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https://www.readbyqxmd.com/read/29705528/influence-of-ageing-on-glass-and-resin-bonding-of-dental-glass-ceramic-veneer-adhesion-to-zirconia-a-fracture-mechanics-analysis-and-interpretation
#1
M V Swain, C Gee, K-C Li
Adhesion plays a major role in the bonding of dental materials. In this study the adhesion of two glass-ceramic systems (IPS e.max and VITABLOCS) to a zirconia sintered substrate using a glass (for IPS e.max) and resin (VITABLOCS) before and after exposure to ageing for 14 days in distilled water at 37°C are compared using two interfacial fracture mechanics tests, the 3 point bend Schwickerath (1,2) and 4 point bend [3] approaches. Both tests result in stable crack extension from which the strain energy release rate (G, N/m or J/m2 ) can be determined...
April 26, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29679700/toxicity-of-porcelain-fused-to-metal-substrate-to-zebrafish-danio-rerio-embryos-and-larvae
#2
Libo Zhao, Jing Si, Yuan Wei, Sirui Li, Yanjiao Jiang, Rong Zhou, Bin Liu, Hong Zhang
AIMS: Porcelain-fused-to-metal (PFM) crowns are a standard restoration technique in dentistry, but toxicity of PFM in vivo has not been systematically evaluated. The present study evaluated the effects of various metal alloy shells of PFM crowns on the development of zebrafish embryos and larvae in order to determine the safety of these materials. MAIN METHODS: Gold palladium (Au-Pd), silver palladium (Ag-Pd), Nickel chromium (Ni-Cr), cobalt chromium (Co-Cr), titanium (Ti) alloy porcelain crowns were immersed in artificial saliva for 1, 4, and 7 weeks, and the leach solution was collected and used to treat zebrafish embryos at 4-144 h PFM...
April 18, 2018: Life Sciences
https://www.readbyqxmd.com/read/29670735/microleakage-of-porcelain-laminate-veneers-cemented-with-different-bonding-techniques
#3
Satheesh B Haralur
Background: Porcelain laminate veneers (PLV) are continued to be popular in modern dental practice due to its high aesthetic outcome and conservative tooth preparation. The composite resins are commonly used as luting agents for cementation of PLV. Polymerisation shrinkage induced marginal gap and interfacial leakage is the persistent limitation with the resin luting cements. The objective of the study was to assess the effect of various dentin bonding techniques on the microleakage after accelerated ageing in porcelain laminate veneres...
February 2018: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29621687/viscoelastic-finite-element-analysis-of-residual-stresses-in-porcelain-veneered-zirconia-dental-crowns
#4
Jeongho Kim, Sukirti Dhital, Paul Zhivago, Marina R Kaizer, Yu Zhang
The main problem of porcelain-veneered zirconia (PVZ) dental restorations is chipping and delamination of veneering porcelain owing to the development of deleterious residual stresses during the cooling phase of veneer firing. The aim of this study is to elucidate the effects of cooling rate, thermal contraction coefficient and elastic modulus on residual stresses developed in PVZ dental crowns using viscoelastic finite element methods (VFEM). A three-dimensional VFEM model has been developed to predict residual stresses in PVZ structures using ABAQUS finite element software and user subroutines...
March 21, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29559219/rehabilitation-of-edentulous-jaws-with-zirconia-complete-arch-fixed-implant-supported-prostheses-an-up-to-4-year-retrospective-clinical-study
#5
Michael Tischler, Claudia Patch, Avinash S Bidra
STATEMENT OF PROBLEM: Limited data are available on the clinical outcomes of patients with edentulism treated with zirconia complete-arch fixed implant-supported prostheses (CAFIPs). PURPOSE: The primary purpose of this retrospective clinical study was to study the failure rate of dental implants as well as the fracture rate of zirconia CAFIPs. The secondary purpose was to study the survival outcomes of patients with edentulism treated with zirconia CAFIPs as well as the rate of technical complications...
