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Displaying 126 - 150 of 246

Effect of Chemical Structure and Composition of the Resin Phase on Mechanical Strength and Vinyl Conversion of Amorphous Calcium Phosphate-Based Composites

March 1, 2004

Author(s)

Drago Skrtic, Joseph M. Antonucci, Walter G. McDonough, D W. Liu

The mechanical properties of recently developed bioactive, anti-demineralizaing/remineralizing, amorphous calcium phosphate (ACP)-based composites are in need of improvment. The objective of this study was to elucidate the effect of structure and

Synthesis and Characterization of PEG and PEG Urethane Dimethacrylate Hydrogels

March 1, 2004

Author(s)

Sheng Lin-Gibson, S Bencherif, James A. Cooper, N. R. Washburn, Joseph M. Antonucci

A key area in the repair and regeneration of tissues is optimizing the polymeric scaffold-tissue response. This study is designated to better understand the relationships between polymer matrix structure and properties to cell response. The current study

Organogelators and Their Application in Bioactive Dental Composites

February 1, 2004

Author(s)

Elizabeth Wilder, Joseph M. Antonucci

Concerns regarding the use of amalgam fillings in restorative dentistry have spurred an interest in alternative polymeric dental materials such as bioactive composites. However, current polymeric dental composites are inadequate for use in posterior dental

Structure-Property Relationships of Thermoset Methacrylate Composites as a Function of Resin Matrices, Nanofillers, and Nanofiller Surface Chemistries

February 1, 2004

Author(s)

K W. O'Brien, Elizabeth Wilder, Joseph M. Antonucci

The goal of this research is to better understand the interactions and relationships between nanoparticle fillers, their surface treatment chemistries, various dental resin matrices, and the resultant properties of these thermoset methacrylate composites

Urethane Methacrylate Resin Based Amorphous Calcium Phosphate Composites

October 22, 2003

Author(s)

W F. Regnault, Drago Skrtic, Joseph M. Antonucci

This study investigates the mechanical and ion-release properties of potentially bioactive amorphous calcium phosphate composites derived from three types of urethane dimethacrylate resins. Both the biaxial flexure strength, especially after immersion in

Effect of Bifunctional Comonomers on Mechanical Strength and Water Sorption of Amorphous Calcium Phosphate- and Silanized Glass-filled Bis-GMA-Based Composites

August 1, 2003

Author(s)

Drago Skrtic, Joseph M. Antonucci

This study seeks to elucidate structure-property relationships in a series of unfilled dental copolymers and their composites. The copolymers/composites were derived from photo-activated binary monomer systems based on 2,2-bis[p-2 -hydroxy-3

Amorphous Calcium Phosphate-Based Bioactive Polymeric Composites for Mineralized Tissue Regeneration

June 1, 2003

Author(s)

Drago Skrtic, Joseph M. Antonucci, E D. Eanes

Amorphous calcium phosphate (ACP), a postulated precursor in the formation of biological hydroxyapatite, has been evaluated as a filler phase in bioactive polymeric composites that utilize dental monomers to form the matrix phase on polymerization. In

Thermal and Flammability Properties of a Silica-PMMA Nanocomposite

June 1, 2003

Author(s)

Takashi Kashiwagi, A B. Morgan, Joseph M. Antonucci, Mark R. VanLandingham, Richard H. Harris Jr., W H. Awad, John R. Shields

PMMA, poly(metheylmethacrylate), nanocomposites were made by in situ radical polymerization of MMA, methylmethacrylate, with colloidal silica (ca. 12 nm) to study the effects of nanoscale silica particles on the physical properties and flammability

Volumetric Contraction and Methacrylate Conversion in Photo-polymerized Amorphous Calcium Phosphate/Methacrylate Composites

June 1, 2003

Author(s)

Drago Skrtic, J W. Stansbury, Joseph M. Antonucci

Because of its relatively high solubility in aqueous media and its rapid transformation to hydroxyapatite, amorphous calcium phosphate (ACP) has been utilized as the filler phase of resin-based bioactive composites that have remineralization potential. The

Chemistry of Silanes Interfaces in Dental Polymers and Composites

January 1, 2003

Author(s)

Joseph M. Antonucci, Sabine H. Dickens, Bruce O. Fowler, H H. Xu, Walter G. McDonough

The performance and service life of glass- or ceramic-filled polymeric composites depend on the nature of their resin, filler and interfacial phases as well as the efficacy of the polymerization process. The synergy that exists between the organic polymer

Continuous-Fiber Preform Reinforcement of Dental Resin Composite Restorations

January 1, 2003

Author(s)

H H. Xu, Gary E. Schumacher, F Eichmiller, R C. Peterson, Joseph M. Antonucci, H J. Mueller

Objectives. Direct-filling resin composites are used in relatively small restorations and are not recommended for large restorations with severe occlusal stresses. The aim of this study was to reinforce composites with fiber preforms, and to investigate

Effect of Acidic Comonomers on Methacrylate Conversion and Mechancial Strength of Bioreactive Composites Based on Amorphous Calcium Phosphate

January 1, 2003

Author(s)

Joseph M. Antonucci, Walter G. McDonough, D W. Liu, Drago Skrtic

Effect of Acidic Comonomers on Methacrylate Conversion and Mechanical Strength of Bioactive Composites Based on Amorphous Calcium Phosphate

January 1, 2003

Author(s)

Joseph M. Antonucci, Walter G. McDonough, Da-Wei Liu, Drago Skrtic

Prior research utilizing a monomer system consisting of the dental monomers Bis-GMA and TEGDMA at equal masse levels with neutral, hydrophilic monomers indicated that, generally, the ternary monomer enhanced the degree of methacrylate conversion (DC) but