Single-bottle adhesives behave as permeable membranes after polymerisation. II. Differential permeability reduction with an oxalate desensitiser

Yiu, Cynthia K.Y.; Hiraishi, Noriko; Chersoni, Stefano; Breschi, Lorenzo; Ferrari, Marco; Prati, Carlo; King, Nigel N.M.; Pashley, David H.; Tay, Franklin R.

doi:10.1016/j.jdent.2005.05.001

« Previous Next »Journal of Dentistry
Volume 34, Issue 2 , Pages 106-116, February 2006

Single-bottle adhesives behave as permeable membranes after polymerisation. II. Differential permeability reduction with an oxalate desensitiser

Cynthia K.Y. Yiu
- Paediatric Dentistry and Orthodontics, Faculty of Dentistry, The University of Hong Kong, Pokfulam, China
Noriko Hiraishi
- Paediatric Dentistry and Orthodontics, Faculty of Dentistry, The University of Hong Kong, Pokfulam, China
Stefano Chersoni
- Department of Dental Science, University of Bologna, Italy
- Department of Dental Materials and Restorative Dentistry, Policlinico ‘Le Scotte’, University of Siena, Italy
Lorenzo Breschi
- Department of Surgical Sciences, University of Trieste, Italy
Marco Ferrari
- Department of Dental Materials and Restorative Dentistry, Policlinico ‘Le Scotte’, University of Siena, Italy
Carlo Prati
- Department of Dental Science, University of Bologna, Italy
Nigel N.M. King
- Paediatric Dentistry and Orthodontics, Faculty of Dentistry, The University of Hong Kong, Pokfulam, China
David H. Pashley
- Department of Oral Biology and Maxillofacial Pathology, Medical College of Georgia, Augusta, GA, USA
Franklin R. Tay
- Paediatric Dentistry and Orthodontics, Faculty of Dentistry, The University of Hong Kong, Pokfulam, China
- Corresponding author. Address: Paediatric Dentistry and Orthodontics, Faculty of Dentistry The University of Hong Kong, Prince Philip Dental Hospital, 34 Hospital Road, Hong Kong SAR, China. Tel.: +852 28590251; fax: +852 25593803.

Received 11 February 2005; accepted 11 May 2005.

Summary

Objectives

This study examined the changes in hydraulic conductance and ultrastructure of dentine bonded with simplified etch-and-rinse adhesives to oxalate desensitiser pre-treated acid-etched dentine.

Methods

Human dentine disks were acid-etched, treated with an oxalate desensitiser (BisBlock, Bisco), and bonded with One-Step (OS), Single Bond (SB), OptiBond Solo Plus (OB) or Prime and Bond NT (PB). Similar disks from each group were acid-etched, and bonded without oxalate pre-treatment. Hydraulic conductance of the specimens was measured at 20cm of water pressure and analysed with nonparametric statistical methods. Epoxy resin replicas of the smear layer-covered dentine and bonded dentine were examined with SEM for the extent of fluid transudation. Specimens bonded under perfusion were examined with TEM after tracer immersion.

Results

OB and PB exhibited a highly significant reversal of the reduced hydraulic conductance obtained with BisBlock on unbonded acid-etched dentine. Profuse water transudation across the bonded dentine was observed from the replicas. Adhesive interfaces were covered with spherical globules that interfered with dentine hybridization. Conversely, no significant difference in hydraulic conductance was observed in SB, between Bisblock pre-treated, unbonded and bonded acid-etched dentine. Significantly lower hydraulic conductance was shown on application of OS to Bisblock-treated acid-etched dentine. Water transudation was sparse, interfering surface globular structures were absent, and only angular subsurface crystals were seen in the dentinal tubules.

Conclusions

Convective water fluxes through dentine may be reduced by applying Bisblock to acid-etched dentine before bonding with One-Step or Single Bond. However, reducing adhesive permeability with the use of oxalate desensitiser is not applicable to low acidity adhesives such as OptiBond Solo Plus and Prime and Bond NT.

Keywords: Etch-and-rinse, Two-step, Dentine perfusion, Oxalate desensitiser, Flodec