TY - JOUR
T1 - Fatigue stipulation of bulk-fill composites
T2 - An in vitro appraisal
AU - Vidhawan, Shruti A.
AU - Yap, Adrian U.
AU - Ornaghi, Barbara P.
AU - Banas, Agnieszka
AU - Banas, Krzysztof
AU - Neo, Jennifer C.
AU - Pfeifer, Carmem S.
AU - Rosa, Vinicius
N1 - Publisher Copyright:
© 2015 Academy of Dental Materials.
PY - 2015/9/1
Y1 - 2015/9/1
N2 - Abstract Objectives The aim of this study was to determine the Weibull and slow crack growth (SCG) parameters of bulk-fill resin based composites. The strength degradation over time of the materials was also assessed by strength-probability-time (SPT) analysis. Methods Three bulk-fill [Tetric EvoCeram Bulk Fill (TBF); X-tra fil (XTR); Filtek Bulk-fill flowable (BFL)] and a conventional one [Filtek Z250 (Z250)] were studied. Seventy five disk-shaped specimens (12 mm in diameter and 1 mm thick) were prepared by inserting the uncured composites in a stainless steel split mold followed by photoactivation (1200 mW/cm2/20 s) and storage in distilled water (37°C/24 h). Degree of conversion was evaluated in five specimens by analysis of FT-IR spectra obtained in the mid-IR region. The SCG parameters n (stress corrosion susceptibility coefficient) and σf0 (scaling parameter) were obtained by testing ten specimens in each of the five stress rates: 10-2, 10-1, 100, 101 and 102 MPa/s using a piston-on-three-balls device. Weibull parameter m (Weibull modulus) and σf0 (characteristic strength) were obtained by testing additional 20 specimens at 1 MPa/s. Strength-probability-time (SPT) diagrams were constructed by merging SCG and Weibull parameters. Results BFL and TBF presented higher n values, respectively (40.1 and 25.5). Z250 showed the highest (157.02 MPa) and TBF the lowest (110.90 MPa) σf0 value. Weibull analysis showed m (Weibull modulus) of 9.7, 8.6, 9.7 and 8.9 for TBF, BFL, XTR and Z250, respectively. SPT diagram for 5% probability of failure showed strength decrease of 18% for BFL, 25% for TBF, 32% for XTR and 36% for Z250, respectively, after 5 years as compared to 1 year. Significance The reliability and decadence of strength over time for bulk-fill resin composites studied are, at least, comparable to conventional composites. BFL shows the highest fatigue resistance under all simulations followed by TBF, while XTR was at par with Z250.
AB - Abstract Objectives The aim of this study was to determine the Weibull and slow crack growth (SCG) parameters of bulk-fill resin based composites. The strength degradation over time of the materials was also assessed by strength-probability-time (SPT) analysis. Methods Three bulk-fill [Tetric EvoCeram Bulk Fill (TBF); X-tra fil (XTR); Filtek Bulk-fill flowable (BFL)] and a conventional one [Filtek Z250 (Z250)] were studied. Seventy five disk-shaped specimens (12 mm in diameter and 1 mm thick) were prepared by inserting the uncured composites in a stainless steel split mold followed by photoactivation (1200 mW/cm2/20 s) and storage in distilled water (37°C/24 h). Degree of conversion was evaluated in five specimens by analysis of FT-IR spectra obtained in the mid-IR region. The SCG parameters n (stress corrosion susceptibility coefficient) and σf0 (scaling parameter) were obtained by testing ten specimens in each of the five stress rates: 10-2, 10-1, 100, 101 and 102 MPa/s using a piston-on-three-balls device. Weibull parameter m (Weibull modulus) and σf0 (characteristic strength) were obtained by testing additional 20 specimens at 1 MPa/s. Strength-probability-time (SPT) diagrams were constructed by merging SCG and Weibull parameters. Results BFL and TBF presented higher n values, respectively (40.1 and 25.5). Z250 showed the highest (157.02 MPa) and TBF the lowest (110.90 MPa) σf0 value. Weibull analysis showed m (Weibull modulus) of 9.7, 8.6, 9.7 and 8.9 for TBF, BFL, XTR and Z250, respectively. SPT diagram for 5% probability of failure showed strength decrease of 18% for BFL, 25% for TBF, 32% for XTR and 36% for Z250, respectively, after 5 years as compared to 1 year. Significance The reliability and decadence of strength over time for bulk-fill resin composites studied are, at least, comparable to conventional composites. BFL shows the highest fatigue resistance under all simulations followed by TBF, while XTR was at par with Z250.
KW - Dynamic fatigue
KW - Resin composites
KW - Strength degradation
KW - Strength-probability-time diagram
KW - Subcritical crack growth
KW - Weibull analysis
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U2 - 10.1016/j.dental.2015.06.006
DO - 10.1016/j.dental.2015.06.006
M3 - Article
C2 - 26104806
AN - SCOPUS:84938293377
SN - 0109-5641
VL - 31
SP - 1068
EP - 1074
JO - Dental Materials
JF - Dental Materials
IS - 9
M1 - 2577
ER -