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Results 451 - 500 of 627
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Tufts B - - 1996
In vivo experiments were carried out to determine the relative effects of carbonic anhydrase (CA) infusion or inhibition on carbon dioxide (CO2) transport and acid-base status in the arterial and venous blood of sea lampreys recovering from exhaustive exercise. Infusion of CA into the extracellular fluid did not significantly affect ...
Netuschil L - - 1995
The aim of this double-blind study was to enumerate the total number of living and dead bacteria on defined tooth areas during the application of antibacterial mouthrinses. After prophylaxis, 40 students refrained from all oral hygiene measures for 3 d, during which they rinsed with a phenolic compound (Listerine), an ...
Maze G I - - 1995
Controlled local delivery of antibiotics has been shown to reduce periodontopathic micro-organisms with minimal side-effects. Clinical studies in our laboratory have shown that 25% tetracycline HCl delivered from poly(D,L-lactide/glycolide) film strips (25 TTC-PLGA) released therapeutic concentrations of tetracycline for 10 days. The present pilot study compared the intracrevicular delivery of ...
Sotiriou M - - 1995
This in vivo study examined forces exerted during the recording of impressions of dentate maxillary arches. This study consisted of 10 subjects; four impression materials in metal stock trays and disposable plastic trays were used. The load rate and the maximum insertion and removal forces were measured with strain gauges ...
Hinrichs J E - - 1995
A reproducible and sensitive laser Doppler periodontal probe has recently been developed for intrasulcular measurement of gingival blood flow. The specific aims of this investigation were to determine the relation between intrasulcular laser Doppler readings (LDR) and traditional diagnostic criteria as well as to evaluate the response to root planning ...
Oda Y - - 1995
The antigenotoxic effects of curcumin, including the inhibition of SOS induction and mutagenesis by UV light, were investigated in Salmonella typhimurium TA1535/pSK1002 and Escherichia coli K-12 strains. Induction of the SOS gene (umuC) expression was assayed by measuring accumulated beta-galactosidase activity. We found that curcumin blocked umuC induction promoted by ...
Wanner O - - 1995
A packed bed biofilm reactor inoculated with pure culture Pseudomonas aeruginosa was run under high substrate loading and constant flow rate conditions. The 3.1-cm-diameter cylindrical reactor was 5 cm in length and packed with 1-mm glass beads. Daily observations of biofilm thickness, influent and effluent glucose substrate concentration, and effluent ...
Newcombe R G - - 1995
The efficacy of oral hygiene agents in preventing the accumulation of plaque from a zero baseline is conveniently evaluated in the 4-day plaque regrowth model. In many studies a panel of volunteers has been used to compare several agents according to a highly efficient Latin square based crossover design. Often ...
Medina F J - - 1995
The well-known technique of silver staining of the nucleolar organizer (Ag-NOR) is improved in contrast, selectivity and speed when performed with microwave irradiation. The Ag-NOR technique is a very useful tool for studies on the functional morphology and molecular architecture of the nucleolus, and is reputed to be one of ...
Hausberger A G - - 1995
PURPOSE: The objective of the reported work was to quantitatively establish gamma-irradiation dose effects on initial molecular weight distributions and in vitro degradation rates of a candidate erodible biopolymeric delivery system. METHODS: Poly(D,L-lactide-coglycolide) (PLGA) porous microparticles were prepared by a phase-separation technique using a 50:50 copolymer with 30,000 nominal molecular ...
Walsh T F - - 1995
24 adult patients suffering from Adult periodontitis were assigned to 4 groups: the 1st rinsed for 1 min with 0.2% chlorhexidine gluconate (CHX); the 2nd group were irrigated for 15 s with 0.2% CHX in a pulsed oral irrigator; the 3rd group rinsed for 1 min with saline and the ...
Pienihäkkinen K - - 1995
The aim of the study was to compare the efficacy of a 40% chlorhexidine (CHX) varnish (EC40, Certichem, Nijmegen, The Netherlands) with a 1% CHX-0.2% NaF gel in decreasing the level of salivary mutans streptococci (MS). The subjects were screened for a high level of MS using a Dentocult-SM strip ...
