Results 41 to 50 of about 150,415 (307)

Sol–Gel Derived Polymer Precursors for Stereolithography of ZrC

Advanced Engineering Materials, EarlyView.
ZrC is a critical material target for extreme temperature conditions. This report describes a protocol for preparing ZrC ceramics via stereolithography and examines the impact of the polymer matrix on carbothermal reduction and mechanical stability of 3D printed ZrC.
Charles J. Rafalko, Evelyn Wang, Michael A. Hickner   +2 more
wiley   +1 more source

Dental fluorosis: comparison of two prevalence studies [PDF]

, 2004
Fluorose dentária é uma opacidade do esmalte resultante a partir da ingestão de quantidades excessivas de fluoreto (Exposição crónica) durante a formação do dente. Estimativa do problema entre as populações exposto a fontes de flúor e é necessário devem
Bighetti, Tania Izabel, Costa, Leslie Roberta da, Frazão, Paulo, Mota, Anderson Gomes, Peverari, Adriana Campos   +4 more
core   +1 more source

Removing Oxide Layers and Retaining Oxide‐Free Steel Surfaces by Polishing in Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
In this study, the efficacy of wet mechanical polishing under an oxygen‐free atmosphere for deoxidation and the retention of an oxide‐free steel surface are elucidated using X‐ray photoelectron spectroscopy. The methodology proved successful; however, the results were highly dependent on the preparation of the solvents used to clean the samples after ...
Friedrich Bürger, Lienhard Wegewitz, Wolfgang Maus‐Friedrichs   +2 more
wiley   +1 more source

Factors affecting molar root and periodontal hard tissue changes after orthodontic anterior molar closure of missing tooth spaces retrospective explored based on cone-beam computed tomography three-dimensional reconstruction [PDF]

PeerJ
Objective To correlate the molar teeth and their periodontal conditions after orthodontic anterior removal of the molars to close the gap of missing teeth and to provide risk factor analysis and prognostic assessment for the treatment of such cases ...
Yuhao Huang, Jinglan Zhang, Tianwei Lin, Hong Ai, Ding Bai, Zhihui Mai   +5 more
doaj   +2 more sources

Alteração de cor da coroa dental após a terapia endodôntica regenerativa: Revisão de literatura [PDF]

, 2016
TCC (graduação) - Universidade Federal de Santa Catarina. Centro de Ciências da Saúde. Odontologia.O objetivo deste estudo foi revisar, de modo sistematizado e por meio de casos clínicos, o efeito de materiais usados na terapia endodôntica regenerativa
Springmann, Camila Guerner
core  

Al–Cu Composite Casting of Laser‐Deoxidized Copper: Bonding, Interfacial Chemistry, and Thermal Conductivity

Advanced Engineering Materials, EarlyView.
This study investigates laser‐based oxide removal of Cu inserts in oxygen‐free conditions and examines long‐term oxidation kinetics and surface chemistry under different atmospheres via X‐ray photoelectron spectroscopy. Al–Cu compound casting with differently oxidized surfaces is performed, and intermetallic phase formation, morphology, and thermal ...
Timon Steinhoff, Finn‐Lennard Janthur, Sascha Zimmermann, Sarah Seffer, Jörg Hermsdorf, René Gustus, Ludger Overmeyer, Wolfgang Maus‐Friedrichs, Hans Jürgen Maier, Christian Klose   +9 more
wiley   +1 more source

Pattern of mandibular third molar impaction and its association to caries in mandibular second molar: A clinical variant

Dental Research Journal, 2017
Background: Caries in second molar is common and prophylactic removal of the impacted teeth may be considered appropriate. Caries detection and restoration can be difficult and a restored second molar can undergo recurrent caries if the third molar is ...
V K Prajapati, Ruchi Mitra, K M Vinayak
doaj   +1 more source

Comparative treatment outcomes after bilateral extractions of maxillary second molars or first premolars in patients with class II malocclusion: a retrospective study

Head & Face Medicine, 2023
Background This retrospective cohort study aimed to compare treatment results between bilateral extraction of upper second molars (M2) and first premolars (P1) in terms of treatment timing, cephalometry, upper third molar alignment and relapse in the ...
Eva Paddenberg, Maria Christina Braun, Peter Proff, Carsten Lippold, Christian Kirschneck   +4 more
doaj   +1 more source

Impact of Pre‐Oxidation Treatments on a Recycled MgO/Steel‐Composite as Carbon Free Anode in Aluminum‐Electrolysis Environments

Advanced Engineering Materials, EarlyView.
Cermets (60 vol.% AISI 316L stainless steel, 40 vol.% recycled MgO), intended for use in aluminum electrolysis, were pre‐oxidized in three furnaces with different heating technologies and subjected to a cryolite corrosion test. The different atmospheres influenced the formation of oxide layers, which in turn affected corrosion resistance and ...
Patricia Kaiser, Felix Drechsler, Nora Brachhold, Florian Kerber, Christos G. Aneziris   +4 more
wiley   +1 more source

Transesterification Oil Chicken Using Different Catalysts

Semina: Ciências Exatas e Tecnológicas, 2017
The aim of this study was to evaluate some catalysts in the production of esters from crude chicken and chicken oil pre-treated (neutralized by alkaline solution) oil.
Willian Secco, Camila da Silva, Jamal Awadallak, Edson Antonio da Silva   +3 more
doaj   +1 more source