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The effect of apical foramen patency on condensation stresses
Author(s) -
Gimlin Dennis R.,
Parr Charles H.,
AguirreRamirez Gilbert
Publication year - 1986
Publication title -
dental traumatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.82
H-Index - 81
eISSN - 1600-9657
pISSN - 1600-4469
DOI - 10.1111/j.1600-9657.1986.tb00157.x
Subject(s) - apical foramen , constriction , apical constriction , foramen , stress (linguistics) , root canal , dentin , anatomy , apex (geometry) , materials science , orthodontics , medicine , composite material , chemistry , biochemistry , morphogenesis , linguistics , philosophy , gene
Mathematical models and computer‐based engineering tools were used to evaluate the effect of a patent or closed apical foramen on stresses that are produced within gutta‐percha during condensation. We examined a mathematical model of a tapered canal with a definite constriction and compared the results when the apical foramen was closed or open. When the canal was closed an almost constant stress was seen throughout the gutta‐percha. When the foramen was open a sharp increase in lateral stress was observed in the apical portions of the canal. The constriction near the foramen caused the gutta‐percha to be squeezed together and the stress was increased. This increases the likelihood that the gutta‐percha is well adapted to the apical constriction. However, the stresses are also transferred to the surrounding dentin, resulting in a stress concentration near the apical foramen where the bulk of dentin is minimal.