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https://www.readbyqxmd.com/read/27896288/ultrastructure-of-early-amelogenesis-in-wild-type-amelx-and-enam-mice-enamel-ribbon-initiation-on-dentin-mineral-and-ribbon-orientation-by-ameloblasts
#1
Charles E Smith, Yuanyuan Hu, Jan C-C Hu, James P Simmer
INTRODUCTION: Dental enamel is comprised of highly organized, oriented apatite crystals, but how they form is unclear. METHODS: We used focused ion beam (FIB) scanning electron microscopy (SEM) to investigate early enamel formation in 7-week-old incisors from wild-type, Amelx(-/-), and Enam(-/-) C56BL/6 mice. FIB surface imaging scans thicker samples so that the thin enamel ribbons do not pass as readily out of the plane of section, and generates serial images by a mill and view approach for computerized tomography...
November 2016: Molecular Genetics & Genomic Medicine
https://www.readbyqxmd.com/read/27895359/awake-craniotomy-for-brain-tumours-in-pakistan-an-initial-case-series-from-a-developing-country
#2
Saad Akhtar Khan, Karim Rizwan Nathani, Badar Uddin Ujjan, Muhammad Danish Barakzai, Syed Ather Enam, Faraz Shafiq
Awake craniotomy offers safe resection of brain tumours in eloquent area. Aga Khan University Hospital, Karachi, recently started the programme in Pakistan, and the current study was planned to assess our experience of the first 16 procedures. The retrospective study comprised all such procedures done from November 2015 to May 2016. Pre-operative and post-operative variables were analysed. Of the 16 patients, 11(68.75%) were males and 5(31.25%) were females. The overall median age was 37 years (interquartile range[IQR]: 23-62 years)...
October 2016: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/27890354/chairside-cad-cam-materials-part-1-measurement-of-elastic-constants-and-microstructural-characterization
#3
Renan Belli, Michael Wendler, Dominique de Ligny, Maria Rita Cicconi, Anselm Petschelt, Herwig Peterlik, Ulrich Lohbauer
OBJECTIVE: A deeper understanding of the mechanical behavior of dental restorative materials requires an insight into the materials elastic constants and microstructure. Here we aim to use complementary methodologies to thoroughly characterize chairside CAD/CAM materials and discuss the benefits and limitations of different analytical strategies. METHODS: Eight commercial CAM/CAM materials, ranging from polycrystalline zirconia (e.max ZirCAD, Ivoclar-Vivadent), reinforced glasses (Vitablocs Mark II, VITA; Empress CAD, Ivoclar-Vivadent) and glass-ceramics (e...
November 24, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27884403/chairside-cad-cam-materials-part-2-flexural-strength-testing
#4
Michael Wendler, Renan Belli, Anselm Petschelt, Daniel Mevec, Walter Harrer, Tanja Lube, Robert Danzer, Ulrich Lohbauer
OBJECTIVE: Strength is one of the preferred parameters used in dentistry for determining clinical indication of dental restoratives. However, small dimensions of CAD/CAM blocks limit reliable measurements with standardized uniaxial bending tests. The objective of this study was to introduce the ball-on-three-ball (B3B) biaxial strength test for dental for small CAD/CAM block in the context of the size effect on strength predicted by the Weibull theory. METHODS: Eight representative chairside CAD/CAM materials ranging from polycrystalline zirconia (e...
November 21, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27880028/effect-of-different-surface-treatments-on-bond-strength-of-resin-cement-to-a-cad-cam-restorative-material
#5
Kubilay Barutcigil, Çağatay Barutcigil, Esra Kul, Mehmet Mustafa Özarslan, Ulviye Sebnem Buyukkaplan
PURPOSE: To investigate the effects of various surface treatment methods on the shear bond strength of self-adhesive resin cement to a novel CAD/CAM hybrid ceramic material. MATERIALS AND METHODS: A novel hybrid ceramic restorative material (Vita Enamic) was used in this study. Sixty resin block specimens were prepared and separated into six groups for each surface treatment method (n = 10); group 1: control group, no treatment applied; group 2: sandblasted by 30 μm silicate-coated alumina particles (CoJet Sandblasting); group 3: 50 μm Al2 O3 sandblasting; group 4: 10% hydrofluoric acid; group 5: no surface treatment + universal adhesive (3M Single Bond Universal); group 6: 200 mJ, 10 Hz 2W Er,Cr:YSGG laser treatment...
