Marylands Flashcards
What are the 5 reasons for maryland failure
- Cement failure
- Endo failure
- Occlusion
-Perio - Caries
What are the 4 ways in which. Maryland can be displaced
Apically
Lingually
Occlusally
Rotational
How is apical displacement of a maryland bridges prevented
By 2 or more lingual rest seats
How is lingual displacement of a maryland bridge prevented
By mesial and distal grooves
How is occlusal displacement of a maryland bridge prevented
Acid etch and composite adhesive cement which requires lots of enamel
Why create guideplanes ? (4)
Ensure good path of insertion
Decrease risk of undercut
Allow for a taller wing
Better resistance retention form
What is the lingual preparation required for a lower 3-3 maryland bridge
0.3mm which should be just supragingival
3 lingual rest seats
1 lingual groove
What is the thickness of enamel at the gingival margin on a 3
0.29mm
How thick should a mesial groove be when prepping for a maryland bridge
0.5mm along the long axis of the tooth
What is the point of a lingual groove on a maryland bridge (2)
To prevent rotational displacement
To give structural rigidity
How deep should the lingual groove be
1mm deep and finish 3mm below the incisal edge
How many rest seats should there be on one abutment when constructing a 3-3maryland
3
What are the 3 cases that you can use a 3/4 crown for a bridge
Single anterior cantilever
Major or minor retainer in a fixed movable bridge
Fixed fixed situation when both abutments are mobile
How many walls does a groove have
2 (buccal and lingual)
What metal is used to construct a maryland wing
Nickel chromium