Perlich M A - - 1995
The effects of a stabilized 0.454% stannous fluoride dentifrice, currently marketed as Crest Gum Care, on supragingival plaque, gingivitis, gingival bleeding and oral soft tissue condition were studied in 328 adult male and female subjects who completed a six-month, double blind clinical study. Following initial examinations, subjects presenting with a ...
Imfeld T - - 1995
The aim of this investigation was to study the effect of sugar-free chewing gums containing various amounts of urea on the pH recovery in dental plaque. Three plaque-measuring methods were used, i.e., the telemetric, the microtouch, and the sampling methods. The subjects who had refrained from toothbrushing for 3-7 days ...
Moran J M - - 1995
Recent studies have suggested that a sonic electric toothbrush is more effective than a manual brush at removing extrinsic dental stain. There have been few studies of the comparative stain removal properties of different electric brushes. The study reported here was conducted to compare the efficacy of the sonic toothbrush ...
de Souza-Gugelmin M C - - 1995
The objective of the present study was to create an index for the adequate evaluation of gingival immunological defense with respect to IgA levels. The gingival immunological defense index (GIDI), which is based on the simple count of the inflamed gingival surfaces of a child plus the measurement of salivary ...
Gutiérrez J - - 1994
Alterations in phagocytosis appear to be important in the onset and development of periodontitis. We investigated new substances that may be of use in the treatment of periodontitis. In a preliminary study, we tested the effect of sodium fluoride on phagocytosis by circulating polymorphonuclear leucocytes (PMNs) in 10 replicate assays ...
Clark D C - - 1994
Dental caries in dentate elderly patients may be controlled with chlorhexidine. The purpose of this study is to establish the effectiveness of two low-concentration chlorhexidine mouthrinses in reducing the microbial counts of cariogenic bacteria in a sample of institutionalized elders. Stimulated saliva samples from all subjects before treatment produced counts ...
Kjaerheim V - - 1994
A double-blind cross-over clinical study was performed on eight volunteers to determine the plaque-inhibiting effect of different triclosan- and sodium lauryl sulfate (SLS)-containing mouthrinses. An attempt was also made to locate the binding site(s) of triclosan in the oral cavity. After the volunteers rinsed for four days with solutions of ...
Curran T M - - 1994
Fluoride at concentrations greater than 0.01 mM was found to be a quasi-irreversible inhibitor of enolase of permeabilized cells of Streptococcus mutans GS-5 and also of isolated yeast enolase. The inhibition appeared to be of the type that has been described for P-ATPases, but was not dependent on added Al3+ ...
Shibasaki K - - 1994
The effects of low molecular chitosan (LMCS) on pH responses of human dental plaque following exposure to fermentable carbohydrates were investigated by an ion-sensitive field-effect transistor electrode system. After the plaque pH values were minimized by direct application of 5% glucose solution or consumption of sugared caramel, the subjects started ...
Abbott D M - - 1994
Delmopinol, a 3-alkyl substituted N-hydroethyl morpholine, has shown potential as a mouthrinse for the management of dental plaque and treatment of gingivitis. Delmopinol has been shown to possess plaque inhibitory activity in several previous studies. The aims of this study were to: 1) compare the antiplaque, antigingivitis efficacy and safety ...
Strocchi A - - 1994
The constancy of the hydrogen consuming flora of the human colon was studied in 15 healthy subjects via two measurements obtained 18 to 36 months apart. Hydrogen disappearance rate and the major products of H2-consuming bacteria, methane and sulfide, were measured during incubation of fecal homogenates with excess hydrogen and ...
Kowitz G M - - 1994
A 2-week, three-cell study was conducted to evaluate the tooth-whitening efficacy of the Colgate Platinum Professional Toothwhitening System vs Rembrandt Gel Plus (a regimen of products consisting of a 10% carbamide peroxide gel, a whitening toothpaste, and a mouthrinse), and a placebo paste. Seventy subjects completed this parallel, single-blind, three-compartment, ...
Kimura M - - 1994
Previous studies show that the combined method using thrombolytic drugs and ultrasonic irradiation enhances the effect of thrombolysis in in vitro and in vivo experiments. However, the mechanism of the clot lysis was unclear. In previous studies the evaluation of the clot lysis effect was determined by the rate of ...
