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Quintessence Int 38 (2007), No. 8     26. July 2007
Quintessence Int 38 (2007), No. 8  (26.07.2007)

Online Article, Page 708, PubMed:17823673


Online Article: Root surfaces after ultrasonic instrumentation with a polishing fluid
Braun, Andreas / Cichocka, Anna / Semaan, Enas / Krause, Felix / Jepsen, Soren / Frentzen, Matthias
Objective: The recently introduced Vector system is recommended to be used in conjunction with a polishing fluid containing hydroxylapatite granules (< 10 µm). The aim of the present study was to assess morphologic alterations of the root surface after ultrasonic treatment with the polishing fluid.
Method and Materials: Cementum of 30 freshly extracted human teeth was removed to a level of 4 mm below the cementoenamel junction. Surfaces were root-planed and conditioned with citric acid to remove the smear layer. Teeth were divided into 5 groups, with group 1 as the untreated control. Group 2 was solely treated with the ultrasonic system. In group 3, the ultrasonic system was used in conjunction with the polishing fluid. Group 4 was treated with a medium-hard toothbrush and the polishing fluid. Group 5 was treated only with the toothbrush. Specimens were evaluated by both light and scanning electron microscopy.
Results: Dentinal tubules were not covered by a smear layer in the control group, whereas in group 2, a smear layer could be observed in some specimens. In group 3 dentinal tubules were always covered by a layer consisting of granules of about 2 µm. In group 4 all samples showed a layer containing granules of about 5 µm, and in group 5 a thin smear layer could be observed.
Conclusion: The use of a polishing fluid containing hydroxylapatite granules during treatment of the root surface results in a granular layer covering the dentinal tubules. This layer may reduce hypersensitivity after ultrasonic subgingival scaling.

Keywords: hydroxylapatite, hypersensitivity, smear layer, toothbrush, ultrasonic periodontal treatment, Vector system