Quiz 1 - Basic Terms and #30 Prep Flashcards
At the end of the course, you should be able to prepare ______ and ______ for both molars and bicuspids
CVC (complete veneer crown)
MCC (metal ceramic crowns)
What are the dates for the practicals and exam
Feb 4
Mar 6
April 15
Exam; April 25
True or False
The textbooks are “Contemporary Fixed Prosthodontics” and “Dental Materials and Their Selection”
True
Daily lab grades constitute ____% of the final grade
15
The written final+quiz, and both the midterm practicals compose ____% of the final grade respectively
20
The final practical constitutes ____% of the final grade
25
You need at least an average of ___ to pass the course on both the didactic and laboratory portion
2.0 (65%)
The grades are based on an OSU or OSI scale; which means
Oustanding (Excellent)
Satisfactory
Unsastifactory (in need of improvement)
The final shape (form of the tooth, produced by instrumentation) to receive a restoration
Preparation
Extracoronal preparation involving the entire clinical crown
CVC preparation
A cast-gold extracoronal restoration which covers the clinical crown
CVC
The imaginary line along which a casting is moved when it is separated from its prepared tooth
Path of Withdrawn (POW)
For single crowns the POW should be nearly coincident with the _____ _____ of the tooth
long axis
Part of the crown preparation prepared in the long axis of the tooth - can be designated as buccal, lingual, medial or distal
axial wall
The angle or taper formed by diametrically opposed axial walls
convergence angle
The cervical junction of the prepared axial wall and the unprepared portion of the tooth structure; it extends around the most cervical portion of the tooth preparation
chamfer
The lines formed by the junction of any two tooth surfaces; should be rounded in complete crown preparation
line angle
The junction between any two axial walls
axial wall line angle
the junction between the occlusal surface and an axial wall
occlusoaxial line angle
the junction of prepared (cut) to unprepared (uncut) tooth structure
cavo-surface line angle
grooves placed on the surface of the tooth to provide a reference to determine when sufficient tooth structure has been reduced
depth orientation grooves
a wide bevel placed on the functional cusps (the buccal inclines of the mandibular buccal cusps and the lingual inclines of the maxillary lingual cusps)
functional cusp bevel
a crown preparation is ________ if a wax pattern cannot be withdrawn from its die with distortion; can be caused by depression via carious lesion, diametrically opposed axial walls that do not converge occlusally caused by improper angulation of the cutting instrument
undercut
The distance between the occlusal surface of the prepared toot and the occlusal surface of the opposing tooth; clearance must be evaluated during excursive jaw movements, as well as in intercuspal position
occlusal clearance
the characteristics of the tooth preparation which tends to resist the removal of the restoration along its POW
retention form
the characteristics of a tooth preparation which tends to prevent dislodgment of a seated restoration by forces directed in an apical or oblique direction; prevents dislodgment of the restoration by occlusal forces
resistance form
Advantages of CVC; _____ strength, ________, _____ _____ to displacement, ability to modify _____ ____ and _______
high
longevity
high resistance
axial contours and occlusion
Disadvantages of CVC; display of ______, ______ of tooth substance, ______ testing, ______ close to _____ tissue
metal removal vitality margin gingiva
True or False
The following are indicative for a CVC; extensive destruction by caries or trauma, endodontically treated teeth, large existing restorations, maximum retention needed, recontouring of axial surfaces, correction of malinclination, correction of occlusal discrepancies, and to provide contours suitable for a removable partial denture
True
Contraindication fo CVC
wherever a tooth can be adequately restored with a more conservative restoration
Principles of tooth preparation; _______ of tooth structure, _______ _______ of the restoration, _______ and ________, _______ durability
conservation
marginal integrity
retention and resistance
structural
Ideal width of the margin
0.5mm
recommended range of convergence angle
2-10 degrees
The tooth-restoration interface at the _____ _____ is a potential site of failure due to cement dissolution or roughness
gingival margin
Inadequate retention and resistance form may lead to _______ of the restoration during function; can be caused by excessive convergence angle, inadequate height, insufficient surface area
displacement
the restoration must have sufficient bulk to ____ ____ and allow for west during service, however and unnecessarily thick casting is indicative of excessing tooth preparation
resist distortion
functional cusp dimension
1.5mm (1.3mm-1.7mm)
central groove dimension
1mm (0.8mm-1.2mm)
non-functional cusp dimension
1mm (0.8mm-1.2mm)
chamfer width dimension
0.5mm (0.4mm-0.7mm)
the tapered bur converges approximately _______ degrees from the cervical towards the occlusal; it includes the _____ bur
3-4
242.6M
The steps for tooth reduction (5)
- occlusal grooves
- occlusal reduction
- axial grooves
- axial reduction
- finishing and evaluation
It is important to make a new _____ _____ _____ for each tooth and prep you are making
silicone reduction guide
True or False
When making a silicone reduction guide it is important to cut on either the distal or medial side of the buccal groove
False; it should be cut down the middle of the groove
Place all grooves at _____ depth shallower than the intended depth
0.2mm
Make all grooves and reductions with a _____ bur
242.6M
Place depth grooves at the ______ of each triangular ridge and in the _____
height
grooves
True or False
Remove tooth structure in-between the grooves first, as in remove the islands of tooth
True
The functional cusp bevel needs to be at ____ degrees to the long axis
45
You will place _____ axial wall grooves
3
one in the center, and one at each medial and distal line angle
The axial wall grooves determine the eventual _____ _____ ____
POW
Mandibular molars generally have a _____ inclination
lingual
True or False
It is not important to mark the tooth with a pencil line indicating the height of the chamfer border
False; always mark 0.5mm above gingiva
It is important to have _____ mm of clearance inter-proximately; going _____-gingival may be necessary
0.5mm
sub-gingival
True or False
Use straight lines when coin the axial wall reduction and follow tooth contour during occlusal reduction
False; straight occlusal, tooth contour the axial
Attack the inter-proximal region from ____ side(s) of the tooth leading a narrow island which is removed with a _____ bur
both
747.6M
The cavourface angle should be ______; no sharp lip on enamel
obtuse (slightly greater than 90 degrees)
It is important to ______ the sharp internal line angles
round
lingo-osslucal line angle reduction
0.8mm
