Stability of two resin combinations used as sealants against toothbrush abrasion and acid challenge in vitro

YETKİNER E. , Wegehaupt F. J. , Attin R., WİEGAND A., Attin T.

ACTA ODONTOLOGICA SCANDINAVICA, cilt.72, ss.825-830, 2014 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 72 Konu: 8
  • Basım Tarihi: 2014
  • Doi Numarası: 10.3109/00016357.2014.913197
  • Sayfa Sayıları: ss.825-830


Objective. To test the stability of two conventional adhesives when combined with a low-viscosity caries infiltrant used for sealing sound enamel against toothbrush abrasion and acid challenge in vitro. Materials and methods. Bovine enamel discs (empty set = 3 mm) randomly assigned to three groups (n = 10/group) were etched with 37% phosphoric acid for 30 s and treated with resins of different monomer contents forming three test groups: (1) Untreated specimens (Control); (2) Infiltrant (Icon, DMG) + conventional enamel bonding adhesive (Heliobond, Ivoclar Vivadent); and (3) Infiltrant + conventional orthodontic adhesive (Transbond XT Primer, 3M Unitek). All specimens were immersed in hydrochloric acid (pH 2.6) for up to 9 days, during which they were exposed to 1825 toothbrush-strokes per day. Calcium dissolution was assessed using Arsenazo III method at 24-h intervals. Data were analyzed by Kruskal-Wallis and Wilcoxon signed ranks tests. Results. Cumulative calcium dissolution for the untreated specimens (39.75 +/- 7.32 mu mol/ml) exceeded the sealed groups (Icon + Heliobond: 23.44 +/- 7.03 mu mol/ml; Icon + Transbond XT Primer: 22.17 +/- 5.34 mu mol/ml). Untreated specimens presented a relatively constant calcium dissolution rate throughout the experimental period, whereas the sealed groups presented a gradual increase indicating weakening of the seal by toothbrush abrasion. Both sealed groups presented significantly lower daily calcium dissolution at all time points compared to the control, except for Group 2 on the last measurement day. Conclusions. Low-viscosity caries infiltrant application on sound enamel prior to conventional resin application provided a protective effect against enamel demineralization, but this effect was not stable when challenged mechanically by toothbrush abrasion.