Network structure of Bis-GMA- and UDMA-based resin systems.

Network structure of Bis-GMA- and UDMA-based resin systems. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Network structure of Bis-GMA- and UDMA-based resin systems. Abstract Text:

Cynthia J E Floyd,Sabine H Dickens,

OBJECTIVES: The commonly used dental base monomers 2,2-bis[p-(2'-hydroxy-3'-methacryloxypropoxy)phenylene]propane (Bis-GMA) and 1,6-bis(methacryloxy-2-ethoxycarbonylamino)-2,4,4-trimethylhexane (UDMA) require the use of a diluent monomer, such as triethylene glycol dimethacrylate (TEGDMA). The aim of this study was to measure double bond conversion of UDMA/TEGDMA and Bis-GMA/TEGDMA polymeric systems, determine the leachable portion, and analyze network formation by evaluating crosslinking and pendant double bonds. METHODS: UDMA or Bis-GMA was combined with TEGDMA in systematic increments and irradiated to form light cured polymers. Fourier transform infrared spectroscopy in the near-infrared region was used to measure double bond conversion. The leachable sol fraction was analyzed by 1H NMR. Resin composites were formulated. Flexural strength was measured by three-point bending and volumetric shrinkage was determined with a mercury dilatometer. RESULTS: The amount of base monomer greatly influenced double bond conversion, sol fraction, and crosslinking. Increasing base monomer concentration decreased double bond conversion, increased the leachable fraction, and decreased crosslinking and network formation. At mole fractions higher than 0.125, the UDMA polymers had significantly higher conversion than the Bis-GMA polymers. Bis-GMA polymers had higher leachable amounts of unreacted monomer, while UDMA mixtures had more crosslinking than the Bis-GMA mixtures. In regards to the physical properties of resin composites, increasing the base monomer improved flexural strength and decreased volumetric shrinkage. SIGNIFICANCE: This systematic study for the evaluation of conversion, leachability, crosslinking, and network structure along with physical properties, like volumetric shrinkage and flexural strength, are required for the optimization of competing desirable properties for the development of durable materials.

Network structure of Bis-GMA- and UDMA-based resin systems. Publishing Authors By Initials

CJ Floyd,SH Dickens,

For similar investigative techniques: chemistry, analytical: photometry: spectrophotometry: spectrophotometry, infrared: spectroscopy, fourier transform infrared research abstracts see: investigative techniques: chemistry, analytical: photometry: spectrophotometry: spectrophotometry, infrared: spectroscopy, fourier transform infrared research

PUBMED ID PMID:

MEDLINE DATE:

Network structure of Bis-GMA- and UDMA-based resin systems. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Dental materials : official publication of the Aca

VOLUME: 22

Page Numbers: 1143-9

Journal Abbreviation:

ISSN: 0109-5641

DAY: 10

MONTH: 01

YEAR: 2006

Network structure of Bis-GMA- and UDMA-based resin systems. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 8508040

Network structure of Bis-GMA- and UDMA-based resin systems. Keywords Mesh Terms:

KEYWORDS: Spectroscopy, Fourier Transform Infrared

MESH TERMS: chemistry

Chemical & Substance for Abstract: Network structure of Bis-GMA- and UDMA-based resin systems. Information

Substance Name: Bisphenol A-Glycidyl Methacrylate

Registry Number: 1565-94-2

Grant and Affiliation Information for Network structure of Bis-GMA- and UDMA-based resin systems.

AFFILIATION: American Dental Association Foundation, Paffenbarger Research Center, National Institute of Standards and Technology, Gaithersburg, MD 20899-8546, USA.

Country: England

AGENCY: United States NIDCR

GRANT: DE13298

ACRONYM: DE

MEDLINETA: Dent Mater

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Network structure of Bis-GMA- and UDMA-based resin systems Related Publications

• Achieving transparency in implementing abortion laws.
• Chapter 5. Legal implications of ICD therapy.
• Comparative judicial embryology: judges' approaches to unborn human life.
• Conscientious commitment.
• Degree of cure and fracture properties of experimental acid-resin modified composites under wet and dry conditions.
• Dissociation of alpha and theta activity as a function of verbal and visuospatial tasks.
• Dose form modification - a common but potentially hazardous practice. A literature review and study of medication administration to older psychiatric inpatients.
• Environmental precursors to rapid light carbon injection at the Palaeocene/Eocene boundary.
• Frank Dickens: 15 December 1899-25 June 1986.
• Inhibition of ratliver succinoxidase by synthetic oestrogens and related substances.
• International Society for Stem Cell Research (ISSCR) Guidelines for the Conduct of Human Embryonic Stem Cell Research (December 2006).
• Legal developments in assisted reproduction.
• Legislative approaches to assisted reproduction.
• Medically unexplained presentations and quality of life: A study of a predominantly South Asian primary care population in England.
• Muscle abnormalities in idiopathic toe-walkers.
• Network structure of Bis-GMA- and UDMA-based resin systems.
• Normal acoustic reflex amplitude growth and the influence of cochlear hearing loss.
• PULMONARY STENOSIS PRODUCED BY ANEURYSM OF THE ASCENDING AORTA.
• Prenatal management of anencephaly.
• Psychosocial predictors of health-related quality of life and health service utilisation in people with chronic low back pain.
• Sexual contact influences orientation to plant attractant in Colorado potato beetle, Leptinotarsa decemlineata Say (Coleoptera: Chrysomelidae).
• Speech discrimination in the elderly.
• The challenges of reproductive and sexual rights.
• The economics of publishing.
• The introduction of reversible sterilization.
• Trials and errors: accidents in administration.
• [Current trends in bioethics in Canada]
• [The Pickwick syndrome. From literary speculations to sleep research]