Nanoleakage of cervical restorations of four dentin bonding systems

J Adhes Dent. 2000 Spring;2(1):57-65.

Abstract

Purpose: The aim of this study was to evaluate the degree of nanoleakage of restorations placed in cervical preparations with dentin bonding systems.

Materials and methods: The dentin bonding systems used were Single Bond, One Coat Bond, Prime & Bond NT/NRC, and PermaQuik. Ten saucer-shaped cervical preparations were bonded with one of the dentin bonding systems and restored with Silux Plus resin composite in each group. After 24 hours storage in 37 degrees C water, restorations were finished and the surrounding tooth surfaces were coated with nail varnish. The samples were immersed in 50% w/v solution of silver nitrate for 24 hours, and exposed to photodeveloping solution for 8 hours. The samples were cut longitudinally through the center, polished, carbon coated and observed in a Field Emission SEM using backscattered electron mode. The degree of silver penetration along the preparation wall was observed and calculated as a percentage of the total preparation wall length. Results were analyzed by one-way ANOVA and LSD tests.

Results: PermaQuik demonstrated the lowest leakage score and the least silver deposition within the hybrid layer, while Prime & Bond NT/NRC showed the greatest leakage scores and the most silver deposition within the hybrid layer. Different nanoleakage patterns were observed for the different adhesive systems.

Conclusion: First, the composition of each adhesive system may play a role in the different leakage patterns. Second, the current dentin bonding systems used in this study did not achieve perfect sealing at the restoration-dentin interface. This may influence the durability of the bond to dentin.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acid Etching, Dental
  • Analysis of Variance
  • Bisphenol A-Glycidyl Methacrylate / chemistry
  • Coloring Agents
  • Composite Resins / chemistry
  • Dental Bonding
  • Dental Cavity Preparation / classification
  • Dental Leakage / classification*
  • Dental Polishing
  • Dental Restoration, Permanent / classification*
  • Dentin / ultrastructure
  • Dentin-Bonding Agents / chemistry*
  • Humans
  • Image Enhancement
  • Methacrylates / chemistry
  • Microscopy, Electron, Scanning
  • Polymethacrylic Acids / chemistry
  • Silver Nitrate
  • Statistics as Topic
  • Tooth Cervix / ultrastructure*

Substances

  • Coloring Agents
  • Composite Resins
  • Dentin-Bonding Agents
  • Methacrylates
  • One Coat Bond
  • PermaQuik
  • Polymethacrylic Acids
  • Prime & Bond
  • single bond
  • Silux Plus
  • Bisphenol A-Glycidyl Methacrylate
  • Silver Nitrate