This study aimed to quantitative evaluate the implantation of paca’s peritoneum, a new biomaterial option, preserved in 300% supersaturated sugar solution or 98% glycerin on the abdominal wall of Wistar rats. 60 male...This study aimed to quantitative evaluate the implantation of paca’s peritoneum, a new biomaterial option, preserved in 300% supersaturated sugar solution or 98% glycerin on the abdominal wall of Wistar rats. 60 males, weighing between 150 and 200 g, are organized into the following experimental groups: control group (GI);group peritoneum preserved in 300% supersaturated sugar solution (GII);and group peritoneum preserved in 98% glycerin (GIII). Each group had 20 animals. Five rats from each group underwent euthanasia at four different moments: 7th, 15th, 30th, and 60th post-operatory day for histological and stereological evaluations of the graft/native tissue interface. On histological examination, one found out an extensive presence of inflammatory infiltrate at the early periods (7th and 15th day) and an extensive presence of connective tissue at the late moments (30th and 60th day). Through stereological analysis, one found out that the number of mononuclear cells decreased throughout the evaluation moments. One concluded that the paca’s peritoneum as a biological membrane preserved in 98% glycerin, when implanted on the abdominal wall of rats, microscopically allowed one to obtain, through stereological analyses, a lower inflammatory response than the paca’s peritoneum preserved in 300% supersaturated sugar solution.展开更多
Aim: The purpose of this study was to assess chlorhexidine effects on plaque index and salivary levels of mutans streptococci (MS) when used as the immersion solution for removable orthodontic appliances and added to ...Aim: The purpose of this study was to assess chlorhexidine effects on plaque index and salivary levels of mutans streptococci (MS) when used as the immersion solution for removable orthodontic appliances and added to their acrylic resin composition. Methods: Forty-five patients (6 to 12 years old) were randomly assigned into three groups with 15 patients each. Group I (control)—without orthodontic appliances disinfection;Group II—removable orthodontic appliances which had been immersed in 0.12% chlorhexidine digluconate overnight (8 hours), and Group III—orthodontic appliances in which 0.12% chlorhexidine digluconate solution had been incorporated into their resin composition. Saliva was collected for quantification of MS and evaluation of plaque index was performed before and after installation of orthodontic appliance at 0, 2, 4, 6, 8, and 10 weeks. Data were analyzed by using analysis of variance. Results: Number of MS colonies in saliva and plaque index showed no statistically differences among groups at the different periods (p > 0.05). Conclusions: It could be concluded that chlorhexidine incorporation into the acrylic resin of removable orthodontic appliances at 0.12% concentration and immersion of the appliance into 0.12% chlorhexidine solution were not effective in reducing plaque index and the number of MS in saliva.展开更多
文摘This study aimed to quantitative evaluate the implantation of paca’s peritoneum, a new biomaterial option, preserved in 300% supersaturated sugar solution or 98% glycerin on the abdominal wall of Wistar rats. 60 males, weighing between 150 and 200 g, are organized into the following experimental groups: control group (GI);group peritoneum preserved in 300% supersaturated sugar solution (GII);and group peritoneum preserved in 98% glycerin (GIII). Each group had 20 animals. Five rats from each group underwent euthanasia at four different moments: 7th, 15th, 30th, and 60th post-operatory day for histological and stereological evaluations of the graft/native tissue interface. On histological examination, one found out an extensive presence of inflammatory infiltrate at the early periods (7th and 15th day) and an extensive presence of connective tissue at the late moments (30th and 60th day). Through stereological analysis, one found out that the number of mononuclear cells decreased throughout the evaluation moments. One concluded that the paca’s peritoneum as a biological membrane preserved in 98% glycerin, when implanted on the abdominal wall of rats, microscopically allowed one to obtain, through stereological analyses, a lower inflammatory response than the paca’s peritoneum preserved in 300% supersaturated sugar solution.
文摘Aim: The purpose of this study was to assess chlorhexidine effects on plaque index and salivary levels of mutans streptococci (MS) when used as the immersion solution for removable orthodontic appliances and added to their acrylic resin composition. Methods: Forty-five patients (6 to 12 years old) were randomly assigned into three groups with 15 patients each. Group I (control)—without orthodontic appliances disinfection;Group II—removable orthodontic appliances which had been immersed in 0.12% chlorhexidine digluconate overnight (8 hours), and Group III—orthodontic appliances in which 0.12% chlorhexidine digluconate solution had been incorporated into their resin composition. Saliva was collected for quantification of MS and evaluation of plaque index was performed before and after installation of orthodontic appliance at 0, 2, 4, 6, 8, and 10 weeks. Data were analyzed by using analysis of variance. Results: Number of MS colonies in saliva and plaque index showed no statistically differences among groups at the different periods (p > 0.05). Conclusions: It could be concluded that chlorhexidine incorporation into the acrylic resin of removable orthodontic appliances at 0.12% concentration and immersion of the appliance into 0.12% chlorhexidine solution were not effective in reducing plaque index and the number of MS in saliva.
