Effect of pre- and postpolymerization on flexural strength and elastic modulus of impregnated, fiber-reinforced denture base acrylic resins

Luiz Bertassoni, Grayson W. Marshall, Evelise Machado de Souza, Rodrigo Nunes Rached

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Statement of problem: Impregnated fibers require light polymerization; however, little information exists about how different protocols might affect the mechanical properties of reinforced denture base materials. Purpose: The purpose of this study was to compare the effects of pre- or postpolymerization of preimpregnated fibers on the flexural strength and elastic modulus of a reinforced autopolymerized and a heat-polymerized acrylic resin. Material and methods: Seventy-two specimens were divided into 12 treatment groups (n=6), according to type of acrylic resin (autopolymerized or heat polymerized), type of reinforcement, and its pre- or postpolymerization. Impregnated glass fibers (Fibrex-Lab), unimpregnated glass fibers (Fibrante), and ribs made from a restorative composite resin (Z250) were used as reinforcements. The reinforcements were light polymerized either before or after incorporation and processing of the acrylic resins. Specimens were tested in 3-point load and the data were analyzed using 2-way ANOVA and Tukey post hoc test (α=.05). Specimens were further examined using light microscopy, atomic force microscopy, and scanning electron microscopy. Results: Elastic modulus was significantly higher for heat-polymerized acrylic resins than for autopolymerized acrylic resins (P

Original languageEnglish (US)
Pages (from-to)449-457
Number of pages9
JournalJournal of Prosthetic Dentistry
Volume100
Issue number6
DOIs
StatePublished - Dec 2008
Externally publishedYes

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Denture Bases
Acrylic Resins
Elastic Modulus
Hot Temperature
Light
Composite Resins
Atomic Force Microscopy
Ribs
Polymerization
Electron Scanning Microscopy
Microscopy
Analysis of Variance

ASJC Scopus subject areas

  • Oral Surgery

Cite this

Effect of pre- and postpolymerization on flexural strength and elastic modulus of impregnated, fiber-reinforced denture base acrylic resins. / Bertassoni, Luiz; Marshall, Grayson W.; de Souza, Evelise Machado; Nunes Rached, Rodrigo.

In: Journal of Prosthetic Dentistry, Vol. 100, No. 6, 12.2008, p. 449-457.

Research output: Contribution to journalArticle

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