No. Don't use. PVC is a different material and latex is a different material. PVC cannot give you the protection from infection during oral sex as PVC is an unstable and porous material. At the surface it might look good and strong enough to provide the much needed protection.
Dental dams made using latex, polyurethane or nitrate provide greater protection for the user.
So, never try to use a PVC glove as a dental dam. If you have seen the instructions written on the pack of PVC gloves, Medical exam quality gloves that are non-sterile, single-use and fit either hand, best for first aid, health and baby care, incontinence and diabetic care, easy on-off, made of pvc, latex and powder free, flexible, light-weight….