zero-degree teeth: posterior denture teeth having 0-degree cuspal angles in relation to the plane established by the horizontal occlusal surface of the tooth— called also zero-degree nonanatomic teeth—see NONANATOMIC TEETH
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
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