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Biomedical subjects

H W Kaufman

Publications and source records attributed to H W Kaufman.

At least 19 recordsLinked to original sources
PubMed1999

Clinical evaluation of the effect of a remineralizing toothpaste on dentinal sensitivity.

Dentinal hypersensitivity is a common dental problem without a satisfactory solution. Most therapies have focused on either trying to block the stimulation of dentinal nerves or on sealing open dentinal tubules. This study evaluated, in a double blind clinical trial, the effect of Enamelon, a dentifrice containing sodium fluoride, calcium salts and phosphate salts (calcium separated from the phosphate and fluoride by a plastic divider in the tube to prevent interaction) on dentinal hypersensitivity over an 8-week period. A conventional OTC dentifrice containing NaF without calcium and phosphate enhancement served as the control. A third dentifrice, containing sodium monofluorophosphate enhanced by calcium and phosphate salts, was also tested. Based upon subjective anecdotal information, net numbers of sensitive teeth which became non-sensitive, and a logit analysis of the change in the proportion of sensitive teeth over the study time period, Enamelon was the most effective product, and the OTC control the least effective.

Analysis of Variance↗
PubMed1997

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Clinical Laboratory Information Systems↗
PubMed1994

Measurement of tooth hypersensitivity and oral factors involved in its development.

The various methods of measurement of dentinal hypersensitivity are based upon the types of stimuli used to elicit a pain response in teeth, which include thermal, tactile, evaporative, electrical and osmotic. Pulpal inflammation in its early stages reduce the threshold of pain response to these stimuli but electrical stimulation may make it possible to assess the possible contribution of such inflammation to sensitivity determinations. Although the magnitude of each stimulus is quantifiable, patient response is subjective, which necessarily makes measurements of dentinal sensitivity semisubjective. Various methods of testing dentinal sensitivity are discussed, along with their advantages and disadvantages. The teeth most suited for measurement in clinical studies are the canines and premolars. This is because approx. 80% of the sensitivity lesions are associated with these teeth, which have similar thicknesses of root dentine. Data from several studies involving the same subjects indicate that individual measurements readily return to baseline and that the commonly seen placebo effect is probably due to some as yet unidentified factor in desensitizing formulations. Possible roles of salivary and plaque environmental factors in the development of dentinal sensitivity are discussed, as well as methods for their measurement.

Beverages↗
PubMed1994

Design and statistical aspects of the management of clinical trials to assess antihypersensitivity product efficacy.

This paper discusses the design of clinical trials for testing the efficacy of therapeutic products for hypersensitive teeth with emphasis on statistical considerations. The preparation of a proper protocol is essential to the successful outcome of any clinical study. Key considerations in this regard are the criteria for patient selection, the size of the sample, the method of stratification of subjects into various test and control groups, the methods to be used for assessing sensitivity, and the statistical treatment of the data generated. The importance of other factors such as the requirement for a quiet, relaxed atmosphere and allowing adequate time for the examiner to establish a rapport with the subject, and the need to comply with institutional review board regulations, are stressed.

Analysis of Variance↗
PubMed1992

Use of multiple sensitivity measurements and logit statistical analysis to assess the effectiveness of a potassium-citrate-containing dentifrice in reducing dentinal hypersensitivity.

A potassium citrate-SMFP containing dentifrice was tested in a double-blind 8-week clinical trial on subjects with a history of dentinal hypersensitivity. A dentifrice containing SMFP but no potassium salt was used as the control and a 2nd test dentifrice containing potassium nitrate-SMFP was assessed at the same time. The sensitivity of the subjects was evaluated at 0, 3 and 8 weeks using electrical and tactile methods plus a 1-s air blast. The sensitivity scores for each subject at each examination were summarised as a proportion of the examined teeth deemed sensitive. Assessment of any effects of the dentifrices was via an analysis of covariance of the logit transformation of these proportions with the baseline value as the covariate. The use of this novel method of analysis had the advantage of taking into account changes in sensitivity of all of the teeth, both sensitive and non-sensitive, since electrical measurements indicated effects on both. Of the original 120 subjects, 111 completed the trial and the 3 dentifrice groups remained well balanced for age, sex and sensitivity. All 3 dentifrice groups showed statistically significant reductions in sensitivity over the 8 weeks. However, the potassium citrate-SMFP dentifrice was significantly more effective than either the control SMFP dentifrice, or the potassium nitrate-SMFP dentifrice, at reducing sensitivity after 3 weeks, and this difference plus further sensitivity reduction with all 3 dentifrices was observed after 8 weeks.

