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Biomedical subjects

W Scherer

Publications and source records attributed to W Scherer.

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

New subgingival restorative procedures with Geristore resin ionomer.

In an ongoing search for new and improved dental materials, researchers have developed restorative products which are improved versions of traditional formulations. This has been especially true in the area of glass ionomers. One such modification has been the development of a material, termed resin ionomer. This material is less technique sensitive and exhibits low oral solubility; it may be light activated and finished at the time of placement. This article presents the clinical application of such a material with emphasis on its use in subgingival and periodontal applications.

Composite Resins↗
PubMedDate not supplied

Alcohol-containing mouthwasheses: effect on composite color.

This study investigated whether commercially available mouthwashes could affect or change the color of a hybrid composite resin. Twenty-four disks were fabricated and divided into eight equal groups for testing. At baseline, six colorimetric recordings and color parameters (L*, a*, b*) were recorded for each grouping of disks using a Chroma Meter CR-300 in reflectance mode. The groups of disks were immersed in their respective mouthwashes for 2 minutes a day in a vibratory fashion over a 6-month period. At the end of 6 months, color differences, delta E, were calculated between the base line and test recordings. The results indicate that rinsing with mouthwashes for 6 months can cause a hybrid resin to undergo color variations. Except for one product the color variations were not clinically significant.

Alkaloids↗
PubMedDate not supplied

A comparison of antimicrobial activity of etchants used for a total etch technique.

The purpose of this study was to determine the antimicrobial activity of eight commercially available etchant materials and positive and negative controls as they came into contact with bacteria commonly found within the oral cavity. The following bacteria were used in this study: Streptococcus mutans, Streptococcus salivarius, and Actinobacillis actinomycetocomitants. The study was conducted in two parts: Part I--Etchants and controls placed within wells in agar plates; Part II--Enamel-dentin disks saturated with the etchants for 20 seconds and placed on the agar plates with the controls. Zones of microbial inhibition were measured in millimeters after 48 hours. The results of the study indicate that all of the etchants demonstrated antimicrobial activity against the bacteria tested.

Acid Etching, Dental↗
PubMedDate not supplied

A single-component bonding system microleakage study.

The microleakage of a one-component bonding system is compared to a two-component system and a control. Class V cavity preparations were prepared in extracted teeth under high speed and water coolant so that incisal/occlusal margins were in enamel, and gingival margins were in dentin. Group I was restored with composite and no bonding agent; Group II was restored with Prime and Bond and composite, and Group III was restored with ProBond and composite. All specimens were thermocycled in fuchsin dye to evaluate the degree of microleakage. Significant differences were observed between the no bonding agent group and the Prime and Bond and ProBond groups. The results indicate that the one-step dentin bonding system has the ability to prevent microleakage effectively at both composite-enamel and composite-dentin tooth surface interfaces.

Bisphenol A-Glycidyl Methacrylate↗
PubMedDate not supplied

Antimicrobial activity produced by six dentifrices.

The antimicrobial activity of six commercially available dentifrices and positive and negative controls as they come into contact with Streptococcus mutans, S. sanguis, and Actinomyces viscosus commonly found in the oral cavity. Sterile discs treated with the dentifrices were placed on agar plates with the controls. Zones of microbial inhibition were measured in millimeters after 48 hours. All of the test dentifrices demonstrated antimicrobial activity against the bacteria.

Actinomyces↗
PubMedDate not supplied

The use of resin-ionomer in restorative procedures.

As the average age of the population increases, we are seeing a significant rise in root caries and in the need for restorative procedures associated more often with an older population. This paper describes the subgingival placement of a resin-ionomer for several restorative procedures, including root caries, resorption, endodontic perforation and root fracture. After endodontic therapy, full thickness flaps may be used to gain access to the lesion or root defect. The defects may be prepared with ultrasonic instruments and the preparations treated with a dentin conditioner. The preparations are then washed and lightly air-dried and treated with a dentin bonding agent. A resin-ionomer may then be syringed into the preparations and either light-activated or allowed to undergo a chemical set. No untoward effect has been observed during the time frame of this project. The cases presented indicate that a resin-ionomer may be used as a subgingival restorative and may be placed in lesions originally thought to be unrestorable. Thus, teeth may be saved that were previously designated for extraction.

Dental Restoration, Permanent↗