[ 8 ] showed that the layered porcelain veneering group had higher tetragonal to monoclinic phase transformation than the pressed group, but this difference did not reach statistical significance.
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Shear Bond Strength of Colored and Sandblasted Zirconia to Ceramic Veneers Fabricated by the Pressing and Layering Techniques: An In Vitro Study.
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The sentences
Considering the limitations of this study, further studies with a larger sample size are required to find possibly significant differences.