March 17, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29503711/metal-ceramic-bond-strength-between-a-feldspathic-porcelain-and-a-co-cr-alloy-fabricated-with-direct-metal-laser-sintering-technique
#6
Konstantinos Dimitriadis, Konstantinos Spyropoulos, Triantafillos Papadopoulos
PURPOSE: The aim of the present study was to record the metal-ceramic bond strength of a feldspathic dental porcelain and a Co-Cr alloy, using the Direct Metal Laser Sintering technique (DMLS) for the fabrication of metal substrates. MATERIALS AND METHODS: Ten metal substrates were fabricated with powder of a dental Co-Cr alloy using DMLS technique (test group) in dimensions according to ISO 9693. Another ten substrates were fabricated with a casing dental Co-Cr alloy using classic casting technique (control group) for comparison...
February 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/29502734/corrosion-potential-in-artificial-saliva-and-possible-genotoxic-and-cytotoxic-damage-in-buccal-epithelial-cells-of-patients-who-underwent-ni-cr-based-porcelain-fused-to-metal-fixed-dental-prostheses
#7
Gülce Alp, Gonca Çakmak, Murat Sert, Yavuz Burgaz
Nickel-chromium(Ni-Cr) based alloys account for the majority of the porcelain-fused-to-metal fixed dental prostheses(PFM-FDPs) on account of their superior properties despite both nickel and chromium being known as human carcinogens. Understanding the genotoxicity and the cytotoxicity alongside the characteristics of corrosion behavior of the alloy is vital for understanding their biocompatibility. This study has evaluated whether the Ni-Cr based alloys corroded in artificial saliva by analyzing alloy decomposition at different pH levels and immersion durations(7, 14, 21, and 28 days) using inductively coupled plasma-optic emission spectrophotometry(ICP-OES)...
March 2018: Mutation Research
https://www.readbyqxmd.com/read/29497443/effect-of-ceramic-cooling-protocols-and-zirconia-coloring-on-fracture-load-of-zirconia-based-restorations
#8
Behnaz Ebadian, Ramin Mosharraf, Mahsa Abbasi
Background: Residual thermal stresses in dental porcelains can cause clinical failure. Porcelain cooling protocols may affect the amount of residual stresses within porcelain and also porcelain-zirconia bond strength. The objective of this study was to assess the effect of cooling protocols on the fracture load of porcelain veneered zirconia restorations. Materials and Methods: Forty zirconia bars (31 mm × 6.5 mm × 1.35 mm ± 0.1 mm) were fabricated by computer-aided design and computer-aided manufacturing technology...
January 2018: Dental Research Journal
https://www.readbyqxmd.com/read/29490756/graded-nano-glass-zirconia-material-for-dental-applications-part-ii-biocompatibility-evaluation
#9
Ting Sun, Mengmeng Guo, Yaodong Cheng, Lingling Ou, Ping He, Xiangning Liu, Shuyuan Ma, Renfa Lai
A graded glass/graded zirconia (G/Z) system was previously synthesized via the infiltration of a low modulus nanosized glass into a zirconia surface. The bond strength of G/Z to veneering porcelains was demonstrated to be 3-fold higher than in zirconia-based systems. Nevertheless, biocompatibility testing prior to the possible clinical application of G/Z systems is essential. Herein, such biocompatibility testing was performed with L-929 fibroblasts seeded onto G/Z and yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) for 2-72 h...
December 1, 2017: Journal of Biomedical Nanotechnology
https://www.readbyqxmd.com/read/29484710/an-in-vitro-evaluation-of-fracture-load-of-implant-supported-zirconia-based-prostheses-fabricated-with-different-veneer-materials
#10
Hiroki Takata, Futoshi Komine, Junichi Honda, Markus B Blatz, Hideo Matsumura
OBJECTIVES: The purpose of this in vitro study was to evaluate fracture loads of implant-supported zirconia-based prostheses fabricated with different veneer materials (resin-based material and lithium disilicate ceramics). MATERIAL AND METHODS: Forty-four zirconia-based molar prostheses were fabricated on dental implants and divided into four groups (n = 11): zirconia-based prostheses veneered with feldspathic porcelain (ZVF), zirconia-based prostheses bonded with the lithium disilicate glass-ceramic veneer (ZBD), zirconia-based prostheses veneered with indirect composite resin (ZVC), and zirconia-based prostheses bonded with composite materials fabricated from a CAD/CAM resin block (ZBC)...
