zinc oxide eugenol cement: a cement or luting agent resulting from mixing zinc oxide with eugenol (oil of cloves), typically dispensed in the form of a powder and liquid or sometimes two pastes. ANSI/ADA Type I or Type II zinc oxide and eugenol cements are respectively designated for provisional or permanent cementation of restorations fabricated outside of the mouth—see EBA CEMENT

zinc phosphate cement: a cement or luting agent resulting from mixing zinc oxide (powder component) with phosphoric acid, water, aluminum phosphate and zinc phosphate (liquid component). Magnesium oxide is often used as the principal modifier

zinc polycarboxylate cement: a cement or luting agent resulting from mixing zinc oxide, magnesium oxide and sometimes stannous oxide (powder component) with an aqueous solution of polyacrylic acid and copolymers

zirconia ceramic post: a ceramic post used in the restoration of endodontically treated teeth, especially when a metal post may compromise esthetics. Typically used with composite resin or compression ceramics to form the core

zygoma : the area formed by the union of the zygomatic bone with the zygomatic processes of the temporal and maxillary bones