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https://www.readbyqxmd.com/read/28725128/quality-of-communication-between-dentists-and-dental-laboratory-technicians-for-fixed-prosthodontics-in-riyadh-saudi-arabia
#1
Huda Tulbah, Eman AlHamdan, Amal AlQahtani, Asma AlShahrani, Mona AlShaye
The fabrication of a clinically acceptable dental prosthesis requires proper communication between the dentist and the dental technician. Prosthodontic educators have been concerned with this interaction and communication. Fixed prosthodontics laboratories revealed that the technicians are often dissatisfied with the information provided in work authorizations. OBJECTIVE: To evaluate the quality of communication between dentists and laboratory technicians via work authorizations for fixed prosthodontics in both governmental and private dental laboratories in Riyadh area from the technician's perspective...
July 2017: Saudi Dental Journal
https://www.readbyqxmd.com/read/28698944/petra-msvat-space-and-semac-sequences-for-metal-artefact-reduction-in-dental-mr-imaging
#2
Tim Hilgenfeld, Marcel Prager, Alexander Heil, Franz Sebastian Schwindling, Mathias Nittka, David Grodzki, Peter Rammelsberg, Martin Bendszus, Sabine Heiland
OBJECTIVES: Dental MRI is often impaired by artefacts due to metallic dental materials. Several sequences were developed to reduce susceptibility artefacts. Here, we evaluated a set of sequences for artefact reduction for dental MRI for the first time. METHODS: Artefact volume, signal-to-noise ratio (SNR) and image quality were assessed on a 3-T MRI for pointwise encoding time reduction with radial acquisition (PETRA), multiple-slab acquisition with view angle tilting gradient, based on a sampling perfection with application-optimised contrasts using different flip angle evolution (SPACE) sequence (MSVAT-SPACE), slice-encoding for metal-artefact correction (SEMAC) and compared to a standard SPACE and a standard turbo-spin-echo (TSE) sequence...
July 11, 2017: European Radiology
https://www.readbyqxmd.com/read/28689903/survival-of-2039-complete-arch-fixed-implant-supported-zirconia-prostheses-a-retrospective-study
#3
Avinash S Bidra, Michael Tischler, Claudia Patch
STATEMENT OF PROBLEM: Presently, data for the survival of 1-piece complete arch fixed implant-supported zirconia prostheses are limited. PURPOSE: The purpose of this retrospective study was to evaluate the survival outcomes of 1-piece complete arch fixed implant-supported zirconia prostheses fabricated by a single dental laboratory supporting several clinicians. MATERIAL AND METHODS: Outcome data were collected over a 5-year period from a large commercial dental laboratory that fabricated 2039 1-piece complete arch fixed implant-supported monolithic zirconia prostheses...
July 6, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28689902/effect-of-layered-manufacturing-techniques-alloy-powders-and-layer-thickness-on-metal-ceramic-bond-strength
#4
Orhun Ekren, Ahmet Ozkomur, Yurdanur Ucar
STATEMENT OF PROBLEM: Direct metal laser sintering (DMLS) and direct metal laser melting (DMLM) have become popular for fabricating the metal frameworks of metal-ceramic restorations. How the type of layered manufacturing device, layer thickness, and alloy powder may affect the bond strength of ceramic to metal substructure is unclear. PURPOSE: The purpose of this in vitro study was to evaluate the bond strength of dental porcelain to metal frameworks fabricated using different layered manufacturing techniques (DMLS and DMLM), Co-Cr alloy powders, and layer thicknesses and to evaluate whether a correlation exists between the bond strength and the number of ceramic remnants on the metal surface...
July 6, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28675013/-comparison-among-three-translucency-parameters
#5
Xiong Fang, Xia Hui
OBJECTIVE: This study aims to compare the three commonly used translucency parameters in prosthodontics: transmittance (T), contrast ratio (CR), and translucency parameter (TP). METHODS: Six platelet specimens were composed of Vita enamel and dental porcelain. The initial thickness was 1.2 mm. The specimens were gradually ground to 1.0, 0.8, 0.6, 0.4, and 0.2 mm. T, color parameters, and reflection were measured by a spectrocolorimeter for each corresponding thickness...
June 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28645666/color-masking-measurement-for-ceramic-coating-of-titanium-used-for-dental-implants
#6
Khaldoun Ajlouni, Waleed Elshahawy, Raed Ajlouni, Abdelfattah Sadakah
STATEMENT OF PROBLEM: Poor implant placement or thin gingival tissue and progressive bone resorption may lead to the dark metal color showing through the peri-implant soft tissue. Whether the dark color can be adequately masked is unclear. PURPOSE: The purpose of this in vitro study was to test the color masking effect of porcelain applied on titanium used in fabricating the polished collar of tissue level implants. MATERIAL AND METHODS: Type 4 commercially pure titanium disks and 5 porcelain dentin shades (A2, A3, B2, C2, and D3) were used...