April 2018: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/29448564/biocompatibility-evaluation-of-feldspathic-porcelain-with-nano-sized-silver-ion-particles
#11
Ji-Hyun Kim, Sang-Won Park, Hyun-Pil Lim, Chan Park, Kwi-Dug Yun
The major failure of dental restorations is caused by dental caries by S. mutans. This study evaluated the effect of nanosized silver ions in feldspathic porcelain on cytotoxicity and antimicrobial activity. The control group was feldspathic porcelain (Noritake EX-3, Kuraray Noritake Dental Inc., Japan) that did not contain Ag (silver). The experimental groups were feldspathic porcelain mixed with colloidal solutions of nanosized silver ions in mixtures of 5% 10%, 20%, 30%. Cell activity assays evaluated with osteoblast hFOB 1...
February 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448263/comparison-of-coronal-tooth-reductions-resulting-from-different-crown-preparations
#12
James Dudley
PURPOSE: The aim of this study was to quantify the coronal tooth structure reductions (CTSRs) resulting from a variety of different types of crown preparations performed by undergraduate dental students in a simulation clinic teaching program. MATERIALS AND METHODS: A total of 76 students each submitted 21 different crown preparations completed on typodont teeth, which were individually weighed and analyzed in relation to whole and sectioned reference teeth to calculate the CTSR resulting from each preparation...
February 15, 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29434797/effect-of-different-surface-treatments-and-retainer-designs-on-the-retention-of-posterior-pd-ag-porcelain-fused-to-metal-resin-bonded-fixed-partial-dentures
#13
Xiwen Chen, Yixin Zhang, Jinru Zhou, Chenfeng Chen, Zhimin Zhu, Lei Li
The aim of this study was to investigate the adhesive property of palladium-silver alloy (Pd-Ag) and the simulated clinical performance of Pd-Ag porcelain-fused-to-metal (PFM), resin-bonded, fixed partial dentures (RBFPDs). A total of 40 Pd-Ag discs (diameter=5 mm) were prepared and divided into the following four groups (n=10): a) No sandblasting, used as a control; and b, 50 µm; c, 110 µm; and d, 250 µm aluminum oxide (Al2 O3 ) particles, respectively. Another 50 discs were pre-sandblasted and divided into five groups (n=10) subjected to different treatments: e) Sandblasting, used as a control; f) silane; g) alloy primer; h) silica coating + silane and i) silica coating + alloy primer...
February 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29429239/-research-progress-in-cocr-metal-ceramic-alloy-fabricated-by-selective-laser-melting
#14
REVIEW
X Yan, H Lin
Cobalt-chromium alloys have been applied to dental porcelain fused to metal (PFM) restorations over the past decades owing to their excellent corrosion resistance, good biocompatibility and low price. The production of CoCr metal-ceramic restorations has always been based on traditional lost-wax casting techniques. However, in recent years, selective laser melting (SLM) is becoming more and more highly valued by dental laboratories and dental practitioners due to its individuation, precision and efficiency...
February 9, 2018: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/29426786/effect-of-feldspathic-porcelain-layering-on-the-marginal-fit-of-zirconia-and-titanium-complete-arch-fixed-implant-supported-frameworks
#15
Burak Yilmaz, Faris A Alshahrani, Ediz Kale, William M Johnston
STATEMENT OF PROBLEM: Veneering with porcelain may adversely affect the marginal fit of long-span computer-aided design and computer-aided manufacturing (CAD-CAM) implant-supported fixed prostheses. Moreover, data regarding the precision of fit of CAD-CAM-fabricated implant-supported complete zirconia fixed dental prostheses (FDPs) before and after porcelain layering are limited. PURPOSE: The purpose of this in vitro study was to evaluate the effect of porcelain layering on the marginal fit of CAD-CAM-fabricated complete-arch implant-supported, screw-retained FDPs with presintered zirconia frameworks compared with titanium...
