Influence of light-curing modes on the polymerization of dual-cured resin cements

doi:10.3877/cma.j.issn.1674-1366.2013.05.003

Abstract

Abstract:

Objective

To evaluate the polymerization of dual-cured resin cements with various light-curing modes.

Methods

Specimens were fabricated with two brands of dual-cured resin cements：3M RelyX Unicem and DMG PermaCem 2.0， by 4 different light curing modes： intermittent， immediate，delayed light-curing mode and without light-curing. After 24 h's storage in darkness， the surface hardness of the specimens was tested with a micro-hardness tester and the flexural strength was determined with three-point bending test. The glass transition temperature was measured with a differential scanning calorimeter （DSC）. Data were analyzed by covariance analysis.

Results

The order of the surface hardness and flexural strengths of the 4 groups is as follows： intermittent light-curing group， immediate light-curing grouP＞delayed light-curing grouP＞without light-curing group， there were no significant differences between the intermittent light-curing group and immediate light-curing group， but significant differences were found among the other groups. The glass transition temperature cannot be identified as no significant endothermic peak was found in DSC test. Except for the without light-curing group， surface hardness of 3M RelyX Unicem was significantly higher than that of DMG PermaCem 2.0. The flexural strength of DMG PermaCem 2.0 was significantly higher than that of 3M RelyX Unicem.

Conclusions

Intermittent light-curing mode is more beneficial for improving the curing degree than delayed light-curing mode. Dual-cured resin cements can not set completely with purely chemical-cure mode. Compared with 3M RelyX Unicem， DMG PermaCem 2.0 shows poorer compressive performance， better toughness and higher degree of polymerization in the condition of no light.

Key words: Dure-cured resin cements, Polymerization, Surface hardness, Flexural strength, Glass transition temperature

Jiameng ZHAO, Yan WANG, Chen-guang ZENG, Wen-jun ZHU. Influence of light-curing modes on the polymerization of dual-cured resin cements[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2013, 07(05): 357-361.

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Figures/Tables 7

References 13

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组别	试件数	RelyX Unicem	PermaCem 2.0
间歇光照	10	60.34±1.18	45.89±1.13
即刻光照	10	61.47±1.24	46.00±1.15
延迟光照	10	56.41±1.38	43.97±1.09
无光照	10	29.77±1.03	33.27±0.52

组别	试件数	RelyX Unicem	PermaCem 2.0
间歇光照	10	60.34±1.18	45.89±1.13
即刻光照	10	61.47±1.24	46.00±1.15
延迟光照	10	56.41±1.38	43.97±1.09
无光照	10	29.77±1.03	33.27±0.52

变异来源	SS值	df值	MS值	F值	P值
光照模式	1710.100	3	570.033	458.309	0.000
树脂种类	944.298	1	944.298	759.219	0.000
光照模式*树脂种类	594.192	3	198.064	159.244	0.000
误差	39.801	32	1.244	-	-
总变异	93 796.012	40	-	-	-

变异来源	SS值	df值	MS值	F值	P值
光照模式	1710.100	3	570.033	458.309	0.000
树脂种类	944.298	1	944.298	759.219	0.000
光照模式*树脂种类	594.192	3	198.064	159.244	0.000
误差	39.801	32	1.244	-	-
总变异	93 796.012	40	-	-	-

组别	试件数	RelyX Unicem	PermaCem 2.0
间歇光照	10	70.41±2.35	101.47±2.38
即刻光照	10	70.63±2.27	101.93±2.17
延迟光照	10	60.95±1.85	92.66±1.89
无光照	10	40.54±2.79	70.97±3.31

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