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

Abstract

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 (Ø = 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 μmol/ml) exceeded the sealed groups (Icon + Heliobond: 23.44 ± 7.03 μmol/ml; Icon + Transbond XT Primer: 22.17 ± 5.34 μmol/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.

• Authors: Enver Yetkiner, Florian Just Wegehaupt, Rengin Attin, Annette Wiegand, Thomas Attin
• Journal: Acta odontologica Scandinavica (Acta Odontol Scand) Vol. 72 Issue 8 Pg. 825-30 (Nov 2014) ISSN: 1502-3850 [Electronic] England
• PMID: 24850503 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Acrylates
• Coloring Agents
• Dental Materials
• Phosphoric Acids
• Pit and Fissure Sealants
• Resin Cements
• Resins, Synthetic
• Transbond XT
• icon infiltrant
• Arsenazo III
• heliobond
• phosphoric acid
• Hydrochloric Acid
• Calcium

Topics

• Acid Etching, Dental (methods)
• Acrylates (therapeutic use)
• Animals
• Arsenazo III
• Calcium (analysis)
• Cattle
• Coloring Agents
• Dental Enamel (chemistry, pathology)
• Dental Materials (chemistry)
• Hydrochloric Acid (chemistry)
• Phosphoric Acids (chemistry)
• Pit and Fissure Sealants (therapeutic use)
• Random Allocation
• Resin Cements (therapeutic use)
• Resins, Synthetic (therapeutic use)
• Solubility
• Time Factors
• Tooth Abrasion (prevention & control)
• Tooth Erosion (prevention & control)
• Toothbrushing (instrumentation)