Effect of curing modes on nano - mechanical properties and monomer conversion of dual - cured resin cements

doi:10.3877/cma.j.issn.1674-1366.2018.04.001

Abstract

Abstract:

Objective

To investigate the influence of different curing modes on nanohardness, elastic modulus, indentation creep and monomer conversion of two types of dual-cured resin cements.

Methods

Specimens of 5 mm diameter and 0.5 mm thickness were fabricated with two dual-cured resin cements: RelyX Unicem (RU) and PermaCem 2.0 (PC) , under four different curing modes: immediate light-curing mode (IML) , intermittent light-curing mode (ITL) , delayed light-cuing mode (DL) and chemical curing mode (CC) . After 24 hours′ storage in darkness at room temperature, nanohardness, elastic modulus and indentation creep were measured with a nanoindentation device under a 10 mN load for 20 s holding time. Monomer conversion was measured by Fourier transform infrared spectroscopy- attenuated total reflection. Data were analyzed by SPSS 16.0 software (α=0.05) .

Results

Curing modes showed significant influence on nanohardness and elastic modulus for both RU and PC (P<0.001) . For RU, nanohardness and elastic modulus of CC group were the lowest among the four curing modes, which were (153.1 ± 14.6) MPa and (7.6 ± 0.7) GPa, respectively. For PC, nanohardness and elastic modulus of CC group were the lowest among the four curing modes, which were (244.8 ± 21.1) MPa and (7.3 ± 0.5) GPa, respectively. There were no significant differences in nanohardness and elastic modulus among IML, ITL and DL groups for both RU and PC. Curing modes showed significant influence on indentation creep for RU (F= 135.41, P<0.001) and PC (F= 148.94, P<0.001) , which ranked in the following order: CC>DL>IML, ITL. For RU, there were no significant difference in monomer conversion among the four curing modes (F= 0.899, P= 0.447) . However, there were significant difference in monomer conversion among the four curing modes for PC (F= 20.76, P= 0.004) .

Conclusions

Lack of light activation resulted in an insufficient polymerization and compromised mechanical properties for dual-cured resin cements. Immediate and delayed light curing modes produce higher indentation creep. Curing modes had different levels of impact on the mechanical properties and monomer conversion of dual-cured resin cements with different components.

Key words: Resin cements, Light-curing of dental cements, Self-curing of dental resins, Mechanical properties, Monomer conversion, Curing modes

Qin Huang, Bo Yang, Jiajun Yang, Zhaolin Huo, Yan Wang. Effect of curing modes on nano - mechanical properties and monomer conversion of dual - cured resin cements[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2018, 12(04): 199-204.

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URL: https://zhkqyxyjzz.cma-cmc.com.cn/EN/10.3877/cma.j.issn.1674-1366.2018.04.001

https://zhkqyxyjzz.cma-cmc.com.cn/EN/Y2018/V12/I04/199

Figures/Tables 5

References 18

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材料	成分	填料比例(vol%)	填料粒度（μm）
Rely^TM Unicem	有机基质、甲基丙烯酸酯、酸性单体、引发剂、添加剂、无机填料、填料等	50	<9.5
PermaCem 2.0	含钡玻璃的双酚A双甲基丙烯酸缩水甘油酯(Bis-GMA)、着色剂、添加剂及引发剂等	51	0.02 ~ 3.0

材料	成分	填料比例(vol%)	填料粒度（μm）
Rely^TM Unicem	有机基质、甲基丙烯酸酯、酸性单体、引发剂、添加剂、无机填料、填料等	50	<9.5
PermaCem 2.0	含钡玻璃的双酚A双甲基丙烯酸缩水甘油酯(Bis-GMA)、着色剂、添加剂及引发剂等	51	0.02 ~ 3.0

组别	固化模式
间歇光照组	光照2 s，避光1 min，光照18 s
即刻光照组	即刻光照20 s
延迟光照组	避光2 min，光照20 s
无光照组	无光照，混合后即刻避光保存

组别	固化模式
间歇光照组	光照2 s，避光1 min，光照18 s
即刻光照组	即刻光照20 s
延迟光照组	避光2 min，光照20 s
无光照组	无光照，混合后即刻避光保存

组别	试件数	纳米硬度(MPa)		弹性模量(GPa)		压入蠕变(%)
组别	试件数	RU	PC	RU	PC	RU	PC
即刻光照组	2	385.6 ± 39.5^Aa	312.5 ± 31.4^Ba	8.0 ± 0.4^Aa	8.0 ± 0.5^Aa	13.2 ± 1.3^Aa	14.4 ± 1.3_Ba
间歇光照组	2	379.3 ± 46.2_Aa	311.7 ± 39.0^Ba	8.3 ± 0.3^Aa	8.4 ± 1.0^Aa	13.5 ± 0.9^Aa	14.8 ± 1.6^Ba
延迟光照组	2	353.8 ± 37.2^Aa	295.8 ± 39.1^Ba	8.1 ± 0.6^Aa	7.8 ± 0.5^Aa	14.4 ± 0.8^Ab	15.9 ± 0.9^Bb
无光照组	2	153.1 ± 14.6^Ab	244.8 ± 21.1^Bb	7.6 ± 0.7^Ab	7.3 ± 0.5^Ab	16.4 ± 1.7^Ac	17.2 ± 1.0^Bc
F值	?	486.21	13.87	11.65	17.92	135.41	148.94
P值	?	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001

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