Thermal and chromatic comparison of three non vital bleaching techniques
Date
1986
DOI
Authors
Marujo, Alicia Iglesias
Version
OA Version
Citation
Abstract
Three non vital bleaching procedures were described and compared.
The non vital B.U. bleaching technique was described in detail. Heat application was carefully studied and measured by thermocouples placed at the external cervical portion of teeth. Extracted teeth mounted in plaster as well as two clinical situations involving patients were used for the collection of proper data.
Also freshly extracted teeth were stained in vitro to compare and evaluate the results of three different non vital bleaching techniques: the Walking Bleach technique; the Non Vital B.U. Bleaching technique and the combination of Walking and Thermocatalytic techniques proposed in the literature.
The efficacy of each bleaching technique was evaluated by changes in the shades recorded during the three different stages of the investigation: before any procedure (original shades); after the blood staining, simulating pulpal hemorrhage as the primary cause of discoloration; and after the bleaching procedures (final shades). Instead of traditional shade guides or other subjective color evaluation, shades were measured by a chromometer device from Minolta Company known as Chroma Meter CR-121. The measurements were based on the CIELab color system.
Results indicated that during a non vital bleaching procedure following the B.U. bleaching technique, the temperature of the cervical portion of the tooth was not significantly raised to induce harm to the tooth or adjacent tissues. On average, the temperature at the cervical area increased 1O to 15[degrees]C.
All three techniques performed reasonably well. The non vital B.U. bleaching technique outperformed the others for presenting the smallest standard deviations and the smallest values for [Delta]a and [Delta]b in the CIELab system. This indicated that the non vital B.U. bleaching technique was the most consistent and effective in terms of correcting chroma and hue staining effects.
Description
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Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1986 (Endodontics)
Bibliography : leaves 82-86.
Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1986 (Endodontics)
Bibliography : leaves 82-86.
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This work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.