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Biomedical subjects

G T Charbeneau

Publications and source records attributed to G T Charbeneau.

At least 19 recordsLinked to original sources
PubMed1990

A clinical scanning electron microscope study of tooth surface preparation and bonding.

This clinical study utilized cut dentine surfaces on which the Creation Bond System and Scotchbond were applied after various surface treatments. It was observed under the scanning electron microscope that preparation with a tungsten carbide bur left a smear layer on the dentine. When this surface was pumiced, the smear layer remained and the tubules were plugged with smear debris. Polyacrylic acid and citric acid removed the smear layer from the dentine surface. When the Creation Bond System was applied to the surface treated with polyacrylic acid, hollow depressions were produced. Application of the Creation Bond System to the surface treated with citric acid resulted in some resin tag formation into the dentinal tubules as well as hollow depressions on the resin surface. The presence of these irregularities in the resin indicated fluid from the dentinal tubules prevented contact of the bonding resin with the dentine surface. This degree of contamination was not observed when Scotchbond was applied to a pumiced dentine surface.

Acid Etching, Dental↗
PubMed1989

Glass-ionomer cements in dental practice: a national survey.

Certain characteristics of glass-ionomer cements would appear to make them desirable dental materials; however, many practitioners are reluctant to use them because of reports of postoperative sensitivity. The members of the Academy of Operative Dentistry were surveyed in order to assess quantitatively and qualitatively the use of glass-ionomer cements in their practices, as well as the incidence and nature of postoperative sensitivity. The following data were collected: 1) the past and present use of glass-ionomer cements, 2) reasons for disuse of glass-ionomer cements, 3) products which are or have been used, and 4) the incidence of and resolution of postoperative sensitivity. The results are presented and discussed. An interesting secondary finding identified that zinc phosphate when used as a luting agent may contribute to postoperative sensitivity more often than is appreciated.

Dental Cements↗
PubMed1989

Quantitative evaluation of approximal contacts in Class 2 composite resin restorations: a clinical study.

The purpose of this study was to develop an accurate and reproducible intraoral method of measuring the distance between two teeth, and to conduct a clinical pilot study of the effect of placement of a class 2 posterior resin restoration upon this intertooth dimension. A Kaman Sciences KD-2611 noncontact displacement measuring system with a 1U unshielding sensor, based upon the variable resistance of eddy current, was used for the intraoral measurement. Seven patients requiring conservative interproximal restorations (initial placements or replacements) on the premolars were selected. Addition silicone impressions were taken of the posterior quadrants from which low-fusing metal (Cerrolow-136) casts were made. Composite resin copings constructed on modified rubber dam clamps were fabricated for the restoration and adjacent teeth upon these metal casts. Aluminum targets and Plexiglas holders for the sensor were attached to the bow of the rubber dam clamp with light-activated composite resin. Quantitative measurements of intertooth distance were made preoperatively, postoperatively, and at one-week and 4 1/2-month recalls after placement of class 2 composite resin restorations for 11 teeth. Four unrestored premolars served as a control. The data were tabulated and analyzed using one-way analysis of variance. The results indicated that the mean postoperative intercoping distance for restored teeth increased after a multiple wedging technique had been applied during restorative procedure. At the one-week recall, these distances had decreased. The 4 1/2-month measurements showed a further decrease with an average loss of 15 microns from the preoperative baseline.

Analysis of Variance↗
PubMed1987

An evaluation of a glass ionomer luting agent: pulpal histological response.

Pulpal histological response after crown cementation with a glass ionomer luting agent was evaluated and compared with the response to a polycarboxylate cement or a varnish plus zinc phosphate cement. Pulpal histological response was evaluated on teeth that had full crowns cemented with the test luting agents 3, 10, and 56 days after cementation. No statistically significant differences were found in pulpal histological response between the materials tested during all periods. These findings suggest that factors other than pulpal inflammation are contributing to the reported hypersensitivity after cementation associated with glass ionomer luting agents.

Animals↗
PubMed1987

An evaluation of a glass ionomer luting agent: bacterial leakage.

This study quantitatively evaluates the bacterial leakage beneath crowns cemented with a glass ionomer cement compared with those cemented with a polycarboxylate cement or a varnish plus zinc phosphate cement. Bacterial samples were taken from beneath full crowns cemented with the test luting agents 3, 10, and 56 days after cementation. Two-way analysis of variance of the resultant data showed a significant increase in bacterial counts for zinc phosphate, a significant decrease for polycarboxylate, and no change for glass ionomer. These findings suggest that bacterial leakage may not be the reason for the reported poor clinical response associated with glass ionomer luting agents.

Bacteria↗
PubMed1986

Urgent treatment in operative dentistry.

This article has described the treatment for a variety of restorative situations requiring urgent treatment. Successful management of these situations begins with a thorough knowledge of their possible causes and is reinforced by a careful history and a complete examination using all available diagnostic tools. By applying modern treatment modalities we have the ability to reduce the pain and discomfort associated with urgencies classified as restorative in nature.

Dental Occlusion↗
PubMed1985

Quantitative evaluation of proximal tooth movement effected by wedging: a pilot study.

The major purpose of this pilot study was to develop a method to accurately measure proximal tooth movement. A preliminary clinical evaluation of anterior and posterior tooth movement was performed with five patients. The patients were carefully chosen to eliminate as many variables as possible. The controlled patient criteria included periodontal health, proximal contacts, the age of the patients, and the teeth selected for anterior and posterior displacement. The small sample size dictates that additional experimentation must be performed before definitive conclusions can be drawn.

Adult↗
PubMed1985

Quality assessment of amalgam and inlay restorations on posterior teeth: a retrospective study.

This study was designed to assess and compare the quality of posterior proximo-occlusal amalgam and inlay restorations relative to type of restoration (material, surfaces involved, and cusp protection) and length of service of the restorations. A clinical evaluation system based on operationally defined and clinically important criteria was used. Clinically and statistically significant differences were found between overall ratings for amalgam and inlay restorations and between small (two-surface) amalgam and inlay restorations, as well as between larger (three-surface) amalgam and inlay restorations. In all cases, inlay restorations were of higher quality. A not acceptable rating for marginal integrity was the most frequent reason for not acceptable overall ratings. There was no difference in satisfactory/not acceptable ratings for inlay restorations with or without protected cusps (p = .95).

Bicuspid↗
PubMed1982

Polished versus autoglazed porcelain surfaces.

Four different porcelain polishing sequences were evaluated, and the resulting polished surfaces were compared to an unaltered glazed surface. The sequences included: (1) superfine diamond, Dedeco wheels, and levigated alumina; (2) Shofu porcelain polishing system; (3) superfine diamond, Cratex wheel, Burlew disk, and levigated alumina; and (4) Jelenko porcelain carving and polishing wheels. No statistically significant differences were found for the surface roughness values among the initial glazed samples. Furthermore, no significant differences were found between the final polished surfaces and the initial autoglazed surfaces for any of the four test sequences. Significant differences were found between comparable abrasives among the polishing sequences, as well as between steps within a single polishing sequence. The clinical significance of these differences in regard to gingival health or occlusal abrasion and wear is yet to be determined.

Dental Porcelain↗