Prosthodontics – INBDE Complete Questions with
Correct Answers (2025) – Exam Preparation Material
Introduction:
This document provides a complete collection of prosthodontics
questions and answers for the INBDE exam 2025. It covers all key
topics including impression materials, gypsum products, occlusion,
articulators, pontic design, denture techniques, and implant
considerations. Each question is paired with the correct answer,
making it a reliable study resource for dental students preparing for
board examinations.
Exam Questions and Answers:
206. the main chemical constituent of dental laboratory plaster, as
supplied is? --- correct answer --- calcium sulfate hemihydrate
207. all gypsum products are mined as _________? --- correct
answer --- calcium sulfate DIHYDRATE
208. plaster of paris is? --- correct answer --- B- hemihydrate (b-
laster)
209. stone is? --- correct answer --- Alpha- hemihydrate
210. alpha hemihydrate require_________water than B
hemihydrate? --- correct answer --- less
211. cast can be disinfect with diluted NaCl or Iodophor? ---
correct answer --- 1:10
,212. the weakest gypsum product? --- correct answer --- dental
plaster
213. reaction when gypsum product mixed with water, heat is
given off is called? --- correct answer ----exothermic reaction
214. giving up water? --- correct answer --- syneresis
215. gaining water? --- correct answer --- imbibition
216. impression material that is most rigid & most difficult to
remove from the mouth? --- correct answer --- polyether
217. Which is not recommended for final FPD cast impression?
irreversible hydrocolloid
reversible hydrocolloid PVS
Polyether? --- correct answer --- irreversible hydrocolloid
(alginate);most inaccurate
218. _________excellent dimensional stability, truly hydrophilic,
resulting super wettability.? --- correct answer --- polyether
219. polyvinyl siloxane (PVS) impression material set by? ---
correct answer --- chain reaction polymerization
220. why does condensation silicone has poor dimensional
stability? --- correct answer --- due to elimina- tion of alcohol
(ethyl) causing shrinkage of material. pour after 30 mins (stress
relaxation).
221. impression material set by acid-base reaction? --- correct
answer --- ZOE
222. accelerator of ZOE impression material? --- correct answer ---
calcium chloride
,223. component in ZOE impression reduce burning sensation in soft
tissue of the mouth? --- correct answer --- oil of cloves
224. impression material is elastic, sets by physical reaction and
subject to syneresis & imbibition? --- correct answer --- reversible
hydrocolloids (agar)
225. reversible hydrocolloids (agar) is an organic substance
derived from -? --- correct answer --- seaweed
226. Imbibition & syneresis affect which material the most? ---
correct answer --- reversible hydrocolloids (agar)/ irreversible
(alginate)
227. is a special type of diffusion when water is absorbed by
solids-col- loids causing an enormous increase in volume? ---
correct answer --- imbibition
228. main component of alginate powder & function as filler? ---
correct answer --- diatomaceous earth
229. Most stable impression material or provides best dimensional
quality? --- correct answer --- PVS (addition silicone)
230. Condensation silicones release as a byproduct during their
setting reaction.? --- correct answer --- alcohol
231. what is the principal physical property that makes polyether
elastomeric impression materials less desirable than polyvinyl
siloxanes? --- correct answer --- high stittness
232. catalyst of polyvinyl siloxane (PVS)? --- correct answer ---
chloroplatinic acid
233. scavengers of PVS? --- correct answer --- platinum/ palladium
, 234. most widely used and most accurate impression material? ---
correct answer --- addition siloxane (PVS)
235. Impression material that has highest tear strength? --- correct
answer --- polysulfides
236. impression material has greatest wettability? --- correct
answer --- hydrocolloids
237. retarder in alginate? --- correct answer --- sodium phosphate
238. patient is a gagger, which impression should be taken first? ---
correct answer --- mandible should be taken first.
239. heavy bodied elastomeric impression material contains %
filler? --- correct answer --- 60
240. Polysulfide impression material should be poured within ?-
-- correct answer --- 1 hour
241. By product of polysulfide impression material is ?
Water
Ethyl alcohol
No by-product
None of the above --- correct answer --- water
242. powder component of acrylic resin? --- correct answer ---
polymethyl methacrylate (PMMA)
243. Initiator of PMMA? --- correct answer --- benzoyl peroxide
244. chemical activator of self-cured resin? --- correct answer ---
dimethyl-p- toluidine
Correct Answers (2025) – Exam Preparation Material
Introduction:
This document provides a complete collection of prosthodontics
questions and answers for the INBDE exam 2025. It covers all key
topics including impression materials, gypsum products, occlusion,
articulators, pontic design, denture techniques, and implant
considerations. Each question is paired with the correct answer,
making it a reliable study resource for dental students preparing for
board examinations.
