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https://www.readbyqxmd.com/read/28717792/accelerated-fatigue-resistance-%C3%A2-of-novel-design-histoanatomic-%C3%A2-implant-restorations-made-of-%C3%A2-cad-cam-bilaminar-assemblies
#1
Ivan Molina, Jack Goldberg, Claudia Maziero Volpato, Pascal Magne
OBJECTIVES: Evaluate the fatigue resistance and failure mode of novel-design implant restorations made of histoanatomic computer-assisted design/computer-assisted manufacturing (CAD/CAM) bilaminar bonded assemblies. MATERIAL AND METHODS: 60 screw-retained implant restorations were fabricated. Monolithic restorations were used as a control group (15 lithium disilicate: group CE; and 15 nanofilled composite resin: group CL), and compared with bilaminar restorations (15 dentin-shaped lithium disilicate mesostructures with a bonded nanofilled composite resin veneer: group CEL; and 15 dentin-shaped nanofilled composite resin mesostructures with a bonded lithium disilicate veneer: group CLE)...
2017: International Journal of Esthetic Dentistry
https://www.readbyqxmd.com/read/28713427/a-three-year-retrospective-study-on-survival-of-ceramic-veneered-zirconia-y-tzp-fixed-dental-prostheses-performed-in-private-practices
#2
Veronika Norström Saarva, Göran Bjerkstig, Anders Örtorp, Per Svanborg
OBJECTIVES: The aim of this retrospective study was to evaluate the three-year clinical outcome for ceramic-veneered zirconia fixed dental prostheses (FDPs). METHODS: All patients who were treated with ceramic-veneered zirconia FDPs, in three private practices in Sweden, during the period June 2003 to April 2007 were included. Case records from 151 patients, treated with a total of 184 zirconia FDPs (692 units), were analysed for clinical data. All complications noted in the charts were registered and compared to definitions for success and survival and statistical analysis was performed using the Kaplan-Meier method and a Cox regression model...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28710653/mechanical-performance-of-cement-and-screw-retained-all-ceramic-single-crowns-on-dental-implants
#3
Matthias Obermeier, Oliver Ristow, Kurt Erdelt, Florian Beuer
OBJECTIVES: This in-vitro study was performed to compare the contact wear, fracture strength and failure mode of implant-supported all-ceramic single crowns manufactured with various fabrication and fixation concepts. MATERIALS AND METHODS: Fifty dental implants (Conelog Ø 4,3mm/L11mm, Camlog Biotechnologies AG) were embedded and treated with all-ceramic molar single-crowns. Three groups received hand-layered zirconia crowns (IPS e.max Ceram/ IPS e.max ZirCAD, Ivoclar Vivadent AG): CZL (cement-retained zirconia-based layered) group crowns were cemented conventionally, SZL (screw-retained zirconia-based layered) group crowns were screw-retained, MZL (modified zirconia-based layered) group crowns showed a different coping design with screw retention...
July 15, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28709679/the-all-on-4-modified-polyetheretherketone-treatment-approach-a-clinical-report
#4
Panagiotis Zoidis
A modified polyetheretherketone (PEEK) implant framework material in combination with prefabricated high-impact poly(methyl methacrylate) (PMMA) veneers was used as an alternative material for the fabrication of a complete maxillary arch implant-supported fixed restoration. The elastic performance of the PEEK framework (elastic modulus of 4 GPa) combined with PMMA veneers may reduce the occlusal forces, protecting the implant-supported restoration and the opposing dentition, especially in all-on-4 treatments, where lack of proprioception and wide interimplant distance are present...
July 11, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28708920/complications-and-clinical-considerations-of-the-implant-retained-zirconia-complete-arch-prosthesis-with-various-opposing-dentitions
#5
Jorge Gonzalez, Robert G Triplett
PURPOSE: To evaluate the performance of the implant-retained zirconia complete-arch prosthesis with various opposing dentitions. MATERIALS AND METHODS: The 40 patients included in this retrospective case series study were treated with one or two implant-retained zirconia complete-arch prostheses (ZIRCAP) using the Zirkonzahn protocol. Prettau zirconia frames were created with strategic cutbacks in the structure to extend zirconia incisal coverage of the esthetic anterior sextants and complete monolithic zirconia in the molar areas; subsequent layers of porcelain were applied to nonfunctional and esthetic areas...
July 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28697213/mega-abrasion-case-history-report-on-management-of-a-fluorosis-affected-patient
#6
Stefano Ardu
Different approaches ranging from veneers and crowns to employing the more conservative use of freehand resin composites have been proposed to correct esthetic problems caused by enamel fluorosis (EF). However, the protocol of mega-abrasion followed by microabrasion may be used as an alternative. It is less invasive and can minimize the unesthetic brown-to-whitish spots caused by EF. This article describes an easy and low-cost technique for managing enamel defects in a patient with severe enamel fluorosis.
