Relationship between non-destructive OCT evaluation of resins composites and bond strength in a cavity

T. A. Bakhsh, A. Sadr, Y. Shimada, S. Khunkar, J. Tagami, Y. Sumi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)


Objectives: Formation of microgaps under the composite restorations due to polymerization stress and other causes compromise the adhesion to the dental substrate and restoration durability. However, the relationship between cavity adaptation and bond strength is not clear. In this paper, we introduce a new testing method to assess cavity adaptation by swept-source optical coherence tomography (SS-OCT) and microtensile bond strength (MTBS) in the same class-I cavity. Methods: Round class-I cavities 3 mm in diameter and 1.5 mm in depth were prepared on 10 human premolars. After application of Tokuyama Bond Force adhesive, the cavities were filled by one of the two techniques; incremental technique using Estelite Sigma Quick universal composite or flowable lining using Palfique Estelite LV with bulk filling using the universal composite. Ten serial B-scan images were obtained throughout each cavity by SS-OCT. Significant peaks in the signal intensity were detected at the bonded interface of the cavity floor and to compare the different filling techniques. The specimens were later cut into beams (0.7×0.7 mm) and tested to measure MTBS at the cavity floor. Results: Flowable lining followed by bulk filling was inferior in terms of cavity adaptation and MTBS compared to the incremental technique (p<0.05, t-test). The adaptation (gap free cavity floor) and MTBS followed similar trends in both groups. Conclusion: Quantitative assessment of dental restorations by OCT can provide additional information on the performance and effectiveness of dental composites and restoration techniques. This study was supported by Global Center of Excellence, Tokyo Medical and Dental University and King Abdulaziz University.

Original languageEnglish
Title of host publicationLasers in Dentistry XVIII
Publication statusPublished - Jun 12 2012
Externally publishedYes
EventLasers in Dentistry XVIII - San Francisco, CA, United States
Duration: Jan 22 2012Jan 22 2012

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ISSN (Print)1605-7422


OtherLasers in Dentistry XVIII
Country/TerritoryUnited States
CitySan Francisco, CA


  • SS-OCT
  • dental adhesive
  • dental composite
  • dentin
  • interface
  • microtensile
  • tooth

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging


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