Property of new flowable composite resin with high radiopacity

Objectives: Clinical Utilization of flowable composite resins (FCR) have recedntly increased due to, improved variety of mechanical properties. In 2011, G-aenial Universal Flo (GC) was released in Oceania, as an injectable type, applicable to occlusal surface, with high flexural strength, high wear resistance, excellent gloss retention and good handling/shaping properties. Subsequently in 2014, G-aenial Flo X (GFX, GC) was developed as a low viscosity type, higher radiopacity for lining floor of cavity preparation (cavity liner). The purpose of this study was to compare GFX and other conventional FCR with their flexural strength and radiopacity properties.

Methods: GFX, Filtek Supreme XTE Flowable (XTE, 3M ESPE), Tetric Evo Flow （TEF, Ivoclar/Vivadent）, Grandio Flow (GRA, voco) were examined in this study as FCR. Flexural strengths of each material were measured by three-point bending test. Flexural strength and radiopacity were tested according to ISO 4049:2009. Data were statistically analyzed (ANOVA, Tukey's test, p<0.05). As to evaluate radiopacity close to clinical situation, each material was filled in cavity of human molar (5.0×4.0×2.5 mm) and radiographed. Filling of each material was controlled to thickness of about 0.5 mm. Each material then was cured by light irradiation for 10 seconds prior to radiographing.

Results: GFX showed the highest flexural strength and radiopacity. In radiograph of human molar, XTE and GRA showed similar radiopacity to enamel. GFX and TEF showed higher radiopacity than human teeth.

Conclusions: These results suggested that GFX has superior flexural strength and radiopacity which may indicate clinical advantages.

 

	GFX	XTE	TEF	GRA
Flexural strength /MPa (S.D)	166.8 (5.1)a	134.3 (4.3)b	107.0 (3.5)c	116.0 (6.1)c
Radiopacity/ Al%	303a	201b	290a	201b

Distinct superscript letters show statistical differences in same line