2. 1 Shift List a major error in the access opening for: 1- Premolar: 2- Molar:

3. 2 Shift 1- What is wrong in this access cavity design? 2- What is the necessary step needed to correct it?

4. 3 Shift ACB Write down the type of Vertucci’s canal configurations for each tooth

5. 4 Shift 1- What is the type of error? 2- Why it is happened?

6. 5 Shift 1. What is the name of the device ? 2. What is the name of the object marked with a RED arrow ?

7. 6 Shift Mention 2 uses of the rubber stopper ?

8. 7 Shift This Photograph shows root canal apical blockage with debris, this can be prevented by: 1- 2-

9. 8 Shift 1- Name of this instrument? 2- How can one knows the size of this instrument?

10. 9 Shift 1- During crown down preparation of mesiobuccal canal of a lower molar what is it used for? 2- On which wall should it be placed when used in mesiobuccal canal?

11. 10 Shift These two photomicrographs are for canal walls before and after removal of the smear layer 1- Mention one reason why do we have to remove the smear layer? 2- How can it be removed?

12. 11 Shift Name of material with red arrow Name of canal with yellow arrow This is an access for which tooth?

13. 12 Shift 1- The name of both objects inside root canal 2- The function of object labeled with an arrow

14. 13 Shift 1- The name of this obturation technique

15. 14 Shift 1- The name of this canal if this radiograph is taken with mesial angulation?

16. 15 Shift 1- What are the possible sizes for this yellow colored file? 2- write down the corresponding diameter for each size? 3- what is the rate of tapering per millimeter?