Halloysite nanotube incorporation into adhesive systems—effect on bond strength to human dentin

Mohammed S. Alkatheeri, Jadesada Palasuk, George J. Eckert, Jeffrey Platt, Marco C. Bottino

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Objectives: This study aimed to evaluate the effect of Halloysite® aluminosilicate clay nanotube (HNT) incorporation into a two-step etch-and-rinse (ER) and a one-step self-etch (SE) adhesive on human dentin shear bond strength (SBS). Materials and methods: Ten groups (n = 12) were prepared according to the adhesive system (i.e., ER or SE) and amount of HNT incorporated (5–20 %, w/v), as follows: commercial control (i.e., the adhesive was used as purchased, 0 % HNT); experimental control (i.e., the adhesive was processed through mixing/stirring and sonication similarly to the HNT-incorporated experimental groups, but without HNT); and 5, 10, and 20 % HNT. SBS testing was performed after 24 h of storage in deionized water at 37 °C. Failure modes were examined using a stereomicroscope (×40). Scanning electron microscopy (SEM) of the resin–dentin interface of selected specimens was carried out. Results: Two-way ANOVA revealed that incorporation of HNT up to 20 % (w/v) in ER and up to 10 % (w/v) in SE demonstrated an increased SBS compared to their experimental controls. Compared to the commercial control, SBS of HNT-modified dentin adhesives was not significantly different for ER adhesives (p > 0.05) but was significantly higher with 5 % HNT in the SE adhesive (p <0.05). Failure modes were predominantly adhesive and mixed failures. SEM micrographs of resin–dentin interfaces for ER-commercial control and ER-10 % showed a similar morphology. A thicker adhesive layer and the presence of agglomerated HNT on the resin tags were seen in ER-10 %. An increased number of short resin tags in SE-5 % compared with SE-commercial control were observed. Conclusions: HNT addition up to 20 % in ER and up to 10 % in SE showed increased SBS to dentin compared with the experimental control. Clinical relevance: HNT can be used not only to reinforce adhesive resins but also hold potential for the development of bioactive adhesives by the encapsulation of matrix metalloproteinase (MMP) inhibitors or anticariogenic agents.

Original languageEnglish (US)
Pages (from-to)1905-1912
Number of pages8
JournalClinical Oral Investigations
Volume19
Issue number8
DOIs
StatePublished - Feb 10 2015

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Nanotubes
Dentin
Adhesives
Shear Strength
Electron Scanning Microscopy
clay
Sonication
Matrix Metalloproteinase Inhibitors
Analysis of Variance

Keywords

  • Adhesive
  • Bond strength
  • Dentin
  • Halloysite
  • Nanotube
  • SEM

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Halloysite nanotube incorporation into adhesive systems—effect on bond strength to human dentin. / Alkatheeri, Mohammed S.; Palasuk, Jadesada; Eckert, George J.; Platt, Jeffrey; Bottino, Marco C.

In: Clinical Oral Investigations, Vol. 19, No. 8, 10.02.2015, p. 1905-1912.

Research output: Contribution to journalArticle

Alkatheeri, Mohammed S. ; Palasuk, Jadesada ; Eckert, George J. ; Platt, Jeffrey ; Bottino, Marco C. / Halloysite nanotube incorporation into adhesive systems—effect on bond strength to human dentin. In: Clinical Oral Investigations. 2015 ; Vol. 19, No. 8. pp. 1905-1912.
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AU - Palasuk, Jadesada

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AU - Platt, Jeffrey

AU - Bottino, Marco C.

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N2 - Objectives: This study aimed to evaluate the effect of Halloysite® aluminosilicate clay nanotube (HNT) incorporation into a two-step etch-and-rinse (ER) and a one-step self-etch (SE) adhesive on human dentin shear bond strength (SBS). Materials and methods: Ten groups (n = 12) were prepared according to the adhesive system (i.e., ER or SE) and amount of HNT incorporated (5–20 %, w/v), as follows: commercial control (i.e., the adhesive was used as purchased, 0 % HNT); experimental control (i.e., the adhesive was processed through mixing/stirring and sonication similarly to the HNT-incorporated experimental groups, but without HNT); and 5, 10, and 20 % HNT. SBS testing was performed after 24 h of storage in deionized water at 37 °C. Failure modes were examined using a stereomicroscope (×40). Scanning electron microscopy (SEM) of the resin–dentin interface of selected specimens was carried out. Results: Two-way ANOVA revealed that incorporation of HNT up to 20 % (w/v) in ER and up to 10 % (w/v) in SE demonstrated an increased SBS compared to their experimental controls. Compared to the commercial control, SBS of HNT-modified dentin adhesives was not significantly different for ER adhesives (p > 0.05) but was significantly higher with 5 % HNT in the SE adhesive (p <0.05). Failure modes were predominantly adhesive and mixed failures. SEM micrographs of resin–dentin interfaces for ER-commercial control and ER-10 % showed a similar morphology. A thicker adhesive layer and the presence of agglomerated HNT on the resin tags were seen in ER-10 %. An increased number of short resin tags in SE-5 % compared with SE-commercial control were observed. Conclusions: HNT addition up to 20 % in ER and up to 10 % in SE showed increased SBS to dentin compared with the experimental control. Clinical relevance: HNT can be used not only to reinforce adhesive resins but also hold potential for the development of bioactive adhesives by the encapsulation of matrix metalloproteinase (MMP) inhibitors or anticariogenic agents.

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KW - Dentin

KW - Halloysite

KW - Nanotube

KW - SEM

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