June 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28645663/failure-torque-of-ceramic-neck-titanium-implant
#7
Waleed Elshahawy, Raed Ajlouni, Khaldoun Ajlouni, Abdelfattah Sadakah
STATEMENT OF PROBLEM: Dental implants are typically made of titanium. However, with the current systems on the market, the implant neck often shows through the gingival tissues as a black or dark gray line and/or as a grayish discoloration of the peri-implant soft tissue. PURPOSE: The purpose of this in vitro study was to test a new implant design. The key component of this design is the ceramic shell that covers the polished collar of the tissue-level titanium implant and masks its dark color to mimic natural dentition...
June 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28642930/a-novel-etching-technique-for-surface-treatment-of-zirconia-ceramics-to-improve-adhesion-of-resin-based-luting-cements
#8
Eystein Ivar Ruyter, Nalini Vajeeston, Torbjørn Knarvang, Ketil Kvam
Objectives: Bonding of zirconia crowns and bridges to abutments is important, not only bonding of the thin resin layer to the abutment, but also bonding to the zirconia ceramic is crucial. Both mechanical and chemical adhesion are desired. Mechanical retention of dental porcelain achieved by etching with moderately concentrated hydrofluoric acid is not possible with zirconia ceramics. The purpose of this study was to show that etching is possible with relative low melting fluoride compounds such as ammonium hydrogen difluoride and potassium hydrogen difluoride...
January 2017: Acta Biomaterialia Odontologica Scandinavica
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/28586235/new-high-translucent-cubic-phase-containing-zirconia-clinical-and-laboratory-considerations-and-the-effect-of-air-abrasion-on-strength
#11
Edward A McLaren, Nathaniel Lawson, James Choi, Juan Kang, Carlos Trujillo
Fabricating all-ceramic restorations with minimal or no application of a secondary phase while maintaining esthetics has been a sought-after goal of the dental profession. The objective has been development of a monolithic material with optical properties similar to the natural tooth without the need for layering porcelain. This article examines some of the newer cubic zirconia materials used in a monolithic form. The authors discuss laboratory-processing issues that affect esthetics, including evaluation of colorizing, sintering, finishing, and polishing, and assess initial translucency testing of several materials while evaluating the effect of air abrasion on flexural strength of these cubic zirconias...
June 2017: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/28494037/effect-of-abutment-preparation-and-fatigue-loading-in-a-moist-environment-on-the-fracture-resistance-of-the-one-piece-zirconia-dental-implant
#12
Mohamed Kamel, Tritala K Vaidyanathan, Robert Flinton
PURPOSE: One-piece zirconia dental implants have been widely used in Europe for many years. This in vitro study was done to evaluate the effect of abutment preparation and fatigue (cyclic) loading in a moist environment on the fracture resistance of the one-piece zirconia dental implant. MATERIALS AND METHODS: Twenty-four Cera Root zirconium oxide dental implants, divided into three groups of eight, were used in this study: group 1 (control group): implants with no preparation, tested in a dry environment; group 2: implants with no preparation, tested in a moist environment (simulating clinical conditions); and group 3: implants after abutment preparation tested in a moist environment...
May 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28492748/influence-of-resin-cements-on-color-stability-of-different-ceramic-systems
#13
Renata Borges Rodrigues, Erick de Lima, Marina Guimarães Roscoe, Carlos José Soares, Paulo Francisco Cesar, Veridiana Resende Novais
The purpose of this study was to evaluate color stability of two dental ceramics cemented with two resin cements, assessing the color difference (ΔE00) by the measurement of L*, a*, b*, c* and h* of transmittance. The combination of two ceramic system (feldspathic and lithium disilicate) and two resin cements - color A3 (RelyX ARC and Variolink II) resulted in 4 groups (n=5). Ten disks-shaped specimens were fabricated for each ceramic system (10x1.5 mm), etched with hydrofluoric acid (10%) and silanized prior to cementation...
March 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/28482471/comparison-of-the-osteogenic-adipogenic-chondrogenic-and-cementogenic-differentiation-potential-of-periodontal-ligament-cells-cultured-on-different-biomaterials
#14
C C Barrera-Ortega, L Hoz-Rodríguez, H Arzate, A Fonseca-García, J Pérez-Alvarez, S E Rodil
It has been shown that the cellular responses such as adhesion, proliferation and differentiation are influenced by the surface properties, such as the topography or the surface energy. However, less is known about the effect of the chemical composition and type of material on the differentiation potential. The objective of the present paper is to compare the differentiation potential of periodontal ligament cells (HPLC) into adipocytes, osteoblasts, chondroblasts and cementoblasts of three type of materials (metals, ceramics and polymers) without using any biological induction media, but keeping the average roughness values within a limited range of 2...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28466248/comparative-evaluation-of-the-stability-of-two-different-dental-implant-designs-and-surgical-protocols-a-pilot-study
#15
David E Simmons, Pooja Maney, Austin G Teitelbaum, Susan Billiot, Lomesh J Popat, A Archontia Palaiologou
BACKGROUND: The purpose of this study was to compare a parallel wall design implant to a tapered apex design implant when placed in the posterior maxilla using two different surgical protocols. METHODS: Twenty-seven patients (30 implants) were divided into three groups. All implants were 4 mm wide in diameter and 8 mm long. Group A received 10 tapered implants (OSPTX) (Astra Tech OsseoSpeed TX™) using the soft bone surgical protocol (TXSoft). Group B received 10 tapered implants (OSPTX) (AstraTech OsseoSpeedTX™) using the standard surgical protocol (TXStd)...
