Yield strength of fiber-reinforced composite posts with coronal retention.
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Yield strength of fiber-reinforced composite posts with coronal retention. / Schmage, Petra; Nergiz, Ibrahim; Platzer, Ursula; Pfeiffer, Peter.
in: J PROSTHET DENT, Jahrgang 101, Nr. 6, 6, 2009, S. 382-387.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - Yield strength of fiber-reinforced composite posts with coronal retention.
AU - Schmage, Petra
AU - Nergiz, Ibrahim
AU - Platzer, Ursula
AU - Pfeiffer, Peter
PY - 2009
Y1 - 2009
N2 - STATEMENT OF PROBLEM: Currently, glass fiber-reinforced composite (FRC) posts with shank heads are only recommended for moderate coronal defects. Restoring endodontically treated teeth with large coronal defects remains a challenge, requiring posts with coronal retention and high bending resistance. PURPOSE: The purpose of this in vitro study was to investigate the yield strengths of FRC posts and titanium posts (TI) with coronal retention for core foundations compared to FRC and TI posts without coronal retention. MATERIAL AND METHODS: Tapered posts (ER root post system) of 4 diameters (ISO 50, 70, 90, 110), 2 lengths (tapered part: 9 and 12 mm) of identical shape, 2 materials (FRC, titanium), and 2 head designs (shank without retention (SH) and post head with horizontal retention (RET)) were evaluated (n=9). Titanium posts (TI-SH, TI-RET) served as the control. The 0.2% yield strengths (R(0.2)) of all specimens were tested in a universal testing machine. Three-way and 1-way ANOVAs with Bonferroni-Dunn's multiple comparison tests were performed (alpha=.05). RESULTS: The yield strengths of the control groups TI-RET were significantly higher for ISO 110 with a 9-mm length and for ISO 70 and 110 with a 12-mm length, compared to the respective FRC-RET posts (P
AB - STATEMENT OF PROBLEM: Currently, glass fiber-reinforced composite (FRC) posts with shank heads are only recommended for moderate coronal defects. Restoring endodontically treated teeth with large coronal defects remains a challenge, requiring posts with coronal retention and high bending resistance. PURPOSE: The purpose of this in vitro study was to investigate the yield strengths of FRC posts and titanium posts (TI) with coronal retention for core foundations compared to FRC and TI posts without coronal retention. MATERIAL AND METHODS: Tapered posts (ER root post system) of 4 diameters (ISO 50, 70, 90, 110), 2 lengths (tapered part: 9 and 12 mm) of identical shape, 2 materials (FRC, titanium), and 2 head designs (shank without retention (SH) and post head with horizontal retention (RET)) were evaluated (n=9). Titanium posts (TI-SH, TI-RET) served as the control. The 0.2% yield strengths (R(0.2)) of all specimens were tested in a universal testing machine. Three-way and 1-way ANOVAs with Bonferroni-Dunn's multiple comparison tests were performed (alpha=.05). RESULTS: The yield strengths of the control groups TI-RET were significantly higher for ISO 110 with a 9-mm length and for ISO 70 and 110 with a 12-mm length, compared to the respective FRC-RET posts (P
M3 - SCORING: Zeitschriftenaufsatz
VL - 101
SP - 382
EP - 387
JO - J PROSTHET DENT
JF - J PROSTHET DENT
SN - 0022-3913
IS - 6
M1 - 6
ER -
