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Effect of calcium hydroxide as a supplementary barrier in the radicular penetration of hydrogen peroxide during intracoronal bleaching in vitro
Author(s) -
Lambrianidis T.,
Kapalas A.,
Mazinis M.
Publication year - 2002
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.1365-2591.2002.00580.x
Subject(s) - calcium hydroxide , distilled water , dentistry , glass ionomer cement , hydrogen peroxide , penetration (warfare) , cement , chemistry , materials science , nuclear chemistry , composite material , medicine , chromatography , organic chemistry , operations research , engineering
Abstract Lambrianidis T, Kapalas A, Mazinis M . Effect of calcium hydroxide as a supplementary barrier in the radicular penetration of hydrogen peroxide during intracoronal bleaching in vitro . International Endodontic Journal , 35 , 985–990, 2002. Aim To examine pH changes in the cervical external root surface, when calcium hydroxide was used as a supplementary barrier to the protective base material during intracoronal bleaching. Methodology Twenty‐eight single‐rooted human premolars extracted for orthodontic reasons were instrumented with K‐Flex files, obturated with gutta‐percha and subjected to thermocatalytic bleaching. The teeth were divided into four groups. In group A, a glass‐ionomer cement barrier was placed at the cemento–enamel junction (CEJ) level and in group C, the barrier was placed 1 mm apical to the CEJ. In groups B and D, Ca(OH) 2 was placed in contact and apical to the glass‐ionomer cement at the CEJ and 1 mm apical to the CEJ, respectively. The teeth were placed in vials containing distilled water and the pH values of the medium surrounding the teeth were recorded after 1, 2, 4, 10 and 15 days, following renewal of the medium. Results The pH in the medium became acidic in all groups. No statistically significant differences existed between groups for all the experimental days ( P = 0.790). Conclusion The placement of Ca(OH) 2 as a supplementary barrier during intracoronal bleaching did not have a significant effect in reversing the acidic pH created at the external root surface in vitro . Its potential effect during these procedures in vivo needs to be further investigated.