December 2017: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/28428604/in-vitro-cavity-and-crown-preparations-and-direct-restorations-a-comparison-of-performance-at-the-start-and-end-of-the-fd-programme
#16
F J T Burke, V Ravaghi, L Mackenzie, N Priest, H C Falcon
Aim To assess the performance and thereby the progress of the FDs when they carried out a number of simulated clinical exercises at the start and at the end of their FD year.Methods A standardised simulated clinical restorative dentistry training exercise was carried out by a group of 61 recently qualified dental graduates undertaking a 12 months' duration foundation training programme in England, at both the start and end of the programme. Participants completed a Class II cavity preparation and amalgam restoration, a Class IV composite resin restoration and two preparations for a porcelain-metal full crown...
April 21, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28402342/survival-rates-and-bone-and-soft-tissue-level-changes-around-one-piece-dental-implants-placed-with-a-flapless-or-flap-protocol-8-5-year-results
#17
Stuart J Froum, Ismael Khouly
The purpose of the current study was to determine the survival rates and to measure marginal bone changes and peri-implant conditions 8.5 years after placement of one-piece implants with an anodically oxidized surface (AOS). A total of 52 subjects who received a one-piece implant with an AOS using a flapless or flap protocol and completed a previous randomized clinical trial were contacted for a recall visit 8.5 years after implant placement (T8.5). Implant success and survival rates, probing pocket depth (PPD), presence of bleeding on probing (BoP), papilla level, and incidence of complications and peri-implant disease were assessed by a single, blinded examiner...
May 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/28383305/a-digital-image-correlation-analysis-of-strain-generated-by-3-unit-implant-supported-fixed-dental-prosthesis-an-in-vitro-study
#18
Raniel F Peixoto, Ana P Macedo, Janisse Martinelli, Adriana C Lapria Faria, Rodrigo Tiossi, Ricardo F Ribeiro, Maria da G C de Mattos
OBJECTIVE: To evaluate the influence of different veneering materials (porcelain and resin) and implants (short and conventional) in the strain distribution of implant-supported splinted fixed partial dentures (FPDs) using digital image correlation (DIC). MATERIAL AND METHODS: Four polyurethane models were fabricated with resin replicas (first premolar) and short and/or conventional implants replacing the second premolar and first and second molars, according to the following configurations: G1, 2 conventional (second premolar and first molar) and 1 short (second molar) implant; G2, 1 conventional (second premolar) and 2 short (first and second molar) implants; G3, 3 short implants; G4, 3 conventional implants...
August 2017: Implant Dentistry
https://www.readbyqxmd.com/read/28343670/comparison-of-porcelain-bond-strength-of-different-metal-frameworks-prepared-by-using-conventional-and-recently-introduced-fabrication-methods
#19
Necati Kaleli, Duygu Saraç
STATEMENT OF PROBLEM: Most studies evaluating dental laser sintering systems have focused on the marginal accuracy of the restorations. However, the bond strength at the metal-ceramic interface is another important factor that affects the survival of restorations, and currently, few studies focus on this aspect. PURPOSE: The purpose of this in vitro study was to compare the porcelain bond strength of cobalt-chromium (Co-Cr) metal frameworks prepared by using the conventional lost-wax technique, milling, direct metal laser sintering (DMLS), and laser cusing, a direct process powder-bed system...
March 23, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28279436/characterisation-of-nanovoiding-in-dental-porcelain-using-small-angle-neutron-scattering-and-transmission-electron-microscopy
#20
Alexander Lunt, Ann Terry, Siqi Ying, Nikolaos Baimpas, Tan Sui, Saurabh Kabra, Joe Kelleher, Stephen King, Neo Tee Khin, Alexander M Korsunsky
OBJECTIVES: Recent studies of the yttria partially stabilised zirconia-porcelain interface have revealed the presence of near-interface porcelain nanovoiding which reduces toughness and leads to component failure. One potential explanation for these nanoscale features is thermal creep which is induced by the combination of the residual stresses at the interface and sintering temperatures applied during manufacture. The present study provides improved understanding of this important phenomenon...
March 6, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
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