2016 Glossary - 74
enogenic graft n: placement of a tissue obtained from an animal species over, or into,
an affected area of another species. Also
known as a heterologous graft.
xeroradiography n: the dry photoelectric process by
which an X-ray image is captured using metal plates
coated with a semiconductor, such as selenium.
xerostomia n: dryness of the mouth due to lack of or
inadequate secretions (eg, inadequate salivary secretions).
east n: classified in the kingdom Fungi, these
eukaryotic microorganisms are mostly unicellular but can become multicellular through the
formation of pseudohyphae or strings of con-
nected budding cells. Yeast can reproduce by mitosis,
asymmetric division. or budding. Yeast can become
pathogenic in the body, including the oral cavity, espe-
cially in people who are immunocompromised through
disease or drug therapy.
Young's modulus n: describes the rigidity or stiffness
of a material usually given the symbol E. It is a measure of elasticity equal to the ratio of the stress acting on a substance to the strain produced. A higher
modulus (GPa, psi) signifies a greater rigidity or stiffness to the material. Also called modulus of elasticity.
ero-degree teeth n: posterior denture teeth
having flat planes or zero-degree cusp angles
relative to the horizontal occlusal surface of
the tooth. See also nonanatomic teeth.
zirconia ceramic post n: a ceramic post used instead
of metal posts in the restoration of endodontically
treated teeth. The ceramic material is preferred to
the metal posts for esthetic reasons. Ceramic posts
are usually used with a composite resin or compression ceramic to form the core.