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Biomedical subjects

H Cooper

Publications and source records attributed to H Cooper.

89 records · Page 5Linked to original sources
PubMedDate not supplied

Antimicrobial properties of dental dentin-enamel adhesives.

This study evaluated the antimicrobial activity of Universal Bond II adhesive and two experimental versions of Universal Bond II adhesives against the bacteria, Streptococcus mutans. The zones of bacterial inhibition produced by three samples of the adhesive (identified as Batches 1, 2, and 3) were measured and compared. Batch 1 contained 0.7% glutaraldehyde, Batch 2 contained 1.0% glutaraldehyde, and Batch 3 contained 0.45% glutaraldehyde (current Universal Bond II adhesive). The bacteria was swabbed over the surface of agar plates in two directions. The plates were divided into the following two groups: Group I-Batches 1, 2, 3 were placed into wells for 1 minute before being cured. Group II-Batches 1, 2, 3 were placed into wells for 20 seconds before being cured. Zones of microbial inhibition were measured in millimeters at the end of 24, 48, and 72 hours. All batches of the adhesive produced zones of inhibition against S. mutans. All batches of the adhesive maintained zones of inhibition throughout the 72 hours of the study.

Adhesives↗
PubMedDate not supplied

Clinical technique for an in-office porcelain modification.

All porcelain restorations, especially intra- and extracoronal restorations, have become an accepted treatment modality for the esthetic restoration of posterior teeth. One problem with these restorations is the limited ability to modify the porcelain when a proximal contact is not present or there is an open margin. Using a low-fusing porcelain in a glazing oven, practitioners can easily accomplish such modifications during the try-in and cementation appointment for porcelain inlays. This technique eliminates the need for returning the porcelain inlay to the laboratory for modification and a second patient visit to complete the restoration. This paper describes an in-office procedure for modifying porcelain restorations and a scanning electron micrographic evaluation of the etched porcelain surface after using this modification technique.

Acid Etching, Dental↗
PubMedDate not supplied

At-home bleaching system: effects on enamel and cementum.

An analysis by scanning electron microscopy was undertaken to investigate the effects of bleaching on enamel-cementum surface morphology. Teeth were investigated in five groups: control; vital bleached for 5, 15, and 30 days; and 37 percent phosphoric acid gel etched for 20 seconds. Only the gel-etched group exhibited etching patterns. Shade change in vital bleached teeth was noted in the group vital bleached for 30 days.

Dental Cementum↗
PubMedDate not supplied

At-home bleaching system: effect on gingival tissue.

This study evaluated the effects of an at-home vital bleaching system on gingival responses over a 6-week period. Objective measures were utilized to measure and monitor gingival inflammation over this period of time. Vital bleaching was performed as follows: (1) bleaching gel in a prefabricated mouthguard and (2) an ad-mix technique--bleaching gel and toothpaste in a 1:1 ratio. In addition a control group used a placebo in a prefabricated mouthguard. The at-home vital bleaching system produced no adverse gingival tissue responses. Furthermore, the at-home vital bleaching system helped produce a therapeutic effect on inflamed gingival tissues over the course of the study.

Adult↗
PubMedDate not supplied

Sensitivity study in vivo: glass-ionomer versus zinc-phosphate bases beneath amalgam restorations.

This study in vivo evaluated the sensitivity of class 1 and 2 amalgam restorations which had bases of either zinc phosphate or an admix, silver-reinforced glass ionomer. The evaluation of sensitivity was done by providing the patient with five postcard questionnaires to be mailed to the clinic over a period of time from one to 28 days. Teeth restored with amalgam and silver-reinforced glass ionomer were significantly less sensitive to cold than those restored with amalgam and zinc phosphate.

Dental Amalgam↗
PubMedDate not supplied

Anodontia of the permanent dentition: fourteen years after initial diagnosis.

The congenital absence of teeth, total anodontia, may involve both the primary and permanent dentitions. This paper updates the dental history of a twenty-eight-year-old Greek-American woman first reported in 1977 by Herman and Moss, when she was fourteen. Five complete sets of dentures had been made for her in thirteen years. Treatment was more complex due to an underdeveloped maxilla and a prognathic mandible.

Adult↗
PubMedDate not supplied

Simple apicoectomy.

Explore the source record for details and available documents.

Apicoectomy↗
PubMedDate not supplied

The systematic assessment of variations in medical practices and their outcomes.

The Health Care Financing Administration of the Department of Health and Human Services has carried out for several years the systematic assessment of variations over time and among geographic locales in patterns of care and patterns of outcomes experienced by Medicare beneficiaries. This routine monitoring focuses principally on hospitalizations and their outcomes (death and readmission) and is based on the Medicare enrollment file and the claims file for inpatient care. The period 1985-88 has been marked by declining adjusted post-admission risks for mortality (down 4 percent) and readmission (down 6 percent) for Medicare beneficiaries. The downward trend in mortality risks is most evident following hospitalizations for acute myocardial infarction (down 8 percent) and stroke (down 12 percent). Hospital admission and population mortality rates, adjusted for differences in demographic and socioeconomic characteristics of the populations, vary substantially among areas as large as States and Metropolitan Statistical Areas, as do risk-adjusted post admission probabilities of death among those areas and among hospitals. Thus, if overall admission and mortality rates in the upper three quartiles of Metropolitan Statistical Areas were brought down to the average of the lowest quartile, there would be 20 percent fewer admissions and 12 percent fewer deaths within 180 days of admission for hospitalized patients. Although favorable trends in the effectiveness of the hospital care received by Medicare beneficiaries appear discernible, the existence of substantial variations suggests that further improvement may be possible.

Centers for Medicare and Medicaid Services, U.S.↗