Background: The principle threat to the health of the dental pulp is dental caries that cause progressive damage of the tooth structures. The damage can convert the reversible pulp to irreversible state. Concepts and treatment principles of deep carious lesions are an area of debate and constant change (Bjorndal and Kidd 2005). The traditional concept of complete caries removal in very deep preparation has been challenged (Thompson et al. 2008). Complete carious dentin removal may not be a prerequisite to arrest caries progression.