These changes were highly significant in the cases of titanium dioxide and aluminium oxide, and they were very highly significant for zirconium dioxide, BI and A3.5 shades ( Table 3 ). - Moreover, when gingival thickness reached 3 mm, the only visible change was caused by aluminium oxide.
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Color variation induced by abutments in the superior anterior maxilla: an <i>in vitro</i> study in the pig gingiva.
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