In:
Journal of Prosthodontics, Wiley, Vol. 11, No. 2 ( 2002-06), p. 81-85
Abstract:
Purpose This study evaluated the effects of a simulated 1‐ and 2‐week night guard bleaching technique using various bleaching gel concentrations on wear resistance and color change of human enamel opposing a feldspathic porcelain substrate. Materials and Methods VMK 68 feldspathic porcelain was formed into 15‐mm disks ( n = 63 ) and fired according to manufacturer's recommendations. Enamel cusps were formed and shaped from extracted third molars and treated with 1 of 3 bleaching materials for 7 or 14 days. Specimens were kept at 37°C in 100% humidity. The control group was subjected to identical conditions but with water replacing the bleaching gel between and during bleaching treatments. After simulated bleaching, the enamel cusp specimens were subjected to 3‐body wear testing opposite a highly polished porcelain substrate. Enamel wear was evaluated using optical scanning methods, and color was measured with a small‐aperture colorimeter. Data were subjected to a one‐way repeated‐ measure analysis of variance and various post hoc statistics. Results Results indicated that the within effect of treatment time (7 or 14 days) did not significantly affect ( p = 0.13 ) the size of the resulting enamel wear facet, whereas the between effect of bleaching concentration was significant ( p = 0.01 ). Statistical analysis of unbleached control groups suggests that between‐group differences can be explained by variations in wear rates of the 3 enamel groups, not by the concentration differences in bleaching gels. All bleaching treatments resulted in significant color changes ( p = 0.04 ) compared to the unbleached control, but the bleach concentration did not significantly influence the magnitude of color change ( p = 0.81 ). Conclusions A simulated night guard vital bleaching treatment of 1 or 2 weeks had no significant effect on the wear resistance of human enamel in vitro. The increased bleaching treatment time and concentration did not significantly affect the amount of enamel color change.
Type of Medium:
Online Resource
ISSN:
1059-941X
,
1532-849X
DOI:
10.1053/jopr.2002.124675
Language:
English
Publisher:
Wiley
Publication Date:
2002
detail.hit.zdb_id:
2053077-8
