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Microleakage in endodontically treated teeth: influence of calcium hydroxide dressing following bleaching
Author(s) -
Demarco F. F.,
Freitas J. M.,
Silva M. P.,
Justino L. M.
Publication year - 2001
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1046/j.1365-2591.2001.00418.x
Subject(s) - sodium perborate , calcium hydroxide , dentistry , hydrogen peroxide , bleach , glass ionomer cement , pulp capping , carbamide peroxide , pulp (tooth) , root canal , materials science , chemistry , dentin , varnish , nuclear chemistry , composite material , medicine , coating , organic chemistry
Abstract Aim The purpose of the present study was to evaluate microleakage of a fourth generation dentine‐bonding agent and composite restoration during a walking bleach treatment. Methodology Thirty extracted non‐carious incisors were selected and conventional root canal treatment was performed. Teeth were randomly divided into 3 groups ( n = 10): group A (control), access cavities were restored with a fourth generation dentine‐bonding agent, and incrementally restored with composite resin; group B, a paste composed of sodium perborate and hydrogen peroxide was placed into the pulp chamber and sealed with glass ionomer cement for 7 days, teeth were then restored in the same manner as group A; group C, a paste of sodium perborate and hydrogen peroxide was placed in the pulp chamber for 7 days and then after removal of the bleaching mixture, pulp chambers were filled with a calcium hydroxide paste and cavities sealed with glass ionomer for 1 week. The cavities were then restored with bonded restorations as in groups A and B. Teeth were subjected to thermal cycling and immersed in methylene blue for 8 h. Teeth were sectioned from buccal to lingual, through the centre of the restoration, using a diamond disk. Leakage was assessed using a standard scheme, under magnification (×20). Data were submitted to statistical analysis using nonparametric Kruskal–Wallis test. Results Groups A and C exhibited similar leakage patterns, and both demonstrated less leakage values than group B ( P < 0.05). Conclusions It was concluded that bleaching with sodium perborate and hydrogen peroxide increases microleakage; short‐term use of a calcium hydroxide medicament did not increase microleakage.