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

Yes i think so not 100 percent sure though

Less stable  hope this