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https://www.readbyqxmd.com/read/28527193/comparison-of-digital-intraoral-scanners-by-single-image-capture-system-and-full-color-movie-system
#1
Meguru Yamamoto, Yu Kataoka, Atsufumi Manabe
BACKGROUND: The use of dental computer-aided design/computer-aided manufacturing (CAD/CAM) restoration is rapidly increasing. OBJECTIVE: This study was performed to evaluate the marginal and internal cement thickness and the adhesive gap of internal cavities comprising CAD/CAM materials using two digital impression acquisition methods and micro-computed tomography. METHODS: Images obtained by a single-image acquisition system (Bluecam Ver...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28527036/osteogenesis-ability-of-cad-cam-porous-zirconia-scaffolds-enriched-with-nano-hydroxyapatite-particles
#2
Moustafa N Aboushelib, Rehab Shawky
BACKGROUND: The aim of this study was to evaluate osteogenesis ability of CAD/CAM porous zirconia scaffolds enriched with hydroxy apatite used to augment large boney defects in a dog model. METHODS: Surgical defects were made bilaterally on the lower jaw of 12 Beagle dogs. Cone beam CT images were used to create three dimensional images of the healed defects. Porous zirconia scaffolds were fabricated by milling custom made CAD/CAM blocks into the desired shape. After sintering, the pores of half of the scaffolds were filled with a nano-hydroxy apatite (HA) powder while the other half served as control...
December 2017: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/28526443/mechanical-properties-of-polymer-infiltrated-ceramic-sodium-aluminum-silicate-composites-for-dental-restoration
#3
Bencang Cui, Jing Li, Huining Wang, Yuanhua Lin, Yang Shen, Ming Li, Xuliang Deng, Cewen Nan
OBJECTIVE: To fabricate indirect restorative composites for CAD/CAM applications and evaluate the mechanical properties. METHODS: Polymer-infiltrated-ceramic composites were prepared through infiltrating polymer into partially sintered sodium aluminum silicate ceramic blocks and curing. The corresponding samples were fabricated according to standard ISO-4049 using for mechanical properties measurement. The flexural strength and fracture toughness were measured using a mechanical property testing machine...
May 16, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28526429/use-of-a-cad-cam-poly-methyl-methacrylate-interim-prosthesis-for-direct-intraoral-splinting
#4
Periklis Proussaefs
This article describes a technique where an interim computer-aided design and computer-aided manufacturing (CAD-CAM) prosthesis is milled from a poly(methyl methacrylate) blank to confirm esthetics, occlusion, function, phonetics, and accessibility for oral hygiene. The interim prosthesis is then sectioned and reconnected intraorally with autopolymerizing acrylic resin. This interim prosthesis is used to fabricate the definitive stone cast. The interim prosthesis is then scanned with a laboratory scanner. By applying this technique, the implant positioning can be related to the occlusal plane, the contours of the teeth, and the flange...
May 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28514349/-elastic-properties-and-porosity-of-dental-blocks-made-from-non-metal-materials-used-for-chairside-cad-cam-crowns
#5
K E Goryainova, E S Morokov, M V Retinskaya, I J Lebedenko
Elastic properties and internal structure of glass-ceramic, feldspatic ceramic, PMMA and hybrid blocks for chairside CAD/CAM dental crowns were assessed by pulsed acoustic microscopy. Elastic modulus of hybrid ceramic was 1.5 times inferior to feldspatic ceramic and glass-ceramic but almost 10 times higher than those of polymer samples. We found the presence of pores from a few to hundreds of microns in the bulk of inorganic materials samples, isolated point defects were revealed in polymer materials while in hybrid material defects were not found...
2017: Stomatologii︠a︡
https://www.readbyqxmd.com/read/28514042/effect-of-crystallization-firing-on-marginal-gap-of-cad-cam-fabricated-lithium-disilicate-crowns
#6
Steven A Gold, Jack L Ferracane, Juliana da Costa
PURPOSE: To evaluate the marginal gaps of CAD/CAM (CEREC 3) produced crowns made from leucite-reinforced glass-ceramic (IPS Empress CAD) blocks (LG), and lithium-disilicate (IPS e.max CAD) blocks before (LD-B), and after (LD-A) crystallization firing. MATERIALS AND METHODS: A human molar tooth (#19) was mounted with adjacent teeth on a typodont and prepared for a full-coverage ceramic crown. The typodont was assembled in the mannequin head to simulate clinical conditions...
May 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28513217/a-preliminary-study-on-the-effect-of-computer-aided-designed-and-manufactured-orthoses-on-chronic-plantar-heel-pain
#7
Alfred Gatt, Mark Grech, Nachiappan Chockalingam, Cynthia Formosa
INTRODUCTION: Chronic plantar heel pain (CPHP) is a significant, painful condition referring to a range of undifferentiated foot conditions that affect the heel of the foot. METHOD: Participants presenting with CPHP of more than 6 months' duration were recruited on a first through the door basis. Computer-Aided Design and Computer-Aided Manufactured (CAD-CAM) orthoses were designed and constructed for each participant, then dispensed as per normal practice. Pre- and postintervention assessment of pain was performed at baseline and after 6 weeks of use, utilizing the pain subset of the Foot Function Index (FFI)...
