OBJECTIVES: The objective was to determine the fracture and cyclic fatigue properties of composite-dentin beams bonded with a self-etching adhesive in four-point bend. METHODS: Beams of rectangular cross-section were shaped to a size of approximately 0.87mmx0.87mmx10mm and placed in a four-point bending apparatus, with the loading points 1.8 and 7.2mm apart, with the interface centered between the inner rollers. Cyclical loading was performed in Hanks' Balanced Salt Solution at 25 degrees C, with forces between 54% and 99% of the bending strength of the bonded beams. RESULTS: Solid dentin and solid composite beams [n=6] had bending strengths of 164.4 and 164.6MPa, respectively, under monotonically increasing loads. Bonded beams [n=6] had strengths of 90.6MPa. No significant difference was found between solid composite and solid dentin beams, the bonded beams were different (ANOVA, p<0.0001) With long-term cycling, stresses below 49MPa were tolerated for 10(6) cycles, but with increasing stress up to 90MPa, beams failed earlier, demonstrating that subcritical fatigue cycling will eventually cause failure. SIGNIFICANCE: Fatigue may be a significant mechanism of dentin-composite bond degradation.
OBJECTIVES: The objective was to determine the fracture and cyclic fatigue properties of composite-dentin beams bonded with a self-etching adhesive in four-point bend. METHODS: Beams of rectangular cross-section were shaped to a size of approximately 0.87mmx0.87mmx10mm and placed in a four-point bending apparatus, with the loading points 1.8 and 7.2mm apart, with the interface centered between the inner rollers. Cyclical loading was performed in Hanks' Balanced Salt Solution at 25 degrees C, with forces between 54% and 99% of the bending strength of the bonded beams. RESULTS: Solid dentin and solid composite beams [n=6] had bending strengths of 164.4 and 164.6MPa, respectively, under monotonically increasing loads. Bonded beams [n=6] had strengths of 90.6MPa. No significant difference was found between solid composite and solid dentin beams, the bonded beams were different (ANOVA, p<0.0001) With long-term cycling, stresses below 49MPa were tolerated for 10(6) cycles, but with increasing stress up to 90MPa, beams failed earlier, demonstrating that subcritical fatigue cycling will eventually cause failure. SIGNIFICANCE: Fatigue may be a significant mechanism of dentin-composite bond degradation.
Authors: J De Munck; B Van Meerbeek; Y Yoshida; S Inoue; M Vargas; K Suzuki; P Lambrechts; G Vanherle Journal: J Dent Res Date: 2003-02 Impact factor: 6.116
Authors: Luis A Litonjua; Sebastiano Andreana; Peter J Bush; Thomas S Tobias; Robert E Cohen Journal: J Am Dent Assoc Date: 2003-07 Impact factor: 3.634
Authors: Mustafa Murat Mutluay; Ke Zhang; Heonjune Ryou; Mobin Yahyazadehfar; Hessam Majd; Hockin H K Xu; Dwayne Arola Journal: J Mech Behav Biomed Mater Date: 2012-11-17
Authors: Paulette Spencer; Qiang Ye; Jonggu Park; Elizabeth M Topp; Anil Misra; Orestes Marangos; Yong Wang; Brenda S Bohaty; Viraj Singh; Fabio Sene; John Eslick; Kyle Camarda; J Lawrence Katz Journal: Ann Biomed Eng Date: 2010-02-27 Impact factor: 3.934
Authors: Zihou Zhang; Dylan Beitzel; Mustafa Mutluay; Franklin R Tay; David H Pashley; Dwayne Arola Journal: Dent Mater Date: 2015-07-10 Impact factor: 5.304
Authors: Zihou Zhang; Dylan Beitzel; Hessam Majd; Mustafa Mutluay; Arzu Tezvergil-Mutluay; Franklin R Tay; David H Pashley; Dwayne Arola Journal: Dent Mater Date: 2015-12-29 Impact factor: 5.304