Adolescent↗
PubMed1992

Pilot study comparing the salivary cationic protein concentrations in healthy adults and AIDS patients: correlation with antifungal activity.

This investigation compared the salivary cationic protein concentrations of 12 healthy adult controls with those of 12 hospitalized patients with AIDS. Salivas were quantified by capillary electrophoresis using purified cationic protein standards. In parotid saliva, histidine-rich polypeptides (HRPs) 1-6, histatin 6, and lysozyme concentrations were determined. In addition to these eight cationic proteins, submandibular-sublingual saliva was also quantified for histatin 2 and the histatin 2 degradation product. When comparisons were made on the basis of individual proteins, the HRP-histatin concentrations in the AIDS patients showed either statistically significant decreases or a decreasing trend compared with healthy adult controls. When HRP-histatin concentrations were summed for each patient, there were statistically significant differences between the healthy adult controls and the individuals with AIDS in both parotid and submandibular-sublingual salivas. Closer examination revealed that some individuals with AIDS had HRP-histatin concentrations that fell within the normal range of the healthy adult controls. For these individuals, lower than expected salivary antifungal values were obtained. Either decreasing histidine-rich protein concentrations and/or an inability of these proteins in saliva to interact with Candida albicans may contribute to the defective salivary antifungal activity seen in AIDS patients.

Acquired Immunodeficiency Syndrome↗
PubMed1992

Determination of salivary anticandidal activities in healthy adults and patients with AIDS: a pilot study.

This investigation compared the salivary anticandidal activities of 12 healthy adults with 12 hospitalized patients with AIDS. Stimulated parotid, submandibular-sublingual, and whole salivas were collected during a period of 10 min, immediately acidified, boiled, and then centrifuged to isolate salivary supernatants. Supernatants were then tested for antifungal activity against Candida albicans in blastospore viability inhibition and germ tube formation assays. A unit of blastospore or germ tube antifungal activity was established as that activity yielding 90% or greater inhibition during a defined time period in each salivary assay. Each of the patients with AIDS were found to be defective in one or more of their salivary antifungal activities, and in comparison with healthy adults the differences in antifungal units per milliliter of saliva and total antifungal units were statistically significant for each saliva and each antifungal assay. Defective salivary antifungal activity may contribute to the oral candidiasis seen in patients with AIDS.

Acquired Immunodeficiency Syndrome↗
PubMed1991

Caries prevalence, treatment level, and sealant use related to school lunch program participation.

A total of 2,753 schoolchildren (8-11 years old) from two school districts received visual-tactile examinations for caries. The school districts were approximately 15 miles apart and located in fluoride-deficient (F less than 0.3 ppm) Long Island, New York. The higher socioeconomic community (HSES) had 9.2 percent of its students enrolled in the free or reduced-payment school lunch program; the lower socioeconomic community (LSES) had 50.3 percent enrolled. The LSES community had a higher caries prevalence, more untreated lesions, fewer caries-free children, and fewer children treated with sealants. School lunch programs provide an index to identify communities for dental programs.

Child↗
PubMed1990

How reliably can compact chemistry analyzers measure lipids?

Five compact chemistry analyzers were evaluated for the measurement of lipids. Fresh plasma or serum specimens from a standardized research laboratory were assayed for total cholesterol on all five analyzers. Triglycerides and high-density lipoprotein cholesterol were assayed on the three analyzers that could measure both of these analytes. Study results were interpreted by assessing accuracy and precision and by defining the percentage of patient specimens classified in the same categories as the reference laboratory, according to National Cholesterol Education Program guidelines. Two analyzers met standards for accuracy of cholesterol measurement. Three analyzers met performance standards for precision of cholesterol measurement. Agreement with National Cholesterol Education Program classification of specimens compared with the reference laboratory for total cholesterol ranged from 73% to 96% and was less for indirect low-density lipoprotein cholesterol. We conclude that under controlled conditions, compact chemistry analyzers vary in the reliability of lipid determination and classification of patients.

Autoanalysis↗