E2/Q2: Lect 6-Post MCC

Question 1

What type of crown am I? Complete coverage restoration consisting of a metal crown (substructure or coping) that is veneered (covered thinly) with a layer of fusible porcelain to mimic the appearance of natural tooth structure.

Answer 1

a MCC-Metal Ceramic Crown

Question 2

The porcelain veneer is composed of at least a thin layer of ______ porcelain to hide the dark metal casting underneath and a layer of _______ porcelain that closely matches the adjacent teeth.

Answer 2

OPAQUE… veneering

Question 3

“Know the layers”-Dr. P…From inside out: 1. Metal _______; 2. ______ porcelain; 3. ______ porcelain; 4. _____ porcelain; 5. _____ porcelain.

Answer 3

1. subsrtucture/coping…2.opaque….3. gingival…4.body….5.incisal

Question 4

Indications for a MCC: Teeth that require full coverage with high _______ demands (caries, trauma, replace existing restoration)

Answer 4

esthetic

Question 5

Indications for a MCC: Need for strength and _______

Answer 5

retention

Question 6

Indications for a MCC: Need to correct axial ______-

Answer 6

contours

Question 7

Indications for a MCC: Offers durability with superior _______ fit

Answer 7

marginal

Question 8

Indications for a MCC: Can serve as an RPD _____ crown

Answer 8

survey

Question 9

Indications for a MCC: Can serve as a FPD _______

Answer 9

retainer (the crown on top of an abutment)

Question 10

CONTRAindications for a MCC: Active ______, untreated _______ disease…large ______ (young patients), if a more conservative ______ is feasible

Answer 10

active CARIES…untreated Periodontal disease….large PULP chambers…more conservative RETAINER is feasible

Question 11

Advantages to an MCC: Strength PLUS ______, retentive AND ______, fairly ______ preparation compared to partial coverage retainers.

Answer 11

Esthetics…resistant…easy

Question 12

Disadvantages to MCC: Significant tooth _______

Answer 12

REDUCTION

Question 13

Disadvantages to MCC: _______ margins for esthetics

Answer 13

Subgingival

Question 14

Disadvantages to MCC: Slightly inferior in esthetics to all _______

Answer 14

ceramic

Question 15

Disadvantages to MCC: Subject to brittle ______

Answer 15

FRACTURE

Question 16

Disadvantages to MCC: More ______ and sometimes difficult ______ selection

Answer 16

expensive….shade

Question 17

*KEY-One of the LEAST ________ extra- coronal restorations available to the dental profession

Answer 17

conservative

Question 18

MCC Numbers to Memorize: Functional Cusp reduction

Answer 18

1.5mm

Question 19

MCC Numbers to Memorize: Central Groove Reduction

Answer 19

1.5

Question 20

MCC Numbers to Memorize: Non-Funcitonal cusp reduction

Answer 20

1.5

Question 21

MCC Numbers to Memorize: Labial Axial Reduction

Answer 21

1.5

Question 22

MCC Numbers to Memorize: Lingual Axial Wall

Answer 22

1.5

Question 23

MCC Numbers to Memorize: Path of withdrawal (ok not a number)

Answer 23

Parallel to long axis

Question 24

MCC Numbers to Memorize: Convergence

Answer 24

6 degrees

Question 25

MCC Numbers to Memorize: Chamfer width (metal)

Answer 25

0.5mm

Question 26

MCC Numbers to Memorize: shoulder width (porcelain)

Answer 26

1.5mm

Question 27

MCC Numbers to Memorize: IF we are doing a bevel (we haven’t talked about this yet… the Shoulder with will be _____mm and the bevel width is _____mm

Answer 27

shoulder 1.2mm bevel 0.5mm

Question 28

MCC Numbers to Memorize: Chamfer placement is for ______

Answer 28

esthetics

Question 29

MCC Numbers to Memorize: interproximal chamfer clearance

Answer 29

0.5mm

Question 30

Common Errors: Impairment of ________ health because of over- sizing or over-contouring crown.

Answer 30

periodontal

Question 31

Common Errors: Unaesthetic - caused by _______ layer showing through – not enough veneering porcelain.

Answer 31

opaque

Question 32

Common Errors: Improper occlusal relationships–under-reduction especially in ______.

Answer 32

central groove

Question 33

If a ceramic veneer is to be used, once the final contour of the wax pattern has been completed, the pattern is ________ over an even thickness–usually about ___ mm–to provide room for the porcelain fused onto the cast metal substructure

Answer 33

CUT BACK….1mm

Question 34

Thickness of the metal coping should be verified with _______

Answer 34

calipers

Question 35

________: To establish the CHEMICAL bond between metal & porcelain through the formation of a controlled OXIDIZED layer on the metal

Answer 35

Metal Oxidizing

Question 36

What happens AFTER the metal coping is oxidized?

Answer 36

Opaque layer is applied

Question 37

What are the 3 types of porcelain?

Answer 37

1.opaque 2.body 3.incisal

Question 38

OPAQUE pocelain: the ___ layer applied…2 major functions: 1.Mask the _____ color of the alloy…2.Responsible for the ________ between the metal and ceramic

Answer 38

1st layer applied….gray…chemical bond

Question 39

BODY porcelain: Is fired onto the ______ layer…It provides some ________ and contains metalic oxides that aid in the ______ matching.

Answer 39

OPAQUE…. translucency… shade

Question 40

INCISAL porcelain: is usually _______…The final shade and color is influenced by the color of the underlying _____ porcelain

Answer 40

TRANSLUCENT…. body

Question 41

*WHICH porcelain layer does the SHADE of the crown come from?

Answer 41

The BODY porcelain (opaque just covers the metal and incisal is translucent)