July 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28689909/effects-of-core-and-veneer-thicknesses-on-the-color-of-cad-cam-lithium-disilicate-ceramics
#7
Wol Kang, Jong-Kyoung Park, So-Ri Kim, Woong-Chul Kim, Ji-Hwan Kim
STATEMENT OF PROBLEM: The color of dental ceramics is important for achieving successful esthetic restorations. However, insufficient studies are available of the color of recently introduced computer-aided design-computer-aided manufacturing (CAD-CAM) lithium disilicate ceramics as functions of the core and veneer thicknesses. PURPOSE: The purpose of this in vitro study was to evaluate the effects of the thickness of different core and veneer thicknesses on the color of CAD-CAM lithium disilicate ceramics...
July 6, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28689903/survival-of-2039-complete-arch-fixed-implant-supported-zirconia-prostheses-a-retrospective-study
#8
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/28688487/development-of-an-expert-system-for-the-simulation-model-for-casting-metal-substructure-of-a-metal-ceramic-crown-design
#9
Ivan Matin, Miodrag Hadzistevic, Djordje Vukelic, Michal Potran, Tomaz Brajlih
BACKGROUND AND OBJECTIVES: Nowadays, the integrated CAD/CAE systems are favored solutions for the design of simulation models for casting metal substructures of metal-ceramic crowns. The worldwide authors have used different approaches to solve the problems using an expert system. Despite substantial research progress in the design of experts systems for the simulation model design and manufacturing have insufficiently considered the specifics of casting in dentistry, especially the need for further CAD, RE, CAE for the estimation of casting parameters and the control of the casting machine...
July 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28681501/systematic-development-of-esthetics-and-function-in-a-young-patient-with-maxillary-dental-aplasia
#10
D Edelhoff, O Prandtner, R Saeidi Pour, A Wichelhaus, A Liebermann
OBJECTIVES: Full-arch rehabilitations in young patients suffering from dental agenesis should compensate for the reduced vertical dimension of occlusion and restore both esthetics and function at minimal biological cost. This requires precise planning and maximum patient compliance during the preprosthetic phase. The pretreatment period with tooth-colored splints promotes a predictable outcome of the final restorations. Clinical considerations: Thanks to better restorative materials and adhesive techniques and increased knowledge of how to preserve sound tooth structures, prosthetic dentistry has increasingly turned toward minimally invasive procedures...
July 6, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28681488/endodontic-treatment-of-dens-evaginatus-by-performing-a-splint-guided-access-cavity
#11
Jesús Mena-Álvarez, Cristina Rico-Romano, Ana Belén Lobo-Galindo, Álvaro Zubizarreta-Macho
AIM: Dens evaginatus (DE) is described as an unusual dental malformation. Tooth structure variations attached to this anatomical disturbance complicates the performance of a conservative access cavity for a conventional root canal treatment. Author's purpose is to describe the treatment of a type V DE by using splits as guides to perform access cavity. CLINICAL CONSIDERATIONS: This clinical case shows a root canal treatment of a type V DE diagnosed by using a cone beam computed tomography (CBCT)...
July 6, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28680545/the-effect-of-different-cooling-rates-and-coping-thicknesses-on-the-failure-load-of-zirconia-ceramic-crowns-after-fatigue-loading
#12
Yu Lung Tang, Jee-Hwan Kim, June-Sung Shim, Sunjai Kim
PURPOSE: The purpose of this study was to evaluate the influence of different coping thicknesses and veneer ceramic cooling rates on the failure load of zirconia-ceramic crowns. MATERIALS AND METHODS: Zirconia copings of two different thicknesses (0.5 mm or 1.5 mm; n=20 each) were fabricated from scanning 40 identical abutment models using a dental computer-aided design and computer-aided manufacturing system. Zirconia-ceramic crowns were completed by veneering feldspathic ceramics under different cooling rates (conventional or slow, n=20 each), resulting in 4 different groups (CONV05, SLOW05, CONV15, SLOW15; n=10 per group)...
June 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28675043/effect-of-round-curvature-of-anterior-implant-supported-zirconia-frameworks-finite-element-analysis-and-in-vitro-study-using-digital-image-correlation
#13
Ana Messias, Maria Augusta Neto, Ana Martins Amaro, Pedro Nicolau, Luis Manuel Roseiro
Two groups of 4-unit zirconia frameworks were produced by CAD/CAM to simulate the restoration of an anterior edentulous gap supported by 2 implant-abutment assemblies. Group 1 comprised straight configuration frameworks and group 2 consisted of arched frameworks. Specimens were made with the same connector cross-section area and were cemented and submitted to static loads. Displacements were captured with two high-speed photographic cameras and analysed with video correlation system. Frameworks and the implant-abutment assembly were scanned and converted to 3DCAD objects by reverse engineering process...
