Journal Article

Analysis of supra- and subgingival long-term biofilm formation on orthodontic bands

A. Demling, W. Heuer, C. Elter, T. Heidenblut, Fr.-W. Bach, R. Schwestka-Polly and M. Stiesch-Scholz

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 31, issue 2, pages 202-206
Published in print April 2009 | ISSN: 0141-5387
Published online April 2009 | e-ISSN: 1460-2210 | DOI: http://dx.doi.org/10.1093/ejo/cjn090
Analysis of supra- and subgingival long-term biofilm formation on orthodontic bands

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Insertion of fixed orthodontic appliances induces increased biofilm formation caused by a higher number of plaque-retentive sites. The purpose of the study was to perform a quantitative analysis of supra- and subgingival long-term biofilm formation on orthodontic bands.

Ten patients (five females and five males, aged 18.3 ± 5.4 years) who had received therapy with fixed orthodontic appliances for 24 ± 9 months were enrolled in the study. Biofilm formation on 28 orthodontic bands was analyzed quantitatively with the Rutherford backscattering detection method, a scanning electron microscopy technique. The biofilm formation for the supra- and subgingival surfaces was calculated from the grey values. Statistical analysis was performed with a mixed model with the patient as the random factor. A P-value <0.05 was considered significant.

A biofilm was found on 16.1 ± 9.2 per cent of supragingival surfaces and on 3.6 ± 4.4 per cent of subgingival surfaces. Differences in biofilm formation in supra- and subgingival surfaces were statistically significant (P < 0.05) and formed a distinct demarcation line. Despite the presence of supragingival biofilm, no mature subgingival biofilm was found on the tested orthodontic bands.

Journal Article.  2596 words.  Illustrated.

Subjects: Restorative Dentistry and Orthodontics

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