Geometric factors affecting dentin bonding in root canals

A theoretical modeling approach

Franklin Chi Meng Tay, Robert J. Loushine, Paul Lambrechts, R. Norman Weller, David Henry Pashley

Research output: Contribution to journalArticle

303 Citations (Scopus)

Abstract

Cavity configuration factor (C-factor) is the ratio of the bonded surface area in a cavity to the unbonded surface area. In a box-like class I cavity, there may be five times more bonded surface area than the unbonded surface area. During polymerization, the volume of monomers is reduced, which creates sufficient shrink-age stresses to debond the material from dentin, thereby decreasing retention and increasing leakage. The important variables influencing bonding adhesive root-filling materials to canals was examined using a truncated inverted cone model. C-factors in bonded root canals exhibit a negative correlation with sealer thickness. For a 20 mm-long canal prepared with a size 25 file, calculated C-factors ranged from 46 to 23,461 with decreasing sealer thickness (500-1 μm), compared to a C-factor of 32 when the canal was filled only with sealer. As the thickness of the adhesive is reduced, the volummetric shrinkage is reduced, which results in a reduction in shrinkage stress (S-factor). C-factors above 954 calculated with sealer thickness smaller than 25 μm are partially compensated by increases in bonding area and decreases in shrinkage volume. However, the interaction of these two geometrically related factors (C- and S-factors) predicts that bonding of adhesive root-filling materials to root canals is highly unfavorable when compared with indirect intracoronal restorations with a similar resin film thickness.

Original languageEnglish (US)
Pages (from-to)584-589
Number of pages6
JournalJournal of Endodontics
Volume31
Issue number8
DOIs
StatePublished - Jan 1 2005

Fingerprint

Dental Pulp Cavity
Root Canal Filling Materials
Dentin
Adhesives
Polymerization

Keywords

  • Bonding
  • C-factor
  • Relative shrinkage stress
  • Root dentin
  • Sealer width

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Geometric factors affecting dentin bonding in root canals : A theoretical modeling approach. / Tay, Franklin Chi Meng; Loushine, Robert J.; Lambrechts, Paul; Weller, R. Norman; Pashley, David Henry.

In: Journal of Endodontics, Vol. 31, No. 8, 01.01.2005, p. 584-589.

Research output: Contribution to journalArticle

Tay, Franklin Chi Meng ; Loushine, Robert J. ; Lambrechts, Paul ; Weller, R. Norman ; Pashley, David Henry. / Geometric factors affecting dentin bonding in root canals : A theoretical modeling approach. In: Journal of Endodontics. 2005 ; Vol. 31, No. 8. pp. 584-589.
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