July 4, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28662859/monolithic-zirconia-dental-crowns-internal-fit-margin-quality-fracture-mode-and-load-at-fracture
#14
Christian Schriwer, Anneli Skjold, Nils Roar Gjerdet, Marit Øilo
OBJECTIVE: Dental all-ceramic restorations of zirconia, with and without an aesthetic veneering layer, have become a viable alternative to conventional metal-ceramic restorations. The aim of this study was to evaluate whether factors of the production methods or the material compositions affect load at fracture, fracture modes, internal fit or crown margins of monolithic zirconia crowns. METHODS: Sixty crowns made from six different commercially available dental zirconias were produced to a model tooth with a shallow circumferential chamfer preparation...
June 26, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28655478/the-impact-of-argon-oxygen-low-pressure-plasma-on-shear-bond-strength-between-a-veneering-composite-and-different-peek-materials
#15
Andreas Dominik Schwitalla, Friederike Bötel, Tycho Zimmermann, Mona Sütel, Wolf-Dieter Müller
OBJECTIVE: The aim of the study was to evaluate the impact of low-pressure argon/oxygen plasma with and without previous sandblasting on the shear bond strength (SBS) between dental PEEK compounds and a veneering composite. METHODS: Of one type of unfilled PEEK and two pigment powder filled PEEK compounds, forty rectangular plates each were prepared and polished up to 4000 grit. The samples were randomly assigned to four surface pre-treatment groups, each consisting of ten specimens (1...
June 24, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28653051/posterior-indirect-adhesive-%C3%A2-restorations-updated-indications-%C3%A2-and-the-morphology-driven-%C3%A2-preparation-technique
#16
Marco Veneziani
The aim of this article is to identify the indications for adhesively cemented restorations and to provide a correct step-by-step protocol for clinicians. New cavity preparation principles are based on morphological considerations in terms of geometry (maximum profile line and inclination of cusp lines), and structure (dentin concavity and enamel convexity). In this article, we discuss previous preparation concepts that were not designed purely for adhesive restorations and were therefore not conservative enough or suitable for adhesive procedures...
2017: International Journal of Esthetic Dentistry
https://www.readbyqxmd.com/read/28653048/porcelain-veneer-post-bonding-crack-repair-by-resin-infiltration
#17
Marco Gresnigt, Michel Magne, Pascal Magne
Ceramic laminate veneer restorations are indicated in several clinical situations. Indirect restorations are usually chosen if the less-invasive options - bleaching, resin infiltration, or composite resin restorations - are not possible, or when it is too difficult to achieve an esthetically pleasing result in the long term. Bonded indirect partial restorations are highly dependent on their adhesive interface, as these thin restorations have a relatively low cohesive strength. Therefore, preservation of sound enamel, conditioning of the restorations and of the substrate, and luting procedures are of paramount importance for a successful outcome...
2017: International Journal of Esthetic Dentistry
https://www.readbyqxmd.com/read/28653047/noninvasive-bilaminar-cad-cam-composite-resin-veneers-%C3%A2-a-semi-in-direct-approach
#18
Pascal Magne
Direct composite resin restorations have been recognized for their valuable clinical service and respect of intact hard tissue. The cost-effectiveness and inherent minimally invasive approach of resin-based materials means that they are also gaining popularity for use in computer-aided design/computer-aided manufacture (CAD/CAM) procedures. Several cases from the student clinics at the Herman Ostrow School of Dentistry of USC are presented that could have been resolved either with direct composite resin restorations or with indirect porcelain veneers...
2017: International Journal of Esthetic Dentistry
https://www.readbyqxmd.com/read/28647864/bonding-of-composite-resins-to-peek-the-influence-of-adhesive-systems-and-air-abrasion-parameters
#19
Bogna Stawarczyk, Simon Taufall, Malgorzata Roos, Patrick R Schmidlin, Nina Lümkemann
OBJECTIVE: The objective of the study was to investigate the tensile bond strength (TBS) to polyaryletheretherketone (PEEK) after different pretreatment and conditioning methods. METHODS: Four hundred PEEK specimens were fabricated and allocated to the following air-abrasion methods (n 1 = 80/pretreatment): (i) 50 μm Al2O3 (0.05 MPa); (ii) 50 μm Al2O3 (0.35 MPa); (iii) 110 μm Al2O3 (0.05 MPa); (iv) 110 μm Al2O3 (0.35 MPa); and (v) Rocatec 110 μm (0...
June 24, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28647157/veneered-zirconia-inlay-retained-fixed-dental-prostheses-10-year-results-from-a-prospective-clinical-study
#20
Friederike Rathmann, Wolfgang Bömicke, Peter Rammelsberg, Brigitte Ohlmann
OBJECTIVE: The purpose of this study was to evaluate the 10-year clinical performance of zirconia-based inlay-retained fixed dental prostheses (IRFDP). METHODS: For replacement of a molar in 27 patients, 30 IRFDP were luted by use of different cements, Panavia F (Kuraray Europe GmbH) or Multilink Automix (Ivoclar Vivadent GmbH), with use of inlay/inlay, inlay/full-crown, or inlay/partial-crown retainers for anchorage. Frameworks were milled from yttria-stabilized zirconia (IPS e...
June 22, 2017: Journal of Dentistry
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