J Korean Acad Conserv Dent.  2011 Mar;36(2):132-138. 10.5395/JKACD.2011.36.2.132.

Effect of curing modes on micro-hardness of dual-cure resin cements

• Lee KD
• Park SH
• Kim JW
• Cho KM

• KMID: 2251818
• DOI: http://doi.org/10.5395/JKACD.2011.36.2.132

Abstract

OBJECTIVES
The purpose of this study was to evaluate curing degree of three dual-cure resin cements with the elapsed time in self-cure and dual-cure mode by means of the repeated measure of micro-hardness.
MATERIALS AND METHODS
Two dual-cure self-adhesive resin cements studied were Maxcem Elite (Kerr), Rely-X Unicem (3M ESPE) and one conventional dual-cure resin cement was Rely-X ARC resin cement (3M ESPE). Twenty specimens for each cements were made in Teflon mould and divided equally by self-cure and dual-cure mode and left in dark, 36degrees C, 100% relative humidity conditional-micro-hardness was measured at 10 min, 30 min, 1 hr, 3 hr, 6 hr, 12 hr and 24 hr after baseline. The results of micro-hardness value were statistically analyzed using independent samples t-test and one-way ANOVA with multiple comparisons using Scheffe's test.
RESULTS
The micro-hardness values were increased with time in every test groups. Dual-cure mode obtained higher micro-hardness value than self-cure mode except after one hour of Maxcem. Self-cured Rely-X Unicem showed lowest value and dual-cured Rely-X Unicem showed highest value in every measuring time.
CONCLUSIONS
Sufficient light curing to dual-cure resin cements should provided for achieve maximum curing.

Keyword

Curing mode; Dual-cure; Micro-hardness; Resin cement; Self-adhesive

MeSH Terms

Humidity
Light
Polytetrafluoroethylene
Resin Cements
Polytetrafluoroethylene
Resin Cements

Figure

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  Figure 1 Schematic drawing of moulds.

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  Figure 2 Micro-hardness changes of test groups with the time. VHN, Vicker's hardness number.

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