Simple optical method for measuring free shrinkage

Daranee Tantbirojn, Carmem Pfeifer, Arianna N. Amini, Antheunis Versluis

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Objectives A simple optical method for measuring polymerization shrinkage of dental composites is compared with an established dilatometer. Methods Five restorative composites were used to test the methods: Filtek Supreme Ultra (3M ESPE), Filtek LS (3M ESPE), Premise (Kerr), Gradia Direct (GC), and GC Kalore (GC). Uncured composites were attached to sandblasted silane-treated glass slides. The slides were placed sample side inside a mercury-filled dilatometer (ADAF). The mercury levels were recorded as the materials were light-cured through the glass-slides (40 s). Mercury levels, which correlated with volumetric shrinkage, were recorded for 60 min (N = 6). For the optical method, uncured composite was placed on a smooth silicone platform. A pre-polymerization image was captured under a stereomicroscope, and the specimen was light-cured (40 s). Post-polymerization images were captured at 2, 10, 60, and 90 min (N = 10). Composite outlines were traced to obtain projected surface areas (ImageJ) and volumetric shrinkage was calculated. Results were analyzed using two-way ANOVA (α = 0.05) and Pearson Correlation tests. Shrinkage deformation for both methods was modeled using finite element analysis. Results Volumetric shrinkage at 60 min ranged between 1.24% and 2.24% for dilatometer and 1.35-2.68% for optical methods. Optical method shrinkage was consistently higher than the dilatometer (P =.0001), but the ranking of the composites was the same (Pearson Correlation Coefficient 0.9997). Finite element analysis showed that lower shrinkage values of the dilatometer method could be attributed to bonding of its samples. Significance The optical method using a general-purpose stereomicroscope and public-domain software is a simple and accurate alternative to measure free shrinkage.

Original languageEnglish (US)
Pages (from-to)1271-1278
Number of pages8
JournalDental Materials
Volume31
Issue number11
DOIs
StatePublished - Nov 1 2015

Fingerprint

Dilatometers
Mercury
Composite materials
Polymerization
Finite Element Analysis
Glass
Dental composites
Finite element method
Silanes
Light
Silicones
Analysis of variance (ANOVA)
Public Sector
Analysis of Variance
Tooth
Software

Keywords

  • Dilatometer
  • Finite element analysis
  • Free shrinkage
  • Image analysis software
  • Polymerization shrinkage
  • Resin composite
  • Stereomicroscope

ASJC Scopus subject areas

  • Dentistry(all)
  • Materials Science(all)
  • Mechanics of Materials

Cite this

Simple optical method for measuring free shrinkage. / Tantbirojn, Daranee; Pfeifer, Carmem; Amini, Arianna N.; Versluis, Antheunis.

In: Dental Materials, Vol. 31, No. 11, 01.11.2015, p. 1271-1278.

Research output: Contribution to journalArticle

Tantbirojn, D, Pfeifer, C, Amini, AN & Versluis, A 2015, 'Simple optical method for measuring free shrinkage', Dental Materials, vol. 31, no. 11, pp. 1271-1278. https://doi.org/10.1016/j.dental.2015.08.150
Tantbirojn, Daranee ; Pfeifer, Carmem ; Amini, Arianna N. ; Versluis, Antheunis. / Simple optical method for measuring free shrinkage. In: Dental Materials. 2015 ; Vol. 31, No. 11. pp. 1271-1278.
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N2 - Objectives A simple optical method for measuring polymerization shrinkage of dental composites is compared with an established dilatometer. Methods Five restorative composites were used to test the methods: Filtek Supreme Ultra (3M ESPE), Filtek LS (3M ESPE), Premise (Kerr), Gradia Direct (GC), and GC Kalore (GC). Uncured composites were attached to sandblasted silane-treated glass slides. The slides were placed sample side inside a mercury-filled dilatometer (ADAF). The mercury levels were recorded as the materials were light-cured through the glass-slides (40 s). Mercury levels, which correlated with volumetric shrinkage, were recorded for 60 min (N = 6). For the optical method, uncured composite was placed on a smooth silicone platform. A pre-polymerization image was captured under a stereomicroscope, and the specimen was light-cured (40 s). Post-polymerization images were captured at 2, 10, 60, and 90 min (N = 10). Composite outlines were traced to obtain projected surface areas (ImageJ) and volumetric shrinkage was calculated. Results were analyzed using two-way ANOVA (α = 0.05) and Pearson Correlation tests. Shrinkage deformation for both methods was modeled using finite element analysis. Results Volumetric shrinkage at 60 min ranged between 1.24% and 2.24% for dilatometer and 1.35-2.68% for optical methods. Optical method shrinkage was consistently higher than the dilatometer (P =.0001), but the ranking of the composites was the same (Pearson Correlation Coefficient 0.9997). Finite element analysis showed that lower shrinkage values of the dilatometer method could be attributed to bonding of its samples. Significance The optical method using a general-purpose stereomicroscope and public-domain software is a simple and accurate alternative to measure free shrinkage.

AB - Objectives A simple optical method for measuring polymerization shrinkage of dental composites is compared with an established dilatometer. Methods Five restorative composites were used to test the methods: Filtek Supreme Ultra (3M ESPE), Filtek LS (3M ESPE), Premise (Kerr), Gradia Direct (GC), and GC Kalore (GC). Uncured composites were attached to sandblasted silane-treated glass slides. The slides were placed sample side inside a mercury-filled dilatometer (ADAF). The mercury levels were recorded as the materials were light-cured through the glass-slides (40 s). Mercury levels, which correlated with volumetric shrinkage, were recorded for 60 min (N = 6). For the optical method, uncured composite was placed on a smooth silicone platform. A pre-polymerization image was captured under a stereomicroscope, and the specimen was light-cured (40 s). Post-polymerization images were captured at 2, 10, 60, and 90 min (N = 10). Composite outlines were traced to obtain projected surface areas (ImageJ) and volumetric shrinkage was calculated. Results were analyzed using two-way ANOVA (α = 0.05) and Pearson Correlation tests. Shrinkage deformation for both methods was modeled using finite element analysis. Results Volumetric shrinkage at 60 min ranged between 1.24% and 2.24% for dilatometer and 1.35-2.68% for optical methods. Optical method shrinkage was consistently higher than the dilatometer (P =.0001), but the ranking of the composites was the same (Pearson Correlation Coefficient 0.9997). Finite element analysis showed that lower shrinkage values of the dilatometer method could be attributed to bonding of its samples. Significance The optical method using a general-purpose stereomicroscope and public-domain software is a simple and accurate alternative to measure free shrinkage.

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