Concurrent evaluation of composite internal adaptation and bond strength in a class-I cavity

Turki A. Bakhsh, Alireza Sadr, Yasushi Shimada, Mona M. Mandurah, Ilnaz Hariri, Ehab Z. Alsayed, Junji Tagami, Yasunori Sumi

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)


Objectives: This study investigated class-I cavity floor adaptation by swept-source optical coherence tomography (OCT) in combination with microtensile bond strength (MTBS) using different filling methods. Methods: Two adhesive systems; Tokuyama Bond Force and Tri-S Bond Plus were used in conjunction with a universal composite (Estelite Sigma Quick) placed either incrementally (oblique) or in bulk with or without a flowable composite lining (Palfique Estelite LV). Ten serial B-scan images were obtained throughout each cavity by OCT (center wavelength: 1319 nm). In order to evaluate adaptation defined as the cavity floor percentage showing no gap, a significant increase in the signal intensity was considered as gap at the bonded interface of the cavity floor. The same specimens were then cut into beams to measure MTBS at the cavity floor. Results: Two-way ANOVA demonstrated that the interaction of adhesive systems and filling techniques was significantly affecting both adaptation and MTBS (p < 0.05). There was a significant correlation between MTBS and adaptation at cavity floor (p < 0.05). Cavity floor adaptation and MTBS were improved when incremental filling technique was applied, while the outcome of lining technique was variable. Conclusions: Quantitative assessment by OCT can non-destructively provide information on the performance and effectiveness of dental composites and restoration techniques. There was a moderate correlation between floor adaptation and bond strength in class-I cavities. Incremental application of composite restoration showed the best performance in terms of bond strength and internal adaptation. Clinical significance: Incremental application of composite restoration was the most advantageous placement technique in terms of bond strength and internal adaptation. The lack of placement pressure with flowable composites may affect their adaptation to all-in-one adhesives; therefore, the outcome of cavity lining by flowable composite was variable.

Original languageEnglish
Pages (from-to)60-70
Number of pages11
JournalJournal of Dentistry
Issue number1
Publication statusPublished - Jan 2013
Externally publishedYes


  • Adaptation
  • Bond strength
  • Class-I cavity
  • Filling technique
  • OCT
  • Self-etch adhesives

ASJC Scopus subject areas

  • Dentistry(all)


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