urease/تسوس سني

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[Influence of urease activity of the oral cavity and oropharynx on 13C-urea breath test].

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We examined whether 13C-urea breath test with powdered 13C-Urea is affected with urease activity in the oral cavity and oropharynx in H. pylori negative cases. We also examined whether the degree of gargling affects the results of 13C-UBT. The results demonstrated that the urease activity not only

[A study of urease activity of mouth cavity microflora].

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OBJECTIVE Analysis of the prevalence of mouth cavity urealytic microflora and determination of the level of its enzymatic activity depending on concentration and amount of urea solution taken as a substrate. METHODS 62 randomly chosen patients at the age of 5-64 took part in the study. Each of them

Urease activity as a risk factor for caries development in children during a three-year study period: a survival analysis approach.

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Recent cross-sectional studies suggest that reduced ability to generate alkali via the urease pathway in dental plaque may be an important caries risk factor, but it has not been assessed prospectively. OBJECTIVE To evaluate the effect of plaque and saliva urease activity on the risk for developing

Caries-free subjects have high levels of urease and arginine deiminase activity.

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OBJECTIVE This study investigated the relationship between urease and arginine deiminase system (ADS) activities and dental caries through a cross-sectional study. METHODS Urease and ADS activities were measured in saliva and plaque samples from 10 caries-free subjects and 13 caries-active. Urease

The relationship between dental caries status and dental plaque urease activity.

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BACKGROUND Ammonia production from the metabolism of urea by urease enzymes of oral bacteria moderates plaque acidification and may inhibit dental caries, as suggested by in vitro studies and indirect clinical observations. The objective of this study was to examine the relationship of urease

Salivary Urease and ADS Enzymatic Activity as Endogenous Protection against Dental Caries in Children.

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The aim of this cross sectional study was to evaluate the ureolytic and arginolytic activities of saliva in children and associate them with their caries status. METHODS 65, 8 year old children, were randomly selected. The ureolytic and arginolytic activity of non stimulated saliva was studied and

Urease activity in dental plaque and saliva of children during a three-year study period and its relationship with other caries risk factors.

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Bacterial urease activity in dental plaque and in saliva generates ammonia, which can increase the plaque pH and can protect acid-sensitive oral bacteria. Recent cross-sectional studies suggest that reduced ability to generate ammonia from urea in dental plaque can be an important caries risk

Effect of urease inhibition on calculus formation and caries development in the rat.

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Molecular Dynamics Study of Helicobacter pylori Urease.

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Helicobacter pylori have been implicated in an array of gastrointestinal disorders including, but not limited to, gastric and duodenal ulcers and adenocarcinoma. This bacterium utilizes an enzyme, urease, to produce copious amounts of ammonia through urea hydrolysis in order to survive the harsh

Testudinibacter aquarius gen. nov., sp. nov., a member of the family Pasteurellaceae isolated from the oral cavity of freshwater turtles.

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A total of 13 Pasteurellaceae isolates from healthy freshwater turtles were characterized by genotypic and phenotypic tests. Phylogenetic analysis of partial 16S rRNA and rpoB gene sequences showed that the isolates investigated formed a monophyletic group. The closest related species based on 16S

Isolation and classification of anaerobic bacteria from pulp cavities of nonvital teeth in man.

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The anaerobic microflora of infected pulp cavities and chronic periapical abscesses was studied. A total of 19 infected nonvital teeth were subjected to this study. The coronal surface was swabbed with 70% ethanol to remove debris and to disinfect. Material in root canal chamber was obtained by

Genetic variation of Helicobacter pylori in the oral cavity and stomach detected using thymine adenine cloning in children with chronic gastritis.

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OBJECTIVE To investigate the DNA sequence variations of Helicobacter pylori in the oral cavities and stomachs of children with chronic gastritis. METHODS Dental plaques and gargle on 235 patients were obtained before gastroscopy. Gastric H. pylori infection was diagnosed using rapid urease test or

Urease Inhibition in the Presence of N-(n-Butyl)thiophosphoric Triamide, a Suicide Substrate: Structure and Kinetics.

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The nickel-dependent enzyme urease is a virulence factor for a large number of pathogenic and antibiotic-resistant bacteria, as well as a negative factor for the efficiency of soil nitrogen fertilization for crop production. The use of urease inhibitors to offset these effects requires knowledge, at

Analysis of urease expression in Actinomyces naeslundii WVU45.

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The hydrolysis of urea by ureases of oral bacteria in dental plaque can cause a considerable increase in plaque pH, which can inhibit the development of dental caries. There is also indirect evidence that urea metabolism may promote the formation of calculus and that ammonia release from urea could

Construction and characterization of a recombinant ureolytic Streptococcus mutans and its use to demonstrate the relationship of urease activity to pH modulating capacity.

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To begin to understand the contribution of oral microbial ureolysis to the inhibition of dental caries, we sought to construct a recombinant, ureolytic mutans streptococcus and correlate the ureolytic capacity of plaque bacteria with pH moderating ability. Streptococcus mutans GS-5 was transformed

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