Week 6: Restoration of a root filled tooth

Question 1

1. What is the primary function of a post in the restoration of a root-filled tooth?

A) To strengthen the root
B) To retain the core
C) To provide structural support for the crown
D) To prevent reinfection of the root canal

Answer 1

B

Question 2

2. When preparing a post channel, what is the recommended minimum length of root filling material that should be left intact to avoid disturbing the apical seal?

A) 1-2 mm
B) 4-5 mm
C) 6-7 mm
D) 3 mm

Answer 2

B

Question 3

3. In the restoration of endodontically treated teeth, which of the following is not a function of the restoration?

A) Protection of remaining tooth tissue
B) Restoration of aesthetics
C) Strengthening of the tooth root
D) Prevention of reinfection

Answer 3

C

Question 4

4. Which material is typically used for the final composite layer when restoring a maxillary first molar?

A) CeramX
B) SDR (Smart Dentin Replacement)
C) Resin-modified glass ionomer
D) Zinc oxide eugenol

Answer 4

A

Question 5

5. What is the minimum height of remaining healthy tooth tissue required for the ferrule effect?

A) 1 mm
B) 2 mm
C) 3 mm
D) 5 mm

Answer 5

B

Question 6

6. What is a key consideration when assessing the restorability of a root-filled tooth?

A) The shade of the tooth
B) The quantity of remaining healthy tooth tissue
C) The occlusion only
D) The age of the patient

Answer 6

B

Question 7

7. Which of the following is an important step when placing a composite core on a maxillary first molar?

A) No need for a matrix band
B) Directly filling the pulp chamber with composite
C) Placing a SDR layer to seal enamel, dentine, and the pulp chamber
D) Using amalgam for core build-up

Answer 7

C

Question 8

8. In a post-crowned posterior tooth, what is the recommended occlusal contact guidance?

A) Anterior and posterior teeth should both provide guidance
B) Only posterior teeth should provide guidance
C) Only anterior teeth should provide guidance
D) Post-crowned posterior teeth should have ICP contact only

Answer 8

D

Question 9

9. Which of the following is a key step in the procedure for composite core placement?

A) No need to assess the MOD cavity
B) Remove all existing restorations before proceeding
C) Directly place a resin core without any preparation
D) Leave the buccal cusps unmodified

Answer 9

B

Question 10

10. Which post material is designed to be passive in the root canal space?

A) Parallel-sided post
B) Tapered post
C) Custom-made metal post
D) Glass ionomer post

Answer 10

B

Question 11

What is the primary function of a post in root-filled teeth?
A. Strengthen the root
B. Replace the ferrule
C. Retain the core
D. Improve aesthetics

Answer 11

c

Question 12

Which post type is commonly used in the LDI setting for lab practice?
A. Custom-cast post
B. Fiber-reinforced tapered post
C. Screw post
D. Parallel-sided ParaPost

Answer 12

D

Question 13

What is the minimum amount of gutta-percha that should remain apically after post space preparation?
A. 2 mm
B. 3 mm
C. 4 mm
D. 6 mm

Answer 13

C

Question 14

What is SDR primarily used for in composite core build-up?
A. Final occlusal surface restoration
B. Replace enamel
C. Replace dentine and seal pulp chamber
D. Bond to metal posts

Answer 14

C

Question 15

What is the minimum height of sound coronal tooth tissue required to achieve a ferrule effect?
A. 0.5 mm
B. 1.0 mm
C. 1.5 mm
D. 3.0 mm

Answer 15

C

Question 16

Which material is used for the final composite layer in the UR6 MODB restoration?
A. Flowable composite
B. GIC
C. SDR
D. CeramX

Answer 16

D

Question 17

Which of the following is NOT a function of restoring a root-filled tooth?
A. Reinfection prevention
B. Strengthening the root
C. Structural protection
D. Aesthetic improvement

Answer 17

B

Question 18

Which of these best describes the ideal shape of a post for passive fit?
A. Tapered to match canal
B. Screw-shaped
C. Custom-cast metal
D. Ball-ended

