TY - JOUR
T1 - On the interfacial fracture resistance of resin-bonded zirconia and glass-infiltrated graded zirconia
AU - Chai, Herzl
AU - Kaizer, Marina
AU - Chughtai, Asima
AU - Tong, Hui
AU - Tanaka, Carina
AU - Zhang, Yu
N1 - Funding Information:
This work was sponsored by funding from the United States National Institute of Dental & Craniofacial Research , National Institutes of Health (P.I. Y. Zhang, Grant 2R01 DE017925 ) and the Israeli Science Foundation (P.I. H. Chai, ISF Grant no. 810/09 ).
Publisher Copyright:
© 2015 Academy of Dental Materials.
PY - 2015/11
Y1 - 2015/11
N2 - Objective A major limiting factor for the widespread use of zirconia in prosthetic dentistry is its poor resin-cement bonding capabilities. We show that this deficiency can be overcome by infiltrating the zirconia cementation surface with glass. Current methods for assessing the fracture resistance of resin-ceramic bonds are marred by uneven stress distribution at the interface, which may result in erroneous interfacial fracture resistance values. We have applied a wedge-loaded double-cantilever-beam testing approach to accurately measure the interfacial fracture resistance of adhesively bonded zirconia-based restorative materials. Methods The interfacial fracture energy GC was determined for adhesively bonded zirconia, graded zirconia and feldspathic ceramic bars. The bonding surfaces were subjected to sandblasting or acid etching treatments. Baseline GC was measured for bonded specimens subjected to 7 days hydration at 37°C. Long-term GC was determined for specimens exposed to 20,000 thermal cycles between 5 and 55°C followed by 2-month aging at 37°C in water. The test data were interpreted with the aid of a 2D finite element fracture analysis. ResultsThe baseline and long-term GC for graded zirconia was 2-3 and 8 times greater than that for zirconia, respectively. More significantly, both the baseline and long-term GC of graded zirconia were similar to those for feldspathic ceramic. SignificanceThe interfacial fracture energy of feldspathic ceramic and graded zirconia was controlled by the fracture energy of the resin cement while that of zirconia by the interface. GC for the graded zirconia was as large as for feldspathic ceramic, making it an attractive material for use in dentistry.
AB - Objective A major limiting factor for the widespread use of zirconia in prosthetic dentistry is its poor resin-cement bonding capabilities. We show that this deficiency can be overcome by infiltrating the zirconia cementation surface with glass. Current methods for assessing the fracture resistance of resin-ceramic bonds are marred by uneven stress distribution at the interface, which may result in erroneous interfacial fracture resistance values. We have applied a wedge-loaded double-cantilever-beam testing approach to accurately measure the interfacial fracture resistance of adhesively bonded zirconia-based restorative materials. Methods The interfacial fracture energy GC was determined for adhesively bonded zirconia, graded zirconia and feldspathic ceramic bars. The bonding surfaces were subjected to sandblasting or acid etching treatments. Baseline GC was measured for bonded specimens subjected to 7 days hydration at 37°C. Long-term GC was determined for specimens exposed to 20,000 thermal cycles between 5 and 55°C followed by 2-month aging at 37°C in water. The test data were interpreted with the aid of a 2D finite element fracture analysis. ResultsThe baseline and long-term GC for graded zirconia was 2-3 and 8 times greater than that for zirconia, respectively. More significantly, both the baseline and long-term GC of graded zirconia were similar to those for feldspathic ceramic. SignificanceThe interfacial fracture energy of feldspathic ceramic and graded zirconia was controlled by the fracture energy of the resin cement while that of zirconia by the interface. GC for the graded zirconia was as large as for feldspathic ceramic, making it an attractive material for use in dentistry.
KW - Cement bond
KW - Feldspathic ceramic
KW - Glass-infiltrated graded zirconia
KW - Interfacial fracture energy
KW - Wedge-loaded double-cantilever-beam
KW - Zirconia
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U2 - 10.1016/j.dental.2015.08.161
DO - 10.1016/j.dental.2015.08.161
M3 - Article
C2 - 26365987
AN - SCOPUS:84945434903
SN - 0109-5641
VL - 31
SP - 1304
EP - 1311
JO - Dental Materials
JF - Dental Materials
IS - 11
ER -