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https://www.readbyqxmd.com/read/28424734/influence-of-teeth-preparation-finishing-on-the-adaptation-of-lithium-disilicate-crowns
#1
Bruna Salamoni Sinhori, Mauro Amaral Caldeira de Andrada, Guilherme Carpena Lopes, Sylvio Monteiro Junior, Luiz Narciso Baratieri
The polishing step of teeth preparations for crowns is a step often performed, so that there is an increased time during the clinical procedure. The aim of this study is to evaluate the marginal and internal adaptation of all-ceramic CAD/CAM lithium disilicate crowns in polished preparations for crown and nonpolished preparations for crowns. For this purpose, 20 first molars were selected, which were divided into two groups (n = 10) G1, teeth that received surface roughening similar to preparation without polishing, and G2 (control), polished preparations...
2017: International Journal of Biomaterials
https://www.readbyqxmd.com/read/28422359/clinical-evaluation-of-indirect-particle-filled-composite-resin-cad-cam-partial-crowns-after-24-months
#2
Moritz Zimmermann, Christina Koller, Marcel Reymus, Albert Mehl, Reinhard Hickel
PURPOSE: Resin-based CAD/CAM compound materials might be promising for single-tooth restorations. Insufficient clinical data are available for this new material class. The purpose of this study was to describe initial clinical in vivo results for indirect particle-filled composite resin CAD/CAM restorations after 24 months. MATERIALS AND METHODS: Indirect particle-filled composite resin restorations were fabricated with a CAD/CAM method (CEREC Bluecam intraoral scanner, CEREC MCXL milling unit) by calibrated dental students...
April 19, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28420488/mandibular-step-osteotomy-using-cad-cam-derived-surgical-splint-case-report
#3
J W Huh, Y B Lee, Y S Jung, H D Jung
Mandibular step osteotomy is a useful technique for large mandibular setbacks. We report a case of a patient who had a mandibular step osteotomy using a CAD/CAM-derived wafer for mandibular setback with reduction of the arch.
April 15, 2017: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/28419844/triple-cut-computer-aided-design-computer-aided-modeling-more-oncologic-safety-added-to-precise-mandible-modeling
#4
Vittorio Ramella, Alberto Franchi, Stefano Bottosso, Giancarlo Tirelli, Federico Cesare Novati, Zoran Marij Arnež
PURPOSE: Computer-aided design-computer-aided modeling (CAD-CAM) has become standard in mandibular reconstruction because it offers better outcomes. Occasionally, the reconstructive plans need to be changed intraoperatively and the custom-made prefabricated devices may become inadequate. We present an efficient adjunct to the standard CAD-CAM technique that resolves this problem. MATERIALS AND METHODS: Customized surgical devices with our "triple-cut" concept were used in 5 patients for mandibular reconstruction with free fibula flap (4 after mandibular resection for squamous cell carcinoma and 1 after mandibular osteoradionecrosis)...
March 24, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28413589/the-color-masking-ability-of-a-zirconia-ceramic-on-the-substrates-with-different-values
#5
Farhad Tabatabaian, Mahdiye Javadi Sharif, Farhood Massoumi, Mahshid Namdari
Background. The color masking ability of a restoration plays a significant role in coveringa discolored substructure; however, this optical property of zirconia ceramics has not been clearly determined yet. The aim of this in vitro study was to evaluate the color masking ability of a zirconia ceramic on substrates with different values. Methods. Ten zirconia disk specimens,0.5 mm in thickness and 10 mm in diameter, were fabricated by a CAD/CAM system. Four substrates with different values were prepared, including: white (control), light grey, dark grey, and black...