February 6, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29399950/a-literature-review-on-the-new-polymer-infiltrated-ceramic-network-material-picn
#16
REVIEW
Júlia Cadorim Facenda, Marcia Borba, Pedro Henrique Corazza
OBJECTIVES: Ceramics and composites are the most used materials for dental application. Recently, the characteristics of both were combined on the called "polymer-infiltrated ceramic-network" (PICN). The aim of this review is to report the behavior of PICN, comparing the findings that may support the correct clinical application. OVERVIEW: The PICN material is a structure with a sintered ceramic matrix infiltrated with a polymer matrix. Studies evaluated this material microstructure and composition, mechanical properties and adhesive behavior...
February 5, 2018: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29333707/impact-of-gastric-acid-induced-surface-changes-on-mechanical-behavior-and-optical-characteristics-of-dental-ceramics
#17
Aditi Kulkarni, James Rothrock, Jeffery Thompson
PURPOSE: To test the impact of exposure to artificial gastric acid combined with toothbrush abrasion on the properties of dental ceramics. Earlier research has indicated that immersion in artificial gastric acid has caused increased surface roughness of dental ceramics; however, the combined effects of acid immersion and toothbrush abrasion and the impact of increased surface roughness on mechanical strength and optical properties have not been studied. MATERIALS AND METHODS: Three commercially available ceramics were chosen for this study: feldspathic porcelain, lithium disilicate glass-ceramic, and monolithic zirconium oxide...
January 14, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29322655/efficiency-of-er-yag-laser-in-debonding-of-porcelain-laminate-veneers-by-contact-and-non-contact-laser-application-modes-in-vitro-study
#18
Mohand ALBalkhi, Eyad Swed, Omar Hamadah
OBJECTIVE: To determine the efficiency of debonding porcelain laminate veneers (PLV) by using several laser parameters and two different application modes of Er:YAG laser [contact (CM) and non-contact (NCM)], by verification of the consumed PLV debonding time and the changes in dental pulp temperature. MATERIALS AND METHODS: Forty extracted non-carious human maxillary premolars were prepared for receiving PLV. Sixteen of them were divided into two groups, each of them comprised eight samples based on the application mode; group A with NCM, and group B with CM...
January 11, 2018: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29304908/incisal-preparation-design-for-ceramic-veneers-a-critical-review
#19
Sy Yin Chai, Vincent Bennani, John M Aarts, Karl Lyons
BACKGROUND: The authors reviewed and identified the evidence for the various incisal preparation designs for ceramic veneers. TYPES OF STUDIES REVIEWED: The authors searched MEDLINE with PubMed and Ovid to identify any articles in the English language related to the topic up through March 2017 using a combination of key words: "porcelain veneer or ceramic veneer or dental veneer or labial veneer" AND "preparation," NOT "composite veneer," NOT "crown," NOT "implant," NOT "fixed partial denture or bridge or denture," NOT "porcelain-fused-to-metal," NOT "marginal gap or fit...
January 2018: Journal of the American Dental Association
https://www.readbyqxmd.com/read/29302294/severe-tetracycline-dental-discoloration-restoration-with-conventional-feldspathic-ceramic-veneers-a-clinical-report
#20
Vicente Faus-Matoses, Ignacio Faus-Matoses, Esther Ruiz-Bell, Vicente J Faus-Llácer
The treatment of severe tetracycline discoloration is a challenge for the dentist. There are several treatment options and one of the most effective is the use of feldspathic veneers. The aim of this clinical case was to carry out the replacement with conventional feldspathic ceramic veneers on a patient with highly stained teeth (grade IV tetracycline) by a minimally invasive approach. Clinical examination revealed gingival retraction, color change of the veneers, ceramic cracked of 1.1 and 1.3 and incisal wear in lower anterior teeth...
November 2017: Journal of Clinical and Experimental Dentistry
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