Tennakoon C L - - 1994
This paper deals with the electrochemical production of hydrogen by depolarizing the oxygen evolution reaction using human feces and urine, which contains 30-40% bacteria and yeast. The electroactivity of graphite, tungsten carbide, perovskite and RuO2-coated Ebonex (Ti4O7) as anode materials are compared. The scale-up of the process in a laboratory-scale ...
Hanioka T - - 1994
Topical application of Coenzyme Q10 (CoQ10) to the periodontal pocket was evaluated with and without subgingival mechanical debridement. Ten male patients with adult periodontitis participated and 30 periodontal pockets were selected. During the first 3 weeks, the patients did not receive any periodontal therapy except the topical application of CoQ10. ...
Nathoo S A - - 1994
A 2-week study was conducted to evaluate the tooth-whitening efficacy of Colgate Platinum Professional Toothwhitening System vs Rembrandt Lighten Bleaching Gel. Thirty-eight subjects completed this single-blind, randomized, parallel clinical study. The subjects were balanced into two groups based on a minimal shade of A3 on the Vita shade guide. The ...
Selim H A - - 1994
Bleaching is a viable treatment alternative to attempt esthetic improvement of discolored teeth. Natural tooth structure as opposed to a veneer or crown margin is considerably superior in tissue response. Caution has to be exercised in selecting cases and advising patients of the possibilities from bleaching and that bleaching may ...
Iizawa O - - 1994
Lipid peroxide levels, the activities of superoxide dismutase (SOD), catalase and glutathione peroxidase (GSH-Px), and the development of tanning in the skin of C57 BL/6 mice were assessed for long periods, from very early to late stages, after acute or chronic UVB irradiation. Acute UVB irradiation produced an increase in ...
Dahlén G - - 1993
This study has shown that microorganisms associated with caries (mutans streptococci, lactobacilli) and marginal periodontitis (Porphyromonas gingivalis, Prevotella intermedia and Actinobacillus actinomycetemcomitans) in pure culture can be stored in VMGA or reduced transport fluid and be recovered sufficiently after 24 h. Sufficient recovery after 24 h of mail transport was ...
Bay N L - - 1993
PURPOSE: The purpose of this examiner-blind investigation was to study the effect of two antimicrobial mouthrinses on the quantity and potential respiratory-penetrating ability of microorganisms generated by an air-abrasive polisher. METHODS: Forty-five adult subjects were randomly assigned to one of three groups and asked to rinse for 30 seconds with ...
Rehn Y - - 1993
The virucidal activity of the activated sludge aqueous phase was studied from the time of initial inoculation with a poliovirus type 1 suspension and for durations of three and nine days. The mixtures were incubated in presence of a nutritive medium at 26 degrees C and samples were drawn at ...
Toffler W L - - 1993
BACKGROUND: Various sampling techniques of the cervix have established false negative rates ranging from 18% to 45%. A number of studies suggest that this false negative rate can be reduced by sampling techniques that are associated with higher yields of endocervical cells. METHOD: This study enrolled 301 women, each of ...
Sarkar S - - 1993
Subgingival plaque samples from patients with chronic periodontitis were exposed to light from a 7.3 mW Helium/Neon laser for 30 s in the presence and absence of 50 micrograms/ml toluidine blue O as a photosensitizer. Viable counts of various groups and species of bacteria were carried out before and after ...
Ainamo J - - 1993
This study was designed for analysis of the discriminating power of 4 different quantifications of supragingival plaque: (1) plaque wet weight (PWW); (2) the plaque index (PlI); (3) the PLQ index measuring the coronal extension of plaque; (4) the area % of stained plaque. Different quantities of plaque were produced ...
Wall M B - - 1993
Biopulping is the solid-state fermentation of wood chips as a pretreatment for mechanical pulping processes. The two organisms that are currently of the greatest interest for biopulping are the white-rot fungi, Phanerochaete chrysosporium and Ceriporiopsis subvermispora. P. chrysosporium has been shown to successfully biopulp wood (33% energy savings; 39% improvement ...