2017: Journal of Dental Research, Dental Clinics, Dental Prospects
https://www.readbyqxmd.com/read/28413061/mechanical-behavior-of-bulk-direct-composite-versus-block-composite-and-lithium-disilicate-indirect-class-ii-restorations-by-cad-fem-modeling
#6
Pietro Ausiello, Stefano Ciaramella, Andrea Fabianelli, Antonio Gloria, Massimo Martorelli, Antonio Lanzotti, David C Watts
OBJECTIVES: To study the influence of resin based and lithium disilicate materials on the stress and strain distributions in adhesive class II mesio-occlusal-distal (MOD) restorations using numerical finite element analysis (FEA). To investigate the materials combinations in the restored teeth during mastication and their ability to relieve stresses. METHODS: One 3D model of a sound lower molar and three 3D class II MOD cavity models with 95° cavity-margin-angle shapes were modelled...
April 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28408058/security-high-tech-individual-extra-light-device-mask-2-0-cad-cam-evolution
#7
V Ramieri, V Vellone, S Crimi, P Cascone
In 2008, we presented our security "high-tech" individual extra-light device mask (SHIELD), a protective shield based on the face cast of an injured soccer player that can be customised. It allows a shortened convalescent period, is comfortable, fits well, and allows the patient to continue to play at a professional level in their chosen sport or activity in the shortest time possible. It has been used often in both amateur and professional categories of many sports, and we now present an update.
April 10, 2017: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/28407306/the-influence-of-the-emergence-profile-on-the-amount-of-undetected-cement-excess-after-delivery-of-cement-retained-implant-reconstructions
#8
M Sancho-Puchades, D Crameri, M Özcan, I Sailer, R E Jung, C H F Hämmerle, D S Thoma
OBJECTIVE: To test whether or not one of two emergence profile designs (concave or convex) is superior to the other in terms of remaining cement following cementation of reconstructions on individualized abutments and careful cement removal. MATERIALS AND METHODS: A central incisor with a single implant-supported reconstruction was selected as a model. Six types of abutments (n = 10) with two different emergence profile designs (concave (CC) and convex (CV)) and three crown-abutment margin depths (epimucosal, 1...
April 13, 2017: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/28403134/early-computer-aided-design-computer-aided-modeling-planned-le-fort-i-advancement-with-internal-distractors-to-treat-severe-maxillary-hypoplasia-in-cleft-lip-and-palate
#9
Catherine S Chang, Jordan Swanson, Jason Yu, Jesse A Taylor
Traditionally, maxillary hypoplasia in the setting of cleft lip and palate is treated via orthognathic surgery at skeletal maturity, which condemns these patients to abnormal facial proportions during adolescence. The authors sought to determine the safety profile of computer-aided design/computer-aided modeling (CAD/CAM) planned, Le Fort I distraction osteogenesis with internal distractors in select patients presenting at a young age with severe maxillary retrusion. The authors retrospectively reviewed our "early" Le Fort I distraction osteogenesis experience-patients performed for severe maxillary retrusion (≥12 mm underjet), after canine eruption but prior to skeletal maturity-at a single institution...
April 11, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28402734/masking-colored-substrates-using-monolithic-and-bilayer-cad-cam-ceramic-structures
#10
G R Basso, A B Kodama, A H Pimentel, M R Kaizer, A Della Bona, R R Moraes, N Boscato
OBJECTIVE: To evaluate the masking ability and translucency of monolithic and bilayer CAD-CAM ceramic structures. METHODS: Discs of high translucency (HT) and low translucency (LT) lithium disilicate-based ceramic (IPS e.max CAD) with different thicknesses (0.7, 1, 1.5, and 2 mm) were evaluated as a monolithic structure or combined (bilayer) with a 0.5-mm-thick zirconia framework (IPS e.max ZirCAD). The masking ability and translucency were calculated based on CIE L*a*b* color coordinates measured with a spectrophotometer (SP60, X-Rite)...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28396807/fabricating-cad-cam-implant-retained-mandibular-bar-overdentures-a-clinical-and-technical-overview
#11
Chui Ling Goo, Keson Beng Choon Tan
This report describes the clinical and technical aspects in the oral rehabilitation of an edentulous patient with knife-edge ridge at the mandibular anterior edentulous region, using implant-retained overdentures. The application of computer-aided design and computer-aided manufacturing (CAD/CAM) in the fabrication of the overdenture framework simplifies the laboratory process of the implant prostheses. The Nobel Procera CAD/CAM System was utilised to produce a lightweight titanium overdenture bar with locator attachments...