November 23, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/27880011/shear-bond-strength-of-repair-systems-to-new-cad-cam-restorative-materials
#6
Özlem Üstün, Işıl Keçik Büyükhatipoğlu, Aslı Seçilmiş
PURPOSE: To evaluate the bond strength of repair systems (Ceramic Repair, Clearfil Repair) to computer-aided design/computer-assisted machining (CAD/CAM) restorative materials (IPS e.max CAD, Vita Suprinity, Vita Enamic, Lava Ultimate). MATERIALS AND METHODS: Thermally aged CAD/CAM restorative material specimens (5000 cycles between 5°C and 55°C) were randomly divided into two groups according to the repair system: Ceramic Repair (37% phosphoric acid + Monobond-S + Heliobond + Tetric N Ceram) or Clearfil Repair (40% phosphoric acid + mixture of Clearfil Porcelain Bond Activator and Clearfil SE Bond Primer + Clearfil SE Bond + Filtek Z250)...
November 23, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/27843691/co-existing-spinal-intradural-ependymal-cyst-and-sacral-tarlov-cyst-in-adult-onset-tethered-cord-syndrome-with-syringomyelia-case-report-and-literature-review
#7
Hamid H Rai, Muhammad F Khan, Syed Ather Enam, Imtiaz Hashmi
BACKGROUND: Synchronous spinal intradural ependymal cysts and sacral Tarlov cysts in adult onset tethered cord syndrome are extremely rare. CASE DESCRIPTION: A 23-year-old male presented with back pain radiating into both lower extremities, accompanied by acute onset of gait difficulty and sphincter dysfunction. Magnetic resonance imaging identified a low lying conus medullaris, syringomyelia with septations extending from T12 to S1, a tethered cord, and a thickened filum terminale with a sacral Tarlov cyst...
2016: Surgical Neurology International
https://www.readbyqxmd.com/read/27836147/effect-of-artificial-toothbrushing-and-water-storage-on-the-surface-roughness-and-micromechanical-properties-of-tooth-colored-cad-cam-materials
#8
Simon Flury, Elisabeth Diebold, Anne Peutzfeldt, Adrian Lussi
STATEMENT OF PROBLEM: Because of the different composition of resin-ceramic computer-aided design and computer-aided manufacturing (CAD-CAM) materials, their polishability and their micromechanical properties vary. Moreover, depending on the composition of the materials, their surface roughness and micromechanical properties are likely to change with time. PURPOSE: The purpose of this in vitro study was to investigate the effect of artificial toothbrushing and water storage on the surface roughness (Ra and Rz) and the micromechanical properties, surface hardness (Vickers [VHN]) and indentation modulus (EIT), of 5 different tooth-colored CAD-CAM materials when polished with 2 different polishing systems...
November 14, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27830145/in-vitro-comparative-analysis-of-fracture-resistance-in-inlay-restoration-prepared-with-cad-cam-and-different-systems-in-the-primary-teeth
#9
Huseyin Simsek, Sera Derelioglu
Objective. The aim of this study was to compare to fracture resistance test of inlay restorations prepared using direct inlay technique (Gradia® Direct Composite) and Indirect Restoration System® (Gradia Indirect Composite) and CAD/CAD system (Vita Enamic® Block). Study Design. 48 noncarious extracted maxillary second primary molars were randomly divided into 4 groups with 12 in each group. All the teeth were prepared based on inlay class II preparations except for the control group. Other groups were restored with Gradia Direct Composite, Gradia Indirect Composite, and Vita Enamic Block, respectively...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27812614/reliability-failure-probability-and-strength-of-resin-based-materials-for-cad-cam-restorations
#10
Kiatlin Lim, Adrian U-Jin Yap, Shruti Vidhawan Agarwalla, Keson Beng-Choon Tan, Vinicius Rosa
Objective: This study investigated the Weibull parameters and 5% fracture probability of direct, indirect composites, and CAD/CAM composites. Material and Methods: Discshaped (12 mm diameter x 1 mm thick) specimens were prepared for a direct composite [Z100 (ZO), 3M-ESPE], an indirect laboratory composite [Ceramage (CM), Shofu], and two CAD/CAM composites [Lava Ultimate (LU), 3M ESPE; Vita Enamic (VE), Vita Zahnfabrik] restorations (n=30 for each group). The specimens were polished, stored in distilled water for 24 hours at 37°C...
