Principles of Tooth Prep I

Question 1

Functional cusp bevel is a part of

Answer 1

occlusal reduction (provide max. thickness of material in areas of max. occlusal forces)

Question 2

Diamond particles in burs are held in what kind of matrix

Answer 2

Ni or Ni-Cr

Question 3

What are the three princples of tooth prep

Answer 3

biologic-mechanical-esthetic

Question 4

Biologic factoes of crown prep

Answer 4

• Conservation of tooth structure (Prevent damage and injury to the pulp, adjacent teeth, gingival tissues, and oral tissues)
• Avoidance of overcontouring
• Supragingival margins
• Harmonious occlusion
• Protection against tooth fracture

Question 5

Mechanical factors of a crown prep

Answer 5

retention form
resistance form
deformation

Question 6

Esthetic factors of a crown prep

Answer 6

minimum display of metal
max. thickness of porcelain
procelain occlusal surfaces
subgingival margins

Question 7

What restoration required the highest amounts of endo after prep (single crown, ACC, PFDP, Extensive PFDP)

Answer 7

Extensive PFDF> PFDF> Single crown > ACC

Question 8

What is the most common complication in fixed

Answer 8

need for RCT

Question 9

Sources of pulpal stress during prep and provisional

Answer 9

• Extreme temps
• Pulp proximity
• Desiccation
• Chemical irritation
• Microbes

Question 10

Treatment for when a pulpal blush is seen

Answer 10

-Observation to endo

Question 11

How can you prevent aspiration when using interguards

Answer 11

fasten floss to the loops

Question 12

Teeth are - mm wider at the contact than at the CEJ

Answer 12

1.5-2 mm

Question 13

What are injured teeth (knicked adjacent teeth) more susceptible to dental caries than the original

Answer 13

• Original surface enamel contained higher fluoride conc.

- Interrupted layer more prone to plaque retention

Question 14

T/F Minor abrasions on the gingiva are ok

Answer 14

t

Question 15

Ways to prevent damaging the gingiva are

Answer 15

• Avoid oversized burs
• Deflect the gingiva
• Keep the bur on the tooth
• Good provisional
• Remove all excess cement

Question 16

What happens with gingival damage results in severed attachment

Answer 16

-Required surgical procedure to re-establish the biologic width

Question 17

Biologic width is _mm + _ mm for the sulcus

Answer 17

2… 1

Question 18

Reduction for CCC

Answer 18

1.5 FC and 1 NFC 0.5 margin

Question 19

Anterior and molar PFM reductions

Answer 19

Buccal margin= 1
Palatal margin= 0.5 mm 
Lingual reduction= 1mm 
Labial reduction= 1.2-1.5 mm 
Incisal reduction= 1.5-2 mm