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

Ki-Deok Lee; Se-Hee Park; Jin-Woo Kim; Kyung-Mo Cho

doi:10.5395/JKACD.2011.36.2.132

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Lee, Park, Kim, and Cho: Effect of curing modes on micro-hardness of dual-cure resin cements

Basic Research

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2011; 36(2): 132-138.

Published online: 31 March 2011

DOI: https://doi.org/10.5395/JKACD.2011.36.2.132

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

Ki-Deok Lee, DDS, Se-Hee Park, DDS, PhD, Jin-Woo Kim, DDS, PhD, Kyung-Mo Cho, DDS, PhD

Graduate school student

Professor

Department of Conservative Dentistry, Gangneung-Wonju National University College of Dentistry, Gangneung, Korea.

Correspondence to Kyung-Mo Cho, DDS, PhD. Professor, Department of Conservative Dentistry, Gangneung-Wonju National University College of Dentistry, 120 GangneungDaehangno, Gangneung, Gangwon, Korea 210-702. TEL, +82-33-640-3155; FAX, +82-33-640-3103; drbozon@gwnu.ac.kr

Received 29 January 2011 Revised 24 February 2011 Accepted 24 February 2011

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, 36℃, 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.

Keywords: Curing mode, Dual-cure, Micro-hardness, Resin cement, Self-adhesive

Figures and Tables

Figure 1

Schematic drawing of moulds.

Figure 2

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

Table 1

Composition of materials used in this study

Table 2

Micro-hardness value of test groups in each measurement times (VHN)

The number in the parentheses are the standard deviation.

VHN, Vicker's hardness number.

Different superscript letters mean statistical difference in each measured time.

Table 3

Significances between self and dual curing of each resin cements (independent samples t-test)

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