Objective: Previous studies were indicated that the application of a thin layer of flowables under the conventional composites could be recommended especially at stress-bearing areas. The main hypothesis of this study was to determine whether the contraction forces of flowables adversely affect the bonding procedure during polymerization. The purpose of this study was to determine the polymerization contraction stress values of flowable resin composites, Admira Flow (AF; Voco), Heliomolar Flow (HF; Ivoclar-Vivadent) and Prima Flow (PF; DMG), in comparison with a conventional hybrid composite Point 4 (PO; Kerr). Methods: Polymerization forces were generated by 20 second standard exposure of halogen blue light (Elipar Trilight, 3M-Espe) application to specimens (size: 4x4x2 mm) while mounted in Stress-Strain Analyzer (C Factor = 0,33). Contraction forces during polymerization were also recorded for 300 seconds at room temperature. Maximum contraction stress (MPa), force rate (N/s), relative force rate (%/s) of each material were statistically analyzed by ANOVA and Tukey's Multiple Comparison test. Results: The mean maximum contraction stress values and standard deviations were found; 1,36^a (0,19) for HF, 2,00^b (0,07) for PF, 2,07^b (0,16) for PO and 2,10^b (0,18) for AF. As shown the superscripts above, only HF exhibited statistically significant lower contraction stress values in all evaluated materials. Conclusion: There were no significant differences in adverse contraction forces found between flowables and hybrid composite tested, so it could be concluded that there is no inconveniences for application of flowable composites to cavity in point of generated contraction forces during polymerization process.

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