Abstract
The aim of this pilot study was to evaluate the shear bond strength of superficial bovine incisor dentin in different crown regions. Bonding was performed to the incisal, middle and cervical thirds of superficial bovine coronal dentin (n = 20) with a two-step etch-and-rinse adhesive (Optibond Solo Plus) and resin composite (Z100). Shear bond strength was evaluated at 24 h and failure modes of representative specimens wereobserved with FE-SEM. Non-parametric Kruskal-Wallis test with a significance level of 0.05 was used for data analysis. Mean shear bond strength values for the incisal, middle, and cervical thirds were 36.9 (3.1), 42.6 (2.6), and 37.1 (2.1) respectively with no significant differences evidenced between the crown thirds (p = 0.19). Observation of the failure mode of representative specimens demonstrated that specimens with high bond strength values exhibited predominantly mixed-type failures whereas low strength specimens exhibited adhesive failures between the dentin and adhesive. The absence of significant differences in shear bond strength between crown thirds indicate that, regardless of tubule orientation, any crown region can be used when superficial bovine incisor dentin is used for shear bond strength testing.
Highlights
Adhesion to tooth structure, in particular to dentin, has been an area of extensive research in the last few decades [1,2,3]
The absence of significant differences in shear bond strength between crown thirds indicate that, regardless of tubule orientation, any crown region can be used when superficial bovine incisor dentin is used for shear bond strength testing
The highest and middle shear bond strength (SBS) values showed predominately a mixed-type failure mode, except the middle SBS value corresponding to the cervical third, which failed adhesively
Summary
In particular to dentin, has been an area of extensive research in the last few decades [1,2,3]. The mechanism of hybridization by which resin monomers infiltrate the partially demineralized collagen network is highly complex and dependent on a number of variables [4], of which the substrate, dentin, is perhaps the single most critical aspect due to the large morphological variability known to exist between different teeth and in various regions of the same tooth [5]. Compared to human molars, dentinal tubules from bovine incisors have been reported to be of larger size and have more porous intertubular dentin [13]. In this regard, according to Nakamichi, only superficial bovine dentin may be considered a suitable substitute to human dentin [9]
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