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Biomedical subjects

H O Heymann

Publications and source records attributed to H O Heymann.

At least 55 records · Page 3Linked to original sources
PubMed1991

Nightguard vital bleaching: how safe is it?

The conservative technique for bleaching vital teeth using a nightguard and a 10% carbamide peroxide solution has captured the esthetic interests of the dental profession. The purpose of this article is to assess the safety of the products used in this bleaching technique based on results from past related research and current research. Ten percent carbamide peroxide solutions used in numerous studies have demonstrated tissue-healing properties as well as a propensity for the reduction of plaque and gingivitis. None of these clinical studies revealed any untoward or detrimental side effects, and all demonstrated beneficial effects. Although some concern exists regarding the potentiating effects of peroxide solutions in the presence of known carcinogens, concerns of toxicity or damage to hard and soft tissues appear unfounded. The majority of current and past research and literature indicates that the current use of a 10% carbamide peroxide solution in the method advocated for bleaching vital teeth is apparently safe when administered properly under the supervision of a dentist.

Carbamide Peroxide↗
PubMed1990

Nightguard vital bleaching: effects on enamel surface texture and diffusion.

A recently reported technique for bleaching vital discolored teeth involves the use of a mouthguard and 10% carbamide peroxide without preoperative etching or postoperative polishing of the enamel. This in vitro study evaluated the effects of the bleaching agent on the surface texture of the enamel. Thirty-three extracted teeth were subjected to 10% carbamide peroxide for a period equivalent to 5 weeks of nighttime wear. A control area on each tooth had been covered and sealed. All discolored teeth experienced lightening, but there was no difference in color between the treated and control areas; the color-changing effects apparently extend to portions of the tooth not in direct contact with the solution. Epoxy replicas of the teeth were examined under a scanning electron microscope. No etching was apparent, and no difference in surface texture between treated and control areas was detected.

Bicuspid↗
PubMed1989

Effects of water, speed, and experimental instrumentation on finishing and polishing porcelain intra-orally.

Previous studies indicated that porcelain can be polished smoother than glazed porcelain with instruments suitable for intra-oral use. This study evaluated several experimental instruments and materials to determine if polishing could be done more efficiently. Scanning electron microscopy was used to evaluate the surface texture produced by different combinations of experimental instruments applied with high and moderate speed, wet and dry, to porcelain disks. No sequence matched the polished standard. However, the optimum surface texture was obtained with diamond instruments (with progressively smaller particle sizes) used at a moderate speed with water, followed by a 30-fluted carbide bur at high speed and dry, then diamond polishing paste on a webbed rubber cup. In all polishing sequences tested, the best results were obtained with each individual instrument when diamond instruments were used at moderate speed wet, and when carbide instruments were used at high speed dry.

Dental Polishing↗
PubMed1989

A posterior composite teaching programme for the undergraduate.

The development and existing arrangements in respect of the undergraduate teaching programme for posterior composites at the University of North Carolina School of Dentistry are reviewed. The importance of a unified departmental and school policy, associated clinical research activities and continuing education in relation to undergraduate teaching of posterior composites is stressed.

Bicuspid↗
PubMed1988

Twelve-month clinical study of dentinal adhesives in class V cervical lesions.

Recently, numerous resin systems claiming dentinal adhesive properties have been introduced. This study evaluated the clinical performance of two such adhesive resins in seven various material and technique combinations without conventional cavity-retention features. To identify potential risk factors in regard to retention, nonmaterial- and technique-related variables such as patient age and occlusion were also evaluated.

Adhesives↗
PubMed1987

The artistry of conservative esthetic dentistry.

Restorative dentistry, especially esthetic techniques, demands the dentist be artist and scientist. Artistic elements such as shape of form, symmetry and proportionality, position and alignment, surface texture, and color must be considered. Conservative esthetic dentistry provides a new dimension to treatment that is rewarding and gives the dentist another means of artistic expression.

Color↗
PubMed1979

Effectiveness of project ACORDE materials: applied evaluative research in a preclinical technique course.

Two instructional strategies, the traditional lecture method and a standardized self-instructional (ACORDE) format, were compared for efficiency and perceived usefulness in a preclinical restorative dentistry technique course through the use of a posttest-only control group research design. Control and experimental groups were compared on (a) technique grades, (b) didactic grades, (c) amount of time spent, (d) student and faculty perceptions, and (e) observation of social dynamics. The results of this study demonstrated the effectiveness of Project ACORDE materials in teaching dental students, provided an example of applied research designed to test contemplated instructional innovations prior to use and used a method which highlighted qualitative, as well as quantitative, techniques for data gathering in applied research.

Attitude↗