Comparison of the indentation strength and single-edge-v-notched beam methods for dental ceramic fracture toughness testing
Domingues, Natália Bertolo; Galvão, Beatriz Regalado; Ribeiro, Sebastião; Almeida Junior, Antonio Alves de; Longhini, Diogo; Adabo, Gelson Luís.
Braz. j. oral sci
; 15(2): 109-112, Apr.-June 2016. tab
Artigo
em Inglês
| LILACS, BBO | ID: biblio-848183
Aim:
To study influence of the cooling rate after sintering a veneering porcelain (Vita VM9) on fracture toughness by indentation strength (IS) and single-edge-v-notched beam (SEVNB) methods.Methods:
Vita VM9 bars were sintered according to the manufacturer's recommendation and cooled under three conditions Slow (inside the furnace from sintering temperature to room temperature); Normal (inside the furnace from sintering temperature to 500 ºC and outside the furnace from 500 ºC to room temperature); and Fast (outside the furnace from sintering temperature to room temperature). Fracture toughness was measured by IS (n=10) and SEVNB (n=10) methods. Data were analyzed by two-way ANOVA (α=0.05).Results:
The fracture toughness obtained from SEVNB (slow - 1.02±0.10; normal - 1.09±0.13; and fast - 1,02±0.18 MPa.m1/2 cooling techniques) was significantly lower than IS (slow - 1.19±0.13; normal - 1.17±0.07; and fast - 1.16±0.06 MPa. m1/2 cooling techniques). There was no significant influence of the cooling technique (p=0.012).Conclusions:
The measurement technique influenced the fracture toughness values . IS method overestimated the fracture toughness values. Irrespective of the measuring method, cooling rate did not influence the Vita VM9 veneering porcelain fracture toughness (Au)
Biblioteca responsável:
BR218.1
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