Final Flashcards
3 considerations when prepping a tooth
Biologic
Mechanical
Esthetic
When prepping, what 4 things could possibly affect future dental health
Axial reduction
Margins
Occlusal considerations
Preventing tooth fractures
What 3 things should be considered in providing resistance
Magnitude and direction of dislodging forces
Geometry of tooth prep
Physical properties of luting agent
What 5 things are considered when providing retention form
- Magnitude of dislodging forces
- Geometry of prep
- Roughness of fitting surface of restoration
- Materials being cemented
- Film thickness of the luting agent
The three mechanical considerations are:
Resistance
Retention
Deformation prevention
define:
CVC
MCC
ACC
Complete veneer crown
Metal ceramic crown
All ceramic crown
Indications for a crown (5)
- Extensive coronal destruction
- Short clinica crowns
- Endo
- Maximum resistance/retention needed
- Correction of axial contours
3 Contraindications for crowns
Intact buccal or lingual wall
Less than maximum res/ret needed
If objectives can be met more conservatively
4 types of finish lines and with what type of crown they’re used
Shoulder -MCC, ACC, porcelain jacket crown Bevelled shoulder -MCC (buccal only) Heavy chamfer -High strength porcelain, buccal of MCC Chamfer -full metal, palatal/lingual of MCC, resin bonded
Chamfer edge is a _ angle
Obtuse
The 169 bur tip is _ wide and towards the shank it is _ wide
Tip and proximal widths of 747?
242?
- 5/0.8
- 5/1
- 8/1.2
3 causes of inadequate retention and resistance
Excessive convergence angle
Too short axial walls
Not enough surface area to resist tipping
7 things on the biological contour checklist
- Facial/ lingual convexities
- Mesial/distal concavities
- Transitional line
- Contact area and embrasures
- Cervical curvatures
- Marginal ridges
- Tooth reduction
Facial/lingual contours can extend how far beyond CEJ?
And 2 exceptions
0.5mm
Mandibular second premolar/molars - 0.75 to 1mm
An overcontoured restoration at the cervical level can result in_
Inflammatory response
Proximal surfaces are always _ b/t the contact area and the CEJ in order to _
Flat or slightly concave
Allow room for the papillae
Contact areas are in _ for all teeth except _ which have contacts in _
Occlusal third
Maxillary molars
Junct. Of occlusal and middle 3rd or mid 3rd
_ contacts are more cervical than _ for all teeth except _
Distal
Mesial
Mandibular first premolars
Marginal ridges converge from buccal to lingual for all teeth except _ and _
3 cusp mandibular 2nd premolar
Maxillary first premolar
Lingual embrasures are larger than buccal for all except _ and _
Why?
2/3
14/15
Long contact
Alginate is a _ which is a type of _
Irreversible hydrocolloid
Viscoelastic impression material
3 types of synthetic elastomers
Synthetic elastomers are a type of _
Polysulfide
Silicone
Polyether
Viscoelastic impression material
Two types of hydrocolloids
What is it made of
Alginate and Agar
Water bound within a colloid matrix
Difference b/t thermoplastic and thermoset
Thermoplastic doesn’t have cross-linking
