Cl. Doerr et al., EFFECT OF THERMOCYCLING ON THE MICROLEAKAGE OF CONVENTIONAL AND RESIN-MODIFIED GLASS IONOMERS, American journal of dentistry, 9(1), 1996, pp. 19-21
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 thi
rd 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 i
n 5 degrees-55 degrees water baths with 5-second dwell times. All spec
imen apices were sealed with red compound, occlusal fissures sealed wi
th pit/fissure sealant, and surfaces painted to within 1.5 mm of resto
ration margins with red nail polish. Specimens were stained with 5% me
thylene blue, invested in orthodontic resin, and sectioned faciolingua
lly. The percentage of dye penetration along the tooth restoration int
erface was measured with a digital imaging system. Results: Statistica
l analysis showed that neither thermocycling or type of material had a
significant effect on dye penetration (P>0.5).