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https://www.readbyqxmd.com/read/28927393/the-complete-digital-workflow-in-fixed-prosthodontics-a-systematic-review
#1
Tim Joda, Fernando Zarone, Marco Ferrari
BACKGROUND: The continuous development in dental processing ensures new opportunities in the field of fixed prosthodontics in a complete virtual environment without any physical model situations. The aim was to compare fully digitalized workflows to conventional and/or mixed analog-digital workflows for the treatment with tooth-borne or implant-supported fixed reconstructions. METHODS: A PICO strategy was executed using an electronic (MEDLINE, EMBASE, Google Scholar) plus manual search up to 2016-09-16 focusing on RCTs investigating complete digital workflows in fixed prosthodontics with regard to economics or esthetics or patient-centered outcomes with or without follow-up or survival/success rate analysis as well as complication assessment of at least 1 year under function...
September 19, 2017: BMC Oral Health
https://www.readbyqxmd.com/read/28886950/influence-of-thermo-mechanical-cycling-on-porcelain-bonding-to-cobalt-chromium-and-titanium-dental-alloys-fabricated-by-casting-milling-and-selective-laser-melting
#2
Maja Antanasova, Andraž Kocjan, Janez Kovač, Borut Žužek, Peter Jevnikar
PURPOSE: The aim has been to determine the effect of thermo-mechanical cycling on shear-bond-strength (SBS) of dental porcelain to Co-Cr and Ti-based alloys fabricated by casting, computer-numerical-controlled milling, and selective-laser-melting (SLM). METHODS: Seven groups (n=22/group) of metal cylinders were fabricated by casting (Co-Cr and commercially pure-cpTi), milling (Co-Cr, cpTi, Ti-6Al-4V) or by SLM (Co-Cr and Ti-6Al-4V) and abraded with airborne-particles...
September 5, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28876966/the-effect-of-resin-bonding-on-long-term-success-of-high-strength-ceramics
#3
M B Blatz, M Vonderheide, J Conejo
Digital manufacturing, all-ceramics, and adhesive dentistry are currently the trendiest topics in clinical restorative dentistry. Tooth- and implant-supported fixed restorations from computer-aided design (CAD)/computer-aided manufacturing (CAM)-fabricated high-strength ceramics-namely, alumina and zirconia-are widely accepted as reliable alternatives to traditional metal-ceramic restorations. Most recent developments have focused on high-translucent monolithic full-contour zirconia restorations, which have become extremely popular in a short period of time, due to physical strength, CAD/CAM fabrication, and low cost...
September 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28874648/incidence-of-prosthetic-complications-associated-with-implant-borne-prosthesis-in-a-sleep-disorder-center
#4
Venkatesh B Suneel, Santhosh Kotian, Ravikanth H Jujare, Adarsh K Shetty, Sneh Nidhi, Shehkar Grover
BACKGROUND: Obstructive sleep apnea (OSA) is one of the common prevalent conditions present worldwide. The process of abnormal habits related to clenching and grinding of teeth is referred to as bruxism and is characterized under the heading of parafunctional activity of the masticatory system. Osseointegrated dental implants represent advancements in the field of odontology. Despite its high success rate, failure and complications are often associated with dental implant treatment due to a number of factors...
September 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28867661/influence-of-specimens-geometry-and-materials-on-the-thermal-stresses-in-dental-restorative-materials-during-thermal-cycling
#5
Douglas Fabris, Júlio C M Souza, Filipe S Silva, Márcio Fredel, Michael Gasik, Bruno Henriques
OBJECTIVES: Thermal cycling is widely used to simulate the aging of restorative materials corresponding to the changes of temperature in the oral cavity. However, test parameters present in literature vary considerably, which prevents comparison between different reports. The aim of this work is to assess the influence of the specimens' geometry and materials on the thermal stresses developed during thermal cycling tests. MATERIALS AND METHODS: Finite elements method was used to simulate the conditions of thermal cycling tests for three different sample geometries: a three-points bending test sample, a cylinder rod and more complex shape of a restoration crown...
