Oral and jaw lymphoma in an Iranian population.

INTRODUCTION: Lymphoma is the second most common malignancy of head and neck. Many studies have been carried out in different population groups to detect the subtypes of oral and jaw lymphoma, but such research has not been conducted in Iran. The purpose of this study was to determine the subtypes of oral and jaw lymphoma by immunohistochemistry. MATERIALS AND METHODS: A total of 36 paraffin-embedded blocks (25 males and 11 females) with primary diagnosis of non-Hodgkin lymphoma were studied by immunohistochemical markers according to cellular morphology. RESULTS: The frequencies were diffuse large B-cell (41.1%), low-grade B-cell (35.2%), peripheral T-cell (11.7%), Burkitt (5.8%), and Hodgkin lymphomas (5.8%). The involved sites were salivary gland (26.4%), maxillary bone (23.5%), mandibular soft tissues (17.6%), maxillary sinus (14.7%), mandibular bone (8.8%), tonsils and tongue (5.7%), and lip and vestibule (2.9%), and 2 cases (5.5%) turned out to be undifferentiated carcinomas. The most common lymphomas in male and females were diffuse large B-cell and low-grade B-cell lymphomas, respectively. CONCLUSIONS: The epidemiology of different types of oral lymphoma in a sample of Iranian population was not similar with other populations of the world. Immunohistochemistry and molecular methods are required to prove the diagnosis in addition to typing of lymphoma.

In-vitro evaluation of the effect of canal curvature on adaptation of gutta-percha in canals obturated with HEROfill system by CBCT.

A hermetic seal of the root canal space following canal preparation is important in endodontics. This study evaluated the effect of canal curve on adaptation of gutta-percha to dentinal walls of canals obturated using the Herofill system. For this in vitro study, 80 mesial roots of mature human first molars with length of 16 mm, curve between 5° and 45°, and no caries or resorption of the root surface were selected. A cone beam computed tomography system was used to evaluate the presence or absence of a gap in the samples. Photographs were taken in three sections: 2 mm above the curve, at the curve and 2 mm below the curve. The gap area was identified using Photoshop and AutoCAD software. Kruskal Wallis and Mann-Whitney tests were used to analyze the data mounted in a castcurve. There were significant differences between the two lateral condensation groups with various curves; roots with more curve had more gaps. When the Herofill and lateral condensation groups were compared without considering the sections and curve, there was a significant difference between these groups and the Herofill group had less gaps. The Herofill system is an alternative to the lateral condensation technique in severely curved canals.