Baltic Dental and Maxillofacial Journal
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September, 2010, Vol. 12, No. 3


© 2010 Stomatologija

Stomatologija 2010; 12 (3): 73-9 338 KB

Effect of conditioner on microtensile bond strength of self-adhesive resin cements to dentin

Daniela Tonial, Paula Cristine Ghiggi, André Amorim Lise, Luiz Henrique Burnett Júnior, Hugo Mitsuo Silva Oshima, Ana Maria Spohr


Objective. Evaluate, in vitro, the microtensile bond strength (µTBS) of RelyX ARC conventional resin cement and RelyX Unicem and Maxcem self-adhesive resin cements to dentin, and the influence of polyacrylic acid pretreatment on the µTBS.

Material and Methods. Flat dentin surfaces were obtained in 15 third molars which were randomly divided into 5 groups: Group 1 – RelyX ARC (control); Group 2 – RelyX Unicem; Group 3 – Maxcem Elite; Group 4 – 22.5% polyacrylic acid and RelyX Unicem; Group 5 – 22.5% polyacrylic acid and Maxcem Elite. A block of composite resin was built over the resin cements. The samples were sectioned to obtain beams, and 20 specimens for each group were submitted to µTBS on a universal testing machine. Failure modes were analyzed by scanning electron microscopy.

Results. According to ANOVA and Tukey test, the highest µTBS mean (MPa) was obtained with RelyX ARC (21.38), which did not differ statistically from Maxcem Elite with polyacrylic acid pretreatment (19.22) and RelyX Unicem with polyacrylic acid pretreatment (17.75) (p>0.05). The latter two groups did not differ statistically from RelyX Unicem (16.98) (p>0.05). The lowest mean was obtained for Maxcem Elite (6.43), which differed statistically from the other groups (p<0.05). All failures were adhesive for Maxcem Elite without polyacrylic acid pretreatment, and mixed failures were predominant in the other groups.

Conclusions. RelyX ARC achieved higher µTBS to dentin in comparison to the self-adhesive resin cements. Polyacrylic acid pretreatment was effective in improving the µTBS of Maxcem Elite, but did not influence the µTBS for RelyX Unicem.

Key words: dentin, bond strength, resin cements, polyacrylic acid.

Received: 20 10 2009

Accepted for publishing: 23 09 2010

*Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Brazil

Daniela Tonial* – D.D.S., M.S., Master degree student in Restorative Dentistry

Paula Cristine* – Ghiggi, D.D.S., M.S., Master degree student in Restorative Dentistry

André Amorim Lise* – D.D.S. - Undergraduate student of Dentistry

Luiz Henrique Burnett Júnior* – D.D.S., Ph.D., Adjunt Professor of Restorative Dentistry

Hugo Mitsuo Silva Oshima* – D.D.S., PhD., Adjunt Professor of Dental Materials

Ana Maria Spohr* – D.D.S., Ph.D.- Adjunt Professor of Dental Materials

Address correspondence to Prof. Ana Maria Spohr, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga 6681, Porto Alegre, Rio Grande do Sul, Brazil