a-dual-cured-resin-cement
#13
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
https://www.readbyqxmd.com/read/28556432/randomized-controlled-clinical-trial-comparing-one-piece-and-two-piece-dental-implants-supporting-fixed-and-removable-dental-prostheses-4-to-6-year-observations
#14
Felix B Gamper, Goran I Benic, Ignacio Sanz-Martin, Asgeir G Asgeirsson, Christoph H F Hämmerle, Daniel S Thoma
OBJECTIVES: To test whether or not a one- (S1) and a two-piece (S2) dental implant systems render the same biological, technical, and esthetic outcomes regarding implants and implant-supported reconstructions over an observation period of 4 to 6 years. MATERIALS AND METHODS: Sixty patients were randomly assigned to receive S1 or S2 implants. The implants were restored with either fixed or removable prostheses. The insertion of the final reconstruction was chosen as baseline...
May 29, 2017: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/28555208/comparison-of-immediately-loaded-flapless-placed-one-piece-implants-and-flapped-placed-conventionally-loaded-two-piece-implants-both-fitted-with-all-ceramic-single-crowns-%C3%A2-in-the-posterior-mandible-3-year-results-from-%C3%A2-a-randomised-controlled-pilot-trial
#15
Wolfgang Bömicke, Olaf Gabbert, Andreas Koob, Johannes Krisam, Peter Rammelsberg
PURPOSE: To compare outcomes for immediately loaded one-piece implants (OPI), placed flapless, and conventionally loaded two-piece implants (TPI), placed after two-stage flapped surgery. MATERIALS AND METHODS: Thirty-eight participants were randomised to receive either one OPI (19 participants, OPI group) or one TPI (19 participants, TPI group) inserted in the posterior mandible with a torque of at least 35 Ncm according to a parallel group design. OPI were immediately loaded with non-occluding temporary crowns...
2017: European Journal of Oral Implantology
https://www.readbyqxmd.com/read/28552290/color-match-of-a-feldspathic-ceramic-cad-cam-material-for-ultrathin-laminate-veneers-as-a-function-of-substrate-shade-restoration-color-and-thickness
#16
Taylan Sarı, Çağrı Ural, Emir Yüzbaşıoğlu, İbrahim Duran, Seda Cengiz, İdris Kavut
STATEMENT OF PROBLEM: The final color of a ceramic restoration, especially an ultrathin veneer, is important, but selecting the correct shade is difficult because the substrate can affect the final color of the restoration. PURPOSE: The purpose of this in vitro study was to investigate the effect of substrate shade and thickness on the final color of ultrathin laminate veneers milled from feldspathic ceramic and to present a simple methodology with which a clinician can visualize the effects of substrate color, ceramic thickness, and prefabricated computer-aided design and computer-aided manufacturing (CAD-CAM) block color on the final color of the restoration...
May 26, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28533015/in%C3%A2-vitro-comparison-of-the-load-bearing-capacity-of-ceramic-and-metal-ceramic-resin-bonded-fixed-dental-prostheses-in-the-posterior-region
#17
Wolfgang Bömicke, Moritz Waldecker, Johannes Krisam, Peter Rammelsberg, Stefan Rues
STATEMENT OF PROBLEM: The clinical use of ceramic resin-bonded fixed dental prostheses (RBFDPs) in the posterior region is desirable for esthetic and biological reasons but has been associated with many technical problems, including fractures or chipping of the veneer. Although these problems may be overcome by using monolithic zirconia, information is lacking about the load-bearing capacity of resin-bonded monolithic zirconia restorations for replacing a molar. PURPOSE: The purpose of this in vitro study was to compare the load-bearing capacity (Fu), the load at initial damage (F1d), and the failure pattern of posterior RBFDPs fabricated from monolithic zirconia (MZr), veneered zirconia (VZr), and veneered cobalt-chromium (VCo)...
May 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28533014/esthetic-planning-with-a-digital-tool-a-clinical-report
#18
Adriana V Martins, Rodrigo C Albuquerque, Telmo R Santos, Luiza M Silveira, Rodrigo R Silveira, Guilherme C Silva, Nelson R F A Silva
This clinical report describes digital planning and execution using a novel software tool to enhance digital workflow. The proposed treatment, integrated with the face of the patient, was presented before clinical treatment. The patient was rehabilitated with ceramic veneers. The virtual design contributed to a satisfactory and predictable esthetic outcome.
May 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28513977/use-of-high-performance-polymers-as-dental-implant-abutments-and-frameworks-a-case-series-report
#19
Mohammad Al-Rabab'ah, Wala'a Hamadneh, Ismail Alsalem, Ameen Khraisat, Ashraf Abu Karaky
Dental implant abutments can be made of different materials including titanium, gold, zirconia, alumina, and polymeric materials. Polyetheretherketone (PEEK) is a high performance thermoplastic polymer that can be used as a dental implant abutment material. It has an elastic modulus comparable to bone and can reduce stress shielding. PEEK is a radiolucent material that can allow better radiographic imaging of peri-implant tissues and can be veneered with composite materials or bonded to ceramics. PEEK is widely used in orthopedic and spinal surgeries, and it possesses mechanical and biological characteristics that encourage its use as dental implant abutments...
May 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28509509/fracture-of-zirconia-abutment-with-metallic-insertion-on-anterior-single-titanium-implant-with-internal-hexagon-retrieval-analysis-of-a-failure
#20
Marco Antonio Bottino, Regina Furbino Villefort Rocha, Lilian Costa Anami, Mutlu Özcan, Renata Marques de Melo
This case report presents a retrieval analysis of a screw-retained one-piece restoration with the veneering ceramic fired directly onto the zirconia abutment that fractured during insertion. A patient who experienced root fracture of a maxillary left central incisor received a titanium implant on the same day as extraction. After delayed implant loading, a two-piece zirconia abutment with metallic insertion was customized. Upon installation, a horizontal fracture of the crown just above the metallic portion was detected...
September 2016: European Journal of Prosthodontics and Restorative Dentistry
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