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https://www.readbyqxmd.com/read/28420829/bonding-measurement-strength-and-fracture-mechanics-approaches
#1
Chuchai Anunmana, Wiroj Wansom
This study investigated the effect of cross-sectional areas on interfacial fracture toughness and bond strength of bilayered dental ceramics. Zirconia core ceramics were veneered and cut to produce specimens with three different cross-sectional areas. Additionally, monolithic specimens of glass veneer were also prepared. The specimens were tested in tension until fracture at the interface and reported as bond strength. Fracture surfaces were observed, and the apparent interfacial toughness was determined from critical crack size and failure stress...
April 18, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28402734/masking-colored-substrates-using-monolithic-and-bilayer-cad-cam-ceramic-structures
#2
G R Basso, A B Kodama, A H Pimentel, M R Kaizer, A Della Bona, R R Moraes, N Boscato
OBJECTIVE: To evaluate the masking ability and translucency of monolithic and bilayer CAD-CAM ceramic structures. METHODS: Discs of high translucency (HT) and low translucency (LT) lithium disilicate-based ceramic (IPS e.max CAD) with different thicknesses (0.7, 1, 1.5, and 2 mm) were evaluated as a monolithic structure or combined (bilayer) with a 0.5-mm-thick zirconia framework (IPS e.max ZirCAD). The masking ability and translucency were calculated based on CIE L*a*b* color coordinates measured with a spectrophotometer (SP60, X-Rite)...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28386488/esthetic-reconstruction-of-diastema-with-adhesive-tooth-colored-restorations-and-hyaluronic-acid-fillers
#3
Supawadee Naorungroj
Objective. This report presents a comprehensive esthetic treatment with adhesive tooth-colored restorations in a combination with hyaluronic acid (HA) fillers of diastema in an orthodontic patient with relapse. Case Report. A 36-year-old female patient consulted about 1.5-2 mm midline diastema after an orthodontic relapse of replacing missing central incisors with lateral incisors and dark-colored gingival tissue as a result of a metal post and core with porcelain fused to a metal (PFM) crown at the left lateral incisor...
2017: Case Reports in Dentistry
https://www.readbyqxmd.com/read/28385443/effectiveness-of-high-power-leds-to-polymerize-resin-cements-through-ceramics-an-in%C3%A2-vitro-study
#4
André L Faria-E-Silva, Carmem S Pfeifer
STATEMENT OF PROBLEM: The cementation of ceramic veneers using light-polymerized resin cement is largely dependent on the proper light activation of the cement. Light activation using high irradiance could shorten the time required to lute multiple restorations. PURPOSE: The purpose of this in vitro study was to evaluate the light transmission of dental light-polymerizing units through ceramic cylinders and its effect on the polymerization kinetics of a resin cement...
April 3, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28385435/effect-of-repeated-ceramic-firings-on-the-marginal-and-internal-adaptation-of-metal-ceramic-restorations-fabricated-with-different-cad-cam-technologies
#5
Hasan Kocaağaoğlu, Haydar Albayrak, Halil Ibrahim Kilinc, Hasan Önder Gümüs
STATEMENT OF PROBLEM: The use of computer-aided design and computer-aided manufacturing (CAD-CAM) for metal ceramic restorations has increased with advances in the technology. However, little is known about the marginal and internal adaptation of restorations fabricated using laser sintering (LS) and soft milling (SM). Moreover, the effects of repeated ceramic firings on the marginal and internal adaptation of metal ceramic restorations fabricated with LS and SM is also unknown. PURPOSE: The purpose of this in vitro study was to investigate the effects of repeated ceramic firings on the marginal and internal adaptation of metal ceramic copings fabricated using the lost wax (LW), LS, and SM techniques...
April 3, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28385431/color-stability-of-ceramic-laminate-veneers-cemented-with-light-polymerizing-and-dual-polymerizing-luting-agent-a-split-mouth-randomized-clinical-trial
#6
Ana Maria Estivalete Marchionatti, Vinícius Felipe Wandscher, Michele Mirian May, Marco Antonio Bottino, Liliana Gressler May
STATEMENT OF PROBLEM: The color stability of luting agents influences the esthetics of ceramic laminate veneers. Clinical studies that have evaluated the color changes of veneers cemented to enamel with light- and dual-polymerizing resin cement are lacking. PURPOSE: The purpose of this split-mouth randomized clinical trial was to evaluate the color change and marginal discoloration of dual- and light-polymerizing cement used for cementation of ceramic laminate veneers...
April 3, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28341059/masking-properties-of-ceramics-for-veneer-restorations
#7
Andreas L Skyllouriotis, Hideo L Yamamoto, Dan Nathanson
STATEMENT OF PROBLEM: The translucency and opacity of ceramics play a significant role in emulating the natural color of teeth, but studies of the masking properties and limitations of dental ceramics when used as monolayer restorations are lacking. PURPOSE: The purpose of this in vitro study was to determine the translucency of 6 materials used for veneer restorations by assessing their translucency parameters (TPs), contrast ratios (CRs), and potential to mask dark tooth colors...
