Title: 0225 - Eight-year Durability of Resin-dentin Interfaces of a 1-SEA


Keiichi Hosaka (Presenter)
Tokyo Medical and Dental University

Juri Hayashi, Tokyo Medical and Dental University
Daisuke Araoka, Tokyo Medical and Dental University
Masatoshi Nakajima, Tokyo Medical and Dental University
Richard Foxton, King's College London Dental Institute
Masaomi Ikeda, Tokyo Medical and Dental University
Wuri Han, Showa University
Yo Shibata, Showa University
Takashi Miyazaki, Showa University
Junji Tagami, Tokyo Medical and Dental University


Objectives: The objective of this in-vitro study was to evaluate the 8-year microtensile bond strength (µTBS) durability and elastic modulus of adhesive layer of a one-step self-etch adhesive system (1-SEA) bonded to dentin.

Methods: Flat coronal dentin surfaces of extracted human third human molars were bonded with a one-step adhesive system, Clearfil SE One (Kuraray Noritake Inc., Japan) according to the manufacturer’s instruction. A hybrid resin composite (Shade A2, Clearfil AP-X, Kuraray Noritake) was used for the coronal build-up. After storage in water at 37oC for 24 hours, 5 and 8 years, the beam-shaped specimens were fabricated from the central part of each bonded tooth using a low-speed diamond saw under water spray coolant and subjected to µTBS testing at a crosshead speed of 1.0mm/min. Also, the elastic modulus of the adhesive layer was evaluated by nano-indentation. The data were statistically analyzed using a one-way ANOVA (α=0.05).

Results: The µTBS values were 59.1±10.0 (24hours), 60.7±11.8 (5years), and 53.6±11.4 (8years). There were no significant differences among the storage time (p>0.05).

Conclusions: The 8 years of water storage did not affect the µTBS of Clearfil SE One. The excellent µTBS durability may be due to its stability of the mechanical property of adhesive layer.
This work was supported by Grant-in-Aid for Research #26462873, #15K11108 and #17K17125 from MEXT of Japan.

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE