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Journal of Prosthetic Dentistry

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https://read.qxmd.com/read/30745104/a-cad-cam-device-for-preparing-guide-planes-for-removable-partial-dentures-a-dental-technique
#1
Hyeonjong Lee, Kung-Rock Kwon
To ensure stability and prevent harmful forces, proximal guide planes and those for reciprocation arms should be accurately prepared during mouth preparation for removable partial dentures. A device to guide accurate proximal and reciprocal guide planes was designed and fabricated by using computer-aided design and computer-aided manufacture (CAD-CAM).
February 8, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30745103/effect-of-supporting-substrate-on-the-failure-behavior-of-a-polymer-infiltrated-ceramic-network-material
#2
Júlia Cadorim Facenda, Márcia Borba, Paula Benetti, Alvaro Della Bona, Pedro Henrique Corazza
STATEMENT OF PROBLEM: Restorative materials are cemented on different types of substrates, such as dentin, metal, and glass-fiber posts with composite resin cores. PURPOSE: The purpose of this in vitro study was to evaluate the failure behavior after cycling fatigue of a polymer-infiltrated ceramic network material (PICN; VITA ENAMIC) cemented on different supporting substrates. MATERIAL AND METHODS: PICN plates (N=80) were obtained from computer-assisted design and computer-assisted manufacturing (CAD-CAM) blocks and cemented with a resin cement to 4 different supporting substrates (n=20): (1) human dentin (PICNDen); (2) dentin analog (PICNDenAn); (3) nickel-chromium alloy (PICNNiCr); and (4) composite resin plus fiberglass post (PICNRc)...
February 8, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30745102/radiographic-markers-for-merging-virtual-data-sets
#3
Adam Hamilton, Faris Jamjoom, Simon Doliveux, German O Gallucci, Bernard Friedland
A procedure for registering digital intraoral surface scans onto cone beam computed tomography in the presence of significant scatter artifact is described. The technique uses chairside-fabricated composite resin markers placed on well-distributed teeth to serve as common landmarks in each digital data set for accurate registration. This straightforward, noninvasive, and cost-effective technique facilitates registration without the need for a specialized armamentarium or radiographic templates.
February 8, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30745101/determining-the-retention-of-removable-partial-dentures
#4
Omar Alageel, Ammar A Alsheghri, Suliman Algezani, Eric Caron, Faleh Tamimi
STATEMENT OF PROBLEM: Removable partial dentures (RPDs) provide a cost-effective treatment for millions of partially edentulous patients worldwide. However, they often fail because of loss of retention. One reason for this problem is lack of precise guidelines for designing retentive RPDs. PURPOSE: The purpose of this in vitro study was to determine the forces produced by food and clasps during mastication to develop an algorithm for predicting RPD retention and to help determine the optimal number of clasps...
February 8, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30745100/assessment-of-masticatory-performance-by-geometric-measurement-of-the-mixing-ability-with-2-color-chewing-gum
#5
Yaman Yousof, Nosizana M Salleh, Farazila Yusof
STATEMENT OF PROBLEM: The 2-color mixing ability test has been recently introduced for objective assessment of masticatory performance. However, the ideal bicolor specimens have not yet been identified, and the color analysis of digital images requires improvement. PURPOSE: The purpose of this clinical study was to formulate a custom-made, 2-color chewing gum for the mixing ability test and to develop an image-processing method for color mixing analysis. MATERIAL AND METHODS: Specimens of red-green (RG) chewing gum were prepared as a test food...
February 8, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30732920/a-randomized-controlled-clinical-trial-comparing-guided-with-nonguided-implant-placement-a-3-year-follow-up-of-implant-centered-outcomes
#6
Lauren Bernard, Marjolein Vercruyssen, Joke Duyck, Reinhilde Jacobs, Wim Teughels, Marc Quirynen
STATEMENT OF PROBLEM: Implant-based prosthetic solutions can be time consuming. If implants can be placed successfully with a guide, surgery time can be reduced. PURPOSE: The purpose of this randomized controlled clinical trial was to assess implant outcomes, both clinical and radiological, comparing guided with nonguided implant placement after 3 years of follow-up. MATERIAL AND METHODS: A total of 314 implants were placed in 72 jaws (60 participants)...
