Influence of pH on slow crack growth of dental porcelains

Pinto, Marcos Franke; César, Paulo Francisco; Rosa, Vinícius; Yoshimura, Humberto Naoyuki

doi:10.1016/j.dental.2007.10.001

Cited by 50 publications

(46 citation statements)

References 27 publications

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“…In addition, previous studies have reported that the size of the leucite particles in feldspathic-based ceramics increased during heat treatment within the normal ceramic firing range 31,32) , thereby further increasing the probability of microcracking 33,34) . On the effect of pH of storage media on slow crack growth of dental porcelains, Pinto et al 35) concluded that leucite-based ceramic (as opposed to ceramic without leucite particles) was more susceptible to slow crack growth in acidic conditions compared to base and neutral conditions. This could thus explain why immersion in acidic agents had deleterious effects on IPS d.SIGN fluorapatite-leucite ceramic.…”

Section: Discussionmentioning

confidence: 99%

Degradability of fluorapatite-leucite ceramics in naturally acidic agents

2010

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This study was conducted to evaluate the titratable acidity and effect of naturally acidic agents on the surface microhardness, elemental composition, and surface morphology of fluorapatite-leucite ceramics. One hundred and ten ceramic disks (IPS d.SIGN), 12.0 mm in diameter and 2.0 mm in thickness, were fabricated. Before immersion, the baseline data of Vickers microhardness and elemental composition were recorded. Four groups were immersed in acidic agents (citrate buffer solution, green mango juice, and pineapple juice) and deionized water (control) at 37ºC for 168 hours, whereas one group was immersed in 4% acetic acid at 80ºC for 168 hours. After immersion, specimens were evaluated and data were analyzed using one-way repeated ANOVA and Tukey's test (α=0.05). Microhardness values significantly decreased after immersion (p<0.05). In terms of elemental composition, the weight percentages of silicon, potassium, aluminum, and sodium also decreased after immersion (p<0.05). Results of this study showed that fluorapatite-leucite ceramics were affected by long-term immersion in acidic agents.

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Section: Discussionmentioning

confidence: 99%

Degradability of fluorapatite-leucite ceramics in naturally acidic agents

2010

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“…Shorter storage in acid pH did not cause surface changes [4], but after 7 days of acid immersion, surface deterioration could be observed [1,2], with numerous porosities and small cracks covering the feldspathic ceramic surface [2]. This surface alteration could reduce the ceramic's flexural strength, although the crack growth rates of existing flaws were similar over time, regardless of the salivary pH [3]. Furthermore, the hardness of feldspathic ceramic could decrease with an increase in the pH [3], but this might not be responsible for the decrease in flexural strength, since storage in basic and neutral pH showed no influence on the present data.…”

Section: Discussionmentioning

confidence: 99%

“…Although ceramics are considered to be the most inert of all dental materials used for restorations [1], in reality, some ceramics are not chemically inert, even in a neutral aqueous environment [2], and storage in acid or basic pH can result in degradation of their flexural strength [1,3].…”

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confidence: 99%

May the flexural strength of ceramics be influenced by salivary pH?

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Macedo

Camillo

et al. 2013

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May the flexural strength of ceramics be influenced by salivary pH?RESUMO Objetivo: O objetivo do estudo foi comparar a resistên-cia à flexão três pontos de uma cerâmica feldspática após armazenagem em saliva artificial, durante 30 dias com diferentes regimes de pH: pH ácido (3,5), pH neutro (7,0), pH básico (10) e alternando entre pH ácido/bási-co durante 15 dias cada. Material e Métodos: As barras foram cimentados com cimento resinoso e submetidas a armazenagem em saliva artificial com os diferentes valores de pH. Resultados: Os valores de resistência à flexão foram significativamente maiores para as barras armazenadas em água destilada, em pH neutro e em básico, quando comparadas com os resultados para as barras armazenadas em pH ácido e em meio ácido/bási-co. Conclusões: A armazenamento durante 30 dias em saliva artificial, com pH ácido, ou alternando entre pH ácido e basico, pode reduzir as propriedades mecânicas das cerâmicas.A resistência à flexão de cerâmicas pode ser influenciada pelo pH salivar? ABSTRACTObjective: This study purpose was to compare the three-point flexural strength of feldspathic ceramic after storage in artificial saliva for 30 days with different pH regimens, as acidic pH (3.5), neutral pH (7.0), basic pH (10) and alternating between acid/ basic pH, for 15 days each. Material and Methods: The bars were luted with resin cement and subjected to storage in artificial saliva of different pH values. Results:The values of flexural strength were significantly higher for bars stored in distilled water, at neutral and basic pH, when compared with the results for bars stored in acidic pH and in acid/basic pH. Conclusions: Storage for 30 days in artificial saliva at acidic pH, or alternating between acidic and basic pH, can reduce the mechanical properties of ceramics.

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“…Dez corpos-de-prova de cada grupo foram testados para cada taxa de tensão (Pinto et al, 2008;Rosa et al, 2009). Com exceção da taxa de 1 MPa/s, em que 30 barras foram ensaiadas para realizar a análise estatística de…”

Section: Análise De Weibull E Comportamento De Crescimento Subcríticounclassified

“…A literatura apresenta valores de n variando de 15 a 41 para porcelanas (Morena et al, 1986;Fairhurst et al, 1993;Pinto et al, 2008;Gonzaga et al, 2009;Rosa et al, 2009). Esses valores são semelhantes aos valores obtidos para vidros de silicato (15 a 19), que estão entre os materiais cerâmicos mais susceptíveis ao SCG (Ritter, 1978;Gupta;Jubb, 1981).…”

Section: Comportamento De Crescimento Subcrítico De Trincas -Scgunclassified

Comportamento mecânico de cerâmicas utilizadas na confecção de próteses parciais fixas

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Influence of pH on slow crack growth of dental porcelains

Cited by 50 publications

References 27 publications

Degradability of fluorapatite-leucite ceramics in naturally acidic agents

Degradability of fluorapatite-leucite ceramics in naturally acidic agents

May the flexural strength of ceramics be influenced by salivary pH?

Comportamento mecânico de cerâmicas utilizadas na confecção de próteses parciais fixas

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