Relationship between composite contraction stress and leakage in Class V cavities

Jack Ferracane, John C. Mitchem

Research output: Contribution to journalArticle

149 Citations (Scopus)

Abstract

Purpose: The purpose of this study was to determine the relationship between polymerization contraction stress and leakage in Class V composites. Methods: A microfill (Heliomolar) and two minifill hybrid composites (Herculite, Z100) were tested. Maximum contraction stress (n=5) for the composites was evaluated in a MTS machine at a C-factor of 3 (ratio of bonded to non-bonded surface area). Composite was placed in the gap between the surfaces of glass stubs that had been air abraded, silane treated and coated with a layer of resin adhesive. Specimens were light-cured through the top glass stub for 60 seconds and maximum force was recorded during the first 10 minutes. Leakage (n=10) was evaluated by cutting cylindrical cavity preparations with all enamel margins (C-factor = 3) in bovine incisors. The cavities were treated with two layers of Scotchbond MP adhesive. Composites were applied in one increment, light-cured at the same intensity used in the stress tests, and immediately finished on SiC paper. After 1 day in water, the restorations were placed in silver nitrate, developed and evaluated as a single cross-section (2-D) and multiple cross-sections (3-D) for leakage: 0 (none), 1 (minimal leakage), 2 (to the DEJ), 3 (to line angle), 4 (along the pulpal wall). Results: The maximum stresses (MPa) recorded were lowest for Heliomolar (7.0 ± 0.4), intermediate for Herculite (10.5 ± 0.6) and greatest for Z100 (11.6 ± 1.3). 3-D leakage was as follows: Heliomolar - two specimens scored 1, seven scored 2 and one scored 3; Herculite - six scored 2 and four scored 3; Z100 - eight scored 3 and two scored 4. The Kruskal-Wallis test showed a significant difference in leakage for the three composites (P<0.05), and leakage was greater when evaluated in 3-D. The leakage results correlated with the stress values, i.e. composites with higher contraction stress showed more extensive marginal leakage.

Original languageEnglish (US)
Pages (from-to)239-243
Number of pages5
JournalAmerican Journal of Dentistry
Volume16
Issue number4
StatePublished - Aug 2003

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Glass
Silanes
Light
Silver Nitrate
Incisor
Dental Enamel
Exercise Test
Polymerization
Adhesives
Air
Water
Heliomolar
Scotchbond

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Relationship between composite contraction stress and leakage in Class V cavities. / Ferracane, Jack; Mitchem, John C.

In: American Journal of Dentistry, Vol. 16, No. 4, 08.2003, p. 239-243.

Research output: Contribution to journalArticle

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