The purpose of this study is to evaluate the quality of the tooth-composite interface. Material and Method: Composition-based zirconia-silica commercially available as Valux Plus TM was used as repair material for a permanent premolar cavity dimensions of 4 mm long, 3 mm wide and 2 mm deep. After restoration was extracted premolar orthodontic reasons, and prepared a cross section containing the interface between composite and natural tissue being examined by SEM microscopy and FTIR spectroscopy. Results and discussion: Restoring anorganic is loaded with 71% by volume of zirconium-silica particle sizes between 3.5-0.01 microns. 10% silica content of Zn-Si composite were broadcast in the natural tissue, with good adhesion to biocomposite the natural tissue. Conclusions: Restoration of Zn-Si is successfully used to restore premolar, as demonstrated by FTIR spectroscopy and SEM microscopy.
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