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

Abstract

Abstract. 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 lightcured 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 chemicalcuring mode. Therefore, light curing is an essential procedure when using dual-cured RMGIC in clinics.

Comparative Evaluation Of Mechanical Properties Of A Bioactive Resin Modified Glass Ionomer Cement

“…In previous studies, the compression strength of RMGICs were found to be between 67.61 and 218.46 MPa. [10][11][12][13] According to ISO (International Standards Organization) standards, the materials are considered to be reliable if they have a compressive strength above 130 MPa.…”

“…In the literature, the flexural strength values of RMGICs are reported to be between 18.203 and 83.1 MPa. 10,13,15 The minimum flexural strength requirement for of occlusal restorations was stated as 80 MPa by the ISO standards.…”

“…Authors reported that the RIMGICs were manufactured by adding resin monomers (HEMA or Bis-GMA) to the conventional GICs. 10 Previous studies have shown that, compared to conventional GICs, RMGICs exhibit higher mechanical strength, stronger adhesion and lower solubility. 16,17 ACTIVA BioACTIVE restorative material has structural differences from other RMGICs.…”

Compressive strength of calcium silicate-based cement

“…Compressive strength is an indirect measure of bonding and strength of the material [11,12]. It is an important property that may affect clinical performance [13]. This factor plays an important role in the treatment of functional perforations where cements are directly exposed to occlusal forces [14].…”

“…Nivo značajnosti je određen kao p < 0,05. DISKUSIJA KČ je indirektna mera vezivanja i čvrstoće materijala [11,12] i važno je svojstvo koje može uticati na kliničke performanse materijala [13]. Ovaj faktor igra važnu ulogu u tretmanu furkacionih perforacija, gde su cementi direktno izloženi delovanju okluzalnih sila [14].…”