Assessment of residual active chlorine in sodium hypochlorite solutions after dissolution of porcine incisor pulpal tissue

Clarkson R.M., Smith T.K., Kidd B.A., Evans G.E. and Moule A.J. (2013) Assessment of residual active chlorine in sodium hypochlorite solutions after dissolution of porcine incisor pulpal tissue. Australian Dental Journal, 58 4: 428-433. doi:10.1111/adj.12115


Author Clarkson R.M.
Smith T.K.
Kidd B.A.
Evans G.E.
Moule A.J.
Title Assessment of residual active chlorine in sodium hypochlorite solutions after dissolution of porcine incisor pulpal tissue
Journal name Australian Dental Journal   Check publisher's open access policy
ISSN 0045-0421
1834-7819
Publication date 2013-12-01
Year available 2013
Sub-type Article (original research)
DOI 10.1111/adj.12115
Open Access Status Not yet assessed
Volume 58
Issue 4
Start page 428
End page 433
Total pages 6
Place of publication West Sussex United Kingdom
Publisher Wiley-Blackwell Publishing
Language eng
Abstract Background: In previous studies, surfactant-containing Hypochlor brands of sodium hypochlorite showed better tissue solubilizing abilities than Milton; differences not explained by original active chlorine content or presence of surfactant. It was postulated that exhaustion of active chlorine content could explain differences. This study aimed to assess whether Milton's poorer performance was due to exhaustion of active chlorine. Parallel experiments assessed the influence of titration methods, and the presence of chlorates, on active chlorine measurements.
Formatted abstract
Background
In previous studies, surfactant-containing Hypochlor brands of sodium hypochlorite showed better tissue solubilizing abilities than Milton; differences not explained by original active chlorine content or presence of surfactant. It was postulated that exhaustion of active chlorine content could explain differences. This study aimed to assess whether Milton's poorer performance was due to exhaustion of active chlorine. Parallel experiments assessed the influence of titration methods, and the presence of chlorates, on active chlorine measurements.

Methods
Time required to dissolve one or groups of 10 samples of porcine incisor pulp samples in Milton was determined. Residual active chlorine was assessed by thermometric titration. Iodometric and thermometric titration was carried out on samples of Milton. Chlorate content was also measured.

Results
Dissolution of single and 10 pulp samples caused a mean loss of 1% and 3% respectively of active chlorine, not being proportional to tissue dissolved. Thermometric ammonium ion titration resulted in 10% lower values than iodometric titration. Chlorate accounted for much of this difference.

Conclusions
Depletion of active chlorine is not the reason for differences in tissue dissolving capabilities of Milton. Thermometric ammonium ion titration gives more accurate measurement of active chlorine content than iodometric titration.
Keyword Dental pulp solubility
Iodometric titration
Residual active chlorine
Sodium hypochlorite
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2014 Collection
School of Dentistry Publications
 
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