ABSTRACT
Problems like perforation of furca may happen in root canal therapy. The material used for sealing of perforation is important in control of inflammation and periodontal repair. Previous studies show that ProRoot is the best material for treating these cases but is too expensive. Recently one Iranian material which is called cold -ceramic is produced in Yazd University. The aim of this study is to compare the histologic effects of cold ceramic and pro-root in healing of periodontal tissues after sealing of furcation perforation in dog teeth. Thirty five premolars of one year old dogs were used. After anesthesia by injection of lidocaine, access cavity was prepared and root canal was filled by gutta percha and AH [26] sealers with step-back technique. Then the furca was perforated 3X3 mm with long burs and washed by physiologic serum. The perforated zones were sealed randomly by pro-root and cold ceramic and the cavity was filled with amalgam. Six teeth were considered as positive and negative controls. Two dogs after one month and two after two months were sacrificed by vital perfusion. Jaws and teeth were separated and put in formalin 10%. After laboratory procedures, the samples were investigated by microscope. The data was analyzed by Mann - whitney and Kruskal - wallis tests. The results showed that ProRoot caused more repair in the same condition but there was no significant difference between the two materials after one and two months. Considering the lower price and availability of cold ceramic, if other tests are confirmed, cold ceramic may be a suitable substitution for ProRoot