Microtensile bond strength of glass fiber posts cemented with self-adhesive and self-etching resin cements.
OBJECTIVE
To evaluate the bond strength of glass fiber posts to intraradicular dentin when cemented with self-etching and self-adhesive resin cements.


METHODS
Forty-eight single-rooted human teeth were decoronated, endodontically treated, post-space prepared and divided into 8 groups (n = 6). The glass fiber posts used were: Exacto (EA) (Angelus) and everStick (ES) (StichTeck), which were cemented with two self-adhesive resin cements: BisCem (BIS) (Bisco) and Rely-X Unicem (UNI) (3M/ESPE), and two self-etching resin cements: Esthetic Cementing System NAC100 (NAC) (Kuraray) and Panavia-F (PAN) (Kuraray). Specimens were thermocycled between 5°C and 55 °C for 1000 cycles and stored in water at 37°C for 1 month. Four 1-mm-thick (in cross section) rods were obtained from the cervical region of the roots. Specimens were then subjected to microtensile testing in a special machine (BISCO; Schaumburg, IL, USA) or a crosshead speed of 0.5 mm/min. Microtensile bond strength (μTBS) data were analyzed with two-way ANOVA and Tukey's tests.


RESULTS
Means (and SD) of μTBS (MPa) were: EA/PAN: 10.3 (4.1), EA/NAC: 14 (5.1) EA/BIS: 16.4 (4.8), EA/UNI: 19.8 (5.1), ES/PAN: 25.9 (6.1), ES/NAC: 29.1 (7), ES/BIS: 28.9 (6), ES/UNI: 30.5 (6.6). ANOVA indicated significant differences among the groups (p < 0.001). Mean μTBS values obtained with ES post were significantly higher than those obtained with EA (p < 0.001). For EA, Tukey's test indicated that higher μTBS means were obtained with the self-adhesive resin cements (BIS and UNI), which were statistically significantly different (p < 0.05) from values obtained with the self-etching resin cements (PAN and NAC). Different cements had no significant effects on the bond strength values of ES post (p > 0.05). μTBS values obtained with ES post were significantly higher than those obtained with EA post irrespective of the resin cement used.


CONCLUSIONS
everStick posts resulted in the highest mean μTBS values with all cements. Self-adhesive cements performed well in terms of bond strength.
Department of Dentistry, University of Ribeirão Preto, Uniaerp, Ribeirão Preto, Brazil.
Suellen
S
Zaitter
Manoel D
MD
Sousa-Neto
Renato C
RC
Roperto
Yara T
YT
Silva-Sousa
Omar
O
El-Mowafy
D000134:Acid Etching, Dental / Q000379:methods*; D000704:Analysis of Variance; D003188:Composite Resins; D001840:Dental Bonding; D003799:Dental Stress Analysis; D003804:Dentin; D005898:Glass; D006801:Humans; D008422:Materials Testing; D011176:Post and Core Technique; D019279:Resin Cements; D018709:Statistics, Nonparametric; D013718:Tensile Strength
D003188:Composite Resins; D019279:Resin Cements; C009753:fiberglass