Abstract：
INTRODUCTION:Hydrogen peroxide tooth bleaching is claimed to cause alterations in dental tissue structures. This study investigated the influence of the number of bleaching sessions on pulp tissue in rats. METHODS:Male Wistar rats were studied in 5 groups (groups 1S-5S) of 10 each, which differed by the number (1-5) of bleaching sessions. In each session, the animals were anesthetized, and 35% hydrogen peroxide gel was applied to 3 upper right molars. Two days after the experimental period, the animals were killed, and their jaws were processed for light microscope evaluation. Pulp tissue reactions were scored as follows: 1, no or few inflammatory cells and no reaction; 2, <25 cells and a mild reaction; 3, between 25 and 125 cells and a moderate reaction; and 4, 125 or more cells and a severe reaction. Results from each experimental group were compared between groups and within groups to the corresponding unbleached upper left molars and analyzed for significant differences using the Kruskal-Wallis test (P < .05). RESULTS:All tissue sections showed significant bleaching-induced changes in the dental pulp. After 1 bleaching session, necrotic tissue in the pulp horns and underlying inflammatory changes were observed. The extent and intensity of these changes increased with the number of bleaching sessions. After 5 sessions, the changes included necrotic areas in the pulp tissue involving the second third of the radicular pulp and intense inflammation in the apical third. CONCLUSIONS:The number of bleaching sessions directly influenced the extent of pulp damage.
journal_name
J Endodjournal_title
Journal of endodonticsauthors
Cintra LT,Benetti F,da Silva Facundo AC,Ferreira LL,Gomes-Filho JE,Ervolino E,Rahal V,Briso ALdoi
10.1016/j.joen.2013.08.007subject
Has Abstractpub_date
2013-12-01 00:00:00pages
1576-80issue
12eissn
0099-2399issn
1878-3554pii
S0099-2399(13)00717-6journal_volume
39pub_type
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更新日期：2016-04-01 00:00:00
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pub_type： 杂志文章,收录出版
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更新日期：2008-05-01 00:00:00
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更新日期：2016-04-01 00:00:00
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更新日期：2006-12-01 00:00:00
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更新日期：2013-05-01 00:00:00
abstract：INTRODUCTION:This study evaluated the cyclic fatigue resistance (CFR) of Reciproc (R25 and R40; VDW, Munich, Germany) and Reciproc Blue (R25 and R40, VDW) instruments used in an artificial S-shaped canal. METHODS:A total of 80 files were tested in an S-shaped canal (n = 20 for each file, Reciproc R25 and R40 and Recip...
journal_title：Journal of endodontics
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更新日期：2017-10-01 00:00:00
