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Microleakage of glass–ionomer cement placed in association with non‐setting calcium hydroxide
Author(s) -
MAHMOOD S. A.,
WOOD D. J.,
BOYLE E. L.,
JARAD F. D.,
YOUNGSON C. C.
Publication year - 2005
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.2004.01422.x
Subject(s) - calcium hydroxide , glass ionomer cement , cement , dentistry , association (psychology) , materials science , dental cement , composite material , chemistry , psychology , medicine , organic chemistry , adhesive , layer (electronics) , psychotherapist
summary The purpose of this investigation was to determine whether non‐setting calcium hydroxide [Ca (OH) 2 ] cement placed in the root canal system of premolar teeth would affect the subsequent microleakage of a glass–ionomer restoration (GIC). Following selection, 62 human premolar teeth extracted for orthodontic reasons were accessed and root canals prepared according to a standardized procedure. The specimens were then allocated randomly into two major groups each of 30 teeth. Two other teeth were used as a positive and a negative control. The control group was restored with glass–ionomer cement following drying of the canal and placement of a cotton wool pledget. The test group had all canals dressed with non‐setting Ca(OH) 2 and then was subdivided, one set ( n =22) being restored following conditioning of the access cavity margins, the other ( n =8) having the margins cleaned with a hand excavator. Samples were assessed for microleakage using a two‐point scoring system (leakage or no leakage) in conjunction with a clearing technique using AgNO 3 . Using Fisher's exact test, a statistically significant difference was found between the control and test groups ( P < 0·05) but there was no significant difference between the excavated and conditioned cavities ( P =0·55). It is concluded that contamination of access cavity margins with Ca(OH) 2 during medication of a root canal interferes with the bond of GIC, resulting in increased microleakage in vitro .