Why Do I Hear Loud Screeching Noises When I Chew With My New Porcelain Veneers?

There is an occlusal problem. You should have your entire bite checked for proper occlusion (the way the upper and lower teeth meet each other in biting and function, as well as in your sleep). Not all dentists are skilled in this.

You do not chew with your front teeth so I am not sure that is what is causing the noises you are hearing.  You may have another issue.  If you have been back to the dentist and he is still unable to determine the problem then I would advise you to seek another opinion. 

Screeching noises when chewing with porcelain veneers is most probably due to interference with occlusion (bite) when moving in excursive movements which occur during chewing. It is also very possible that the lingual (inside) and occlusal (top) surfaces are not well polished which allows the veneers to make a scratching noise which does not occur with a high polish or glaze.

Your bite is off somewhere causing a heavy slide across the porcelain surface creating the unpleasant sound.  The dentist should be able to resolve this for you and should not take hours of adjusting.

 

You 'll need a bite adjustment while you chew. so go to the dentist and ask him to place a cotton on the opposite side, and a bite check paper ( articulating paper ) on the side you have the crown. He/she will find the premature hit and adjust it for you. closing up and down does not cut it.....

Since we chew in an elliptical pattern, it can be challenging to get the bite "perfect".  If there is an area that hits first, a prematurity, then a screeching noise can be heard.  It may take another visit, or a visit to another dentist more experienced in bite issues.

 

However, bite issues are common with crowns in the posterior and not veneers.  We don't chew with our front teeth.  You may have issues with something OTHER than the veneers.