Dimensional changes of dental impression materials by thermal changes

Kwang Mahn Kim, Jong Seok Lee, Kyoung Nam Kim, Sang-Wan Shin

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Dental impression materials for prosthodontic treatment must be easy to use, precisely replicate of oral tissue, be dimensionally stable, and be compatible with gypsum materials. The dimensional accuracy of all materials is affected by thermal changes; impression materials shrink during cooling from mouth temperature (37°C)to room temperature (23°C). Five kinds of light body addition-reaction silicone impression materials [Contrast (CT), Voco Co., Germany; Examix (EM), GC Co., Japan; Extrude (EX), Kerr Co., USA; Imprint II (IM), 3M Co., USA; Perfect (PF), Handae Chemical, Korea] were tested by making cylindrical specimens (6 mm diameter and 12 mm height). The thermal expansion of the impression materials was measured with a thermomechanical analyzer (TMA 2940, TA Instruments, USA) between 23-37°C. Data were analyzed via the Mann-Whitney Usage Test. To simulate actual dental impressions, tooth and tray shapes were modeled to measure the linear shrinkage of impression materials at anterior and posterior locations. The thermal expansion of impression materials tested decreased as follows: CT ≥ PF ≥ EM ≥ EX ≥ IM (p < 0.05). The anterior region changed more than the posterior region for the same impression materials. The dimensional changes averaged more than 40 μm in the anterior region, but less than 40 μm in the posterior region for all materials. Thermal expansion coefficients of some impression materials were significantly different from each other (p < 0.05), and the anterior region had more dimensional change than the posterior region for the same impression materials.

Original languageEnglish
Pages (from-to)217-220
Number of pages4
JournalJournal of Biomedical Materials Research
Volume58
Issue number3
DOIs
Publication statusPublished - 2001 Dec 1
Externally publishedYes

Fingerprint

Dental Impression Materials
Dental materials
Thermal expansion
Hot Temperature
Calcium Sulfate
Addition reactions
Silicones
Gypsum
Contrast Media

Keywords

  • Dimensional change
  • Impression materials
  • Simulated linear shrinkage
  • Thermal change
  • Thermal expansion coefficient

ASJC Scopus subject areas

  • Biomedical Engineering
  • Biomaterials

Cite this

Dimensional changes of dental impression materials by thermal changes. / Kim, Kwang Mahn; Lee, Jong Seok; Kim, Kyoung Nam; Shin, Sang-Wan.

In: Journal of Biomedical Materials Research, Vol. 58, No. 3, 01.12.2001, p. 217-220.

Research output: Contribution to journalArticle

Kim, Kwang Mahn ; Lee, Jong Seok ; Kim, Kyoung Nam ; Shin, Sang-Wan. / Dimensional changes of dental impression materials by thermal changes. In: Journal of Biomedical Materials Research. 2001 ; Vol. 58, No. 3. pp. 217-220.
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