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Displaying 201 - 225 of 246

Synthesis, Characterization and Evaluation of Urethane Derivatives of Bis-GMA

September 1, 2000

Author(s)

C A. Khatri, J W. Stansbury, Carl R. Schultesiz, Joseph M. Antonucci

The dimethacrylate monomer designated as Bis-GMA ushered in the modern era of polymeric dental restorative, sealant and adhesive materials. Because of its high viscosity, primarily due to the strong hydrogen bond interactions arising from its two hydroxyl

An Improved Synthesis of Ethyl Alpha-Hydroxymethylacrylate, a Unique Isomeric Analog of HEMA

August 1, 2000

Author(s)

Joseph M. Antonucci, J W. Stansbury, Bruce O. Fowler

HEMA is widely used in dental adhesives, bioactive composites and resin-modified glass ionomer cements. In its polymeric forms it is used in a number of biomedical applications, e.g. hydrogels for controlled-release, soft contact lenses, vascular grafts

Physicochemical Evaluation of Bioactive Polymeric Composites Based on Hybrid Amorphous Calcium Phosphates

August 1, 2000

Author(s)

Joseph M. Antonucci, Drago Skrtic, A W. Hailer, E D. Eanes

Amorphous calcium phosphate (ACP), an important precursor in the biological formation of hydroxyapatite (HAP), has recently been utilized as a bioactive filler in resin-based dental materials. It was found that, if ACP was stabilized against premature

Effect of the Monomer and Filler Systems on the Remineralizing Potential of Bioactive Dental Composites Based on Amorphous Calcium Phosphate

June 1, 2000

Author(s)

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

Amorphous calcium phosphate (ACP), because of its high solubility and its rapid transformation to hydroxyapatite (HAP) in aqueous environments, has been utilized as the filler phase in the preparation of bioactive polymer-based composites that have

Effect of Resin Composition on the Remineralizing Ability of Amorphous Calcium Phosphate-Based Polymeric Composites

May 15, 2000

Author(s)

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

Five photoactivated resins, designated BTHZ, TP, U0H, U66H and U132H, were evaluated for the effects of the chemical structure and compositional variations of the resins on the release of mineral (Ca2+ and PO4) ions from ACPfilled composites, i.e. their

MALDI-TOF Mass Spectrometry of Polymeric Silsesquioxanes

March 1, 2000

Author(s)

William E. Wallace, Charles M. Guttman, Joseph M. Antonucci

Matrix-assisted laser desorption ionization time-of-flight mass spectrometry has been shown to be an effective method to determine the degree-of-intramolecular-condensation of polymeric silsesquioxanes. The nature of the organic R' leaving group was found

Polymeric Silsesquioxanes: Degree-of-Intramolecular-Condensation Measured by Mass Spectrometry

March 1, 2000

Author(s)

William E. Wallace, Charles M. Guttman, Joseph M. Antonucci

The degree-of-condensation, defined as the number of residual silanol (SiOH) groups per oligomer, for a variety of silsesquioxane polymers was measured by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Condensation of SiOH

Single-Crystalline Ceramic Whisker-Reinforced Carboxylic Acid-Resin Composites With Fluoride Release

March 1, 2000

Author(s)

H H. Xu, F Eichmiller, Joseph M. Antonucci, Glenn M. Flaim

Currently available glass ionomer, resin-modified glass ionomer and compomer materials are susceptible to brittle fracture and, therefore, are inadequate for use in stress bearing posterior restorations. In the present study, ceramic single-crystalline

Strengthening Composite Resin Restorations via Ceramic Whisker Reinforcement

February 1, 2000

Author(s)

Hockin D. Xu, Gary E. Schumacher, F Eichmiller, Joseph M. Antonucci

Due to their tendency to fracture, current composite for mulations are unsuitalbe for use in large stress-bearing direct posterior restorations that involve cusps. This study investigated the use of single-crystalline ceramic whiskers for the reinforcement

A Microshear Test to Measure the Adhesion of Dental Composites to Tooth Structure

January 1, 2000

Author(s)

Walter G. McDonough, Joseph M. Antonucci, Y Shimada, Gary E. Schumacher, Gale A. Holmes

A Microshear Test to Measure the Bond Between Dental Composites and Dental Substrates

January 1, 2000

Author(s)

Walter G. McDonough, Joseph M. Antonucci, Gary E. Schumacher, Y Shimada

Mechanical property tests such as the diametral tensile, uniaxial tensile, biaxial flexural, shear, and transverse strength tests are commonly used for assessing the bond that forms between dental composites and dental substrates such as dentin and enamel

Effects of Resin Composition on the Remineralizing Ability of Amorphous Calcium Phosphate-Based Polymeric Composites

January 1, 2000

Author(s)

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

Amorphous calcium phosphate (ACP)/acrylic matrix composites have the potential to promote remineralization and/or prevent demineralization of tooth structures by hydroxyapatite (HAP) formation. The goal of this study was to evaluate the effects of

Ethyl-A-Hydroxymethylacrylate, a Novel Isomeric Analog of 2-Hydroxyethyl Methacrylate (HEMA)

January 1, 2000

Author(s)

Joseph M. Antonucci, J W. Stansbury, Bruce O. Fowler

Hema (2-hydroxyethyl methacrylate), a hydrophilic surface active monomer, is widely used in dental adhesive systems and in its polymeric forms in numerous biomedical applications. Poly(HEMA) was the first synthetic hydrogel intended for use as a