MDS PREP
Activity of disinfectants is
1) Reduced by organic debris or blood
2) Increased with heat
3) Hastened by adding 5 % oxygen
4) Nullified by ethylene dioxide gas
Endodontics
Answer: 1
Activity of disinfectants is indeed reduced by organic debris or blood. This is because organic materials can act as a barrier, protecting microorganisms from the disinfectant and reducing its effectiveness. The presence of organic matter can bind to the disinfectant, inactivate it, or consume it, thereby reducing its ability to kill or inhibit the growth of microorganisms. For this reason, it is essential to thoroughly clean and debride the area before applying a disinfectant to ensure optimal efficacy.
While combining NaOCH and H2O2 as irrigants
1) H2O2 should be used last
2) NaOCH should be used last
3) First irrigation should be done by normal saline
4) NaOCH and H2O2 should never be used simultaneously
Endodontics Answer: 2
Because residual H2O2 might react with debris and produce gas that can cause continuous pain.
Which of the following can be used as root canal filling materials
1) Cements and plastic materials
2) GP points
3) Silver points
4) All of the above
Endodontics
Answer: 4
Identify the wrong statement about obturation
1. Silver cones are recommended in fine tortuous canals
2. Compaction McSpadden utilises 6000-10,000 rpm
3. Silver cones are recommended for canals in which post is placed
4. All of the above are correct
Endodontics
Answer: 3
Apicoectomy is contraindicated in
1. Extensive bone loss
2. Overfilled root canals
3. Lateral perforation at apical third
4. Is not contraindicated
Endodontics
Answer: 1
Best method of condensation
1. Lateral condensation
2. Thermoplasticized
3. Vertical condensation
4. None of the above
Endodontics
Answer: 1
After treatment of a non-vital tooth with a sinus, the sinus
1. Should be filled with gutta-percha
2. Cauterised electrosurgically
3. Heals by itself, no treatment
4. Cauterised chemically