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Failure characteristics of endodontically treated premolars restored with a post and direct restorative material
Author(s) -
HUYSMANS M.C. D. N. J. M.,
PETERS M. C. R. B.,
PLASSCHAERT A. J. M.,
VARST P. G. T.
Publication year - 1992
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/j.1365-2591.1992.tb00774.x
Subject(s) - premolar , amalgam (chemistry) , cermet , materials science , dentistry , significant difference , composite number , tooth fracture , orthodontics , composite material , molar , medicine , ceramic , chemistry , electrode
Summary Ninety‐one extracted maxillary premolar teeth were restored with a prefabricated post and amalgam, composite resin or glass‐cermet core. Each group was again divided into three groups of 9–13 teeth to be subjected to an increasing load in one of three standardized directions (10, 45 and 90° to the long axis of the tooth). Failure load and characteristics of failure were recorded. The glass‐cermet‐restored teeth had a lower strength than the other groups for every load direction (Student's t ‐test: P < 0.01). Amalgam and composite resin groups showed a significant difference only for the 10% loading condition (Student's t est: P < 0.02). Teeth restored with amalgam cores displayed a higher mean failure load, in combination with a 46% occurrence of root fracture.