Indiana University-Purdue University Indianapolis (IUPUI) / This study evaluated the effectiveness of bleaching tetracycline-stained
teeth by measuring the loss of fluorescent intensity from teeth
that were bleached.
Nineteen male New Zealand white rabbits, with 58 incisors stained with
oxytetracycline and 16 incisors as unstained controls, were used. Three rabbits
were sacrificed to determine whether the tetracycline stain was comparable
between incisors in the same jaw. Of the remaining 16 animals, 6 were bleached
once and 10 were bleached twice. One maxillary and one mandibular incisor
were bleached in each jaw with 30 percent hydrogen peroxide and heat for ten
minutes per tooth; the other incisors were protected with a rubber dam. The
animals were sacrificed 24 hours after the last bleach. The fluorescent intensity
of 374 select ground sections 100 ± 5 microns thick from the incisal, middle and gingival thirds of the teeth were measured with an ultraviolet light microscope coupled to a television electronic measurement system. These measurements were statistically analyzed
by t-test, and observations correlated.
The dentin of tetracycline-stained maxillary incisors which were bleached
twice and the dentin in the incisal one-third of the mandibular incisors which
were bleached twice had a significantly (P ≤ 0.001, P ≤ 0.005) lower tetracycline
fluorescent intensity than the dentin of unbleached tetracycline-stained teeth.
The greatest loss of fluorescent intensity of tetracycline occurred in dentin
closest to the dentino-enamel junction and varied from about 150 to 350 microns
from the outer enamel surface. Clinical Kodachromes indicate that the loss
of tetracycline pigment is associated with the loss of tetracycline fluorescence;
The ground sections showed that the tetracycline fluorescence was never totally removed by two bleaches.
| Identifer | oai:union.ndltd.org:IUPUI/oai:scholarworks.iupui.edu:1805/3555 |
| Date | January 1974 |
| Creators | Fleege, Patrick A. |
| Contributors | Roche, James R., 1924-, Klein, Arthur Irving, 1922-2004, Katz, Simon, 1920-1987, Koerber, Leonard G., Mitchell, David F. |
| Source Sets | Indiana University-Purdue University Indianapolis |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
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