Cross-sectional imaging of tooth bonding interface after thermal stresses and mechanical fracture

Minh Nguyet Luong, Yasushi Shimada, Alireza Sadr, Masahiro Yoshiyama, Yasunori Sumi, Junji Tagami

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This study determined the influence of thermocycling (TC) and flowable composite on microtensile bond strength (MTBS), crack formation and mechanical properties of the bonding interface using swept-source optical coherence tomography (SS-OCT) and nanoindentation. MTBS test beams prepared from human dentin bonded with self-etch adhesive and hybrid composite with or without flowable lining were aged for either 0 or 10,000 thermocycles, resulting in 4 groups of specimens according to the placement technique and TC (n=10). 2D images were obtained before and after MTBS test to detect crack at interface using SS-OCT. Hardness across resin-dentin bonding area were measured using nanoindentation. Two-way ANOVA showed that flowable lining significantly increased MTBS (p<0.05). TC significantly increased crack percentage in composite while there was no significant difference in dentin crack. Moreover, TC significantly affected the hardness of dentin and resin composites (p<0.05). SS-OCT is effective in detecting internal fracture in substrate.

Original languageEnglish
Pages (from-to)754-760
Number of pages7
JournalDental Materials Journal
Volume37
Issue number5
DOIs
Publication statusPublished - Jan 1 2018

Fingerprint

Stress Fractures
Thermal cycling
Dentin
Thermal stress
Optical tomography
Tooth
Optical Coherence Tomography
Hot Temperature
Imaging techniques
Hardness
Composite materials
Nanoindentation
Cracks
Linings
Resins
Composite Resins
Analysis of variance (ANOVA)
Crack initiation
Adhesives
Analysis of Variance

Keywords

  • Internal fracture
  • Micro-tensile bond strength test
  • Nanoindentation
  • OCT
  • Resin composite

ASJC Scopus subject areas

  • Ceramics and Composites
  • Dentistry(all)

Cite this

Cross-sectional imaging of tooth bonding interface after thermal stresses and mechanical fracture. / Luong, Minh Nguyet; Shimada, Yasushi; Sadr, Alireza; Yoshiyama, Masahiro; Sumi, Yasunori; Tagami, Junji.

In: Dental Materials Journal, Vol. 37, No. 5, 01.01.2018, p. 754-760.

Research output: Contribution to journalArticle

Luong, Minh Nguyet ; Shimada, Yasushi ; Sadr, Alireza ; Yoshiyama, Masahiro ; Sumi, Yasunori ; Tagami, Junji. / Cross-sectional imaging of tooth bonding interface after thermal stresses and mechanical fracture. In: Dental Materials Journal. 2018 ; Vol. 37, No. 5. pp. 754-760.
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