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38 Cards in this Set
- Front
- Back
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What are the 5 elements to a good diagnostic workup in preparation for fixed Prothodontic treatments?
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Patient Hx, TMJ/Occlusal evaluation, Intra-oral exam, Diagnostic casts, and FMX radiographs
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What are some indications for fixed Prosthetics?
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Caries w/significant loss of tooth structure and coronal strength, Trauma, Endodontics usually require full coverage restoration, Esthetics, and other
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What is an inlay?
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A restoration which lies within the cusps of a tooth
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How much occlusal reduction is indicated for a full veneer crown?
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Depends on the restoration materials
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Where do inlays get their resistance and retention?
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Internally
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Where do Onlays and full veneers get their retention and resistance?
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External walls must converge towards occlusal and inter line angles must diverge to allow for insertion.
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What does resistance account for?
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Prevents dislodgment of the restoration by oblique or apical forces and prevents movement of restoration under occlusal forces.
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What prevents the removal of the restoration along the path of insertion?
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Retention
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What type of cement is ideal for long term placement in the oral cavity?
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No cement is suited perfectly for this environment long term.
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What is the most important factor under the operators control that determines whether or not a restoration will remain cemented to its prep?
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The geometric shape.
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What is the approximate angle of our tapered diamond instruments?
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3 degrees.
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How does retention relate to surface area when it comes to crown preps?
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Greater surface area = greater retention.
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How would doubling the diameter of a prep affect retention?
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It would increase it as the area of the axial walls would be quadrupled.
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Would are larger or smaller crown be more likely to fail?
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Larger crowns are more likely to fail as most of the lines of action fall within the margins of the restoration and so minimal torque and rotation exist.
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How does a longer crown on the same prep fair?
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It is more likely to fail due to a longer lever arm.
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What does Draw refer to with crowns etc?
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all prep components must provide a path that allows the restoration to be seated. Undercuts will distort wax and prevent proper seating of the crown.
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How do you fix and undercut?
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You can fill with a basing material or remove tooth structure superior to the undercut and don’t get near the margin!
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How are draw and path of insertion different?
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Path of insertion relates to the influence of proximal teeth on seating the crown. On a bridge each crown must draw individually, but their paths of insertion must be parallel to permit insertion and seating of the crowns.
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What is the usual path of insertion for posterior full crowns?
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Parallel to long axis of the tooth.
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How do you accurately assess draw?
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By using one eye at 30cm.
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What are depth cuts?
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They facilitate accurate consistent reduction for crown preps.
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What is a chamfer?
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A preferred type of margin for metal and PFM
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What type of margin is required for porcelain restorations?
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Shoulder or butt margins
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What are beveled margins good for?
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Metal Only!
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What types of materials are good for buildups where strength is important?
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Amalgam, or large particle composite
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When can Resin reinforced glass ionomer be used?
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In situations where strength is not critical.
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What do all build ups require?
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Mecanical retention.
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What are the basing materials that can be used in crown preps?
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Vitribond, Glass Ionomer cement, Compomers, Flowable composite, and composites not dycal or IRM
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What tapered diamond burs do we use for a chamfer?
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c 856-014 and c856-016 (1mm and 1.25mm)
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What is the diamond football used for?
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Occlusal reduction and reduction of linguals on incisors and cuspids (c379-023)
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What do the colors mean on the diamond burs?
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Black-extra course, Green-course, Red-fine, and Yellow-extra fine
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Which diamond burs cut faster and cooler?
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The more course burs.
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What are fine and extra fine diamond burs used for?
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Only finishing.
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What are the carbide tapered burs used for?
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Interproximal cut throughs, grooves, and box preps. (100 series= flat tipped 1100 series is end cutting round tipped)
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What are the carbide 12 fluted finishing burs for?
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Finishing margins, adjusting occlusion and smoothing the axial walls. Some say not to smooth axial walls for better retention.
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How deep should the depth cuts be?
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1.0 mm on non-functional cusps and 1.5 mm on functional cusps.
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What is worse and why, too little occlusal reduction or too much occlusal reduction?
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Too little is worse as there will be no room for the material where the lab can compensate for too much occlusal reduction in the fabrication of the restoration.
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How does Taper affect retention?
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Less taper = more retention and 3 degrees is ideal. 3 degrees on each side gives a 6 degree convergence angle of the axial walls
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