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"This research was carried out to study the difference in the antibacterial capacity of two kinds of filling materials, namely amalgam and composite resin, on S. mutans KPSK2 bacteria with different times of treatment. In total, 48 amalgam and composite resin samples each were prepared and then divided into four groups of treatment. Of each group, 6 samples were used to count the number of bacterial colonies and 6 samples to count the right obstacle zone. The results show that the best antibacterial capacity of composite resin occured within one week, while for amalgam the best performance appears within one day. The antibacterial capacity of flourine containing composites is stronger than that of amalgam for a time of 1 to 2 weeks."

"This case study reviewed conventional root canal treatment of a maxillary first premolar which unexpectedly had a single canal with two foramens. this tooth was recognized as the least frequent tooth appeared neither with additional canal nor unusual root anatomy. Retreatment for this casewas successfull through widening of the access cavity and the root canal. While trying the master cone, it revealed that the canal splitted and had two foramens. A thorough knowledge of the root canal anatomy as well as careful radiograph interpretations were essential in enhancing the root-cleaning procedure."