“…19,20 Recently, nanotechnology, as well as filler surface preparation technology, have greatly improved the properties of flowabletype composites, 12,21 which has led to development of a new flowable-type composite with good strength, abrasion resistance, and excellent anatomy-forming properties, and expanded clinical application for the occlusal cavity. [22][23][24] In the present study, a newly-developed, flowable-type nano-hybrid composite (MI FIL [MI group], G-aenial Universal Flo; GC, Tokyo, Japan) and Heliomolar (HM group) were clinically evaluated for 2 years to compare their performance in posterior cavity restoration cases. The hypothesis tested was that clinical properties of the flowable-type nano-hybrid composite restorations show no difference from those of the paste-type composite restorations.…”