Publication: Effect of bleaching agents on bonding to pulp chamber dentine
3
Issued Date
2005-04-01
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ISSN
01432885
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2-s2.0-17144377540
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Mahidol University
Rights Holder(s)
SCOPUS
Bibliographic Citation
International Endodontic Journal. Vol.38, No.4 (2005), 211-217
Suggested Citation
S. Timpawat, C. Nipattamanon, K. Kijsamanmith, H. H. Messer Effect of bleaching agents on bonding to pulp chamber dentine. International Endodontic Journal. Vol.38, No.4 (2005), 211-217. doi:10.1111/j.1365-2591.2004.00931.x Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/16480
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Title
Effect of bleaching agents on bonding to pulp chamber dentine
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Abstract
Aim: To determine the effect of intracoronal bleaching agents on adhesion of bonding agents to pulp chamber dentine. Methodology: Forty extracted human maxillary anterior teeth were randomly divided into four groups of 10 teeth each. Bleaching agents were sealed in pulp chambers for 7 days, as in clinical use. Group 1 (control): distilled water, group 2: 35% hydrogen peroxide, group 3: sodium perborate mixed with water, and group 4: sodium perborate mixed with 35% hydrogen peroxide. Teeth were stored in saline at 37°C for 7 days. After the bleaching agent was removed, teeth were leached in water for a further 7 days prior to bonding. The crown was cut vertically from mesial to distal and the labial pulp chamber dentine was prepared for bonding with Clearfil SE-Bond and filled with resin composite (Clearfil AP-X). The bonded specimens were kept moist at 37°C for 24 h. Microtensile bond strengths were determined using a universal testing machine. Additional teeth were prepared using the same bleaching procedures to investigate the scanning electron microscopic appearance of the dentine surface. Results: Mean values (±SD) of microtensile bond strength for the experimental groups were: group 1: 5.29 ± 2.21 MPa, group 2: 5.99 ± 1.51 MPa, group 3: 9.17 ± 1.65 MPa and group 4: 3.99 ± 1.31 MPa. Dentine treated with sodium perborate in water (group 3) had significantly higher mean bond strength when compared with the other three groups (P < 0.05, Tukey's test). Mean bond strength was lowest when dentine was treated with sodium perborate plus hydrogen peroxide (group 4). Conclusions: In terms of subsequent bond strength during restoration, sodium perborate mixed with distilled water appears to be the best intracoronal bleaching agent. © 2005 International Endodontic Journal.