Effect of Endodontic Irrigating Solutions on the Micro Push-out Bond Strength of a Fibre Glass Dowel.
OBJECTIVE
To evaluate the effect of different endodontic irrigating solutions on the micro push-out bond strength of a fiber glass dowel.


METHODS
Seventy 16-mm long root segments of bovine incisors were prepared and randomly assigned to 7 groups (n=10) according to the type of irrigating solution used prior to the cementation of the intra-radicular fiber glass dowels: G1: 5.25% NaOCl + 17% EDTA; G2: 5.25% NaOCl; G3: 17% EDTA; G4: 2% chlorhexidine gel; G5: 70% alcohol; G6: 11.5% polyacrylic acid; and G7: saline (control). After treatment of intracanal dentin, the glass fibre dowels were cemented with self-adhesive resin cement (RelyX Unicem). Six slices with the thickness of 1.00 ± 0.05 mm were obtained from each tooth at the coronal, middle and apical root thirds (2 slices per third) using a low-speed saw. Micro push-out tests were performed at a crosshead speed of 0.5mm/min and the data (MPa) were analyzed statistically by ANOVA and Tukey's and Dunnett's tests.


RESULTS
There were statistically significant differences (p<0.0001) among the irrigating solutions, but no significant difference (p=0.0591) was found among the root thirds. G5 presented the highest bond strength mean of all groups (p<0.0001). The use of 70% alcohol increased the adhesion values by 53% compared to the group control.


CONCLUSIONS
The use of 70% alcohol increased the bond strength of the fiber glass dowel to the dentin walls. However, the push-out bond strength between the dowel and the root dentin was not affected by the root third (coronal, middle and apical).
Department of Dentistry, School of Dentistry, State University of Paraíba, Campina Grande, PB, Brazil .
Olimpia
O
Crispim da Silveira
Department of Dentistry, School of Dentistry, State University of Pernambuco, Camaragibe, PE, Brazil .
Rodivan
R
Bras da Silva
Department of Dentistry, School of Dentistry, Potiguar University, Natal, RN, Brazil .
Fabio Roberto
FR
Dametto
Department of Dentistry, School of Dentistry, Potiguar University, Natal, RN, Brazil .
Claudia Tavares
CT
Machado
Department of Dentistry, School of Dentistry, Potiguar University, Natal, RN, Brazil .
Alex Jose
AJ
Souza Dos Santos
Department of Dentistry, School of Dentistry, State University of Paraíba, Campina Grande, PB, Brazil .
Alessandro Leite
AL
Cavalcanti
Post and Core Technique; Root Canal Irrigants; Tensile Strength
Int Endod J. 2000 Jul;33(4):397-400
11307217
Eur J Oral Sci. 2005 Feb;113(1):70-6
15693832
J Dent. 1987 Aug;15(4):147-52
3312324
Am J Dent. 1994 Apr;7(2):81-4
8054190
J Dent. 1999 Jan;27(1):43-6
9922611
Dent Mater. 2001 Sep;17(5):373-80
11445203
J Dent Res. 1996 Sep;75(9):1706-15
8952625
J Endod. 2009 Jul;35(7):1023-7
19567327
Am J Dent. 1996 Feb;9(1):11-4
9002807
Dent Mater. 2000 Sep;16(5):311-23
10915892
Am J Dent. 1999 Aug;12(4):177-80
10649923
J Oral Rehabil. 1999 Oct;26(10):836-40
10564442
Braz Dent J. 1994;5(1):65-70
7833645
J Endod. 2003 Apr;29(4):248-51
12701772
J Clin Pediatr Dent. 1998 Summer;22(4):299-305
9796499
J Biomed Mater Res. 2002 May;60(2):316-24
11857439
J Endod. 2001 Dec;27(12):753-7
11771583
Quintessence Int. 1994 Sep;25(9):587-9
7568709
Oper Dent. 1994 May-Jun;19(3):82-90
9028245
J Endod. 2001 Jun;27(6):411-4
11487137
Oral Surg Oral Med Oral Pathol. 1974 May;37(5):803-11
4524386