Endodontic treatment of primary teeth is more challenging than permanent dentition. Pulp therapy of primary teeth still remain controversial for number of reasons, such as root canal morphology, the close proximity of the permanent successor tooth, inherent physiologic root resorption, complex diagnosis due to patients' immaturity to adequately relate their symptoms and the difficulty of obtaining good radiographic views of primary tooth apices, behavior management of pediatric patients, poor patient compliance and especially the choice of technique and filling materials. Current obturating...