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Displaying 1 - 25 of 45

Biophysical Characterization of Functionalized Titania Nanoparticles and Their Application in Dental Adhesives

February 2, 2017
Author(s)
Jirun Sun, Elijah J. Petersen, Stephanie S. Watson, Christopher M. Sims, Alexander Kassman, Stanislav A. Frukhtbeyn, Drago Skrtic, Meryem T. Ok, Deborah S. Jacobs, Qiang Ye, Bryant C. Nelson
It is demonstrated that carboxylic acid-functionalized titanium dioxide (TiO2) NPs produce significantly higher levels of reactive oxygen species (ROS) after visible light irradiation (400–800 nm, 1600 mW/cm2) in comparison to nonfunctionalized TiO2 NPs

Tuning photo-catalytic activities of TiO2 nanoparticles using dimethacrylate resins

August 20, 2015
Author(s)
Jirun Sun, Stephanie S. Watson, David Allsopp, Deborah Jacobs, Drago Skrtic
Unique photo-catalytic activities (PCAs) of titanium dioxide nanoparticles (TiO2 NPs) made them attractive in many potential applications for medical devices. This study examined the benefits of the PCAs of TiO2 NPs through functionalization of the TiO2

Structural and Dynamical Studies of Acid Mediated Conversion in Amorphous-Calcium-Phosphate Based Dental Composites

October 31, 2014
Author(s)
Fan Zhang, Andrew J. Allen, Lyle E. Levine, Mark D. Vaudin, Drago Skrtic, Joseph M. Antonucci, Kathleen M. Hoffman, Anthony A. Giuseppetti, Jan Ilavsky
Amorphous calcium phosphate (ACP) based composites are promising restorative dental materials attributable to ACP's capacity to release calcium and phosphate ions through a complex reaction in which ACP is converted to its crystalline, apatitic form

Ultra-small-Angle X-ray Scattering - X-ray Photon-Correlation Spectroscopy Studies of Incipient Structural Changes in Amorphous Calcium Phosphate Based Dental Composites

February 28, 2012
Author(s)
Fan Zhang, Andrew J. Allen, Lyle E. Levine, Laura Espinal, Joseph M. Antonucci, Drago Skrtic, Justin N. O'Donnell, Jan Ilavsky
The local structural changes in amorphous calcium phosphate (ACP) based dental composites were studied upon heating using both static, bulk measurement techniques and recently developed ultra-small angle X-ray scattering - X-ray photon correlation

Polymerization Stress Development in Dental Composites: Effect of Cavity Design Factor

March 13, 2009
Author(s)
Joseph M. Antonucci, Anthony A. Giuseppetti, Justin N. O'Donnell, Gary E. Schumacher, Drago Skrtic
Objective: To assess the effect of the cavity design factor (C-factor) on polymerization stress development (PSD) in resin composites. Methods: An experimental resin (BT resin) was prepared, which contained 2,2-bis[p-(2 hydroxy-3 -methacryloxypropoxy

Shear Bond Strength of Bioactive Amorphous Calcium Phosphate Composites

November 1, 2007
Author(s)
Gary E. Schumacher, Joseph M. Antonucci, Justin N. O'Donnell, Drago Skrtic
Bioactive, amorphous calcium phosphate (ACP)-filled polymeric composites in aqueous environments release significant amounts of Ca and PO4 ions leading to deposition of an apatitic mineral that is similar to that found in enamel. These materials are

Structure/Property Relationships in Urethane Dimethacrylate-Based ACP Composites

April 26, 2006
Author(s)
William Regnault, Tonya Icenogle, Joseph M. Antonucci, Da-Wei Liu, Drago Skrtic
In this study, the effects of two comonomers (the low molecular mass, hydrophilic 2-hydroxyethyl methacrylate (HEMA) vs. the high molecular mass, less hydrophilic, more flexible polyethyleneglycol extended UDMA (PEG-U)) on the PS, PSD and DC were assessed

Amorphous Calcium Phophate Composites With Improved Mechanical Properties

January 1, 2006
Author(s)
Justin N. O'Donnell, Joseph M. Antonucci, Drago Skrtic
Young s Modulus, diametral tensile strength and water sorption. Mechanically milling the filler increased the volume of fine particles in the sample, resulting in a more homogeneous intra-composite distribution of ACP and a reduction in voids. In turn

Ethoxylated Bisphenol Dimethacrylate-Based Amorphous Calcium Phosphate Composites

January 1, 2006
Author(s)
Drago Skrtic, Joseph M. Antonucci, D W. Liu
Improving the anti-demineralizing/remineralizing and mechanical properties of amorphous calcium phosphate composites has been the focus of our recent research. In this study an ethoxylated bisphenol A dimethacrylate (EBPADMA) was blended with triethylene

Effect of an Organogelator on the Properties of Dental Composites

May 1, 2005
Author(s)
Elizabeth Wilder, K S. Wilson, Janet Quinn, Drago Skrtic, Joseph M. Antonucci
Bioactive dental composites containing amorphous calcium phosphate have the potential to remineralize caries lesions and white spots, but their applications are limited by the inherent weakness of calcium phosphate as a filler material. In order to extend

In Vitro Cytotoxicity of Amorphous Calcium Phosphate Composites

May 1, 2005
Author(s)
Carl Simon Jr., Joseph M. Antonucci, D W. Liu, Drago Skrtic
Calcium phosphate-based biomaterials are being widely used as bone substitutes in dentistry as well as reconstructive and orthopedic surgery because of their generally accepted good biocompatibility, osteoconductivity and/or bone-bonding properties. Among