The effect of the maturation time of calcium silicate-based cement (Biodentine™) on resin bonding: an in vitro study

Abstract

Background: Biodentine™ is currently and regularly used as a direct/indirect capping material and dentine substitute under a resin composite direct restoration. The present study investigated the influence of Biodentine™ maturation time on its shear bond strength to a resin-based composite restorative material. Materials and methods: One hundred fifty PTFE tubes were divided into 2 groups (n = 75), and each group of tubes was filled with a different substrate material (Biodentine™ or GC Fuji IX glass ionomer cement). The tubes were subsequently divided into subgroups (n = 25) that were used to test different substrate maturation times (early, 12 min; medium, 72 h; and delayed, 2 weeks). A resin-based composite restorative material was bonded to the substrates using a 3-step etch and rinse adhesive system (Optibond FL, Kerr), and the bond was tested for shear bond strength. Results: The Biodentine™/12-min group showed a very low shear bond strength of 2.796 ± 2.704 MPa. The values for the Biodentine™/72-h and Biodentine™/2-weeks groups increased as the maturation time interval increased and were 7.986 ± 2.100 MPa and 10.553 ± 3.281 MPa, respectively. The differences between the Biodentine™/12-min group and the Biodentine™/72-h and Biodentine™/2-weeks groups are statistically highly significant (p