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Microtensile Bond Strength Compared Between CAD/CAM Feldspathic and Resin Nano Ceramics

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Technical Report

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Uniformed Services University of the Health Sciences FORT BRAGG United States

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Objectives To investigate the microtensile bond strength TBS and failure mode of resin cement bonded to feldspathic and resin nano ceramic CADCAM crowns. Methods Feldspathic and nano resin ceramic blocks, which are designed for the CEREC CADCAM system Sirona, Charlotte, NC, are to be used for the study. Four CEREC Vitablocs Mark II fine-particle feldspar ceramic blocks I14, size 12x14x18 mm3, Vita, Bad Sackingen, Germany, and four 3M Lava Ultimate resin nano ceramic size14L 3M ESPE Saint Paul, MN were used. Block surfaces were treated with hydrofluoric acid or air abrasion before application of a layer of Nexus 3 resin cement. Z100 composite was then incrementally cured to the cement in 2 mm increments to a thickness of 5 mm. Blocks were cut creating 50-60, 1 mm2 slabs. The slabs were stored in distilled water at 37C for 24 hours. 12 slabs were chosen at random from each block. Tensile stress was applied to slabs with an Instron Universal machine until failure. 30X light microscope was used to confirm adhesive failure, and the force was recorded in Mpa. The measured MPa were then compared statistically with a Two-Factor ANOVA and Tukey test. Results Microtensile strength was not statistically different within the blocks A-D for both groups. There was a significantly different between Vitablocs Mark II and Lava Ultimate with 18.5Mpa -3.7 and 47.6MPa 12.2- respectively. Conclusion Within the limitations of this study, Lava Ultimate has a significantly higher bond strength compared to Vitablocs Mark II.

Subject Categories:

  • Adhesives, Seals and Binders
  • Ceramics, Refractories and Glass

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