Stephen K W - - 1993
Fluoride drops and tablets are effective caries-inhibiting agents which exercise their benefit through mainly topical means. Results of caries trials in which drops or tablets were used in the home vary from excellent to poor, depending on the compliance rates of both parents and offspring. Delivery in schools has also ...
Russo V M - - 1993
Botrytis allii and Collectotrichum dematium are onion pathogens which can infect in the field and cause decay in storage. Some phenolics can hinder development of these fungi, but the effect of cytokinins is not clear. Cytokinins (kinetin or 6-benzyladenine) or phenolics (caffeic or chlorogenic acids) were added to agar at ...
Benson B J - - 1993
The purpose of this study was to compare the ability of experienced and newly trained investigators to use the published Global Plaque Index and a newly developed Proximal/Marginal Index (PMI) that focuses on disclosed plaque at clearly defined proximal and marginal surfaces. Four independent clinical studies were performed, two with ...
Larsen I B - - 1992
The surface microhardness of specimens made of a BisGMA/TEGDMA polymer was measured before and during treatment for 60 days with phosphate buffer or phosphate-buffered esterase solution with an activity corresponding to the mean hydrolase activity of human saliva. The hardness of the buffer-treated specimens was unchanged during the incubation period, ...
Zero D T - - 1992
It is now well-accepted that the primary anti-caries activity of fluoride (F) is via topical action. The retention of F in the mouth after topical fluoride treatment is considered to be an important factor in the clinical efficacy of F. The purpose of this study was to evaluate F levels ...
Drake D R - - 1992
Our previous studies have shown that pyrophosphate (PPi), the anticalculus component of tartar-control dentifrices, inhibits the growth of organisms associated with coronal and root surface caries. The purposes of this investigation were to: 1) determine if periodontal pathogens are similarly susceptible to the growth-inhibitory properties of PPi; and 2) determine ...
Ciancio S G - - 1992
Numerous chemical agents have been evaluated for the supplementation of patient-dependent mechanical plaque control and thus the reduction or prevention of oral diseases. Agents discussed in this paper are those most frequently evaluated in recent studies and include chlorhexidine, essential oils, triclosan, sanguinarine, fluorides, oxygenating agents, quaternary ammonium agents, prebrushing ...
Nikolić L - - 1992
The influence of in vitro test conditions on the release of aspirin from commercial tablets was assessed with a USP rotating-basket dissolution apparatus. Three types of aspirin tablets were evaluated: plain, buffered, and microencapsulated. The variables investigated were stirring speed, pH, and volume and temperature of the dissolution medium. Plain ...
Varela H - - 1992
In this paper, the influence of aeration rate on the alcoholic batch fermentation of whey by Kluyveromyces fragilis NRRL Y-2415 was investigated. Assays in 1.5-L fermentor using concentrated whey permeate containing 100 g/L of lactose were carried out at different oxygen supply rate (KLaC*) from 0 to 82 mmol/Lh. Optimum ...
Grimsdottir M R - - 1992
The use of orthodontic appliances may contribute to local gingivitis, often attributed to increased plaque retention. Gingivitis of bacterial origin cannot clinically be distinguished from local tissue irritation caused by corrosion products. The purpose of this investigation was to assess the cytotoxic effect of various metallic components used in orthodontics. ...
Köhler B - - 1992
During the fall of 1987 one hundred and fifty-five 15 to 16-year-olds were examined with regard to caries prevalence, saliva secretion rate and salivary numbers of mutans streptococci and lactobacilli. In 15% of the subjects no mutans streptococci were detected, while 17.7% carried > 10(6) colony forming units (cfu) per ...
Struijk D G - - 1992
Several studies are discussed which investigated the usefulness of the disappearance rate of macromolecules from the peritoneal cavity for estimating convective fluid loss from the peritoneal cavity into the peritoneal lymphatic system. It is shown that dextrans are removed from the peritoneal cavity by a size-independent process at a mean ...
Sandham H J - - 1991
An abbreviated treatment with a chlorhexidine-containing varnish was compared with a similar treatment with a placebo varnish and with a prophylaxis alone for its effects on the numbers of detectable salivary mutants streptococci in 51 adults. The varnishes, applied once weekly for four weeks, were held in place with a ...
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