Physical-property comparison of a chairside- or laboratory-polymerized permanent soft-liner during 1 year

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12 Citations (Scopus)

Abstract

Purpose: This investigation examined the influence of polymerization mode and water storage duration on the Shore A hardness, water sorption, resin solubility, and glass transition temperature of Permasoft, a commercial soft denture liner that is polymerized either chairside or in the laboratory. Materials and Methods: Specimen disks (31-mm diameter x 10 mm thick) and bars (44 x 8.5 x 1.2 mm) were polymerized following manufacturer's recommendations. The chairside polymerization process was simulated by pouring the mixed components into a mold and processing at 70°C for 15 minutes under 2-psi pressure. Laboratory-polymerized specimens of the same dimensions were fabricated by processing under 500-psi pressure at 100°C for 45 minutes. Specimens were stored in distilled water at 37°C for 1, 7, and 30 days, and 6 and 12 months. Specimens were tested for Shore A hardness, water sorption, resin solubility, and glass transition temperature after the prescribed interval. To determine the effects of polymerization mode and storage time on material properties, a repeated-measures ANOVA (hardness data) and a two-way ANOVA (sorption and solubility data) with appropriate post-hoc tests were used. Results: Shore A hardness values increased from a low of 9.4 (±0.5) units immediately after fabrication to a maximum of 15.9 (±1.1) units after 1 year. Mode of polymerization did not influence hardness (p = .9851). Water-sorption values ranged from 4.2 (±0.2%) of dry weight to 14.7 (±2.5%) after 1 year. Resin solubility varied from 10.3 (±0.6%) of preimmersion weight to 15.4 (±1.1%), and immersion duration had no effect on solubility. In addition, after 1 year of storage, no difference in resin solubility or water sorption was found with respect to cure mode. The glass transition temperature for chairside-polymerized samples approximated -10°C, while that for labpolymerized samples approximated -15°C. Conclusions: With regard to the material properties evaluated in this study, clinically processed Permasoft liner was equivalent to the laboratory-processed material.

Original languageEnglish (US)
Pages (from-to)92-99
Number of pages8
JournalJournal of Prosthodontics
Volume8
Issue number2
DOIs
StatePublished - Jan 1 1999

Fingerprint

Solubility
Hardness
Polymerization
Water
Transition Temperature
Glass
Denture Liners
Analysis of Variance
Pressure
Weights and Measures
Immersion
Fungi

Keywords

  • Chairside-polymerized
  • Denture
  • Laboratory-polymerized
  • Soft-liner

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

@article{06843ac53225404cb1181d2287bc0bec,
title = "Physical-property comparison of a chairside- or laboratory-polymerized permanent soft-liner during 1 year",
abstract = "Purpose: This investigation examined the influence of polymerization mode and water storage duration on the Shore A hardness, water sorption, resin solubility, and glass transition temperature of Permasoft, a commercial soft denture liner that is polymerized either chairside or in the laboratory. Materials and Methods: Specimen disks (31-mm diameter x 10 mm thick) and bars (44 x 8.5 x 1.2 mm) were polymerized following manufacturer's recommendations. The chairside polymerization process was simulated by pouring the mixed components into a mold and processing at 70°C for 15 minutes under 2-psi pressure. Laboratory-polymerized specimens of the same dimensions were fabricated by processing under 500-psi pressure at 100°C for 45 minutes. Specimens were stored in distilled water at 37°C for 1, 7, and 30 days, and 6 and 12 months. Specimens were tested for Shore A hardness, water sorption, resin solubility, and glass transition temperature after the prescribed interval. To determine the effects of polymerization mode and storage time on material properties, a repeated-measures ANOVA (hardness data) and a two-way ANOVA (sorption and solubility data) with appropriate post-hoc tests were used. Results: Shore A hardness values increased from a low of 9.4 (±0.5) units immediately after fabrication to a maximum of 15.9 (±1.1) units after 1 year. Mode of polymerization did not influence hardness (p = .9851). Water-sorption values ranged from 4.2 (±0.2{\%}) of dry weight to 14.7 (±2.5{\%}) after 1 year. Resin solubility varied from 10.3 (±0.6{\%}) of preimmersion weight to 15.4 (±1.1{\%}), and immersion duration had no effect on solubility. In addition, after 1 year of storage, no difference in resin solubility or water sorption was found with respect to cure mode. The glass transition temperature for chairside-polymerized samples approximated -10°C, while that for labpolymerized samples approximated -15°C. Conclusions: With regard to the material properties evaluated in this study, clinically processed Permasoft liner was equivalent to the laboratory-processed material.",
keywords = "Chairside-polymerized, Denture, Laboratory-polymerized, Soft-liner",
author = "Parr, {Gregory R} and Frederick Rueggeberg",
year = "1999",
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T1 - Physical-property comparison of a chairside- or laboratory-polymerized permanent soft-liner during 1 year