Answer 18

A

Question 19

At what stage should restorability be assessed in endodontic treatment planning?
A. After obturation
B. During post space preparation
C. After placing a temporary restoration
D. Before starting endodontic treatment

Answer 19

D

Question 20

What should be used to prime and bond during composite core placement?
A. EDTA
B. Sodium hypochlorite
C. Active bonding agent
D. Varnish

Answer 20

C

Question 21

What is the primary reason to remove existing restorations when assessing a tooth for post-endodontic restoration?
A. Access canal system
B. Check occlusion
C. Evaluate remaining tooth structure
D. Take a radiograph

Answer 21

C

Question 22

What does “MODB” refer to in the context of cavity classification?
A. Mesial-occlusal-distal-buccal
B. Mesial-oral-dentine-buccal
C. Middle occlusal distal bite
D. Modified occlusion design base

Answer 22

A

Question 23

Which cusp is typically rebuilt with CeramX in a UR6 MODB restoration?
A. DP
B. MB
C. LP
D. DL

Answer 23

B

Question 24

Which step comes directly after placing a matrix band in the core build-up process?
A. Carve occlusion
B. Place SDR
C. Polish
D. Check occlusion

Answer 24

B

Question 25

Why should we avoid sacrificing more dentine during post placement? A. Increases fracture resistance B. Dentine is aesthetic C. Prevents pulp exposure D. No benefit in post retention

Answer 25

A

Question 26

Which factor is NOT considered in coronal tissue assessment? A. Colour of pulp chamber B. Thickness of remaining tooth C. Location of healthy tissue D. Height of remaining tissue

Answer 26

A

Question 27

Which part of the composite restoration helps replace dentine? A. Enamel seal B. CeramX layer C. SDR bulk fill D. Varnish

Answer 27

C

Question 28

Which statement is TRUE regarding post-crowned posterior teeth? A. Provide canine guidance B. Should not have any occlusal contact C. Should have only ICP contact D. Share incisal guidance

Answer 28

C

Question 29

Which type of restoration is generally indicated for root-filled posterior teeth missing one or more proximal walls? A. Veneer B. Inlay C. Full crown without cuspal coverage D. Cuspal coverage restoration

Answer 29

D

Question 30

What is the final step after finishing the UR6 MOD composite core build-up? A. Etch the enamel B. Place ParaPost C. Take a final radiograph and complete CAFS D. Remove gutta-percha

Answer 30

C

Question 31

Which of the following is a purpose of the ferrule effect? A. Improve aesthetics B. Distribute functional forces C. Increase crown height D. Provide occlusal contacts

Answer 31

B

Question 32

Which drill is used in lab sessions for preparing the post channel? A. Gates-Glidden B. Endo-Z C. ParaPost drill D. Round bur

Answer 32

C

Question 33

What is the purpose of using a matrix band during composite core build-up? A. Remove smear layer B. Retain gutta-percha C. Form cavity walls D. Check occlusion

Answer 33

C

Question 34

What is a key consideration in occlusal analysis before restoring a root-filled tooth? A. Whether there’s gingival recession B. Whether the tooth contributes to guidance C. Whether the tooth has amalgam fillings D. Whether it is a maxillary tooth

Answer 34

b

Question 35

Which part of the restoration process comes after placing the matrix band in composite core build-up? A. Place SDR layer B. Polish occlusal surface C. Etch enamel D. Apply rubber dam

Answer 35

a

Question 36

What is the ideal post length in relation to the clinical crown? A. Shorter than crown B. Equal to or longer than crown C. Same as canal curvature D. Only in the coronal third

Answer 36

b

Question 37

What is the purpose of reducing buccal cusps by 2mm during MODB core placement? A. Prevent premature contacts B. Allow access for polishing C. Create space for cuspal coverage D. Avoid interference with dam clamp

Answer 37

c

Question 38

Which material replaces dentine and seals the pulp chamber? A. CeramX B. SDR C. Flowable GIC D. Calcium hydroxide

