Histological investigation of glass-inomer and pro-root effects in healing of periodontal tissues after sealing furcation perforation in dogs' teeth

In root canal therapy some accidents may happen that affects the prognosis of the tooth. For example, when preparing access cavity, perforation of furca is a possibility that leads to tooth loss. Important factors in prognosis of furcation perforation include: the kind of materials used, area that perforation has happened in, time in which perforation is sealed and skill of clinician. Because the kind of material used is important in control of inflammation and periodontal repair, we decided to compare effects of two materials Glass-ionomer and pro-root in this role. Thirty five teeth from one year old dogs were used in this research. It was an exprimental study and done in prof-M.Torabinejad dental research center. After anesthesia and injection of lidocaine, access cavity was prepared and root canals were cleaned by step-back technique and then filled.Furca was perforated by long burs of 3'3 mm. Areas were washed by serum to control bleed-ing.Perforated zones were sealed accidentally by pro-root and glass-ionomer and then the cavities filled by amalgam. Six teeth were considered as positive and negative controls. Two dogs were sacrifized after one month and two after two months by vital perfusion method. Jaws and teeth were seperated and put in formaline [10 percent]. After laboratory procedures and preparing parafine blocks the samples were investigated by microscope. In this research we found that there is no important difference between two material after one and two months but in the same condition pro-root may cause more repair. Both glass-ionomer and pro-root will lead to repair of supporting tissues but inflammation near pro-root is less and periodontal regeneration, Cement and bone formation is more