May 1, 2017: Foot & Ankle Specialist
https://www.readbyqxmd.com/read/28507870/intraoperative-change-in-defect-size-during-maxillary-reconstruction-using-surgical-guides-created-by-cad-cam
#8
Daiki Morita, Toshiaki Numajiri, Hiroko Nakamura, Shoko Tsujiko, Yoshihiro Sowa, Makoto Yasuda, Shigeru Hirano
Surgical osteotomy guides created by computer-aided design/computer-aided manufacturing (CAD/CAM) have been developed and are now widely used in maxillofacial reconstruction. However, there are no standard procedures for dealing with an intraoperative change in defect size. We report on a case in which we used our CAD/CAM guides to deal with an intraoperative change in defect size in a maxillary reconstruction. We planned the maxillary reconstruction using a free fibula flap because of left maxillary sinus cancer in a 73-year-old man...
April 2017: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/28507636/influence-of-number-of-implants-and-attachment-type-on-stress-distribution-in-mandibular-implant-retained-overdentures-finite-element-analysis
#9
Mohamed I El-Anwar, Eman A El-Taftazany, Hamdy A Hamed, Mohamed A Abd ElHay
AIM: This study aimed to compare the stresses generated by using two or four root form dental implants supporting mandibular overdentures that were retained with ball and locator attachments. METHODS: Under ANSYS environment, four 3D finite element models were prepared. These models simulated complete overdentures supported by two or four implants with either ball or locator attachments as a connection mechanism. The models' components were created by CAD/CAM package then were imported to ANSYS...
April 15, 2017: Open Access Macedonian Journal of Medical Sciences
https://www.readbyqxmd.com/read/28506652/comparison-of-denture-tooth-movement-between-cad-cam-and-conventional-fabrication-techniques
#10
Brian J Goodacre, Charles J Goodacre, Nadim Z Baba, Mathew T Kattadiyil
STATEMENT OF PROBLEM: Data comparing the denture tooth movement of computer-aided design and computer-aided manufacturing (CAD-CAM) and conventional denture processing techniques are lacking. PURPOSE: The purpose of this in vitro study was to compare the denture tooth movement of pack-and-press, fluid resin, injection, CAD-CAM-bonded, and CAD-CAM monolithic techniques for fabricating dentures to determine which process produces the most accurate and reproducible prosthesis...
May 12, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28506651/a-load-to-fracture-and-strain-analysis-of-monolithic-zirconia-cantilevered-frameworks
#11
Faris A Alshahrani, Burak Yilmaz, Jeremy D Seidt, Edwin A McGlumphy, William A Brantley
STATEMENT OF PROBLEM: The dimensions of implant-supported fixed cantilevered prostheses are important to prevent mechanical and biological complications. Information on the optimum thickness and cantilever length for improving the strength of zirconia cantilevered frameworks is limited in the literature. PURPOSE: The purpose of this in vitro study was to investigate the effect of cantilever length and occlusocervical thickness on the load-to-fracture and strain distribution of zirconia frameworks...
May 12, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28496253/survey-on-the-use-of-cad-cam-technology-by-uk-and-irish-dental-technicians
#12
E Blackwell, M Nesbit, H Petridis
Statement of the problem Digital workflows (CAD/CAM) have been introduced in dentistry during recent years. No published information exists on dental technicians' use and reporting of this technology.Purpose The aim of this cross sectional survey was to identify the extent digital technology has infiltrated the workplace and to investigate the factors affecting the use of CAD-CAM technology by dental laboratory technicians within Ireland and the UK.Materials and methods A web-based questionnaire was composed (Opinio, Object Planet Inc...
May 12, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28494041/innovative-single-tooth-replacement-with-an-individual-root-analog-hybrid-implant-in-the-esthetic-zone-case-report
#13
Reza Saeidi Pour, Peter Randelzhofer, Daniel Edelhoff, Otto Prandtner, Caroline Freitas Rafael, Anja Liebermann
The goal of this study was to explore an innovative approach to single-tooth replacement using an individually custom-fabricated, root-analog, hybrid dental implant, in the esthetic zone, to avoid the microgap and micromovements between the implant and abutment. Moreover, the use of burs to prepare the implant recipient site is not necessary in this technique, reducing the bone removal, heating, and trauma. The process requires capturing accurate root geometry through combined computer-aided design/computer-assisted manufacturing (CAD/CAM) and a three-dimensional (3D) visualization (digital volume tomography [DVT]) of the tooth in situ, which might result in reduced remodeling after insertion...
