Influence of cross-head speed on resin-dentin shear bond strength

A. T. Hara, L. A.F. Pimenta, A. L. Rodrigues

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Abstract

Objective: To evaluate the influence of different cross-head speeds on shear bond strength test on the dentin surface. Methods: One hundred and twenty extracted bovine incisors were embedded in polystyrene resin. The specimens were prepared by wet grinding with 320-, 400- and 600-grit Al2O3 paper exposing dentin. After the application of the adhesive system Single Bond (3M) to etched dentin, the composite resin Z-100 (3M) was applied and light cured. The specimens were randomly assigned to four groups (n = 30). The shear bond strength tests were performed with an EMIC DL 500 universal testing machine at four different cross-head speeds: 0.50 (A); 0.75 (B); 1.00 (C); and 5.00 mm/min (D). Results: The mean values of shear bond strength in MPa (SD) were: A, 11.78 (3.91); B, 11.82 (4.78); C, 16.32 (6.45); D, 15.46 (5.94). The data were analyzed with one-way ANOVA and Tukey's test (α = 0.05). The results indicated that A = B < C = D. The fracture pattern was evaluated by visual analysis in a stereomicroscope (25 X). The percentage of fractures that occurred at the adhesive interface were: A, 92.5%; B, 91.6%; C, 70.0%; D, 47.0%. The Student's t-test to percentages (α = 0.05) indicated that there were no significant differences among A, B and C; A and B differed from D, and there was no significant difference between C and D. Significance: Different cross-head speeds may influence the shear bond strength and the fracture pattern in dentin substrate. Shear bond strength using cross-head speeds of 0.50 and 0.75 mm/min should be preferred.

Original languageEnglish (US)
Pages (from-to)165-169
Number of pages5
JournalDental Materials
Volume17
Issue number2
DOIs
StatePublished - Mar 1 2001

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Keywords

  • Adhesion
  • Cross-head speed
  • Shear bond strength

ASJC Scopus subject areas

  • Materials Science(all)
  • Dentistry(all)
  • Mechanics of Materials

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