onlay preps

Question 1

onlay

Answer 1

1) mechanical and adhesive means
2) restores one or more cusps and come or all of occlusal surfaces

Question 2

onlay materials

Answer 2

1) gold, zirconia, lithium disilicate - emax

Question 3

gold

Answer 3

1) retention and resistance
2) internal and external

Question 4

preparation design

Answer 4

1) what determines the prep is the extent of fracture and restorative material

Question 5

implant cycle

Answer 5

1) filling
2) bigger filling
- what about onlay!
3) BU and crown
4) RCT, BU, crown
5) extraction
6) implant

Question 6

retention and resistence

Answer 6

1) retention
- prevent displacement along path of insertion
2) resistance
- prevent dislodgement by apical or oblique force

Question 7

occlusal reduction

Answer 7

1) determined by restorative material thickness 1-1.5 for LD/emax
2) enamel quantity not supported by dentin
2) reduce until sufficient quantity of dentin supporting enamel
4) enamel/dentin thickness (BLwidth) >2 mm for vital teeth, and 3> mm for endo treated teeth

Question 8

generic criteria

Answer 8

1) isthmus > 2 mm
2) inner walls diverge 6-10 degree
3) cusp reduction 1.5-2
4) rounded line angles
5) include buccal amalgam, but not a butt joint finish
- make a buccal margin below cusp 2 mm > 1mm

Question 9

mandibular 1st molar

Answer 9

1) overlay, occlusal veneer, compression dome etc

Question 10

the tiger king

Answer 10

1) preserve most of enamel on lingual side, make like a veneer on buccal
2) a vonlay
- no isthmus
- buccal axial angle needs to be smooth and rounded

Question 11

bonding protocol

Answer 11

1) isolation
- isodry or rubber dam
2) full bonding protocol
3) technique sensitive

Question 12

14 DOL onlay - LD

Answer 12

1) replace DL cusp similar to buildup prep using rounded internal features

Question 13

19 MOD overlay

Answer 13

1) make existing MOD prep smooth

Question 14

4 or 5 vonlay

Answer 14

1) do the mullet