How would a dentist use thermal expansion to him or her decide on which material to use when he or she is filling a tooth? what kind of material might be best for the filling?

A dentist uses thermal expansion in the filling of a material to a tooth since any material when exposed to heat expands in a certain degree depeding on the material. in this case, it is best that the material used for filling is more or less a ceramic one in which heat expansion is not that great to disturb the configuration of the teeth

Its strengthits conductivity of heat and electricity its shiny colourmalleable and ductility

Where is the following?