Prep Rally
The circumferential reduction of a posterior tooth for a lithium disilicate crown that will be bonded
1.0mm
Accepting these types of records makes it a Celenza 3B articulator
Protrusive and lateral records
This principle states that the combined root surface area of the abutments should equal or exceed that of the teeth being replaced
What is Ante's Law
The most important location to have a ferrule on maxillary anterior teeth
Lingual surface
The minimum thickness of Zircad Prime for a crown in the anterior and posterior region
Anterior: 0.8mm; Posterior: 1mm
The reduction for lithium disilicate veneers
0.7mm incisal, 0.6mm deep
This is the average tooth show in repose for males and females
Males: 1.9mm; Females: 2.5-3mm
These are the different FDP pontic designs
Hygienic, ridge-lap/saddle, modified ridge-lap, ovate, conical
The ideal parameters for a post within an endodontically treated tooth
4mm GP left in canal, post 2/3 of canal space, post 1/2 the length of the crest of the alveolar bone to root apex
Adding more yttria content to your zirconia will increase this
Translucency (and it stabilizes zirconia in the cubic phase)
The reduction for a lithium disilicate crown that will be luted
1.0mm margin, 1.5mm elsewhere (needs 4mm of coronal height)
These 3 P's are used to help treat bruxism
Pills, plates, psychology
The connector size for a Zircad Prime 3-unit FDP in the anterior or posterior region
The ideal dimensions for a ferrule
Height 1.5-2mm, thickness 1.0mm
1200 MPa at 3Y dentin zone; 650 MPa at 5Y incisal zone
The reduction for lithium disilicate in an anterior tooth
1.0mm margin, 1.2mm elsewhere
(facial and incisal are 1-1.5mm, lingual is 1-1.2mm)
The 9 principles of biologic occlusion
1: CO = MIP
2: Minimum 1 contact per tooth
3: No non-working contacts
4: Cusp/fossa occlusion
5: Canine guidance or group function
6: No posterior contacts in protrusion
7: No cross-tooth interferences on the working side
8: No fremitus
9: Neuromuscular release
Of the two major connector dimensions, increasing this dimension has the greatest effect on the rigidity of an FDP
You might explore these options if you have inadequate ferrule
Crown lengthening or orthodontic extrusion
This phase of zirconia stops crack propagation in transformation toughening
Monoclinic phase
Goodacre's Principles for tooth preparation (11)
1: TOC 10-20 degrees
2: Min heigh incisors/premolars: 3mm, molars 4mm
3: Ratio of occlusal table: B/L >0.4
4: Occlusal and circumferential irregularity
5: In absence of resistance, create boxes/grooves
6: Finish line supragingival when permitted (not into epithelial attachment when subgingival)
8: Finish line form (chamfer for metal, chamfer or shoulder for ceramic)
9: Adequate reduction
10: Rounded line angles
11: Surface texture
In optical scanners, ____ is a reflection of how correct a scan is compared to the actual dimensions, and ___ is how repeatable or reproduceable the measurements are.
What are trueness and precision
This is the minimum acceptable crown-to-root ratio for an FDP abutment
1:1 (2:3 is more favorable)
This is where the ferrule is measured from
The finish line
This is what the numbers 3, 4, and 5 mean in 3Y, 4Y, and 5Y. Bonus if you know which crystal structures are in each
Mole percentage of yttria (yttrium oxide) added to the zirconium dioxide to stabilize its crystal structure at room temperature
3Y: mostly tetragonal (max strength)
4Y: balanced mix of tetragonal and cubic
5Y: 50% or more larger cubic crystals