The effects of common errors on sealing ability of total-etch adhesives

Hashimoto, Masanori; Tay, Franklin R.; Svizero, Nadia R.; Gee, Anton J. de; Feilzer, Albert J.; Sano, Hidehiko; Kaga, Masayuki; Pashley, David H.

doi:10.1016/j.dental.2005.06.004

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Volume 22, Issue 6 , Pages 560-568, June 2006

The effects of common errors on sealing ability of total-etch adhesives

Masanori Hashimoto
- Division of Pediatric Dentistry, Hokkaido University, Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Hokkaido, Japan
- Corresponding author. Tel.: +81 11 706 4292, fax: +81 11 706 4307.
Franklin R. Tay
- Paediatric Dentistry and Orthodontics, Faculty of Dentistry, University of Hong Kong, Hong Kong SAR, China
Nadia R. Svizero
- Department of Operative Dentistry, University of Sacred Heart, Bauru, SP, Brazil
Anton J. de Gee
- Department of Dental Materials Sciences, Academic Centre for Dentistry Amsterdam (ACTA), Universiteit van Amsterdam and Vrije Universiteit, Amsterdam, The Netherlands
Albert J. Feilzer
- Department of Dental Materials Sciences, Academic Centre for Dentistry Amsterdam (ACTA), Universiteit van Amsterdam and Vrije Universiteit, Amsterdam, The Netherlands
Hidehiko Sano
- Division of Cariology and Endodontology, Graduate School of Dental Medicine, Hokkaido University, Japan
Masayuki Kaga
- Division of Pediatric Dentistry, Hokkaido University, Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Hokkaido, Japan
David H. Pashley
- Department of Oral Biology and Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, USA

Received 27 January 2005; received in revised form 22 May 2005; accepted 16 June 2005.

Summary

Objectives

This study evaluated the effect of errors commonly made in using total-etch adhesives, on the resulting bond strength, fluid movement and nanoleakage of resin dentin bonds.

Methods

Two total-etch adhesives were used for bonding to dentin according to the manufacturers' recommendations, with meticulous solvent evaporation (control), or with the introduction of common bonding errors—wet bonding without solvent evaporation (no evaporation), and dry bonding.

Results

The 24-hour bond strength of the control was significantly higher than the other groups (p <0.05). For all groups, the higher initial permeability declined significantly after 24h. The fluid movement across bonded dentin was similar in the control and dry bonding for both adhesives, whereas significantly higher permeability (p<0.05) was recorded for the no evaporation groups even after 24h. Extensive silver impregnation within hybrid layers was seen by TEM in the no evaporation and dry bonding specimens after 24h. Dry bonding caused collapse of the collagen matrix and interfered with resin infiltration. In contrast, inadequate solvent evaporation and/or residual water during dentin bonding results in dilution or incomplete polymerization of the resin, leading to severe nanoleakage formation.