Answer 38

b

Question 39

What does a ferrule effect help achieve? A. Resistance to fracture B. Occlusal stability C. Pulpal vitality D. Prevent discolouration

Answer 39

A

Question 40

What is used to actively bond the composite to the cavity walls? A. Zinc phosphate B. Polycarboxylate C. Adhesive bonding agent D. Dycal

Answer 40

C

Question 41

What should be left intact during post space preparation? A. Temporary restoration B. Apical gutta-percha seal C. Existing filling D. Matrix band

Answer 41

B

Question 42

What is the function of the post in root-filled teeth? A. Reinforce dentine B. Retain the core C. Guide occlusion D. Replace enamel

Answer 42

B

Question 43

Which wall(s) are built up with SDR before final composite layering? A. Buccal and palatal B. Lingual only C. Mesial and distal D. Occlusal and gingival

Answer 43

C

Question 44

Which is the final material used for onlaying the buccal cusps in a UR6 MODB restoration? A. Flowable composite B. IRM C. CeramX D. MTA

Answer 44

C

Question 45

Which type of post shape is ideal for a passive fit into the root canal? A. Flared B. Threaded C. Tapered D. Beveled

Answer 45

C

Question 46

What is a core build-up primarily intended to do? A. Whiten the tooth B. Provide a foundation for the crown C. Reduce tooth mobility D. Replace the PDL

Answer 46

B

Question 47

Which step should be performed FIRST in a UR6 MODB restoration? A. Apply bonding agent B. Etch enamel C. Reduce buccal cusps D. Place SDR

Answer 47

C

Question 48

Why is it important to take a final radiograph after restoration is complete? A. Verify occlusal scheme B. Assess core build-up and post position C. Measure periodontal ligament space D. Check shade matching

Answer 48

B

Question 49

What is the recommended minimum height of remaining coronal tooth tissue to achieve ferrule effect? A. 0.5 mm B. 1.0 mm C. 1.5 mm D. 3.0 mm

Answer 49

C

Question 50

In a properly placed ParaPost, how much gutta-percha should remain apically? A. 1 mm B. 2 mm C. 4–5 mm D. 6–7 mm

Answer 50

C

Question 51

Which tooth is the focus in the Week 6 composite core lab session? A. UL6 B. UR6 C. LL6 D. LR7

Answer 51

B

Question 52

What happens if too much dentine is sacrificed during post placement? A. Tooth becomes more flexible B. Crown fit improves C. Risk of fracture increases D. Bond strength improves

Answer 52

c

Question 53

Which material is NOT used in the UR6 composite core build-up? A. SDR B. CeramX C. ZOE D. Bonding agent

Answer 53

c

Question 54

What does the CeramX layer primarily provide in the restoration? A. Pulp protection B. Final occlusal form and strength C. Bacterial seal D. Radiopacity

Answer 54

B

Question 55

Which wall is drawn in the handbook during UR6 MOD composite core planning? A. Mesial B. Occlusal C. Palatal D. Buccal

Answer 55

B

Question 56

Which type of restoration is generally required for a root-filled posterior tooth with proximal wall loss? A. Direct composite only B. Amalgam build-up C. Cuspal coverage restoration D. Sealant

Answer 56

C

Question 57

Which factor has the GREATEST influence on the survival of a restored root-filled tooth? A. Type of post material B. Remaining natural tooth structure C. Shade of composite D. Flossing technique

Answer 57

B

Question 58

What is the primary purpose of placing a matrix band? A. Improve bonding B. Restore missing walls C. Provide occlusal clearance D. Reduce post space

Answer 58

B

Question 59

Which of the following must be confirmed before restoring a root-filled tooth? A. That it's in occlusion B. That it has enough restorability C. That a post can be placed D. That the crown margin is visible

Answer 59

B

Question 60

What step follows finishing and polishing the composite restoration? A. Remove gutta-percha B. Take a final radiograph and complete CAFS C. Etch enamel again D. Place an amalgam overlay

Answer 60

B