مقايسه ريزنشت ا÷يكالي دو نوع سيلر AH26 و آپانيت روت سيلر همراه با تهيه فضاي پست به صورت فوري و تاخيري

Comparison of apical leakage using AI/26 and Apatite root sealers with immediate and delayed post space preparation

Background and Aim: Successful preparation and treatment of root canal depends on the compatibility between filling material and canal walls. On the hand, proper crown repair most often require post and core preparation. The aim of this study was to compare the effect of immediate versus delayed root canal preparation for post-space on apical seal using 2 types of scalers Apatite root scaler and AH26. Materials and Methods: This experimental study was conducted on 76 anterior teeth with single root canals. These teeth were sectioned from the cervical area which left at least 12 nun of root portion. All teeth were randomly divided into 4 groups. There were 2 positive and 2 negative control teeth aside from I5 experimental teeth in each group. After cleaning and shaping, root canals were tilled with Gutta Percha, using lateral condensation method and AH26 scaler (in groups 1 and 2), and Apatite root scaler (in groups 3 and 4). Post-spaces were immediately prepared in groups 1 and 3, leaving the last 4 mm of Gutta Percha in root canals. The root canals in groups 2 and 4 were kept in 100% moisture for a week and post-spaces were prepared with the same technique. Finally, all teeth were kept in Indian ink for 72 hours. All teeth were then demineralized in citric acid and demoisturized using ethylie alcohol. Photographs were taken from different angles using stereomicroseope connected to computer with 40x magnification in order to detect dye preparation. Photographs were evaluated by 2 independent individuals separately and dye penetration WaS measured. Data were analyzed using Two-Way .I\.NOVAand Tukey tests. Results: The immediate AH26 group had the lowest and the delayed Apatite root scaler had the highest rate of apical leakage and dye penetration. A significant difference was detected between immediate and delayed methods of postspacc preparation (P