This National Standard of Canada is equivalent to International Standard ISo
9917-1991. It specifies requirements for the following types of dental
cements, including both hand-mixed and capsulated cements for mechanical
mixing, which are intended for permanent cementation, lining and restoration,
and effect setting only by an aqueous acid-base reaction. Silicate cements based on the reaction between an alumino-silicate glass powder
and an aqueous solution of phosphoric acid which may contain metal ions. They
are used for the aesthetic restoration of anterior teeth. Zinc phosphate cements based on the reaction between an oxide powder (the
principal constituent of which is zinc oxide) and an aqueous solution of
phosphoric acid which may contain metal ions. They are used as luting agents
to seal dental appliances to hard oral structures or to other appliances. They
can also be used as a base for restorative materials and as temporary
restorative material by increasing the ratio of powder to liquid relative to
that used for luting. Silicophosphate cements based on the reaction between a powder of acid-soluble
aluminosilicate glass and metal oxides (principally zinc oxide) and an aqueous
solution of phosphoric acid which may contain metal ions. They are used as
temporary restorative materials or as luting agents to seal dental appliances
to hard oral structures by varying the ratio of powder to liquid. Zinc polycarboxylate cements based on the reaction between zinc oxide and
aqueous solutions of polyacrylic acid or similar polycarboxylic compounds, or
zinc oxide/polycarboxylic acid powders which are mixed with water. They are
used as luting agents to seal appliances, or as a base for restorative
materials or as temporary restorative materials. Glass polyalkenoate cements based on the reaction between an aluminosilicate
glass powder and an aqueous solution of an alkenoic acid, or between an
aluminosilicate glass/polyacid powder blend and water, or an aqueous solution
of tartaric acid. These translucent cements are for use for the aesthetic
restoration of teeth, as luting agents, as bases or liners and for restoring
pits and fissures. Glass polyalkenoate cements in which the glass and a metal have been fused
together and which are intended for the restoration of teeth are also included. This standard specifies limits for each of the properties according to whether
the cement is intended for as a luting agent, a restorative material, a base or
a liner.