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Biomedical subjects

P L Fan

Publications and source records attributed to P L Fan.

At least 19 recordsLinked to original sources
PubMed1992

Environmental hazard evaluation of amalgam scrap.

Amalgam scrap was subjected to two different Environmental Protection Agency (EPA) extraction procedures to determine if it presents an environmental hazard. The results indicate that concentrations of mercury and silver in the extracts do not exceed the EPA's maximum allowable concentrations. It was concluded that amalgam scrap is not a hazardous solid waste. Proper handling of amalgam scrap disposal by recycling is, however, highly recommended.

Copper↗
PubMed1991

Porcelain repair materials. Council on Dental Materials, Instruments and Equipment.

Porcelain repair materials, when properly chosen and used, provide some bond strength in bonding to porcelain. The bond strength is decreased by thermocycling and long-term storage in water. Currently available products are affected differently by these conditions. Surface roughening by rotary instruments and chemical etching by hydrofluoric acid or APF enhances the bond strength. The long-term clinical performance of the porcelain repair materials is not well documented. The council is preparing guidelines to evaluate these materials under the Acceptance Programs of the council. These guidelines will include requiring information on the laboratory and chemical data on these products to demonstrate their safety and efficacy.

Acid Etching, Dental↗
PubMed1988

Safety of amalgam.

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Dental Amalgam↗
PubMed1987

Irradiance of visible light-curing units and voltage variation effects.

The irradiance in the wavelength of 450 to 500 nm of nine visible light-curing units was measured at 120 V input voltage. The highest irradiance was more than 20 times that of the lowest. Irradiance was also measured at 90 to 130 V input. Irradiance and depth of cure at lower input voltages were also examined.

Chemical Phenomena↗
PubMed1987

Radiopacity of light-cured posterior composite resins.

Radiographic images of teeth and restorations were used to evaluate the radiopacity of 11 light-cured posterior composite resins. The radiopacity of these composite resins provided enough variation on radiographs so that clinicians distinguished the images of the restoration from adjacent tooth structure.

Aluminum↗
PubMed1987

Ceramics: their place in dentistry.

A transfer molded ceramic coping material, Cerestore, and a castable ceramic, Dicor, are commercially available for fabrication of all-ceramic crowns. The manufacturers indicate their use should be in single unit anterior or posterior crowns. Tooth preparations are similar and should have rounded lines angles to avoid sharp points which may cause stress concentration. The amounts of tooth reduction are also similar and range from 1.0 to 2.0 mm depending on the location of surfaces. There are variations in fabricating procedures but both involve heat treatment and special equipment. Cerestore requires eventual veneer build-up and shading. Dicor requires surface shading. Both are evaluated and classified by the Council on Dental Materials, Instruments and Equipment of the American Dental Association. At least three other ceramic systems are being developed but are not yet commercially available.

Aluminum Oxide↗
PubMed1987

Safety of amalgam.

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American Dental Association↗
PubMed1986

Evaluation of light transmission characteristics of protective eyeglasses for visible light-curing units.

Eyeglasses with protective filters are recommended for users of visible light-curing units to decrease the intensity of blue light reaching the eyes. The transmission curves of 20 commercially available filter glasses are obtained. The irradiance from eight curing units through these glasses is measured. The reduction in irradiance through the filter glasses is related to the transmission curves.

Evaluation Studies as Topic↗