Aim: The aim was to perform comparative analysis of bioactive,
contemporary bulk-fill resin-based composites (RBCs) and
conventional glass-ionomer materials for flexural strength (FS),
diametral tensile strength (DTS), and Vickers hardness number
(VHN) in the presence of thermocycling.
Materials and methods: Five restorative materials [Tetric
N-Ceram Bulk Fill; smart dentin replacement (SDR) Flowable
Material; Bioactive restorative material (ACTIVA Bulk Fill); Ketac
Universal Aplicap; and GC Fuji II] were evaluated for DTS, FS,
and VHN. Half the samples in each material group were thermocycled.
The DTS was performed under compressive load at
a cross-head speed of 1.0 mm/min. The FS was assessed by
three-point bending test at a cross-head speed of 0.5 mm/min.
The VHN was determined using a Vickers diamond indenter at
50 gf load for 15 seconds. Differences in FS, DTS, and VHN
were analyzed using analysis of variance (ANOVA) and Tukey
post hoc tests at α = 0.05 level of significance.
Results: N-Ceram, ACTIVA, and SDR demonstrated the highest
and comparable (p > 0.05) FS. The SDR had the highest DTS
value (141.28 ± 0.94), followed by N-Ceram (136.61 ± 1.56)
and ACTIVA (129.05 ± 1.78). Ketac had the highest VHN value
before and after thermocycling.
Conclusion: ACTIVA showed mechanical properties (FS and
DTS) comparable with bulk-fill resin composite materials.
ACTIVA showed potential for durability, as VHN was comparable
Clinical significance: Bioactive materials showed acceptable
DTS and FS values. However, hardness was compromised
compared with included materials. ACTIVA Bulk Fill shows
potential for dentin replacement but it needs to be covered with a
surface-resistant restorative material. Further studies to improve
surface characteristics of ACTIVA Bulk Fill are recommended.