Colorimetric evaluation of composite materials with different thickness by reflectance spectroscopy

Selection of the proper shade and color matching of restorations to natural dentition continues to be one of the most frustrating problems in dentistry and currently available shade guide presents a limited selection of colors compared to those found in natural dentition. This investigation evaluation if the composites resins shade B2 are equivalent to the Vita shade guide B2. Twelve composite resins (Renamel Microfill Super Brite- Cosmedent USA, Renamel Universal Brite- Cosmedent USA, Renamel Microfill Body- Cosmedent USA, Renamel Universal Body- Cosmedent USA, Opallis EB2-FGM, Opallis DB2-FGM, Filtek Supreme XT-3M/ESPE, Filtek Z250-3M/ESPE, Filtek Z350-3M/ESPE, Z100-3M/ESPE, 4 Seasons Dentin - Ivoclar/Vivadent, Tetric Ceram - Ivoclar/Vivadent) shade B2 were used. From each composite, two specimens were made in a steel matrix with 8.0 mm diameter and 10.0 mm different predetermined thickness (0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0 mm). The specimens were 40 seconds light polymerized by LED Ultrablue (DMC). The specimens were measured 10 times each to determine the shade using a reflectance spectrophotometer (Pocket Spec). According to results was verified that not any of composites resins shade B2 evaluated in this study presented values of color difference (ΔE) equivalent to the Vita shade guide B2 and the 2 mm thickness showed the closer match to the Vita shade guide B2.

Avaliação da resistência à fratura e tensões em diferentes implantes e conexões protéticas: Análise in vitro e MEF-3D

Pós-graduação em Odontologia - FOA

5-(1-(4-phenyl)-3-(4-nitrophenyl)triazene)-10,15,20-triphenylporphyrin: a new triazene-porphyrin dye and its spectroelectrochemical properties

The new triazene-porphyrin dye 5-(1-(4-phenyl)-3-(4-nitrophenyl)triazene)-10,15,20-triphenylporphyrin, encompassing a reactive protonated triazene moiety, was prepared starting from meso-tetraphenylporphyrin (H2TPP), first converting it to the 5-(4-nitrophenyl)-10,15,20-triphenylporphyrin, then reducing to the 5-(4-aminophenyl)-10,15,20-tri(phenyl) porphyrin intermediate, and reacting with the diazonium salt of 4-nitroaniline; and characterized by spectroscopic and electrochemical methods. The absorption spectrum of the neutral species resembled the sum of H2TPP and of 1,3-bis(4-nitrophenyl) triazene spectrum, but the deprotonated anionic species showed more delocalized frontier orbitals, behaving as a push-pull system exhibiting triazenide-to-porphyrin charge-transfer transitions.

A next-generation tissue microarray (ngTMA) protocol for biomarker studies

Biomarker research relies on tissue microarrays (TMA). TMAs are produced by repeated transfer of small tissue cores from a 'donor' block into a 'recipient' block and then used for a variety of biomarker applications. The construction of conventional TMAs is labor intensive, imprecise, and time-consuming. Here, a protocol using next-generation Tissue Microarrays (ngTMA) is outlined. ngTMA is based on TMA planning and design, digital pathology, and automated tissue microarraying. The protocol is illustrated using an example of 134 metastatic colorectal cancer patients. Histological, statistical and logistical aspects are considered, such as the tissue type, specific histological regions, and cell types for inclusion in the TMA, the number of tissue spots, sample size, statistical analysis, and number of TMA copies. Histological slides for each patient are scanned and uploaded onto a web-based digital platform. There, they are viewed and annotated (marked) using a 0.6-2.0 mm diameter tool, multiple times using various colors to distinguish tissue areas. Donor blocks and 12 'recipient' blocks are loaded into the instrument. Digital slides are retrieved and matched to donor block images. Repeated arraying of annotated regions is automatically performed resulting in an ngTMA. In this example, six ngTMAs are planned containing six different tissue types/histological zones. Two copies of the ngTMAs are desired. Three to four slides for each patient are scanned; 3 scan runs are necessary and performed overnight. All slides are annotated; different colors are used to represent the different tissues/zones, namely tumor center, invasion front, tumor/stroma, lymph node metastases, liver metastases, and normal tissue. 17 annotations/case are made; time for annotation is 2-3 min/case. 12 ngTMAs are produced containing 4,556 spots. Arraying time is 15-20 hr. Due to its precision, flexibility and speed, ngTMA is a powerful tool to further improve the quality of TMAs used in clinical and translational research.

Sterblichkeit der Juden in Wilna in den letzten 5 1/2 Jahren (1911-1916)

Zemach Schabad

Sterblichkeit der Juden in Wilna in den letzten 5 1/2 Jahren (1911-1916)

Zemach Schabad

Na 1 Nachlass Max Horkheimer, 9 - Korrespondenzen mit der Columbia University in the City of New York (p. I 5, 1-300)

108 Briefe;

Na 1 Nachlass Max Horkheimer, 67 - Korrespondenzen u.a. mit der Columbia University New York (p. II 5, 1-219)

17 Briefe und Beilage zwischen Joseph Christ und Max Horkheimer, 1942-1943; 13 Briefe zwischen Elliot E. Cohen und Max Horkheimer, 1946-1947; 7 Briefe zwischen Stewart G. Cole und Max Horkheimer, 1944-1945 sowie 1 Sonderdruck; 1 Memorandum von Theodor W. Adorno an F. Pollock, 1948; 5 Briefe zwischen dem Collegium [Studentischer Club an der Universität Frankfurt am Main] und Max Horkheimer, 1949; 17 Briefe und Beilage zwischen dem College of Jewish Studies, 1948-1949, 1951 sowie Drucksachen und 9 Papers zum Antisemitismus; 18 Briefe und Beilagen zwischen der Columbia University New York und Max Horkheimer, 1942-1947;

Na 1 Nachlass Max Horkheimer, 517 - Korrespondenzen mit Theodor W. Adorno (p. VI 5, 1 - 151)

50 Briefe zwischen Theodor W. Adorno, Gretel Adorno und Max Horkheimer; 1 Brief von Theodor W. Adorno an Friedel Kracauer, 13.05.1937; 6 Briefe von Herbert Marcuse an Theodor W. Adorno, 1967/1969; 2 Briefe von Theodor W. Adorno an Herbert Marcuse, Juni 1967; 1 Brief von Jacob Taubes an Theodor W. Adorno, 23.01.1967; 1 Brief von Theodor W. Adorno an Joachim Schickel, 16.01.1967; 1 Rechnung vom Druck und Verlagshaus Frankfurt am Main GmbH an Max Horkheimer, 11.09.1968; 1 Brief von Max Horkheimer an das Druck und Verlagshaus Frankfurt am Main GmbH, 16.10.1968; 1 Brief von Gershom Scholem an Herrn Paeschke, 07.03.1968; 1 Brief von dem Magistrat der Stadt Frankfurt a. M. an Max Horkheimer und Theodor W. Adorno, 08.02.1968; 1 Brief von Theodor W. Adorno an Josef Welter, 20.11.1969; 2 Briefe von Theodor W. Adorno an Heidi Schlümann, 1969; 1 Brief von Theodor W. Adorno an Frederick Pollock, 20.05.1964; 1 Brief von Hans Meis an Theodor W. Adorno, 29.04.1969;