February 4, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30711297/effect-of-platform-switching-on-peri-implant-bone-a-3d-finite-element-analysis
#7
Ayesha Aslam, Syed Hammad Hassan, Hammad Mudasser Aslam, Danish Azeem Khan
STATEMENT OF PROBLEM: A consensus regarding the effects of platform switching on peri-implant marginal bone levels is lacking. Finite element studies have reported contradictory results. PURPOSE: The purpose of this finite element analysis study was to evaluate stress distribution in platform-switched (PS) and platform-matched (PM) implants and their surrounding bone. MATERIAL AND METHODS: An implant (4.5×11 mm) was modeled and screwed into a human mandibular bone block using a computer-aided design (CAD) software program...
January 30, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30711296/a-study-of-the-flexural-strength-and-surface-hardness-of-different-materials-and-technologies-for-occlusal-device-fabrication
#8
Vladimir Prpic, Ivan Slacanin, Zdravko Schauperl, Amir Catic, Niksa Dulcic, Samir Cimic
STATEMENT OF PROBLEM: With the emergence of digital technologies, new materials have become available for occlusal devices. However, data are scarce about these different materials and technologies and their mechanical properties. PURPOSE: The purpose of this in vitro study was to investigate the flexural strength and surface hardness of different materials using different technologies for occlusal device fabrication, with an emphasis on the digital technologies of computer-aided design and computer-aided manufacturing (CAD-CAM) and 3D printing...
January 30, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30711295/clinical-outcomes-of-immediately-loaded-implant-supported-overdentures-a-long-term-prospective-clinical-trial
#9
Sara A Alfadda, David Chvartszaid, Abdullah AlFarraj Aldosari
STATEMENT OF PROBLEM: Long-term evidence of immediate loading of dental implants with bar overdentures is lacking. PURPOSE: The purpose of this clinical study was to assess the clinical outcomes of immediate and conventional loading protocols of mandibular overdentures supported by 2 dental implants 14 years after initial placement. MATERIAL AND METHODS: Two groups of edentulous patients who received two TiUnite implants were enrolled in this study...
January 30, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30711294/retention-of-zirconia-copings-over-smooth-and-airborne-particle-abraded-titanium-bases-with-different-resin-cements
#10
Tomas Linkevicius, Audrius Caplikas, Irma Dumbryte, Laura Linkeviciene, Olga Svediene
STATEMENT OF PROBLEM: How cement type and the surface treatment of a titanium base affect the retention of zirconia copings on titanium bases is unclear. PURPOSE: The purpose of this in vitro study was to evaluate the dislodging forces of zirconium oxide copings cemented on implant-supported titanium bases with different luting agents and to examine the influence of airborne-particle abrasion on titanium surfaces. MATERIAL AND METHODS: Thirty implant laboratory analogs (BioHorizons) were fixed in metal blocks, and 30 prosthetic titanium bases (BioHorizons) were tightened with 35 Ncm of torque...
January 30, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30711293/obturator-fabrication-incorporating-computer-aided-design-and-3-dimensional-printing-technology-a-clinical-report
#11
Pooya Soltanzadeh, Jui-Min Su, Shirin Rezvani Habibabadi, Mathew T Kattadiyil
This article reports an approach to fabricating a maxillary obturator using the computer-aided design and computer-aided manufacturing (CAD-CAM) process. The maxillary definitive cast and the trial tooth arrangement were separately scanned and superimposed. The virtual cast created from the scan data was surveyed, and the framework was designed using specific software. The definitive cobalt-chromium framework was fabricated by using 3-dimensional (3D) selective laser sintering (SLS) technology. After framework trial placement, the definitive obturator prosthesis was processed using conventional heat-polymerizing resin with the lost-wax processing technique...