AU - Parr, Gregory R

AU - Rueggeberg, Frederick

PY - 1999/1/1

Y1 - 1999/1/1

N2 - Purpose: This investigation examined the influence of polymerization mode and water storage duration on the Shore A hardness, water sorption, resin solubility, and glass transition temperature of Permasoft, a commercial soft denture liner that is polymerized either chairside or in the laboratory. Materials and Methods: Specimen disks (31-mm diameter x 10 mm thick) and bars (44 x 8.5 x 1.2 mm) were polymerized following manufacturer's recommendations. The chairside polymerization process was simulated by pouring the mixed components into a mold and processing at 70°C for 15 minutes under 2-psi pressure. Laboratory-polymerized specimens of the same dimensions were fabricated by processing under 500-psi pressure at 100°C for 45 minutes. Specimens were stored in distilled water at 37°C for 1, 7, and 30 days, and 6 and 12 months. Specimens were tested for Shore A hardness, water sorption, resin solubility, and glass transition temperature after the prescribed interval. To determine the effects of polymerization mode and storage time on material properties, a repeated-measures ANOVA (hardness data) and a two-way ANOVA (sorption and solubility data) with appropriate post-hoc tests were used. Results: Shore A hardness values increased from a low of 9.4 (±0.5) units immediately after fabrication to a maximum of 15.9 (±1.1) units after 1 year. Mode of polymerization did not influence hardness (p = .9851). Water-sorption values ranged from 4.2 (±0.2%) of dry weight to 14.7 (±2.5%) after 1 year. Resin solubility varied from 10.3 (±0.6%) of preimmersion weight to 15.4 (±1.1%), and immersion duration had no effect on solubility. In addition, after 1 year of storage, no difference in resin solubility or water sorption was found with respect to cure mode. The glass transition temperature for chairside-polymerized samples approximated -10°C, while that for labpolymerized samples approximated -15°C. Conclusions: With regard to the material properties evaluated in this study, clinically processed Permasoft liner was equivalent to the laboratory-processed material.

AB - Purpose: This investigation examined the influence of polymerization mode and water storage duration on the Shore A hardness, water sorption, resin solubility, and glass transition temperature of Permasoft, a commercial soft denture liner that is polymerized either chairside or in the laboratory. Materials and Methods: Specimen disks (31-mm diameter x 10 mm thick) and bars (44 x 8.5 x 1.2 mm) were polymerized following manufacturer's recommendations. The chairside polymerization process was simulated by pouring the mixed components into a mold and processing at 70°C for 15 minutes under 2-psi pressure. Laboratory-polymerized specimens of the same dimensions were fabricated by processing under 500-psi pressure at 100°C for 45 minutes. Specimens were stored in distilled water at 37°C for 1, 7, and 30 days, and 6 and 12 months. Specimens were tested for Shore A hardness, water sorption, resin solubility, and glass transition temperature after the prescribed interval. To determine the effects of polymerization mode and storage time on material properties, a repeated-measures ANOVA (hardness data) and a two-way ANOVA (sorption and solubility data) with appropriate post-hoc tests were used. Results: Shore A hardness values increased from a low of 9.4 (±0.5) units immediately after fabrication to a maximum of 15.9 (±1.1) units after 1 year. Mode of polymerization did not influence hardness (p = .9851). Water-sorption values ranged from 4.2 (±0.2%) of dry weight to 14.7 (±2.5%) after 1 year. Resin solubility varied from 10.3 (±0.6%) of preimmersion weight to 15.4 (±1.1%), and immersion duration had no effect on solubility. In addition, after 1 year of storage, no difference in resin solubility or water sorption was found with respect to cure mode. The glass transition temperature for chairside-polymerized samples approximated -10°C, while that for labpolymerized samples approximated -15°C. Conclusions: With regard to the material properties evaluated in this study, clinically processed Permasoft liner was equivalent to the laboratory-processed material.

KW - Chairside-polymerized

KW - Denture

KW - Laboratory-polymerized

KW - Soft-liner

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