الفهرس 
Aim of the StudyOnly 14 pages are availabe for public view
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Abstract
Sandwich technique is still considered one of the treatment
options in restoration of deep cavities. It was developed to overcome the difficulty of bonding of resin composite, especially in deep interproximal cavities.( 1, 2) Conventional or resin modified glass ionomer cements (RMGICs) are the materials of choice under the different restorative materials. Resin modified glass ionomer cement is preferable over the
conventional one under resin composite for its higher mechanical
properties, immediate setting and excellent bonding to overlying resin
composite.( 3) Although, resin modified glass ionomer is considered a biocompatible material, it is not recommended for direct pulp capping.
For this reason, manufacturers launched several biocompatible materials
and claimed that these materials are capable of regeneration of dentin.( 4, 5) They can be used under different restorative materials whether there is a
frank pulp exposure or not. All these materials suffer from their long
setting time which made the immediate placement of the final restoration
difficult.( 6) Because of their long setting time, isolation becomes a
problem. It was reported also that these materials have low wear
resistance, making them not suitable as enamel substitutes and they are
only used as dentin substitutes, which need an overlying final restoration.( 7)
Biocompatible materials should be kept isolated for several days
before being prepared by a bur to reduce their height. This procedure does
not only add more trauma to the pulp, but it also complicates the clinical
situation and prolongs the clinical procedure time. Introduction
2 Recently, a tricalcium silicate cement (BiodentineTM) was
introduced in the market to overcome the bad esthetics of the gray
mineral trioxide aggregate (MTA) and the long setting time of the white
MTA.( 8) These two properties made BiodentineTM a good candidate as
base material under resin composite. ( 9, 10) Unfortunately, its setting time is
still long relative to RMGICs.
Bonding between BiodentineTM and resin composite is one of the
complicated situations during clinical judgment. The questions are raised,
can bonding for the material be performed immediately after its setting, or it is preferable to wait before further treatment? What is the favorable surface condition for bonding? What is the proper adhesive system we can use? For all these questions, the test of bond strength between BiodentineTM and composite with and without delay using different
adhesive systems might be of value.