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https://www.readbyqxmd.com/read/28645068/fracture-roughness-and-phase-transformation-in-cad-cam-milling-and-subsequent-surface-treatments-of-lithium-metasilicate-disilicate-glass-ceramics
#1
Abdur-Rasheed Alao, Richard Stoll, Xiao-Fei Song, John R Abbott, Yu Zhang, Jaafar Abduo, Ling Yin
This paper studied surface fracture, roughness and morphology, phase transformations, and material removal mechanisms of lithium metasilicate/disilicate glass ceramics (LMGC/LDGC) in CAD/CAM-milling and subsequent surface treatments. LMGC (IPS e.max CAD) blocks were milled using a chairside dental CAD/CAM milling unit and then treated in sintering, polishing and glazing processes. X-ray diffraction was performed on all processed surfaces. Scanning electron microscopy (SEM) was applied to analyse surface fracture and morphology...
June 15, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28644556/sinus-augmentation-using-a-mini-pig-model-effect-of-ceramic-and-allogeneic-bone-biomaterials
#2
Cristiano Susin, Tiago Fiorini, Jaebum Lee, Rubens Moreno de Freitas, Hsien-Chung Chiu, Hari S Prasad, Amanda N Buxton, Ulf Me Wikesjö
BACKGROUND: Present clinical practice broadly relies on off-the-shelf allogeneic, xenogeneic or synthetic bone biomaterials in support of sinus augmentation. Also, recombinant human bone morphogenetic protein-2 in an absorbable collagen sponge carrier (rhBMP-2/ACS) has been shown to support clinically relevant bone formation when used to augment the maxillary sinus. OBJECTIVES: To evaluate local bone formation/dental implant osseointegration following implantation of two particulate bone biomaterials using the mini-pig sinus augmentation model...
June 23, 2017: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/28642930/a-novel-etching-technique-for-surface-treatment-of-zirconia-ceramics-to-improve-adhesion-of-resin-based-luting-cements
#3
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/28642911/a-retrospective-multicenter-study-comparing-metal-ceramic-and-composite-single-crowns-performed-in-public-general-dentistry-5-year-results
#4
Jennie Overmeer, Birger Narby, Lars Hjalmarsson, Kristina Arnrup, Alf Eliasson
Objective The aim of this study was to evaluate and compare the 5-year survival and complication rate of metal-ceramic (MC) and composite single crowns performed within Public Dental Service, general dentistry, in three Swedish counties and with patients' gender, tooth position, root canal treatment and the presence of a post-and-core taken into account. Methods Data were collected from dental records of 600 patients who had received either an MC (n = 300) or a composite (n = 300) crown on a premolar or molar tooth in the year 2005 and where 5 years of follow-up data were available...
December 2016: Acta Biomaterialia Odontologica Scandinavica
https://www.readbyqxmd.com/read/28638554/effect-of-professional-dental-prophylaxis-on-the-surface-gloss-and-roughness-of-cad-cam-restorative-materials
#5
Toshiko Sugiyama, Atsushi Kameyama, Tomoka Enokuchi, Akiko Haruyama, Aoi Chiba, Setsuko Sugiyama, Makoto Hosaka, Toshiyuki Takahashi
BACKGROUND: This study aimed to evaluate the effect of dental prophylaxis on the surface gloss and roughness of different indirect restorative materials for computer-aided design/computer-aided manufacturing (CAD/CAM): two types of CAD/CAM composite resin blocks (Shofu Block HC and Estelite Block) and two types of CAD/CAM ceramic blocks (IPS Empress CAD and Celtra DUO). MATERIAL AND METHODS: After polishing the CAD/CAM blocks and applying prophylaxis pastes, professional dental prophylaxis was performed using four different experimental protocols (n = 5 each): mechanical cleaning with Merssage Regular for 10 s four times (Group 1); four cycles of mechanical cleaning with Merssage Regular for 10 s and Merssage Fine for 10 s (Group 2); four cycles of mechanical cleaning with Merssage Regular for 10 s and Merssage Fine for 30 s (Group 3); and mechanical cleaning with Merssage Fine for 10 s four times (Group 4)...
June 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28633093/fracture-resistance-of-ceramic-and-polymer-based-occlusal-veneer-restorations
#6
Majed Al-Akhali, Mohamed Sad Chaar, Adham Elsayed, Abdulaziz Samran, Matthias Kern
OBJECTIVES: The purpose of this in vitro study was to evaluate the influence of thermodynamic loading on the durability and fracture resistance behavior of occlusal veneers fabricated from different biomedical dental CAD/CAM materials. METHODS: The occlusal surfaces of 64 extracted premolars were prepared in the enamel layer and restored with occlusal veneers with a fissure/cusp thickness of 0.5/0.8mm made from four different dental CAD/CAM materials: group LD lithium disilicate (e...