August 31, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28866149/three-dimensional-finite-element-analysis-of-occlusal-splint-and-implant-connection-on-stress-distribution-in-implant-supported-fixed-dental-prosthesis-and-peri-implantal-bone
#6
Vívian Dos Santos Marsico, Roberto Brunow Lehmann, Cristiane Aparecida de Assis Claro, Marina Amaral, Rafael Pino Vitti, Ana Christina Claro Neves, Lais Regiane da Silva Concilio
The aim of this study was to investigate the influence of occlusal splint therapy on the stress distribution of implant-supported fixed dental prosthesis (FDP) and peri-implantal bone structures using three-dimensional (3D) finite element analysis (FEA). The system consisted of two implants (positioned on region of second premolar and second molar) as retainers of fixed porcelain-fused-to-metal 3-unit FDP (first molar as pontic element). Two implant connections systems (external and internal hexagon) were tested...
November 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28833763/effect-of-firing-temperature-at-the-porcelain-metal-alloy-interface-in-porcelain-fused-to-metal-restorations-a-sem-eds-study
#7
Arvind Tripathi, Soumyojeet Bagchi, Juhi Singh
PURPOSE: To probe in greater detail the changes at the ceramometal interface induced by heat energy absorption, using energy diffraction X-ray spectroscopy (EDS) and scanning electron microscopy (SEM) and correlate these changes with the shear bond strength of porcelain to nickel chromium alloy. MATERIALS AND METHODS: Seventy-five strips of nickel-chromium alloy (20 mm long, 5 mm wide, 3 mm thick) were prepared and layered with porcelain, conforming to ANSI/ADA specification no...
August 21, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28822581/favorable-residual-stress-induction-by-resin-cementation-on-dental-porcelain
#8
Garry J P Fleming, Xu Cao, Dan L Romanyk, Owen Addison
OBJECTIVES: Despite developments in polycrystalline ceramics, glassy dental-ceramic materials provide the optimum cosmetic option in most clinical situations to mimic the natural dentition. The clinical success of glassy dental-ceramic materials is often attributed to resin-adhesive bonding techniques. In this study we explore whether shrinkage stresses generated on photo-polymerisation of the resin-cement are sufficient to induce ceramic surface defect stabilization, and we quantify the transient nature of the induced stresses...
August 16, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28792115/digital-workflow-in-full-arch-implant-rehabilitation-with-segmented-minimally-veneered-monolithic-zirconia-fixed-dental-prostheses-2-year-clinical-follow-up
#9
Panos Papaspyridakos, Kiho Kang, Catherine DeFuria, Sarah Amin, Yukio Kudara, Hans-Peter Weber
OBJECTIVE: To illustrate a digital workflow in full-arch implant rehabilitation with minimally veneered monolithic zirconia and to report the outcomes including technical complications. CLINICAL CONSIDERATIONS: Three patients (5 edentulous arches) received full-arch fixed implant rehabilitation with monolithic zirconia and mild facial porcelain veneering involving a digital workflow. The incisal edges and occluding surface areas were milled out of monolithic zirconia to reduce the possibility of chipping...
August 9, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28771388/post-retained-single-crowns-versus-fixed-dental-prostheses-a-7-year-prospective-clinical-study
#10
M Ferrari, R Sorrentino, J Juloski, S Grandini, M Carrabba, N Discepoli, E Ferrari Cagidiaco
Biomechanical integrity of endodontically treated teeth (ETT) is often compromised. Degree of hard tissue loss and type of final prosthetic restoration should be carefully considered when making a treatment plan. The objective of this prospective clinical trial was to assess the influence of the type of prosthetic restoration as well as the degree of hard tissue loss on 7-y clinical performance of ETT restored with fiber posts. Two groups ( n = 60) were defined depending on the type of prosthetic restoration needed: 1) single unit porcelain-fused-to-metal (PFM) crowns (SCs) and 2) 3- to 4-unit PFM fixed dental prostheses (FDPs), with 1 healthy and 1 endodontically treated and fiber post-restored abutment...
August 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28725128/quality-of-communication-between-dentists-and-dental-laboratory-technicians-for-fixed-prosthodontics-in-riyadh-saudi-arabia
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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...
October 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
#20
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
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