March 21, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28280760/the-shear-bond-strength-of-porcelain-laminate-to-prepared-and-unprepared-anterior-teeth
#8
Ali Asghar Alavi, Zeinab Behroozi, Farid Nik Eghbal
STATEMENT OF THE PROBLEM: Porcelain laminate veneer is an esthetic restoration used as an alternative to full veneer crowns and requires minimal tooth preparation. In restoration with porcelain laminate veneers, both the longevity of the laminate and conservation of the sound tooth structure are imperative. PURPOSE: The present study aimed to investigate the shear bond strength of porcelain laminates to prepared- and unprepared- anterior teeth in order to compare their longevity and success rate...
March 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28279435/three-dimensional-characterization-and-distribution-of-fabrication-defects-in-bilayered-lithium-disilicate-glass-ceramic-molar-crowns
#9
Yutao Jian, Zi-Hua He, Li Dao, Michael V Swain, Xin-Ping Zhang, Ke Zhao
OBJECTIVE: To investigate and characterize the distribution of fabrication defects in bilayered lithium disilicate glass-ceramic (LDG) crowns using micro-CT and 3D reconstruction. METHODS: Ten standardized molar crowns (IPS e.max Press; Ivoclar Vivadent) were fabricated by heat-pressing on a core and subsequent manual veneering. All crowns were scanned by micro-CT and 3D reconstructed. Volume, position and sphericity of each defect was measured in every crown. Each crown was divided into four regions-central fossa (CF), occlusal fossa (OF), cusp (C) and axial wall (AW)...
March 6, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28262271/the-impact-of-resin-coating-on-sub-critical-crack-extension-in-a-porcelain-laminate-veneer-material
#10
Xu Cao, Garry J P Fleming, Owen Addison
OBJECTIVES: Characterisation of the interaction between crack extension, crack stabilisation and stress/strain relaxation in the polymeric matrix, the interplay between stress corrosion cracking and the mechanical response of a resin-based luting adhesive within a surface defect population could extend PLV restoration longevity by optimising cementation protocols. The aim was to investigate the influence of stress corrosion cracking and the viscoelastic behaviour of a resin-based luting adhesive independently by controlling the environmental conditions operative during test specimen fabrication...
March 2, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28259023/effects-of-build-orientation-and-element-partitioning-on-microstructure-and-mechanical-properties-of-biomedical-ti-6al-4v-alloy-produced-by-laser-sintering
#11
P Mengucci, A Gatto, E Bassoli, L Denti, F Fiori, E Girardin, P Bastianoni, B Rutkowski, A Czyrska-Filemonowicz, G Barucca
Direct Metal Laser Sintering (DMLS) technology was used to produce tensile and flexural samples based on the Ti-6Al-4V biomedical composition. Tensile samples were produced in three different orientations in order to investigate the effect of building direction on the mechanical behavior. On the other hand, flexural samples were submitted to thermal treatments to simulate the firing cycle commonly used to veneer metallic devices with ceramics in dental applications. Roughness and hardness measurements as well as tensile and flexural mechanical tests were performed to study the mechanical response of the alloy while X-ray diffraction (XRD), electron microscopy (SEM, TEM, STEM) techniques and microanalysis (EDX) were used to investigate sample microstructure...
February 24, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28258266/effect-of-newly-developed-resin-cements-and-thermocycling-on-the-strength-of-porcelain-laminate-veneers
#12
Fawaz I Alqahtani
AIM: The aim of this study was to determine the effect of different luting cements and accelerated artificial aging (AAA) in the fracture resistance of porcelain laminate veneers (PLVs). MATERIALS AND METHODS: A total of 80 disc-shaped specimens were prepared using computer-aided design/computer-aided milling technology from lithium disilicate glass-ceramic blocks. Specimens (0.5 mm thick, 10 mm diameter) were divided into eight groups of 10 specimens per group...
March 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28257250/ceramic-veneers-for-esthetic-restoration-of-retained-primary-teeth-a-4-year-follow-up-case-report
#13
M S Bin-Shuwaish
Retained primary teeth in the smile zone can cause patient dissatisfaction, especially if associated with malposition of teeth. Orthodontic and prosthetic treatment options to treat the situation may not be accepted by some patients. Therefore, these patients tend to maintain their primary teeth and seek different esthetic options. Ceramic veneers may provide an esthetic treatment option to restore these teeth. However, the survival rates of ceramic restorations in such cases have not yet been established. This case report provides a step-by-step clinical description of the use of ceramic veneers for the restoration of retained primary canines and mild teeth malalignment, with a 4-year follow-up report, in a 28-year-old female patient...
