Comparison of micro push-out bond strengths of two fiber posts luted using simplified adhesive approaches

Abstract

By means of a micro push-out test, this study compared the bond strengths of two types of fiber-reinforced posts cemented with luting cements based on two currently available adhesive approaches as well as evaluated their failure modes. Sixty extracted single-rooted human maxillary central incisor and canine teeth were sectioned below the cementoenamel junction, and the roots were endodontically treated. Following standardized post space preparation, the roots were divided into two fiber post groups and then further into three subgroups of 10 specimens each according to the luting cements. A push-out test was performed to measure regional bond strengths, and the fracture modes were evaluated using a stereomicroscope. At the root section, there were no statistically significant differences (p>0.05) in push-out bond strength among the tested luting cements. Nevertheless, the push-out bond strength values of glass fiberreinforced posts were higher than those of carbon fiber-reinforced posts, irrespective of the adhesive approach used. On failure mode, the predominant failure mode was adhesive failure between dentin and the luting cement.

Effect of Different Surface Treatments on Cone Beam Computed Tomography Image and Push Out Bond Strength of Conventional and Reinforced Fiber Posts.

“…On the contrary, Mumcu et al 73 found that there is significant effect of root region on push-out bond strength. Irrespective of post type, highest bond strength values were achieved in the cervical region, whereas the lowest values were obtained in the apical region.…”

Influence of the flexural modulus of prefabricated and experimental posts on the fracture strength and failure mode of composite resin cores

“…In the previous studies that investigated the bond strength of composite resin luting cement to root canal-wall dentin, human teeth were used to simulate the clinical conditions 15,16) . However, human teeth have different lengths and mesiodistal and buccolingual widths 17) .…”

Effect of Chlorhexidine and Ethanol Application on Longterm Push-out Bond Strength of Fiber Posts to Dentin

“…7 These factors may impair immediate bond strength and durability over time. 2 The use of ethanol as an auxiliary method of conditioning intraradicular dentin has been proposed for controlling dentinal moisture and enhancing bond durability. 8 This technique consists of applying ethanol before applying a two-step self-etching or a three-step etch-and-rinse adhesive system, so that the remaining water may be replaced with ethanol.…”

“…As a consequence, fractures occur less frequently and in a more favorable manner, meaning that fractures are reparable in most of the cases. 2 However, many factors may affect the bond strength between the fiber post, the cement and the root canal, such as dentin hydration, type of conditioning agent and the cement used as well as length, conformation and diameter of intraradicular retainers, and the different anatomical features, density and orientation of dentinal tubules in different depths of root canal. 2,3,5,6 Additional factors may also represent a significant challenge in the cementation procedures, such as the difficulty of light transmission to the apical portion of the root, the limited direct observation inside the root canal, the difficulty in controlling moisture and the application of adhesive…”

“…[1][2][3] These posts have a modulus of elasticity similar to that of dentin. 2,4 Their advantages includeperforming cementations without causing friction on the root canal walls, reducing vertical fractures in the root and distributing occlusal forces more uniformly. As a consequence, fractures occur less frequently and in a more favorable manner, meaning that fractures are reparable in most of the cases.…”