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.

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.

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.

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.

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.