Microgaps and demineralization progress around composite restorations

A. Turkistani, S. Nakashima, Yasushi Shimada, J. Tagami, A. Sadr

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

This study investigated the influence of adhesives and marginal sealing on demineralization progress using optical coherence tomography (OCT). Cavities (4 × 2 mm) were prepared in bovine incisors and restored using Clearfil SE Protect (SP), Bond Force (BF), Scotchbond Universal (SB), or G-Bond Plus (GB), followed by Estelite Flow Quick flowable composite. The control group received no adhesive (n = 10). After 3-d incubation in artificial saliva and 10,000 thermal cycles, gaps at enamel and dentin margins were measured at 8 locations on cross-sectional images obtained from each restoration using swept-source OCT at 1310-nm wavelength. Specimens were demineralized using acidified gel (pH = 4.5) for 5 wk and scanned every week to monitor the lesion progress at the same marginal locations. Repeated-measures analysis of variance showed that demineralization period and adhesive type and their interaction had a significant effect on the lesion size in both substrates (P < 0.001). SP, BF, and SB had significantly lower enamel and dentin initial gaps than the control and GB (P < 0.05). Enamel lesion progress was slower in the fluoride-releasing adhesives SP and BF and significantly different from SB, GB, and the control (P < 0.001). SP and BF dentin lesions were significantly different from GB and the control (P < 0.001), but not from SB (P > 0.05). A significant positive correlation (P < 0.05) was found between initial gap length and formed lesion size in both substrates, which was stronger in enamel (r = 0.63) than dentin (r = 0.35). Microgaps forming at the margins of restorations depend on adhesives and significantly contribute to the progress of demineralization around the margins, while fluoride release may decrease the rate of progression.

Original languageEnglish
Pages (from-to)1070-1077
Number of pages8
JournalJournal of Dental Research
Volume94
Issue number8
DOIs
Publication statusPublished - Aug 25 2015
Externally publishedYes

Fingerprint

Adhesives
Optical Coherence Tomography
Dentin
Dental Enamel
Artificial Saliva
Incisor
Fluorides
Analysis of Variance
Hot Temperature
Gels
Control Groups

Keywords

  • adhesives
  • composite resins
  • demineralization
  • fluoride(s)
  • imaging
  • microleakage

ASJC Scopus subject areas

  • Dentistry(all)
  • Medicine(all)

Cite this

Microgaps and demineralization progress around composite restorations. / Turkistani, A.; Nakashima, S.; Shimada, Yasushi; Tagami, J.; Sadr, A.

In: Journal of Dental Research, Vol. 94, No. 8, 25.08.2015, p. 1070-1077.

Research output: Contribution to journalArticle

Turkistani, A. ; Nakashima, S. ; Shimada, Yasushi ; Tagami, J. ; Sadr, A. / Microgaps and demineralization progress around composite restorations. In: Journal of Dental Research. 2015 ; Vol. 94, No. 8. pp. 1070-1077.
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