The way I've kept pie crust from sticking to the pie plate is to poke holes in the pie crust before baking and before putting the pie crust dough in the pie plate is to spray the pie plate pan with some PAM spray.
The PAM spray along with the holes keeps the pie from sticking to the pie plate for me.
Also when baking pies and to get the best baking results, use a glass or dull-metal pie pan.
Avoid shiny metal or disposable aluminum pans that reflect heat and prevent crusts from browning.
Your pie will come out much better and the pie crust should not stick to the pie plate.
Also don't over stretch the pie dough when fitting it to the pan because that is another cause of pie crust sometimes sticking to the pie plate.