Effects of Dentin Characteristics on Interfacial Nanoleakage

Abstract

Water emanating from dentinal tubules during air-drying and light-curing of adhesives leads to entrapment of droplets at the resin-dentin interface and contributes to nanoleakage. This study tested the null hypothesis that characteristics of substrate dentin and type of adhesive used for bonding would not affect the occurrence of nanoleakage. Three self-etch adhesives were used to bond to 4 types of dentin with different characteristics in 12 groups. After silver challenge, nanoleakage percentage was measured within the hybrid layer of each sample. The deep dentin cut perpendicular to tubules always showed a significantly higher nanoleakage percentage compared with that of the other 3 types of dentin. The percentages of nanoleakage within the hybrid layers were not statistically different among adhesives. However, when bonding to deep perpendicular dentin, both all-in-one adhesives revealed more distinct nanoleakage within the adhesive layer compared with that achieved with Clearfil SE Bond, a two-step self-etch adhesive. The results did not support the null hypothesis.

Effect of smear layer characteristics on dentin bonding durability of HEMA-free and HEMA-containing one-step self-etch adhesives

“…These results would indicate that S 3 expresses less nanoleakage within the hybrid layer as well as water-tree nanoleakage. This result is in agreement with the previous study using a TEM 36) . HEMA can improve the bond strength to dentin, enhancing wetting of the dentin subsurface 37) , and preventing phase separation between the hydrophobic components and water 23) , resulting in the absence of water-tree nanoleakage formation.…”

3D Micro-Crack Propagation Simulation at Enamel/Adhesive Interface Using FE Submodeling and Element Death Techniques

“…The morphology of micro-bonding structures also significantly influences the bonding capability. 9,16,36,38 However, the information about the stress pattern and crack propagation at the bonded interface with the resin tags is unknown. In this study, the FE submodeling and element death techniques are proposed to investigate the 3D micro-mechanical behaviors at the bonded interface under shear bond testing.…”

“…Various resin tag penetration lengths and shapes caused by etching patterns and prism orientation influence the interfacial bonding performance. 9,16,36,38 However, the stress that transfers from the resin tags to the enamel substrate under a load is not clear. Presently, most fracture tests evaluate the structural performance without incorporating any means of relating the fracture path to the intrinsic structural properties.…”

Effect of dentin depth on hybridization quality using different bonding tactics in vivo

“…30 Our previous study found that the hybridization quality of TB decreased more distinctly in comparison with SE when bonding to deep perpendicular dentine in vitro. 31 Strong air-blow after application of one-step adhesives was reported to be an effective method for removing excessive interfacial water and solvent. 32 However, this technique would cause more evaporative water flux to be shifted from dentinal tubules and entrapped into interfibrillar spaces of partially hydroxyapatite-depleted collagen fibrils.…”