ABSTRACT
Background: Congenital Pouch colon(CPC) is a rare variant of anorectal malformations (ARM) whose etiopathogenesis and management are not yet standardized. This prospective study seeks to establish the histopathological characteristics and it’s inference on the etiopathogenesis, management and prognosis of CPC. Methods: This was a prospective comparative study including all neonates with CPC and other high ARM. The excised pouch from the neonates with CPC and a strip of sigmoid colon from other high ARM patients were sent for biopsy and the histopathological features compared. Results: Histopathogical abnormalities were seen involving all the layers of the colonic pouch including mucosa, submucosa and muscularis propria. The statistically significant histopathological differences in the colonic pouch as compared to normal sigmoid colon were mucosal necrosis, focal erosions, inflammation and haemorrhage, muscularis mucosa fibrosis, submucosal congestion and haemorrhage, widening, fibrosis and presence of lymphoid follicles and circular and longitudinal muscle disarray and fibrosis. Also seen was a significant inflammatory infiltrate permeating all the layers of the pouch. Conclusion: CPC has histopathological abnormalities in all the layers of the colon. It is thus pathologically abnormal tissue. The widespread inflammatory reaction in all layers of the CPC raises the possibility of some environmental factor having a role in etiopathogenesis of CPC.
ABSTRACT
The different denture base materials and their processing techniques are developing in the field of removable and fixed prosthodontics. The polymers, especially acrylic resins are entered in this field more than 70 years ago and it is most widely used and material of choice around 80% world wide. Initially acrylic resins were polymerized by heat, later they developed using chemical accelerators for polymerization and termed as selfcure resins. The use of microwave energy to polymerize acrylic denture base in a 400 watt microwave oven for 2.5 minutes was reported in 1968 and properties ware discussed. The present study is designed to compare the residual monomer content in 24,48,72,96 and 120 hours periods of time and water absorption after 10 days in acrylic resin samples processed with conventional heat cure polymerization method and microwave polymerization method.
ABSTRACT
The esthetic aspect of complete denture construction is increasingly occupying an important role in prosthodontics. Denture patients desire a brand of denture esthetics closely paralleling the ideal esthetic values of the third decade of life. Many pre-extraction records will guide selection of appropriate tooth mold for each individual. These include diagnostic casts, photographs, roentgenograms, extracted teeth etc. When no pre-extraction records are available; it is difficult to select an appropriate tooth mold that can reestablish the naturalness of the individual patient. In such a scenario, various facial measurements and proportions aid in the selection of appropriate artificial tooth dimensions. The “Golden proportion”, one of the building blocks of beauty, is one such guideline that can be applied to the profession of dentistry with assured success. The aim of present study is to find out which of the facial measurements are in golden ratio with anterior teeth and that can be used for artificial teeth selection