The longevity of conventional particulate filler resin composite (PFC) is uncertain in large restorations with high occlusal stresses. From a biomimetic point of view, the use of short fiber-reinforced resin composite (SFRC) as bulk dentin-replacing material appears a promising treatment strategy and may solve some potential problems associated with conventional PFC restoration in high stress-bearing areas. This chapter briefly presents the theoretical background, benefits, and clinical applications of SFRC in dentistry. Using clinical cases, with packable and flowable versions of SFRC (everX Posterior and everX Flow, GC Corporation, Tokyo, Japan) as bulk fill dentine-replacing material or thick core under surface layer of enamel-replacing PFC, i.e., biomimetic or bilayered composite restorations, to improve the load-bearing capacity and clinical longevity of resin-based composite restorations.

Within the limitations of this case series of clinical indications, the presented restorative approach is a promising and cost-efficient way to extend the indication range of direct resin composite restorations and gives the clinician alternative treatment options.