January 30, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30711292/cad-cam-milled-versus-rapidly-prototyped-3d-printed-complete-dentures-an-in-vitro-evaluation-of-trueness
#12
Nicole Kalberer, Albert Mehl, Martin Schimmel, Frauke Müller, Murali Srinivasan
STATEMENT OF PROBLEM: Complete dentures fabricated by computer-aided design and computer-aided manufacturing (CAD-CAM) techniques have become popular. The 2 principal CAD-CAM techniques, milling and rapid prototyping (3D printing), used in the fabrication of complete dentures have been reported to yield clinically acceptable results. However, clinical trials or in vitro studies that evaluated the accuracy of the 2 manufacturing techniques are lacking. PURPOSE: The purpose of this in vitro study was to compare the differences in trueness between the CAD-CAM milled and 3D-printed complete dentures...
January 30, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30711291/influence-of-thermomechanical-fatigue-on-the-fracture-strength-of-cad-cam-fabricated-occlusal-veneers
#13
Majed Al-Akhali, Matthias Kern, Adham Elsayed, Abdulaziz Samran, Mohamed Sad Chaar
STATEMENT OF PROBLEM: With the development of new computer-aided design and computer-aided manufacturing (CAD-CAM) restorative dental materials, limited data regarding their survival rate and fracture strength are available when they are used as occlusal veneers. Therefore, these materials should be evaluated under conditions similar to those of the oral environment before being recommended for clinical use. PURPOSE: To evaluate the influence of thermomechanical fatigue loading on the fracture strength of minimally invasive occlusal veneer restorations fabricated from different CAD-CAM materials and bonded to human maxillary premolars using self-etchnig bonding technique...
January 30, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30711290/evaluation-of-zirconia-surface-roughness-after-aluminum-oxide-airborne-particle-abrasion-and-the-erbium-yag-neodymium-doped-yag-or-co-2-lasers-a-systematic-review-and-meta-analysis
#14
REVIEW
Felipe V Martins, Cláudia T Mattos, Wayne J B Cordeiro, Edgard M Fonseca
STATEMENT OF PROBLEM: Veneer chipping and crown decementation are the most frequent failures in restorations using zirconia as an infrastructure. Increasing the roughness of the zirconia surface has been suggested to address this problem. PURPOSE: The purpose of this systematic review and meta-analysis was to evaluate yttria-stabilized tetragonal zirconia polycrystal surface roughness, produced with aluminum oxide airborne-particle abrasion and the erbium yttrium aluminum garnet (YAG), neodymium-doped YAG, or CO2 lasers...
January 30, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30711289/implant-supported-overdentures-with-different-clinical-configurations-mechanical-resistance-using-a-numerical-approach
#15
Guillermo de la Rosa Castolo, Sonia V Guevara Perez, Pierre-Jean Arnoux, Laurent Badih, Franck Bonnet, Michel Behr
STATEMENT OF PROBLEM: Implant-supported overdentures (IODs) are a treatment option for patients with complete edentulism. However, this treatment increases the possibilities of peri-implant complications, characterized by inflammation or partial loss of surrounding hard and soft tissues. PURPOSE: The purpose of this finite element analysis study was to evaluate the mechanical performance of different bar-IOD designs under different clinical configurations by comparing the stress and strain distribution on the bone during secondary stabilization...
January 30, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30661883/a-fully-digital-approach-to-fabricating-a-cad-cam-ceramic-crown-to-fit-an-existing-removable-partial-denture
#16
Diogo N M Gouveia, Michael E Razzoog, Maria F Alfaro
The use of a fully digital approach to fabricate an anatomic contour crown to fit an existing removable prosthesis allows the dentist and the dental laboratory technician to work efficiently in a digital environment. This report presents a series of patient treatments involving the fabrication of an anatomic contour monolithic zirconia crown to retrofit an existing removable partial denture. A complete digital workflow comprises an intraoral digital scan and computer-aided design and computer-aided manufacturing (CAD-CAM) technology...