June 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28630960/a-new-milling-machine-for-computer-aided-in-office-restorations
#7
Andreas Kurbad
Chairside computer-aided design/computer-aided manufacturing (CAD/CAM) technology requires an effective technical basis to obtain dental restorations with optimal marginal accuracy, esthetics, and longevity in as short a timeframe as possible. This article describes a compact, 5-axis milling machine based on an innovative milling technology (5XT - five-axis turn-milling technique), which is capable of achieving high-precision milling results within a very short processing time. Furthermore, the device's compact dimensioning and state-of-the-art mode of operation facilitate its use in the dental office...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/28630955/chairside-systems-a-current-review
#8
Markus Zaruba, Albert Mehl
Since Cerec (Chairside Economical Restoration of Esthetic Ceramics) was introduced as the first dental chairside computer-aided design/computer-aided manufacturing (CAD/CAM) system in the mid-1980s, this technology has enjoyed growing popularity, particularly in the recent past. There has been a considerable increase in the number of available chairside systems in only the last few years. One of the main reasons for this is that intraoral scanners have become increasingly better, smaller, and faster, while the design software has become more and more user-friendly...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/28616826/deposition-of-crystalline-hydroxyapatite-nano-particle-on-zirconia-ceramic-a-potential-solution-for-the-poor-bonding-characteristic-of-zirconia-ceramics-to-resin-cement
#9
Abbas Azari, Sakineh Nikzad, Arash Yazdani, Faezeh Atri, Abbas Fazel Anvari-Yazdi
The poor bonding strength of zirconia to different dental substrates is one of the challenging issues in restorative dentistry. Hydroxyapatite is an excellent biocompatible material with fine bonding properties. In this study, it was hypothesized that hydroxyapatite coating on zirconia would improve its bond strength. Forty-five zirconia blocks were prepared and randomly divided into three groups: hydroxyapatite coating, sandblasting, and no preparation (control). The blocks were bonded to cement and the micro-shear bond strength was measured following load application...
July 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28613063/-application-and-outlook-of-three-dimensional-printing-in-prosthetic-dentistry
#10
Y C Sun, R Li, Y S Zhou, Y Wang
At present, three-dimensional (3D) printing has been applied in many aspects in the field of prosthodontics, such as dental models, wax patterns, guide plates, dental restoration and customized implants. The common forming principles include light curing, sintering and melting-condensation, the materials include pure wax, resin, metal and ceramics. However, the printing precision and the strength of multi-material integrated forming, remains to be improved. In addition, as a technology by which the internal structure of a material can be customized manufacturing, further advantage of 3D printing used in the manufacture of dental restoration lies in the customization functional bionic micro-structures, but the related research is still in its infancy...
June 9, 2017: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/28608498/on-stress-strain-shielding-and-the-material-stiffness-paradigm-for-dental-implants
#11
Raoof Korabi, Keren Shemtov-Yona, Daniel Rittel
BACKGROUND: Stress shielding considerations suggest that the dental implant material's compliance should be matched to that of the host bone. However, this belief has not been confirmed from a general perspective, either clinically or numerically. PURPOSE: To characterize the influence of the implant stiffness on its functionality using the failure envelope concept that examines all possible combinations of mechanical load and application angle for selected stress, strain and displacement-based bone failure criteria...
June 13, 2017: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/28597965/fracture-resistance-of-zirconia-based-all-ceramic-crowns-after-bur-adjustment
#12
Stefan Rues, Franz S Schwindling, Andre Meyer, Peter Rammelsberg, Marc Schmitter
Intra-oral grinding is often required to optimize occlusion of all-ceramic restorations. The effect of burs of different grit size on the fracture resistance of veneered zirconia crowns was investigated in this study. Forty-eight standardized zirconia copings were produced. The ceramic veneer was designed with a positive ellipsoidal defect on the palatal aspect of the crowns. To simulate adjustment of dental restorations by burs, this palatal defect was removed by use of three different diamond-coated burs with grit sizes 46, 107, or 151 μm (fine, medium, or coarse, respectively)...
June 9, 2017: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/28595102/a-comparative-study-of-progressive-wear-of-four-dental-monolithic-veneered-glass-ceramics
#13
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...
