Intro to Occlusion Flashcards
What are the different types of restorative materials for teeth?
- DENTAL AMALGAM
- COMPOSITE MATERIALS
- GOLD RESTORATIONS (GOLD FOIL)
- GOLD CASTINGS (INLAYS, ONLAYS, CROWNS)
- CERAMICS (CROWNS, BRIDGES, VENEERS)
What are the concerns with dental amalgam as a restorative material?
- poor esthetics
- weakening of tooth from removal of tooth structure
- recurrent caries
- no adhesive bonding
- sensitivity of properties to manipulation
- brittle nature
- biocompatibility (not a concern most of the time)
- wastewater pollution with mercury
What are the advantages of dental composite?
- aesthetics
- bonding to tooth structure
- more conservative in preparation of tooth
- less expensive than ceramic
- reduced mercury exposure
What are the disadvantages of composite?
- composite shrinks (secondary caries)
- durability (may not last as long as amalgam)
- chipping
- more skill and training
- needs to be completely dry
- takes longer
What does bonding allow the dentist to do with composite?
change shape, color, and contours
What is the oldest type of filling material available?
gold foil
What is the benefit of gold foil?
- can last the lifetime of patient
- can be placed in one visit in small cavities and will last longer than any other material
What is the disadvantages of gold foil?
- gold is expensive
- potentially not esthetic
How long will PFM crowns last?
Depends on the study!
- 95% success rate betwen 5-10 years
- 97.5% success rate at 7 years
- 95.5% success rate at 7 years
What are the options for tooth replacement?
- complete dentures (with implants)
- partial dentures (with implants)
- fixed bridges and single teeth (with implants)
What are the advantages of high strength ceramics?
- broad range of indications
- excellent clinical performance
- accepted metal alternative
- less tooth reduction required
- thinner coping thickness
- shading coping options
What is an articulator?
- mechanical device that simulates mandibular movements of condyles in their fossae
Why should you use an articultor?
- diagnosis
- treatment planning
- communicate with patients/patient education
- fabrication of prostheses/restorations
What are the components of an articulator?
- upper member
- lower member
- anterior or incisal pin
- condylar mechanisms
- mounting ring (guide and retention system)
What are the features of a non adjustable/”hinge” articulators?
- allow only opening/closing movements
- can be used for single posterior restorations
- can create a change in closure angle
What are the features of semi-adjustable articulators?
- articulators used the most
- allow opening and closing
- movements as well as escursive
- lateral and protrusive movements
What are the types of semi-adjustable articulators?
Arcon
- condyles in lower member
- condylar inclination in the upper member
Non Arcon
- condyles on upper membrane
- condylar inclination on the lower member
What are the two types of facebows?
Kinematic
- locates the true transverse horizontal axis
Arbitrary
- locates the axis by using anatomical landmarks (utilizes average measurements to approximately located the axis of rotation)
What is the purpose of a facebow?
orient the maxillary cast to the rotational axis in three planes
- result in a reproducable articulation of the subsequent maxillary casts
What type of articulator is ours?
Arcon Articulator (a type of semi adjustable)
What is the transverse horizontal axis (terminal hinge axis)?
- imaginary axis which passes through each of the mandibular condyles
Where is the transverse horizontal axis on a human?
about 8 mm under the soft tissues in front of the tragus
What is the bergstrom point?
a point 10 mm anterior to the center of a spherical insert in the external auditory meatus and 7 mm below the frankfor horizontal plane
What is the ear-bow?
indexes to external auditory meatus and registers the relation of the max arch to these and a horizontal reference plane
What is the 3rd point of reference on an ear-bow (facebow)?
- oritents the maxillary cast to a reference plane
- on the anteior face (should be repeatable and reproducible)
What are the different options for the 3rd point of reference with a facebow?
orbitale
nasion
maxillary incisor incisal edge
lower edge of the nostril
When should you use a facebow?
- cusp teeth are present
- interocclusal records are made at an increased occlusal vertical dimention
