Fixed Prosthodontics UPDATED Exam
Questions and CORRECT Answers
Types of Articulators - CORRECT ANSWER- 1. Non-Adjustable
- least accurate
2. Semi-Adjustable
3. Fully Adjustable
- MOST ACCURATE, reproduces ENTIRE mandibular movements
Non-Adjustable Articulator - CORRECT ANSWER- - Only capable of hinging/rotation
(single units, non-complex occlusions)
-Distance b/w teeth and axis of rotation on the articulator is much shorter than it is in the
skull (results in error)
- least accurate
- hinge opening/closing
- distance b/w teeth and axis of rotation SHORTER THAN IN SKULL
- they then have SHORTER radius of movement, tooth travels a STEEPER arc
- particular discrepancy on the NON-WORKING SIDE
Semi-Adjustable Articulator - CORRECT ANSWER- - *is the type of articulator used for
MOST single units and FPD's*
- larger size, closer approximation of anatomical distance b/w axis of rotation and the teeth;
less error (crown, FPDs)
_ Reproduces direction and endpoints of movement but path is different (straight path vs.
curved)
- LESS ERROR
,- does NOT reproduce intermediate track of some condylar movements, but does reproduce
the direction and endpoints
- Restorations require SOME intraoral adjustments
- *intercondylar distance is NOT totally adjustable*
Fully-Adjustable Articulator - CORRECT ANSWER- = reproduces mandibular movements
in their ENTIRETY
- VERY EXPENSIVE
- require high skill and are time-consuming
- used for *reconstruction of ENTIRE occlusion*
Arcon vs. Non-Arcon - CORRECT ANSWER- Arcon = condylar elements placed on
LOWER member of articulator, just like in the mandible
- we use this
Non-Arcon = condylar elements placed on the UPPER member of the articulator
- condylar paths are attached to the lower member of the instrument
Advantages of Resin-Bonded Retainers - CORRECT ANSWER- - Minimal tooth reduction
- Supragingival margins
- Lack of pulpal involvement
- No anesthesia
- Natural tooth esthetics
- Reduced cost
Resin-Bonded Retains - Indication - CORRECT ANSWER- = single tooth replacement, or
replacement of TWO incisors
<15 degree taper MD
- shallow prep RESTRICTED TO ENAMEL, useful for YOUNGER PATIENTS****
Retention vs. Resistance - CORRECT ANSWER- Retention = prevents removal of the
restoration along the path of insertion or long axis of the tooth prep
Resistance = prevents dislodgement of the restoration by forces directed in an apical or
oblique direction
- prevents any movement of the restoration under occlusal forces
- resistance and retention are often inseparable quantities
The relationship between taper and retention drops off quickly after ________ degrees. -
CORRECT ANSWER- = 20 degrees
- for ever 5 degree increase in total convergence angle, the retention and resistance form may
decrease up to 50%
Preparation Length - CORRECT ANSWER- - for every 1mm increase in preparation length,
the retention and resistance form increases up to 10%
- the SHORTER the preparation, the LESSER the taper must be
- the LONGER the preparation, the GREATER the taper may be
Height:Base Ratio - CORRECT ANSWER- = should be greater than 0.4 for all teeth when
TOC = 10-20 degrees
Incisors/Premolars = 3mm
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