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A comparison study on the flexural strength and compressive strength of four resin-modified luting glass ionomer cements

Issue title: Frontiers in Biomedical Engineering and Biotechnology – Proceedings of the 4th International Conference on Biomedical Engineering and Biotechnology, 18–21 August 2015, Shanghai, China

Guest editors: Feng Liu, Dong-Hoon Lee, Ricardo Lagoa and Sandeep Kumar

Article type: Research Article

Authors: Li, Yuana; b | Lin, Honga; b; * | Zheng, Ganga; b | Zhang, Xuehuia; b | Xu, Yongxianga; b

Affiliations: [a] Department of Dental Materials, Dental Medical Devices Testing Center, Peking University School and Hospital of Stomatology, Beijing, China | [b] National Engineering Laboratory for Digital and Material Technology of Stomatology, Peking University, Beijing, China

Correspondence: [*] Address for correspondence: Hong Lin, Department of Dental Materials, Peking University School and Hospital of Stomatology, No. 22 South Avenue Zhongguancun, Haidian District, Beijing 100081, China. Tel.: +86 010 82195266; Fax: +86 01062164691; E-mail: hong196lin@sina.com

Keywords: Resin-modified glass ionomer cements, flexural strength, compressive strength, curing mode, light cured and chemical cured

DOI: 10.3233/BME-151284

Journal: Bio-Medical Materials and Engineering, vol. 26, no. s1, pp. S9-S17, 2015

Published: 2015
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The purpose of this study is to compare the differences in flexural strength and compressive strength between four resin-modified luting glass ionomer cements that are commonly used in clinics. Furthermore, this study investigates the influence of curing mode on the flexural strength and compressive strength of dual-cured resin-modified glass ionomer cements. Initially, flexural strength and compressive strength test specimens were prepared for RL, NR, GCP, and GCC. The RL group and NR group were cured by the light-curing mode and chemical-curing mode. Five specimens were prepared for each test group, and the flexural strength and compressive strength of each were measured. Data were analyzed by one-way ANOVA with SPSS 13.0. Furthermore, the fracture morphology of the flexural specimens was observed by SEM. The result of the mean flexural strength of each group is as follows: the NR light-cured group > NR chemically-cured group > GCP > RL light-cured group > GCC > RL chemically-cured group. More specifically, the flexural strength of the NR light-cured group ((42.903±4.242) MPa) is significantly higher (P<0.05) than those of the other groups, and in addition, the flexural strength of the light-curing mode is significantly higher (P<0. 05) than that of both the NR and RL chemically-cured groups. The result of the mean compressive strength of each group is as follows: GCP > NR chemically-cured group > NR light-cured group > GCC > RL light-cured group > RL chemically-cured group. Although the compressive strengths of the NR and GCP groups are higher than those of the GCC and RL groups, there are no significant differences (P>0.05) between NR and GCP, and no significant differences between GCC and RL. Furthermore, there are no significant differences (P>0.05) between the two curing modes on NR and RL. From the present study, it can be concluded that NR has superior flexural strength and compressive strength compared to the other three materials. Additionally, the curing mode can affect the flexural strength of dual-cured RMGIC because with the light-curing mode, the flexural strength is higher than with the chemical-curing mode. Therefore, light curing is an essential procedure when using dual-cured RMGIC in clinics.

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