September 2016: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/27802120/influence-of-thermal-cycling-on-flexural-properties-and-simulated-wear-of-computer-aided-design-computer-aided-manufacturing-resin-composites
#11
A Tsujimoto, W W Barkmeier, T Takamizawa, M A Latta, M Miyazaki
OBJECTIVE: The purpose of this study was to evaluate the influence of thermal cycling on the flexural properties and simulated wear of computer-aided design/computer-aided manufacturing (CAD/CAM) resin composites. METHODS: The six CAD/CAM resin composites used in this study were 1) Lava Ultimate CAD/CAM Restorative (LU); 2) Paradigm MZ100 (PM); 3) CERASMART (CS); 4) Shofu Block HC (SB); 5) KATANA AVENCIA Block (KA); and 6) VITA ENAMIC (VE). Specimens were divided randomly into two groups, one of which was stored in distilled water for 24 hours, and the other of which was subjected to 10,000 thermal cycles...
November 1, 2016: Operative Dentistry
https://www.readbyqxmd.com/read/27773617/micro-shear-bond-strength-of-different-resin-cements-to-ceramic-glass-polymer-cad-cam-block-materials
#12
Isil Cekic-Nagas, Gulfem Ergun, Ferhan Egilmez, Pekka Kalevi Vallittu, Lippo Veli Juhana Lassila
PURPOSE: The aim of this study was to evaluate the effects of hydrofluoric acid treatment on bond strength of resin cements to three different types of ceramic/glass containing CAD-CAM block composite materials. METHODS: CAD-CAM block materials of polymer infiltrated (Vita Enamic), resin nanoceramic (Lava Ultimate) and nanoceramic (Cerasmart) with a thickness of 1.5mm were randomly divided into two groups according to the surface treatment performed. In Group 1, specimens were wet-ground with silicon carbide abrasive papers up to no...
March 10, 2016: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/27725517/adhesive-bonding-to-polymer-infiltrated-ceramic
#13
Judith Schwenter, Fredy Schmidli, Roland Weiger, Jens Fischer
Aim of this study was to investigate the mechanism of adhesive bonding to the polymer-infiltrated ceramic VITA Enamic [VE]. Shear bond strength was measured with three resin composite cements: RelyX Unicem 2 Automix, Clearfil SA and Variolink II on polished surfaces of VE and its components silicate ceramic [SC] and polymer [PM] (n=12). Further, the effect of etching VE with 5% HF for 15-240 s and the application of silane coupling agents was analyzed in a screening test (n=6). Shear bond strength measurements were performed after 24 h of water storage at 37°C...
2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27689836/blue-light-transmittance-of-esthetic-monolithic-cad-cam-materials-with-respect-to-their-composition-thickness-and-curing-conditions
#14
B Stawarczyk, D Awad, N Ilie
Determining the amount of blue light (360-540nm) passing through nine monolithic computer-aided design/computer-aided manufacturing (CAD/CAM) materials depends on material thickness, initial irradiance, and the distance between the curing unit and the specimen's surface. A total of 180 specimens of two thicknesses (1 mm and 2 mm, n=10/subgroup) were fabricated from TelioCAD, VITA CAD-Temp (VCT), experimental nanocomposite, LAVA Ultimate (LU), VITA ENAMIC (VE), VITA MarkII (VM), IPS EmpressCAD (IEC), IPS e.maxCAD (IEM), and CELTRA DUO (CD)...
September 2016: Operative Dentistry
https://www.readbyqxmd.com/read/27689770/microtensile-bond-strength-of-composite-cement-to-novel-cad-cam-materials-as-a-function-of-surface-treatment-and-aging
#15
D P Lise, A Van Ende, J De Munck, Lcc Vieira, L N Baratieri, B Van Meerbeek
OBJECTIVES: To evaluate the effect of different surface treatments on the bond strength to a composite and a polymer-infiltrated ceramic CAD/CAM block after six-month artificial aging. METHODS AND MATERIALS: Two types of CAD/CAM blocks (Cerasmart, GC; Enamic, Vita Zahnfabrik) were cut in slabs of 4-mm thickness, divided into six groups, and subjected to the following surface treatments: group 1: no treatment; group 2: sandblasting (SB); group 3: SB + silane (Si); group 4: SB + Si + flowable composite (see below); group 5: 5% hydrofluoric acid etching (HF) + Si; and group 6: 37% phosphoric acid etching (H3PO4) + Si...