May 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28483229/use-of-three-dimensional-cad-cam-assisted-virtual-surgical-simulation-and-planning-in-the-pediatric-craniofacial-population
#14
Rachel Gray, Alexander Gougoutas, Vinh Nguyen, Jesse Taylor, Nicholas Bastidas
OBJECTIVE: Virtual Surgical Planning (VSP) and computer-aided design/computer-aided manufacturing (CAD/CAM) have recently helped improve efficiency and accuracy in many different craniofacial surgeries. Research has mainly focused on the use in the adult population with the exception of the use for mandibular distractions and cranial vault remodeling in the pediatric population. This study aims to elucidate the role of VSP and CAD/CAM in complex pediatric craniofacial cases by exploring its use in the correction of midface hypoplasia, orbital dystopia, mandibular reconstruction, and posterior cranial vault expansion...
June 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28478991/comparison-of-3d-displacements-of-screw-retained-zirconia-implant-crowns-into-implants-with-different-internal-connections-with-respect-to-screw-tightening
#15
Hanadi A Rebeeah, Burak Yilmaz, Jeremy D Seidt, Edwin McGlumphy, Nancy Clelland, William Brantley
STATEMENT OF PROBLEM: Internal conical implant-abutment connections without horizontal platforms may lead to crown displacement during screw tightening and torque application. This displacement may affect the proximal contacts and occlusion of the definitive prosthesis. PURPOSE: The purpose of this in vitro study was to evaluate the displacement of custom screw-retained zirconia single crowns into a recently introduced internal conical seal implant-abutment connection in 3D during hand and torque driver screw tightening...
May 5, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28469824/traction-test-of-temporary-dental-cements
#16
Juan-Luis Román-Rodríguez, Diego Millan-Martínez, Antonio Fons-Font, Rubén Agustín-Panadero, Lucía Fernández-Estevan
BACKGROUND: Classic self-curing temporary cements obstruct the translucence of provisional restorations. New dual-cure esthetic temporary cements need investigation and comparison with classic cements to ensure that they are equally retentive and provide adequate translucence. The objective is to analyze by means of traction testing in a in vitro study the retention of five temporary cements. MATERIAL AND METHODS: Ten molars were prepared and ten provisional resin restorations were fabricated using CAD-CAM technology (n=10)...
April 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28466248/comparative-evaluation-of-the-stability-of-two-different-dental-implant-designs-and-surgical-protocols-a-pilot-study
#17
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/28463621/computer-aided-design-computer-aided-manufacturing-skull-base-drill
#18
William T Couldwell, Joel D MacDonald, Charles L Thomas, Bradley C Hansen, Aniruddha Lapalikar, Bharat Thakkar, Alagar K Balaji
The authors have developed a simple device for computer-aided design/computer-aided manufacturing (CAD-CAM) that uses an image-guided system to define a cutting tool path that is shared with a surgical machining system for drilling bone. Information from 2D images (obtained via CT and MRI) is transmitted to a processor that produces a 3D image. The processor generates code defining an optimized cutting tool path, which is sent to a surgical machining system that can drill the desired portion of bone. This tool has applications for bone removal in both cranial and spine neurosurgical approaches...
May 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28462405/monolithic-zirconia-reconstructions-supported-by-teeth-and-implants-1-to-3-year-results-of-a-case-series
#19
Andreas Worni, Joannis Katsoulis, Lumni Kolgeci, Mathias Worni, Regina Mericske-Stern
OBJECTIVE: Today, only scarce information is available on monolithic zirconia reconstructions. The objective of this study was to evaluate the performance of monolithic zirconia for tooth- and implant-borne reconstructions. METHOD AND MATERIALS: Monolithic zirconia single crowns (SCs) and fixed dental prostheses (FDPs) supported by implants or teeth were included in this study. Implant placement and prosthetic treatment were done in the same clinical setting. One technician performed all laboratory work using the same CAD/CAM workflow (DentalDesigner, Ceramill Motion 2, Amann Girrbach)...
April 28, 2017: Quintessence International
https://www.readbyqxmd.com/read/28461637/dental-students-perceptions-of-digital-assessment-software-for-preclinical-tooth-preparation-exercises
#20
Carly F Park, Justin M Sheinbaum, Yasushi Tamada, Raina Chandiramani, Lisa Lian, Cliff Lee, John Da Silva, Shigemi Ishikawa-Nagai
Objective self-assessment is essential to learning and continued competence in dentistry. A computer-assisted design/computer-assisted manufacturing (CAD/CAM) learning software (prepCheck, Sirona) allows students to objectively assess their performance in preclinical prosthodontics. The aim of this study was to evaluate students' perceptions of CAD/CAM learning software for preclinical prosthodontics exercises. In 2014, all third-year dental students at Harvard School of Dental Medicine (n=36) were individually instructed by a trained faculty member in using prepCheck...
May 2017: Journal of Dental Education
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