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In vitro evaluation of the retention of composite fiber and stainless steel posts
Author(s) -
Gallo John R.,
Miller Troy,
Xu Xiaoming,
Burgess John O.
Publication year - 2002
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.2002.00025.x
Subject(s) - materials science , cementoenamel junction , ultimate tensile strength , zinc phosphate , universal testing machine , composite material , composite number , cement , dowel , fiber , crosshead , fiber reinforced composite , glass fiber , dentistry , molar , corrosion , medicine
Purpose This study compared the tensile retentive strength of composite fiber‐reinforced dowels luted with a resin cement to stainless steel dowels luted with zinc phosphate cement. Materials and Methods The crowns of 40 extracted human mandibular premolars were removed with a separating disc 1‐mm coronal to the cementoenamel junction. The teeth were randomly divided into 4 groups ( n = 10 ). A post space was prepared in each specimen to a depth of 9 mm, using the drill supplied by the respective manufacturer. For the stainless steel post group, 1.25‐mm‐diameter posts were cemented with zinc phosphate cement. For the composite fiber reinforced groups, posts with diameters of 1.00, 1.25, and 1.50 mm were luted with a Bisphenol A‐Glycidyl Methacrylate (BIS‐GMA) resin bonding system (Jeneric/Pentron, Wallingford, CT) according to manufacturer specifications. The specimens were stored in a sealed container with a moist environment for 24 hours, placed in a fixture in an 801 Materials Test Systems (MTS) machine (MTS Systems Corp, Minneapolis, MN), and loaded in tension at a rate of 5.0 mm/min until failure. Differences among the 4 groups were determined using a one‐way analysis of variance and Tukey‐B post‐hoc tests (α= 0.05). Results The mean loads to failure ranged from 43.9 ± 10.4 kg for the stainless steel dowel group to 19.9 ± 5.7 kg for the composite fiber–reinforced 1.00‐mm‐diameter group. The stainless steel post luted with zinc phosphate cement provided significantly greater tensile resistance than all composite fiber dowel groups. The retention of the 1.00‐mm composite fiber–reinforced post was significantly less than the remaining groups. Conclusions Under the conditions of this study, the stainless steel dowel luted with zinc phosphate cement provided significantly greater retention.