Microtensile bond strength of quartz fiber posts to different composite cores

Abstract

The aim of this in vitro study was to assess the microtensile bond strength of quartz fiber posts to different composites, and to composite combinations used as core materials. Thirty fiber posts were treated with a 24% hydrogen peroxide solution and silanized. The posts were divided into 5 groups according to the resin composite used as follows (n = 6): G1 - Ælite Flow (Bisco, Inc), G2 - Filtek Z250 (3M ESPE), G3 - Biscore (Bisco, Inc), G4 - Ælite Flow + Filtek Z250, G5 - Ælite Flow + Biscore. The resin composites were placed around the posts to produce cylindrical specimens. Two 1-mm² thick sticks containing the post in the center and composite cores on both ends were provided from each cylinder and tested for microtensile strength with a crosshead speed of 0.5 mm/min. One-way ANOVA and Tukey HSD tests were used for statistical analysis. Fractured surfaces were observed using a stereomicroscope with 20× magnification. Scanning electron microscopy (SEM) was used to evaluate the interface of the fractured sticks. The results showed that G2 had the highest bond strength values, and the lowest values were seen with G3. There were significant differences between groups 1, 2, 4 and groups 3, 5 (p < 0.05). Under the stereomicroscope, most of the failures were adhesive between the post and core material. Under SEM, Ælite and Z250 had smoother surfaces than Biscore, containing less porosities and voids.

Bond Strength Performance of Resin Core Material with Glass Fiber Post: An In Vitro Study

“…In both group II and group III 19, out of 20 specimens showed adhesive failure. The findings of the present study are consistent with the observation of Sadek et al (2007) 11 , and Zahra Khamverdi et al, (2011) 9 .…”

Evaluation of surface roughness and bond strength of quartz fiber posts after various pre-treatments

“…An important characteristic of fiber posts is their similar elastic modulus to dentine (» 20 GPa), resin cement and resin core materials, producing a stress field similar to that of natural teeth, thus yielding a protective effect against root fracture [1,3,[5][6][7][8][9][10][11][12][13][14][15][16]. Conversely, titanium, stainless steel and zirconia have elastic moduli (110 GPa, 200 GPa, 210 GPa, respectively) well above that of dentine (18 GPa) [8].…”