A 65 year old edentulous patient is treated for squamous cell carcinoma involving 2/3rd of tongue with 50 Gy radiation dose. Which of the following material is best for making impression in this patient?

The patient has undergone radiation therapy, which leads to xerostomia. Therefore, in this patient, hydrophilic impression material cannot be used. ZOE impression material is also contraindicated in this patient, since it can adhere to mucosa and leads to ulceration on removal. So, among the options provided, only polysulfide is the best suitable impression material for these kind of patients.