Exam Questions and Answers:
206. the main chemical constituent of dental laboratory plaster, as
supplied is? --- correct answer --- calcium sulfate hemihydrate
207. all gypsum products are mined as _________? --- correct
answer --- calcium sulfate DIHYDRATE
208. plaster of paris is? --- correct answer --- B- hemihydrate (b-
laster)
209. stone is? --- correct answer --- Alpha- hemihydrate
210. alpha hemihydrate require_________water than B
hemihydrate? --- correct answer --- less
211. cast can be disinfect with diluted NaCl or Iodophor? ---
correct answer --- 1:10
,212. the weakest gypsum product? --- correct answer --- dental
plaster
213. reaction when gypsum product mixed with water, heat is
given off is called? --- correct answer ----exothermic reaction
214. giving up water? --- correct answer --- syneresis
215. gaining water? --- correct answer --- imbibition
216. impression material that is most rigid & most difficult to
remove from the mouth? --- correct answer --- polyether
217. Which is not recommended for final FPD cast impression?
irreversible hydrocolloid
reversible hydrocolloid PVS
Polyether? --- correct answer --- irreversible hydrocolloid
(alginate);most inaccurate
218. _________excellent dimensional stability, truly hydrophilic,
resulting super wettability.? --- correct answer --- polyether
219. polyvinyl siloxane (PVS) impression material set by? ---
correct answer --- chain reaction polymerization
220. why does condensation silicone has poor dimensional
stability? --- correct answer --- due to elimina- tion of alcohol
(ethyl) causing shrinkage of material. pour after 30 mins (stress
relaxation).
221. impression material set by acid-base reaction? --- correct
answer --- ZOE
222. accelerator of ZOE impression material? --- correct answer ---
calcium chloride
,223. component in ZOE impression reduce burning sensation in soft
tissue of the mouth? --- correct answer --- oil of cloves
224. impression material is elastic, sets by physical reaction and
subject to syneresis & imbibition? --- correct answer --- reversible
hydrocolloids (agar)
225. reversible hydrocolloids (agar) is an organic substance
derived from -? --- correct answer --- seaweed
226. Imbibition & syneresis affect which material the most? ---
correct answer --- reversible hydrocolloids (agar)/ irreversible
(alginate)
227. is a special type of diffusion when water is absorbed by
solids-col- loids causing an enormous increase in volume? ---
correct answer --- imbibition
228. main component of alginate powder & function as filler? ---
correct answer --- diatomaceous earth
229. Most stable impression material or provides best dimensional
quality? --- correct answer --- PVS (addition silicone)
230. Condensation silicones release as a byproduct during their
setting reaction.? --- correct answer --- alcohol
231. what is the principal physical property that makes polyether
elastomeric impression materials less desirable than polyvinyl
siloxanes? --- correct answer --- high stittness
232. catalyst of polyvinyl siloxane (PVS)? --- correct answer ---
chloroplatinic acid
233. scavengers of PVS? --- correct answer --- platinum/ palladium
, 234. most widely used and most accurate impression material? ---
correct answer --- addition siloxane (PVS)
235. Impression material that has highest tear strength? --- correct
answer --- polysulfides
236. impression material has greatest wettability? --- correct
answer --- hydrocolloids
237. retarder in alginate? --- correct answer --- sodium phosphate
238. patient is a gagger, which impression should be taken first? ---
correct answer --- mandible should be taken first.
239. heavy bodied elastomeric impression material contains %
filler? --- correct answer --- 60
240. Polysulfide impression material should be poured within ?-
-- correct answer --- 1 hour
241. By product of polysulfide impression material is ?
Water
Ethyl alcohol
No by-product
None of the above --- correct answer --- water
242. powder component of acrylic resin? --- correct answer ---
polymethyl methacrylate (PMMA)
243. Initiator of PMMA? --- correct answer --- benzoyl peroxide
244. chemical activator of self-cured resin? --- correct answer ---
dimethyl-p- toluidine
