الفهرس | Only 14 pages are availabe for public view |
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. |