January 17, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30661882/ceramic-versus-metal-ceramic-implant-supported-prostheses-a-systematic-review-and-meta-analysis
#17
REVIEW
Cleidiel Aparecido Araújo Lemos, Fellippo Ramos Verri, Jéssica Marcela de Luna Gomes, Victor Eduardo de Souza Batista, Ronaldo Silva Cruz, Hiskell Francine Fernandes E Oliveira, Eduardo Piza Pellizzer
STATEMENT OF PROBLEM: There is insufficient evidence to recommend the restorative material for implant-supported prostheses. PURPOSE: The purpose of this systematic review and meta-analysis was to evaluate studies that compared ceramic and metal-ceramic restorations for implant-supported prostheses (within the same study to avoid indirect comparison) in terms of the mechanical and biological complication rates, prosthesis survival rate, and marginal bone loss. MATERIAL AND METHODS: Two independent reviewers performed a comprehensive search in databases (PubMed/MEDLINE, Web of Science, and Cochrane Library) for articles indexed until March 31, 2018...
January 17, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30661881/accuracy-of-different-definitive-impression-techniques-with-the-all-on-4-protocol
#18
Oguz Ozan, Oguz Hamis
STATEMENT OF PROBLEM: A nonpassive fit of implant-supported restorations can jeopardize the biological and mechanical success of the treatment. Data regarding the fit of different impression techniques for the all-on-4 protocol are limited. PURPOSE: The purpose of this in vitro study was to digitally evaluate 4 different impression techniques used with the all-on-4 protocol, with distal multiunit analogs positioned in 4 different angulations. MATERIAL AND METHODS: Four maxillary definitive cast models with 4 multiunit analogs (T0 32202; NucleOSS) were fabricated according to the all-on-4 treatment protocol...
January 17, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30661880/effect-of-layer-thickness-on-the-marginal-and-internal-adaptation-of-laser-sintered-metal-frameworks
#19
Necati Kaleli, Çağrı Ural, Gözde Özköylü, İbrahim Duran
STATEMENT OF PROBLEM: Laser sintering is commonly used for fabricating metal-ceramic restorations. The layer thickness of the sintering process may affect restoration adaptation. However, limited information is available regarding its impact. PURPOSE: The purpose of this in vitro study was to compare the marginal and internal adaptation of laser-sintered cobalt-chromium single crown frameworks sintered with layer thicknesses of 25 and 50 μm. MATERIAL AND METHODS: Thirty resin dies that represented prepared single molar abutment teeth were prepared by using a 3-dimensional printer and were divided into 3 groups (n=10) according to the method used for fabricating metal frameworks: group C, metal frameworks fabricated by using the lost-wax method (control); group L25, metal frameworks fabricated by using direct metal laser melting with a layer thickness of 25 μm; and group L50, metal frameworks fabricated by using direct metal laser melting with a layer thickness of 50 μm...
January 17, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30661879/adhesive-residue-on-the-cad-cam-surgical-guide-sleeve-a-technical-report
#20
Phillip Roe, Kitichai Rungcharassaeng, Joseph Y Kan, Armand Putra
Computer-aided design and computer-aided manufacturing (CAD-CAM) surgical guides can be used by the clinician and dental technician to create a definitive cast before surgery, thereby allowing an indirect interim restoration to be fabricated. However, the accurate transfer of the interim restoration from the laboratory to the surgical site requires a precise interface between components. This article reports the prosthetic significance of adhesive residue on the intaglio surface of the CAD-CAM surgical guide sleeve, which can create errors in the implant analog position of the definitive cast...
January 17, 2019: Journal of Prosthetic Dentistry
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