Intro to fix prosthodontics Flashcards
What is the collective term for preventive measures and foundation procedures that are needed before definitive prosthodontic care can be provided?
-Mouth preparation
Mouth preparation often involves reorganization of the patient’s occlusion, typically to make _________ _________ coincident with ______ _______ and remove eccentric interferences.
- Maximum intercuspation
- Centric relation
T/F CO = CR is done sometimes as a prerequisite to extensive restorative treatment
True
Where do fractured teeth most commonly occur?
-Base of existing fillings
What are two clinical tests to check for fractured teeth?
- Cold sensitivity
- Pressure sensitivity
Place in order from 1 to 4 in prosthodontic sequencing. Muscles Anterior teeth Joints Posterior teeth
1) Joints
2) Muscles
3) Anterior teeth
4) Posterior teeth
What are five foundation materials?
- Amalgam
- Composite resin
- Glass Ionomer
- Resin modified glass ionomer
- Zinc phosphate
What is the best all -around material for foundation materials for fix pros?
-Composite resin core material
T/F For build up materials you do not want to use dual cure material
False
-You want to use dual cure material for build up material
What are the three major principles of tooth preparation?
- Biologic
- Mechanical
- Esthetic
What is the margin gap with milled zirconia restorations?
-40 um
What is an advantage of a chamfer margin design?
- Distinct margin
- ‘Adequate bulk
- Easier to control
What are the disadvantages of a chamfer margin design?
-Care needed to avoid unsupported lip of enamel
What are the indications of a chamfer margin design?
- Cast metal restorations
- Lingual margin of metal ceramic crowns
T/F The use of complete coverage restorations conserves more tooth structure than partial coverage fixed pros.
False
-Partial coverage conserves more tooth structure
What form of tooth preparation prevents dislodgement of restoration parallel to path of insertion?
-Retention form
What are three things in a preparation geometry that increases retention?
- Increased axial surface area
- Increased preparation height
- Decreased Taper of Axial walls
What type of cements are the most retentive?
-Adhesive Resin Cements
Does the roughness of the intaglio surface increase or decrease retention?
-Increase
Which has greater retention? Molar complete crown
Intracoronal restoration, Premolar complete crown
Partial crown
Most — Molar complete crown
Premolar complete crown
Partial crown
Least — Intracoronal restoration
What form prevents dislodgement of restoration along a path other than path of insertion (tipping?)
-Resistance form
Does decreased preparation diameter will you have increased or decreased resistance form?
-Increased
Does complete seating of restoration lead to increased or decreased resistance?
-Increased resistance
Do luting agents with increased compressive strength lead to increased or decreased resistance?
-Increased resistance
Do luting agents with increased modulus of elasticity have increased or decreased resisitance?
-Increased resistance
What prevents dislodgment of restoration due to permanent deformation (bending) of restoration during function?
Anti-deformation form
What four factors influence deformation?
- Material selection
- Adequate tooth reduction
- Proper occlusal or lingual concavity reduction form
- Margin design
What is type I alloy selection used for?
-Inlays
What is a type II alloy used for?
- Inlays
- Onlays
- Single units
What is a type III alloy used for?
- Single units
- Bridges
What is a type IV alloy used for?
-Long span bridges
What are three parts of the mechanical principles in tooth preparation?
- Retention form
- Resistance form
- Deformation
What are two types of glass ceramic?
- Feldspathic porcelain
- Lithium Disilicate
What is a type of crystalline ceramic?
-Zirconia
What type of ceramics are usually bonded?
-Glass ceramics
What type of ceramics are usually cemented/luted?
-Crystalline
On metal-ceramic restorations what amount of occlusal reduction should be done?
-2.0 to 2.5 mm
On metal-ceramic restorations what amount of facial axial reduction should be done?
-1.2 to 1.7 mm
T/F Feldspathic porcelain is a non-abrasive type of porcelain
False
-It is abrasive
What is an advantage of a shoulder margin design?
-Bulk of restorative material
What is a disadvantage of a shoulder margin design?
-Less conservative
What are the indications for a shoulder margin design?
- Facial margin of metal-ceramic crowns
- Complete ceramic crowns
