Operative Dentistry

Question 1

If someone has a high smile line, what would you expect to see clinically?

Answer 1

All of the clinical grown and gingivae

Question 2

What would you suspect from a patient with Linea Alba on buccal mucosa?

Answer 2

A para functional habit

Question 3

What are two kinds of articular that you might mount your study casts on?

Answer 3

Semi-adjustable articular

Average value

Question 4

What are some advantages of diagnostic wax-up

Answer 4

Can check;
Aesthetics
Occlusion
Shows your intentions to the patient

Question 5

What phase of the treatment plan would fixed prosthodontics come under?

Answer 5

Reconstructive

Question 6

Name two instances that a tooth would be deemed unrestorable and extraction is indicated?

Answer 6

Caries spread beyond the level of the alveolar crest

A horizontal fracture renders a tooth unrestorable

Question 7

Name 5 reasons to place veneers?

Answer 7

Improve aesthetics
Change teeth shape and/or contour
Correct peg shaped laterals
Reduce or close proximal spaces and diastema’s
Align labial surfaces of instandng teeth

Question 8

Name 5 reasons when not to use veneers?

Answer 8

Poor OH - high caries rate
Gingival recession
High lip lines
Heavy occlusal contacts
Root exposure
If extensive prep needed

Question 9

Why is someone has root exposure, may you not place dentures>

Answer 9

Want to bond veneers onto enamel and if the root is exposed, most likely dentine and therefore will not have as good a bond

Question 10

What are the 6 principles of crown preparation?

Answer 10

1. Preservation of tooth structure
2. Retention and resistance
3. Structural durability
4. Marginal integrity
   5.Preservation of the periodontium
   6.Aesthetics considerations

Question 11

Define retention in relation to crown prep

Answer 11

Prevents removal of the restoration along the pat of insertion or the long axis of the tooth prep

Question 12

Define resistance in relation to crown prep

Answer 12

Prevents dislodgement of the restoration by forces directed by apical or oblique direction and prevents any movement of the restoration under occlusal force

Question 13

What is taper

Answer 13

Ideal inclination of opposing walls 6-10 degrees

Question 14

Why do we not want longer walls in crown prep

Answer 14

Longer walls interfere with tippling displacement

Question 15

What is the path of insertion with relation to fixed pros

Answer 15

Imaginary line along which the restoration will be place onto or removed from the prep

Question 16

How are retention and path of insertion related

Answer 16

Retention is improved by limiting the number of paths of insertion

Question 17

For structural durability to be achieved in crown prep, the restoration must contain a bulk of material that is adequate to withstand the forces of occlusion.
How is this achieved;

Answer 17

Through;

• occlusal reduction
• functional cusp bevel
• axial reduction

Question 18

What is the minimum the occlusal reduction on the crown prep must be

Answer 18

2mm thick

Question 19

When would you use a chamfer finish line?

Answer 19

Used for veneer preps

Metal based restorations usually

Question 20

When would you use shoulder finish line

Answer 20

Usually for ceramic based

Question 21

Preservation of the periodontium is one of the principles of crown preparation.
What three things should the margins of the restoration be?

Answer 21

1. Smooth and fully exposed to a cleansing action
2. Placed where the dentist can finish them and the patient can clean them
3. Placed supra-gingival or at the gingival Margin where possible

Question 22

What is an occasion that placement of margins in a crown prep may be sub-gingival.

Answer 22

When a patient has a high smile line they want to hear margins, not too high will make it hard to clean

Question 23

What is the biological width of the tooth/

Answer 23

Height between very depth of the sulcular epithelium and the most coronal part of the alveolar bone

Question 24

What is a cantilever bridge

Answer 24

This is a bridge that is held on at one side

Question 25

What are the conventional clinical stages of indirect restorations

Answer 25

1. Preparation
2. Temporisation
3. Impressions and occlusal records
4. Cementation

Question 26

What are two advantages of inlays compared to direct restorations

Answer 26

Superior materials and margins
Won’t deteriorate over time

Question 27

What are disadvantages of inlays compared to direct restorations

Answer 27

Time and cost

Question 28

What should the isthmus width in a ceramic inlay be

Answer 28

1.5-2mm width

Question 29

What is the difference between and onlay and an inlay

Answer 29

Onlays are like inlays however they have cuspal coverage