Effect of cement type on microleakage of cast post-and-core systems under cyclic loading

Autores

  • Leyla Sadighpour
  • Maryam Memarian
  • Zohreh Moradi
  • Niloofar Goudarzi
  • Mohammad J. Kharazi Fard

DOI:

https://doi.org/10.7213/aor.v7i1.23139

Palavras-chave:

Post and core, Microleakage, Cyclic loading, Thermal cycling

Resumo


Objective: The purpose of this study was to compare the microleakage of four cements in cast post-andcoresystems under cyclic loading. Materials and methods: Sixty-four human premolars were sectionedat the cement-enamel junction, endodontically treated, and divided into four groups (n = 16). Cast postsand cores were fabricated for root segments and were cemented with zinc phosphate cement (Harvard),resin-modified glass ionomer (Fuji PLUS), dual-cured phosphate methacrylate resin cement (Panavia F),or a dual-cured resin cement (Variolink II). All specimens underwent thermal cycling for 1.500 cycleswith 5 °C and 55 °C, with a dwelling time of 12 seconds. Half of the specimens of each group were subjectedto cycling loading with 50 N at 1.2 Hz for 750,000 cycles. Specimens were then immersed in 5%basic fuchsin solution for 24 hours. Specimens were sectioned, visualized by stereomicroscope under40x magnification and scored for dye penetration. The ratio between the length of the interface and thelength of dye penetration was also determined. Microleakage differences between the four cements were analyzed by Kruskal-Wallis test, and the effect of fatigue was analyzed with Mann-Whitney nonparametrictest (α =.05). Results: No failures occurred during fatigue testing. The zinc phosphate cement showedsignificantly higher microleakage values compared to other cements under both unloaded and loadedconditions (p = .007 and p = .006). Fatigue significantly increased the microleakage in all groups (p < .05).Conclusions: The microleakage values for the resin cements and the resin-modified glass ionomer weresimilar and significantly less than those of zinc phosphate, irrespective of loading. Fatigue loading increasedthe microleakage values for all the cements.

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Publicado

2011-11-28

Como Citar

Sadighpour, L., Memarian, M., Moradi, Z., Goudarzi, N., & Fard, M. J. K. (2011). Effect of cement type on microleakage of cast post-and-core systems under cyclic loading. Archives of Oral Research, 7(1). https://doi.org/10.7213/aor.v7i1.23139

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