March 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28253587/-effect-of-ceramic-thickness-and-resin-cement-shades-on-final-color-of-heat-pressed-ceramic-veneers
#14
D F Ren, K R Zhan, X D Chen, W Z Xing
Objective: To analyze the effect of ceramic materials thickness and resin cement shades on the final color of ceramic veneers in the discolored teeth, and to investigate the color agreement of try-in pastes to the corresponding resin cements. Methods: Sixty artificial maxillary central incisor teeth (C2 shade) were used to simulate the natural discolored teeth and prepared according to veneer tooth preparation protocol. Veneers of different thickness in the body region (0.50 and 0.75 mm) were fabricated using ceramic materials (LT A2 shade, IPS e...
February 9, 2017: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/28243301/fracture-strength-of-three-unit-implant-supported-fixed-partial-dentures-with-excessive-crown-height-fabricated-from-different-materials
#15
Vahideh Nazari, Safoura Ghodsi, Marzieh Alikhasi, Majid Sahebi, Ahmad Reza Shamshiri
OBJECTIVES: Fracture strength is an important factor influencing the clinical long-term success of implant-supported prostheses especially in high stress situations like excessive crown height space (CHS). The purpose of this study was to compare the fracture strength of implant-supported fixed partial dentures (FPDs) with excessive crown height, fabricated from three different materials. MATERIALS AND METHODS: Two implants with corresponding abutments were mounted in a metal model that simulated mandibular second premolar and second molar...
November 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28222866/shear-bond-strength-of-zirconia-based-ceramics-veneered-with-2-different-techniques
#16
Ahmed M Zaher, J L Hochstedler, Frederick A Rueggeberg, Edwin L Kee
STATEMENT OF PROBLEM: Delamination of veneering ceramic is reported as one of the most frequent problems associated with veneered zirconia restorations. PURPOSE: The purpose of this in vitro study was to compare the shear bond strength of sintered lithium disilicate to that of pressed fluorapatite glass-ceramic on a zirconia substrate. MATERIAL AND METHODS: Thirty zirconia blocks (20×15×2.5-mm thick) were cut, sintered, and divided into 2 groups...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28216846/three-dimensional-finite-element-analysis-of-the-stress-distribution-pattern-in-a-mandibular-first-molar-tooth-restored-with-five-different-restorative-materials
#17
Kathleen Manuela D'souza, Meena Ajay Aras
INTRODUCTION: Badly broken or structurally compromised posterior teeth are frequently associated with crown/root fracture. Numerous restorative materials have been used to fabricate indirect full-coverage restorations for such teeth. This study aims to evaluate and compare the effect of restorative materials on the stress distribution pattern in a mandibular first molar tooth, under varying loading conditions and to compare the stress distribution pattern in five commonly used indirect restorative materials...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28212978/a-systematic-review-of-the-survival-and-complication-rates-of-inlay-retained-fixed-dental-prostheses
#18
REVIEW
Junyu Chen, He Cai, Lai Suo, Yiyuan Xue, Jian Wang, Qianbing Wan
OBJECTIVES: The aim of this systematic review was to investigate the survival and complication rates of inlay-retainer fixed dental prostheses (IRFDPs). DATA/SOURCES: A systematic search was conducted in the PubMed, EMBASE, and Cochrane Library databases in English and time filters (articles published from 1960) were used. STUDY SELECTION: Randomized controlled trails (RCTs), controlled clinical trials (CCTs) and prospective cohort studies on IRFDPs with a mean follow-up period of at least 2 years were included...
February 23, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28209008/effect-of-resin-bonded-luting-agents-influencing-marginal-discrepancy-in-all-ceramic-complete-veneer-crowns
#19
Dhanraj Ganapathy, Anusha Sathyamoorthy, Hemalatha Ranganathan, Karthikeyan Murthykumar
INTRODUCTION: Marginal discrepancy severely affects the long term success of All ceramic complete veneer crowns. The precise role of resin luting agents influencing this phenomenon needs to be explored further. AIM: To estimate and compare the marginal discrepancy in CAD/CAM processed All ceramic complete veneer crowns prior and following luting with resin bonded luting agents. MATERIALS AND METHODS: Extracted human maxillary first premolars were randomly allocated into four groups of 27 samples each Viz...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28198977/degree-of-conversion-and-bond-strength-of-resin-cements-to-feldspathic-ceramic-using-different-curing-modes
#20
Veridiana Resende Novais, Luís Henrique Araújo Raposo, Rafael Resende de Miranda, Camila de Carvalho Almança Lopes, Paulo Cézar Simamoto, Carlos José Soares
Objective: The aim of this study was to assess the performance of resin cements when different curing modes are used, by evaluating the degree of conversion and bond strength to a ceramic substrate. Material and Methods: Three resin cements were evaluated, two dual-cured (Variolink II and RelyX ARC) and one light-cured (Variolink Veneer). The dual-cured resin cements were tested by using the dual activation mode (base and catalyst) and light-activation mode (base paste only)...
January 2017: Journal of Applied Oral Science: Revista FOB
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