Diet Cariogenicity
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. PrevalÃncia de cÃrie e determinaÃÃo do crescimento ponderal e corporal utilizando-se a Dieta BÃsica Regional Modificada â estudo em ratos
Os objetivos da presente pesquisa foram determinar a prevalÃncia de cÃrie em molares e o crescimento ponderal e corporal de ratos (Rattus norvegicus albinus Wistar), utilizando-se a Dieta BÃsica Regional Modificada incluindo elementos nutricionais da regiÃo, acrescida ou nÃo de flÃor. Foram utilizados 60 ratos, do sexo masculino, com 23 dias de idade.
Publicado em: 2005
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2. Effect of a Brazilian regional basic diet on the prevalence of caries in rats
The aim of the present study was to determine the effect of a regional basic diet (RBD) on the prevalence of caries in the molar teeth of rats of both sexes aged 23 days. The animals were divided into six groups of 10 rats each receiving the following diets for 30 and 60 days after weaning: RBD, a cariogenic diet, and a commercial diet. The prevalence and pe
Brazilian Journal of Medical and Biological Research. Publicado em: 2002-07
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3. Colonization and cariogenicity of Streptococcus ferus in rats.
Streptococcus ferus, which is indigenous to wild rats, is a member of the mutans group of streptococci. We tested its ability to colonize and to cause caries in laboratory rats by comparing two strains of S. ferus with the very cariogenic Streptococcus sobrinus strain 6715. Groups of rats were fed either finely ground mouse chow or a 56% sucrose diet, or the
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4. Virulence of Streptococcus mutans: comparison of the effects of a coupling sugar and sucrose on certain metabolic activities and cariogenicity.
A coupling sugar preparation (sucrose-free [CSSF]), which contains a mixture of sugars, oligosaccharides, and oligosaccharides terminated at the reducing end by sucrose, served as a substrate for growth and acid production by Streptococcus mutans 6715. However, CSSF was a poor substrate for cellular aggregation, glucosyltransferase activity, plaque formation
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5. Non-cariogenicity of the disaccharide palatinose in experimental dental caries of rats.
The caries-inducing activity of palatinose (isomaltulose, alpha-D-glucopyranosyl-1,6-fructose) was examined in in vitro and in vivo experiments, comparing it with other carbohydrates. When Streptococcus mutans was successively subcultured in a broth medium containing 1% palatinose, the strains belonging to serotype a, d, or g did not ferment palatinose, wher
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6. Virulence of Streptococcus mutans: a sensitive method for evaluating cariogenicity in young gnotobiotic rats.
Gnotobiotic rats infected with Streptococcus mutans 6715 at 19 days of age and fed a purified diet (305) containing 5% sucrose developed extensive caries lesions on all molar surfaces within 16 days (35 days of age). Approximately twice as many lesions developed when infected rats were maintained until 45 days of age, whereas noninfected rats did not develop
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7. Characterization of Recombinant, Ureolytic Streptococcus mutans Demonstrates an Inverse Relationship between Dental Plaque Ureolytic Capacity and Cariogenicity
Dental caries results from prolonged plaque acidification that leads to the establishment of a cariogenic microflora and demineralization of the tooth. Urease enzymes of oral bacteria hydrolyze urea to ammonia, which can neutralize plaque acids. To begin to examine the relationship between plaque ureolytic activity and the incidence of dental caries, recombi
American Society for Microbiology.
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8. Virulence of a spaP Mutant of Streptococcus mutans in a Gnotobiotic Rat Model
Streptococcus mutans, the principal etiologic agent of dental caries in humans, possesses a variety of virulence traits that enable it to establish itself in the oral cavity and initiate disease. A 185-kDa cell surface-localized protein known variously as antigen I/II, antigen B, PAc, and P1 has been postulated to be a virulence factor in S. mutans. We showe
American Society for Microbiology.
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9. Isolation and immunobiological classification of Streptococcus sanguis from human tooth surfaces.
A total of 113 pure cultures of Streptococcus sanguis were obtained from dental plaque samples of 64 subjects. All isolates synthesized glucan from sucrose, elaborated peroxide, and were alpha-hemolytic. Two biotypes and four serotypes were differentiated within the species. Biotype A (95 isolates) fermented salicin and inulin and hydrolyzed arginine and esc
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10. Characteristics and cariogenicity of a fructanase-defective Streptococcus mutants strain.
Polymers of D-fructose produced by a variety of oral bacteria are believed to function as extracellular carbohydrate reserves. Degradation of these polysaccharides in plaque following exhaustion of dietary carbohydrates is thought to contribute to the extent and duration of the acid challenge to the tooth surface and thus to the initiation and progression of
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11. Virulence of Streptococcus mutans: cariogenicity of S. mutans in adult gnotobiotic rats.
Gnotobiotic rats infected with Streptococcus mutant 6715, mutans C211 at 45 days of age on provided a purified diet containing 5% sucrose developed carious lesions on buccal, sulcal, and proximal molar surfaces within 15 days (60 days of age). The level of caries increased significantly (P less than or equal to 0.01) within the next 15 days (by day 75), an e
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12. Molecular analysis of a Streptococcus mutans strain exhibiting polymorphism in the tandem gtfB and gtfC genes.
Streptococcus mutans UA101, which was previously demonstrated to be highly cariogenic in gnotobiotic rats, exhibited much lower water-insoluble glucan (IG) synthetic activity compared with that of S. mutans GS5 and was unable to express sucrose-dependent colonization of smooth surfaces in vitro. On the basis of Southern and Western blot (immunoblot) analyses