Effect of simulated pulpal pressure on all-in-one adhesive bond strengths to dentine

Hosaka, Keiichi; Nakajima, Masatoshi; Yamauti, Monica; Aksornmuang, Juthatip; Ikeda, Masaomi; Foxton, Richard M.; Pashley, David H.; Tagami, Junji

doi:10.1016/j.jdent.2006.08.001

« Previous Next »Journal of Dentistry
Volume 35, Issue 3 , Pages 207-213, March 2007

Effect of simulated pulpal pressure on all-in-one adhesive bond strengths to dentine

Keiichi Hosaka
- Cariology and Operative Dentistry, Department of Restorative Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
- Corresponding author. Tel.: +81 3 5803 5483; fax: +81 3 5803 0195.
Masatoshi Nakajima
- Cariology and Operative Dentistry, Department of Restorative Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
Monica Yamauti
- Department of Health Science, School of Dentistry FEAD, Center of Entrepreneur Management, Av. Brasil 1879, Belo Horizonte 30140, MG, Brazil
Juthatip Aksornmuang
- Department of Prosthetic Dentistry, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
Masaomi Ikeda
- Cariology and Operative Dentistry, Department of Restorative Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
Richard M. Foxton
- Department of Conservative Dentistry, Floor 25, Guy's, King's and St. Thomas’ Dental Institute, Kings College London, Tower, London Bridge, London SE1-9RT, UK
David H. Pashley
- Department of Oral Biology and Maxillofacial Pathology, Medical College of Georgia, 1120 15th Street, CL2112 Augusta, GA 30907, United States
Junji Tagami
- Cariology and Operative Dentistry, Department of Restorative Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
- Center of Excellence Program for Frontier Research on Molecular Destruction and Reconstruction of Tooth and Bone, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan

Received 14 December 2005; received in revised form 31 July 2006; accepted 3 August 2006.

Abstract

Objectives

To evaluate the durability of all-in-one adhesive systems bonded to dentine with and without simulated hydrostatic pulpal pressure (PP).

Methods

Flat dentine surfaces of extracted human molars were prepared. Two all-in-one adhesive systems, One-Up Bond F (OBF) (Tokuyama Corp., Tokyo, Japan), and Fluoro Bond Shake One (FBS) (Shofu Co., Kyoto, Japan) were applied to the dentine surfaces under either a PP of 0 or 15cm H₂O. Then, resin composite build-ups were made. The specimens bonded under pressure were stored in 37°C water for 24h, 1 and 3 months under 15cm H₂O PP. Specimens not bonded under pressure were stored under zero PP. After storage, the specimens were sectioned into slabs that were trimmed to hourglass shapes and subjected to micro-tensile bond testing (μTBS). The data were analysed using two-way ANOVA and Holm–Sidak HSD multiple comparison tests (α=0.05).

Results

The μTBS of OBF fell significantly (p<0.05) when PP was applied during bonding and storage, regardless of storage time. In contrast, although the μTBS of OBF specimens bonded and stored without hydrostatic pressure storage fell significantly over the 3 months period, the decrease was less than half as much as specimens stored under PP. In FBS bonded specimens, although there was no significant difference between the μTBS with and without hydrostatic pulpal pressure at 24h, by 1 and 3 months of storage under PP, significant reductions were seen compared with the control group without PP.

Conclusion

The μTBS of OBF bonded specimens was lowered more by simulated PP than by storage time; specimens bonded with FBS were not sensitive to storage time in the absence of PP, but showed lower bond strengths at 1 and 3 months in the presence of PP.

Keywords: Durability, Pulpal pressure, All-in-one adhesives, Micro-tensile bond strength, Dentine