Microtensile bond strength of a dual-cure resin core material to glass and quartz fibre posts.
OBJECTIVE
To evaluate the microtensile bond strength (microTBS) of a dual-cure resin core material to different regions of fibre posts using different surface treatments.


METHODS
Twenty-five silica zirconium glass fibre posts (Snowpost) and 25 quartz fibre posts (Aestheti-Plus) were used and randomly divided into five groups according to the surface treatments: (1) no surface treatment (Control) (2) dual-cure bonding agent, Clearfil Liner Bond 2V (LB) (3) LB followed by light curing for 20 s (LB and C) (4) silane coupling bonding agent agent, Clearfil Photobond with Porcelain Bond Activator (PB+PBA) (5) PB+PBA followed by light curing for 20 s (PB+PBA and LC). Treated posts were cemented into artificial post cavities using a dual-cure composite core material (Clearfil DC Core) and cured for 60 s from the top of the cavity. After 24 h storage in water, each specimen was serially sliced into 8, 0.6 x 0.6 mm2-thick beams for the microTBS test. The data were divided into three regions (upper/middle/bottom) and analyzed using three-way ANOVA and Dunnet's T3 multiple comparisons (alpha=0.05).


RESULTS
There were no significant differences in bond strength between the three regions (p>0.05). The bond strengths were enhanced by the application of a silane coupling agent. For Snowpost, photoirradiation of the dual-cure bonding agent applied to the post surface significantly improved the bond strength (p<0.05) whereas it did not affect the bond strength of Aestheti-Plus post (p>0.05).


CONCLUSIONS
The bond strength between fibre post and dual-cure resin core material depends upon the type of post and surface treatment. There were no regional differences in microTBS of the bonded post.
Aksornmuang
Juthatip
J
Cariology and Operative Dentistry, Department of Restorative Science, Tokyo Medical and Dental University, Graduate School, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. juthatip.ope@tmd.ac.jp
Foxton
Richard M
RM
Nakajima
Masatoshi
M
Tagami
Junji
J
D003188:Composite Resins / Q000528:radiation effects; D001840:Dental Bonding; D003738:Dental Cements; D003799:Dental Stress Analysis / Q000379:methods; D017220:Dentin-Bonding Agents; D005898:Glass; D008027:Light; D008422:Materials Testing; D008689:Methacrylates; D011176:Post and Core Technique; D011791:Quartz; D019279:Resin Cements; D012821:Silanes; D013499:Surface Properties
C469237:Clearfil Core; C112274:Clearfil Liner Bond 2; C076805:Clearfil Porcelain Bond; D003188:Composite Resins; D003738:Dental Cements; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D019279:Resin Cements; D012821:Silanes; C009753:fiberglass; C074669:Clearfil Photo Bond; D011791:Quartz