Temporary obturator is constructed from pri-surgical impression cast:
a. Interim Obturator
b. Definitive obturator c. Surgical obturator d. All of the above

Not an extra oral maxillofacial appliances
a. Nasal prosthesis
b. Auricular prosthesis c. Radiation stent d. Carrier Stent E. None

As a result of aging, the mandibular residual ridge:
A. Becomes wider posteriorly
B. Becomes narrower posteriorly C. Has no change in the posterior region D. None of the above E. All of the above

The ultimate goal of research of RRR is:
a. control of the disease
b. prevention of the disease c. maintenance of oral health d. All of them