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Parapulpal pins and their effects on the fracture resistance of pin‐retained cores
Author(s) -
HALLER B.,
GÖTZE W.,
WEISS G.
Publication year - 1991
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.1991.tb01691.x
Subject(s) - materials science , composite material , fracture (geology) , amalgam (chemistry) , flexural strength , composite number , glass ionomer cement , core (optical fiber) , chemistry , electrode
Summary The bending characteristics of various parapulpal pins, the retention of a parapulpal pin in different core buildup materials, and the fracture resistance of pin‐retained cores were investigated in an in‐vitro study. In amalgam and composite cores, the use of parapulpal pins produced an increase in fracture resistance. The highest fracture resistance values were observed in amalgam cores, and the lowest fracture strength was exhibited by cores of glass ionomer cements (GICs) containing metallic particles. The different parapulpal pins and their flexural rigidity had little effect on the fracture resistance of the pin‐retained cores. For extensive pin‐retained cores it appears advisable to use GICs with restraint and, particularly in the case of large‐scale bridge reconstructions, only after critical examination of the loading conditions.