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Teaching of Fixed Prosthodontics A Paradigm Shift - Exam 76
by Korioth, Lea, Simon, McBride
Restorative dentistry is experiencing a significant shift towards a rising usage of
tougher all-ceramic materials. This trend must be incorporated into existing fixed
prosthodontics academic curricula through the integration of lithium disilicate and zirconium oxide crown preparation guidelines. In addition, crown fabrication
techniques have also evolved for these newer materials through digitization of
preparations and impressions and their computer-assisted manufacturing. This
article reviews current crown preparation and cementation guidelines while
describing the teaching program in fixed prosthodontics at the University of
Tennessee Health Sciences College of Dentistry.
1) Single unit lithium disilicate fixed dental
Have up to 400 MPa of flexural strength.
Are particle-filled glass ceramics
Need 1mm deep shoulder margins with slightly rounded gingivoaxial line angles.
All of the above.
2) Single unit monolithic zirconia fixed dental
Have very high flexural strength.
Ideally need to have 1.2 to 1.5mm of occlusal thickness.
Only need 0.3 to 0.5mm deep chamfer margins.
Allow for less aggressive tooth preparations.
All of the above
3) The single most frequent clinical problem with PFZ FDP is:
Adhesive / cohesive failure of porcelain
4) Choose the correct answer - Polishing of monolithic zirconia, lithium disilicate and porcelain:
Should only be accomplished intraorally after cementation.
Glazing protects against enamel wear.
Adjusted and polished zirconia produces more tooth wear than adjusted and glazed zirconia.
Intaglio adjustment of full porcelain FDP should be avoided to decrease the risk of microfractures.
5) Choose the wrong answer - In terms of cementation and removal of all ceramic FDP:
All porcelain FDP should be bonded on prepared teeth.
Monolithic zirconia FDP must be cemented with zinc phosphate.
In case of good retention and resistance forms, glass ionomers can be used as luting media for zirconia FDP.
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