2017: Case Reports in Dentistry
https://www.readbyqxmd.com/read/28392819/computer-based-technologies-in-dentistry-types-and-applications
#12
REVIEW
Raja'a M Albuha Al-Mussawi, Farzaneh Farid
During dental education, dental students learn how to examine patients, make diagnosis, plan treatment and perform dental procedures perfectly and efficiently. However, progresses in computer-based technologies including virtual reality (VR) simulators, augmented reality (AR) and computer aided design/computer aided manufacturing (CAD/CAM) systems have resulted in new modalities for instruction and practice of dentistry. Virtual reality dental simulators enable repeated, objective and assessable practice in various controlled situations...
June 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28387166/multi-scale-analysis-of-the-effect-of-nano-filler-particle-diameter-on-the-physical-properties-of-cad-cam-composite-resin-blocks
#13
Satoshi Yamaguchi, Sayuri Inoue, Takahiko Sakai, Tomohiro Abe, Haruaki Kitagawa, Satoshi Imazato
The objective of this study was to assess the effect of silica nano-filler particle diameters in a computer-aided design/manufacturing (CAD/CAM) composite resin (CR) block on physical properties at the multi-scale in silico. CAD/CAM CR blocks were modeled, consisting of silica nano-filler particles (20, 40, 60, 80, and 100 nm) and matrix (Bis-GMA/TEGDMA), with filler volume contents of 55.161%. Calculation of Young's moduli and Poisson's ratios for the block at macro-scale were analyzed by homogenization. Macro-scale CAD/CAM CR blocks (3 × 3 × 3 mm) were modeled and compressive strengths were defined when the fracture loads exceeded 6075 N...
May 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28385435/effect-of-repeated-ceramic-firings-on-the-marginal-and-internal-adaptation-of-metal-ceramic-restorations-fabricated-with-different-cad-cam-technologies
#14
Hasan Kocaağaoğlu, Haydar Albayrak, Halil Ibrahim Kilinc, Hasan Önder Gümüs
STATEMENT OF PROBLEM: The use of computer-aided design and computer-aided manufacturing (CAD-CAM) for metal ceramic restorations has increased with advances in the technology. However, little is known about the marginal and internal adaptation of restorations fabricated using laser sintering (LS) and soft milling (SM). Moreover, the effects of repeated ceramic firings on the marginal and internal adaptation of metal ceramic restorations fabricated with LS and SM is also unknown. PURPOSE: The purpose of this in vitro study was to investigate the effects of repeated ceramic firings on the marginal and internal adaptation of metal ceramic copings fabricated using the lost wax (LW), LS, and SM techniques...
April 3, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28385434/computer-aided-analysis-of-digital-dental-impressions-obtained-from-intraoral-and-extraoral-scanners
#15
Lauren Oliveira Lima Bohner, Graziela De Luca Canto, Bruno Silva Marció, Dalva Cruz Laganá, Newton Sesma, Pedro Tortamano Neto
STATEMENT OF PROBLEM: The internal and marginal adaptation of a computer-aided design and computer-aided manufacturing (CAD-CAM) prosthesis relies on the quality of the 3-dimensional image. The quality of imaging systems requires evaluation. PURPOSE: The purpose of this in vitro study was to evaluate and compare the trueness of intraoral and extraoral scanners in scanning-prepared teeth. MATERIAL AND METHODS: Ten acrylic resin teeth to be used as a reference dataset were prepared according to standard guidelines and scanned with an industrial computed tomography system...
