Effect of thermocycling on the microleakage of conventional and resin-modified glass ionomers

Corydon L. Doerr, Thomas J. Hilton, Charles B. Hermesch

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Purpose: To compare the effect of thermocycling on the microleakage of conventional and resin modified glass ionomer restorative materials. Materials and Methods: Class V preparations, centered on the CEJ, were prepared on the lingual and facial surfaces of 30 extracted human third molar teeth. Preparations were conditioned and restored randomly on one surface with Ketac-Fil and on the other surface with Photac-Fil. Restorations were protected during curing, finishing, and storage with Ketac-Glaze. Specimens were aged in room temperature distilled water for 7 days. Half of the specimens were thermocycled for 2,500 cycles in 5°-55° water baths with 5-second dwell times. All specimen apices were sealed with red compound, occlusal fissures sealed with pit/fissure sealant, and surfaces painted to within 1.5 mm of restoration margins with red nail polish. Specimens were stained with 5% methylene blue, invested in orthodontic resin, and sectioned faciolingually. The percentage of dye penetration along the tooth restoration interface was measured with a digital imaging system. Results: Statistical analysis showed that neither thermocycling or type of material had a significant effect on dye penetration.

Original languageEnglish (US)
Pages (from-to)19-21
Number of pages3
JournalAmerican journal of dentistry
Volume9
Issue number1
StatePublished - Dec 1 1996

ASJC Scopus subject areas

  • Dentistry(all)

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