A High Filler Loaded Flowable Composite, "CLEARFIL MAJESTY FLOW"

A new flowable composite resin, Clearfil Majesty Flow (MJ-Flow), has recently been developed. Filler particles constituting MJ-Flow are treated with new surface coating technology for better affinity with matrix monomers. By means of the new technology, MJ-Flow is high filler loading (81wt%) material similar to universal composite resins.

Objectives: The purpose of this study was to compare the physical and rheological properties of MJ-Flow with those of other flowable composite resins.

Methods: Filler content was measured in the following method. Composite resin paste was dispersed in methanol and centrifuged. The supernatant was removed. This cycle was repeated three times. Then, the residual filler was dried enough. Filler content was calculated from the weight before and after this procedure. Reological measurements were performed using dynamic oscillation rheometer at 37˚C, gap between the plates 500 µm, 1Hz, 100% strain for 100sec after pre-shear 1Hz, 1% strain for 60sec. Flexural strength was measured by ISO4049:2000 method. The composite resins were hardened by halogen light unit(JETLITE3000/J.Morita).

Results: MJ-Flow showed higher filler loading, flexural strength and modulus than other flowable composite resins in this study. The tan delta and complex viscosity of MJ-Flow were values between other materials.

Composite	CLEARFIL MAJESTY FLOW (KURARAY MEDICAL)	Filtek Supreme Plus Flow (3M ESPE)	Esthet · X flow (DENTSPLY Caulk)	Venus flow (Heraeus Kulzer)	Tetric Flow (Ivoclar Vivadent)
Filler content (wt%)	81(0)	65(0.6)	62(0.9)	63(0)	64(0.1)
Flexural Strength (MPa)	145(8)	125(7)	114(13)	127(7)	121(10)
Flexural Modulus (GPa)	10.5(0.5)	6.1(0.1)	6.0(0.3)	4.9(0.1)	5.5(0.5)
tan delta (60sec)	0.9(0)	1.1(0.1)	0.8(0.1)	0.7(0.1)	1.6(0.3)
Complex viscosity (Pa·s)	18.5(1.3)	76.9(5.3)	18.8(3.1)	43.1(6.1)	15.8(3.3)

Conclusions: The viscoelasticities of MJ-Flow are observed same as others in spite of a 10% higher filler content than the others. MJ-Flow showed high flexural strength and modulus because of the high filler content.