September 30, 2016: Operative Dentistry
https://www.readbyqxmd.com/read/27644182/final-restoration-of-implants-with-a-hybrid-ceramic-superstructure
#16
Andreas Kurbad
The use of materials with elastic properties for the fabrication of dental implant superstructures seems to be a promising way to reduce the functional occlusal forces on implants. Vita Enamic (Vita Zahnfabrik, Bad Säckingen), a hybrid ceramic material for CAD/CAM technology, is available in a special form that can be relatively easily combined with titanium (Ti) base connectors for the fabrication of abutment crowns and mesostructures. Thus, an easily manageable method is available for reducing peak loads on dental implant fixtures...
2016: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/27639808/wear-strength-modulus-and-hardness-of-cad-cam-restorative-materials
#17
Nathaniel C Lawson, Ritika Bansal, John O Burgess
OBJECTIVE: To measure the mechanical properties of several CAD/CAM materials, including lithium disilicate (e.max CAD), lithium silicate/zirconia (Celtra Duo), 3 resin composites (Cerasmart, Lava Ultimate, Paradigm MZ100), and a polymer infiltrated ceramic (Enamic). METHODS: CAD/CAM blocks were sectioned into 2.5mm×2.5mm×16mm bars for flexural strength and elastic modulus testing and 4mm thick blocks for hardness and wear testing. E.max CAD and half the Celtra Duo specimens were treated in a furnace...
September 14, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27585486/polymer-infiltrated-ceramic-network-structures-for-resistance-to-fatigue-fracture-and-wear
#18
Haifa El Zhawi, Marina R Kaizer, Asima Chughtai, Rafael R Moraes, Yu Zhang
OBJECTIVE: To investigate fatigue fracture resistance and wear behavior of a polymer infiltrated ceramic network (PICN) material (ENAMIC, Vita Zahnfabrik). METHODS: Anatomically shaped ENAMIC monolithic crowns were milled using a CAD/CAM system. The crowns were cemented on aged dentin-like composite abutments (Z100, 3M ESPE) with resin-based cement (Vita DUO Cement, Vita). The specimens were subjected to 2 types of fatigue and wear tests: (1) accelerated sliding-contact mouth-motion step-stress fatigue test (n=24) in water; and (2) long-term sliding-contact mouth-motion fatigue/wear test using a clinically relevant load (P=200N, n=8) in water...
November 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27546861/dentin-bond-strength-of-two-resin-ceramic-computer-aided-design-computer-aided-manufacturing-cad-cam-materials-and-five-cements-after-six-months-storage
#19
Simon Flury, Stefanie Zita Schmidt, Anne Peutzfeldt, Adrian Lussi
The aim was to investigate dentin bond strength of two resin-ceramic materials and five cements after 24 h and six months storage. Cylinders (n=15/group) of Lava Ultimate (3M ESPE) and VITA ENAMIC (VITA Zahnfabrik) were cemented to mid-coronal dentin of 300 extracted human molars with RelyX Ultimate (3M ESPE), PANAVIA F2.0 (Kuraray), Variolink II (Ivoclar Vivadent), els cem (Saremco Dental), or Ketac Cem Plus (3M ESPE). Shear bond strength (SBS) was measured after 24 h or six months storage (37°C, 100% humidity) and statistically analyzed (significance level: α=0...
October 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27530571/job-satisfication-and-external-effective-factors-in-operating-room-nurses-working-educational-hospitals-in-2015-a-cross-sectional-questionnaire-study
#20
Enam Alhagh Charkhat Gorgich, Azizollah Arbabisarjou, Fatheme Taji, Sanam Barfroshan
INTRODUCTION & AIM: Identification of effective factors on job satisfaction can impact the efficiency and quality of health services and personal life. The Aim of this study was to investigate, Job Satisfaction and External Effective Factors in Operating Room Nurses Educational Hospitals of Zahedan in 2015. MATERIALS & METHODS: This descriptive-analytical study was conducted on 137 operating room Nurses of Ali-Ebne-Abitaleb, Khatam-Al-Anbia and Alzahra hospital in Zahedan, Iran, enrolled through the convenience sampling in 2015...
2016: Global Journal of Health Science
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