Biodentin Shear Bond Strength Lab Report

Abstract

This study measured the shear bond strength of conventional glass ionomer cements (GICs; Ketac Molar Easymix and Fuji IX) bonded Biodentin that had been allowed to set for 2 different time intervals.

Forty-eight Biodentin specimens were prepared; half were stored for 12 minutes, and the remaining 24 specimens were stored for 48hours at 37 °C and 100% humidity. Each group was divided into 2 subgroups of 12 specimens, and each GIC was layered on each of the Biodentin preparations.

The GIC-Biodentin shear bond strengths were measured and were compared by using one-way analysis of variance. The shear bond strengths with the 12-minute and 48-hour Biodentin were 5.25 Mpa and 6.62Mpa respectively, for Ketac Molar Easymix and 7.46 Mpa

BiodentineTM has easy handling, excellent anatomic form, very good marginal adaption and establishes a very good inter-proximal contact, used as a permanent dentine substitute. Resin composite cannot be placed over biodentin as Grech et al advice postponing acid etching of biodentin 24 hrsupto 1 week alter setting in order not to effect the compressive strength of -biodentin(11,14).However, placing a Glass ionomer cement material over biodentin as a part of permanent or provisional should be considered . it has been claimed that conventional
GIass ionomer can be layered over set biodentin after 12mins,which enables single visit procedures(15).Measuring the bond strength of conventional Glass ionomer to partially set has not been reported and might to support its usage in one-visit pulp therapy.

Material and Method
The material used in this study were BIODENTIN(SEPTODONT), and 2 conventional GICs, FUJI IX(GC, Tokyo,Japan) and Ketac Molar Easy mix (3M ESPE,St Paul ,MN).The compositions and powder –to –liquid ratio of the GIassinomer are listed in Table

In practice, this is often not the case, and instead, fractures may take place in the bond material, the substrate, or both and may extend beyond the initial bonded area. What is actually being measured is the fracture force of a bonded system for a particular method of load application and should only cautiously be interpreted as bond strength [12]Hence, the failure modes of e.g. Glass ionomer cement [12],[13] and Biodentine [14],[15] to dentine were largely cohesive within the cement rather than at the interface. Therefore, the rigidity of the material has a significant influence on the interpretation of bond strength