Detection of interproximal caries by transillumination.
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Adult↗
Biomedical subjects
W W Johnson
Publications and source records attributed to W W Johnson.
A comparison of amalgam microleakage with a 4-META liner and copal varnish.
This in vitro study compared the microleakage of Class 5 amalgam restorations placed in extracted human teeth lined with a 4-META liner (Amalgambond), with similar restorations lined with copal varnish (Copalite). The restored teeth were stored in saline for 1 week, 6 months, and 1 year, then thermocycled, stained with 5% methylene blue, sectioned, and viewed using a light microscope. It was found that at 1 week and 6 months the 4-META group leaked significantly less than the copal resin group, but after 1 year there was no significant difference between groups.
Dental Alloys↗
Postoperative pain following bonded amalgam restorations.
Sixty subjects were randomized into two groups. The time, in seconds, that it took subjects to respond to a standardized cold stimulus was recorded at baseline and again 1 week following treatment. During the intervening week subjects filled out three self-report questionnaires about pain from exposure to cold and several other common sources of postoperative pain. These questionnaires were filled out after 1 day, again 3 days after the first questionnaire, and 3 days after the second. Subjects mailed the questionnaires in immediately to provide three independent reports about cold sensitivity. The group receiving an OptiBond adhesive liner under their amalgam restorations was not found to be any less sensitive to cold, either by timed response to a cold stimulus or by self-report of pain, than the group receiving conventional liners and bases.
Adolescent↗