April 3, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28384989/application-of-cad-cam-for-fabrication-of-metal-free-band-and-loop-space-maintainer
#16
Harleen Kaur Soni
An ideal occlusion with proper tooth alignment and fully functional teeth is the ultimate goal of all dental treatments. Premature extraction of deciduous teeth is a common sequeale of untreated dental caries in teeth in which the damage is far beyond repair. Premature extraction might lead to loss of space for the successor tooth, drifting of teeth and loss of arch integrity leading to malocclusion in the permanent teeth. To prevent the space loss, space maintainers are designed and delivered at the time of extraction to allow for development of proper functional occlusion in children till the eruption of the succedaneous permanent tooth...
February 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28382922/laser-direct-write-based-fabrication-of-a-spatially-defined-biomimetic-construct-as-a-potential-model-for-breast-cancer-cell-invasion-into-adipose-tissue
#17
Benjamin Tyler Vinson, Theresa Phamduy, Josh Shipman, Brian Riggs, Amy Strong, Walter Murfee, Matthew Burow, Bruce Bunnell, Samuel Sklare, Yong Huang, Douglas Chrisey
Epithelial-adipose interaction is an integral step in breast cancer cell invasion and progression towards lethal metastatic disease.  Understanding the physiological contribution of obesity, a major contributor to breast cancer risk and negative prognosis in post-menopausal patients, on cancer cell invasion requires detailed co-culture constructs that reflect mammary microarchitecture.  Using laser direct-write, a laser-based CAD/CAM bioprinting technique, we have demonstrated the ability to construct breast cancer cell-laden hydrogel microbeads into spatially defined patterns in hydrogel matrices containing differentiated adipocytes...
April 6, 2017: Biofabrication
https://www.readbyqxmd.com/read/28381373/the-use-of-patient-specific-implants-in-orthognathic-surgery-a-series-of-30-mandible-sagittal-split-osteotomy-patients
#18
Juho Suojanen, Junnu Leikola, Patricia Stoor
PURPOSE: Virtual surgery combined with patient-specific saw and drill guides and osteosynthesis materials are rapidly spreading from reconstructive surgery to orthognathic surgery. Most commercial partners are already providing computer-aided design and computer-aided manufacture (CAD/CAM) wafers and patient-specific saw guides. Clear benefits have been demonstrated for custom-made drill guides combined with individually designed three-dimensional (3D) printed patient-specific implants (PSI) as a reposition and fixation system in Le Fort I osteotomy...
March 3, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28367913/impact-of-background-on-color-transmittance-and-fluorescence-of-leucite-based-ceramics
#19
Caroline Freitas Rafael, Jan-Frederik Güth, Ana Elisa Colle Kauling, Paulo Francisco Cesar, Claudia Angelo Mazieiro Volpato, Anja Liebermann
This study evaluated the impact of tooth shade on differences in color (∆E), lightness (∆L), chromaticity coordinates a*/b* (∆a and ∆b), transmittance and the degree of fluorescence of CAD/CAM leucite based ceramic (LBC). Ten disks were fabricated of LBC; Empress CAD, A2, thickness of 1.5 mm and eight disks of resin-nano-ceramic (RNC; Lava Ultimate) in different colors to simulate variations in substrate shade. The associations of LBC disks with different color substrates were analyzed with a spectrophotometer; ∆E, ∆L*, ∆a*, ∆b*, and transmittance were measured and calculated...
March 29, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28367911/sem-evaluation-of-the-precision-of-fit-of-cad-cam-zirconia-and-metal-ceramic-posterior-crowns
#20
Rocio Ortega, Esther Gonzalo, Miguel Gomez-Polo, Carlos Lopez-Suarez, Maria J Suarez
The purpose of this study is to evaluate the precision of fit of posterior crowns made from three commercial CAD/CAM zirconia ceramics and conventional metal-ceramic technique. The external and internal marginal fit of the crowns was evaluated using direct SEM-based measurements. The data were subjected to Kruskal-Wallis, multicomparison post hoc analysis and Wilcoxon rank sum tests (α=0.05). Significant differences were observed for the external (p<0.002) and the internal (p<0.0001) marginal evaluation among the groups...
March 29, 2017: Dental Materials Journal
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