Mechanical Properties of a Novel Automix Resin-Modified Glass-Ionomer Luting Cement

Objectives:

 Reliable mechanical properties of dental cements are of significant importance to achieve durable crown cementation. This study investigated and compared several key properties of RelyX Luting Plus Automix (RLP-AMX, 3M ESPE), a new automix resin-modified glass-ionomer (RMGI) cement with other leading RMGI cements on market.

 Methods:

 Materials used were RelyX Luting Plus Automix (RLP-AMX, 3M ESPE), RelyX Luting Cement (RLC-HMX, 3M ESPE), RelyX Luting Plus Cement Clicker (RLP-HMX, 3M ESPE), and FujiCEM Automix (FC-AMX, GC). Diametral tensile strength (DTS), compressive strength (CS) and flexural strength (FS) samples were cured in glass tubes at 37^oC and relative humidity of 95% for 1hr followed by storage in 37^oC DI water for 23hrs before testing on an Instron.

Results:

 The mean values of mechanical properties, including the standard deviations, are summarized in the following table:

Mechanical Properties Comparison for Different Products

Material	Delivery Format	DTS (MPa)	CS (MPa)	FS (MPa)
RLP- AMX	Automix  paste-paste	23+2.9	128+7	32+4.2
FC- AMX	Automix paste-paste	18+2.4	122+-3	34+1.9
RLC-HMX	Handmix Powder/ Liquid	24+2.6	110+13	36+2.2
RLP- HMX	Handmix  paste-paste	23+1.2	142+8	31+0.7

 

Conclusions:

ANOVA analysis was performed at p <0.05.  RLP-AMX, RLC-HMX and RLP-HMX had significantly higher diametral tensile strength compared with FC-AMX. There was no significant difference between RLP-AMX and FC-AMX for compressive strength and flexural strength. RLP-AMX had similar properties with other leading RMGI cements on the market.