[Comparison of three root canal preparation techniques on debris extrusion from apical foramen]

Periapical reparative process, following root canal therapy [RCT] depends on various factors, including the amount of extruded debris to periapical region. The amount of debris extrusion is a determining factor in periapical reparative process. The aim of this study was to compare the three debris extrusion from apical foramen in root canal preparation techniques; manual step back, rotary balanced force and rotary crown down. A total number of 60 single rooted teeth [incisor and premolar] were chosen non-randomly and were divided into 3 groups according to foramen diameter, root length, root divergence and the tooth type. The root canals were prepared according to standard techniques and debris extrusion was evaluated according to Montgomery method. The weights of debris were recorded by 10[-5] gram precision. The data were analyzed by SPSS software version 13 using one way ANOVA and Post-Hoc tests. Mean debris weight for the step back, balanced force and crown down techniques were 0.39 +/- 0.21, 0.22 +/- 0.09 and 0.26 +/- 0.12 mg respectively. The difference among three groups was statistically significant [P<0.05]. The difference between the two rotary groups was not significant. Debris extrusion in manual step back technique was more than the rotary balance-force and crown down technique

Malignant Fibrous histiocytoma in maxilla: case report and review of literature

Malignant Fibrous Histiocytoma [MFH], is the most common soft tissue sarcoma in adults and is frequently seen is elderly. This lesion is so rare in bones and if seen, is common in long bones and the incidence of the lesion in maxillofacial bones is uncommon. In addition, maxilla is an unusual site for Malignant Fibrous Histiocytoma [MFH]. The aim of this article was to report a case with MFH in maxilla and to review the literature. The patient was a 37 year-old man with MFH in maxilla who was referred to oral and maxillofacial surgery ambulatory ward of Taleghani hospital [2002]. The specific characterization of the patient was the incidence of MFH in maxilla [which is an unusual site for this lesion] in a young age. In this article, the clinical, radiographic and histopathologic characteristics, treatment and prognosis of Malignant Fibrous Histiocytoma [MFH] are discussed. A review of related articles is also done for this rare lesion. With regards to different reported results of MFH follow up, the very poor prognosis of MFH in jaws, regular patient follow up after surgery with regard to its recurrence, is necessary