May 30, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28594591/30-years-of-translational-research-in-zirconia-dental-implants-a-systematic-review-of-the-literature
#14
Allauddin Siddiqi, Abdul Samad Khan, Sobia Zafar
Thirty years of transitional research in zirconia (Zr) ceramics has led significant improvements in the biomedical field especially in dental Implantology. Oral implants made of Yttria-tetragonal zirconia polycrystals (Y-TZP) because of their excellent mechanical properties, good biocompatibility and aesthetically acceptable colour have emerged as an attractive metal-free alternative to titanium implants. The aim of the review was to highlight the translation research in Zr dental implants that has been conducted over the last three decades using pre-clinical animal models...
June 8, 2017: Journal of Oral Implantology
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
#15
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
https://www.readbyqxmd.com/read/28586235/new-high-translucent-cubic-phase-containing-zirconia-clinical-and-laboratory-considerations-and-the-effect-of-air-abrasion-on-strength
#16
Edward A McLaren, Nathaniel Lawson, James Choi, Juan Kang, Carlos Trujillo
Fabricating all-ceramic restorations with minimal or no application of a secondary phase while maintaining esthetics has been a sought-after goal of the dental profession. The objective has been development of a monolithic material with optical properties similar to the natural tooth without the need for layering porcelain. This article examines some of the newer cubic zirconia materials used in a monolithic form. The authors discuss laboratory-processing issues that affect esthetics, including evaluation of colorizing, sintering, finishing, and polishing, and assess initial translucency testing of several materials while evaluating the effect of air abrasion on flexural strength of these cubic zirconias...
June 2017: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/28581693/a-prospective-clinical-trial-to-assess-the-optical-efficacy-of-pink-neck-implants-and-pink-abutments-on-soft-tissue-esthetics
#17
Mindy S Gil, Shigemi Ishikawa-Nagai, Hawazin W Elani, John D Da Silva, David M Kim, Dennis Tarnow, Ulrike Schulze-Späte, Nurit Bittner
OBJECTIVE: The purpose of this prospective, randomized, controlled, multicenter clinical study was to analyze the optical effects of an anodized pink colored implant shoulder/abutment system in the peri-implant mucosa of immediately placed dental implants. MATERIALS AND METHOD: Forty subjects with a restoratively hopeless tooth in the maxillary esthetic zone, were recruited and randomized to receive either a pink-neck implant, or a conventional gray implant. All patients received an immediate implant and immediate provisional and two identical CAD/CAM titanium abutments with different surface colors: pink and gray, and one zirconia all-ceramic crown...
June 5, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28578984/comparison-of-dimensional-accuracy-of-conventionally-and-digitally-manufactured-intracoronal-restorations
#18
Reza Eftekhar Ashtiani, Leila Nasiri Khanlar, Minoo Mahshid, Alireza Moshaverinia
STATEMENT OF PROBLEM: Advances have been made in digital dentistry for the fabrication of dental prostheses, but evidence regarding the efficacy of digital techniques for the fabrication of intracoronal restorations is lacking. PURPOSE: The purpose of this in vitro study was to compare the dimensional accuracy of intracoronal restorations fabricated with digital and conventional techniques. MATERIAL AND METHODS: A sound mandibular molar tooth received a standard onlay preparation, and onlays were fabricated with 1 of 3 fabrication techniques...
June 2, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28576001/doped-tricalcium-phosphate-bone-tissue-engineering-scaffolds-using-sucrose-as-template-and-microwave-sintering-enhancement-of-mechanical-and-biological-properties
#19
Dongxu Ke, Susmita Bose
β-tricalcium phosphate (β-TCP) is a widely used biocompatible ceramic in orthopedic and dental applications. However, its osteoinductivity and mechanical properties still require improvements. In this study, porous β-TCP and MgO/ZnO-TCP scaffolds were prepared by the thermal decomposition of sucrose. Crack-free cylindrical scaffolds could only be prepared with the addition of MgO and ZnO due to their stabilization effects. Porous MgO/ZnO-TCP scaffolds with a density of 61.39±0.66%, an estimated pore size of 200μm and a compressive strength of 24...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28572420/partial-ceramic-crowns-prepared-by-dental-students-clinical-performance-up-to-five-years
#20
Julia Bühler, Marina Alena Naef, Mauro Amato, Gabriel Krastl, Roland Weiger, Nicola Ursula Zitzmann
Partial ceramic crowns (PCCs) are an accepted treatment option for the restoration of posterior teeth with deficient tooth substance. Data on the survival of PCCs fabricated by dental students are scarce. The aim of this retrospective clinical study was to investigate the clinical performance and longevity of PCCs placed by dental students in the last year of their training program at the University of Basel, Switzerland. Eighty-eight patients who had received at least one PCC (n=108) in the program were considered for clinical assessment; their records were analyzed to detect previous complications or failures; and they were contacted by telephone...
June 2017: Journal of Dental Education
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