Anterior Tooth Selection Flashcards
Part of crown that goes below the gingiva on facial surface:
collar
base/rim of the crown (curvature form buccal to lingual edge of crown?):
ridge lap
Denture teeth are made of:
acrylic resin, porcelain, metal
How is the acrylic resin bonded to the denture base?
chemical bond
What minimizes wear in acrylic resin teeth?
double cross-linking of polymer chains
Negative aspect of acrylic resin denture teeth:
may stain over time
Easiest type of denture tooth to set:
acrylic resin
How are porcelain denture teeth bonded to base?
mechanically
Negative aspect of porcelain denture teeth;
wears opposing natural teeth, easily chipped/ fractured, prone to discoloration at interface with denture base (gingival margin)
What type of denture tooth has pins on the lingual surface of the anterior teeth?
procelain
These are found on the posterior portion of porcelain teeth:
diatoric channels
Functional benefit of metal teeth:
mechanical insert to increase chewing efficiency, stabilize VDO
tooth selection guides;
mold guides
class/ type I denture tooth:
square, M/D sides straight and parallel for 1/2 + of the crown
calss/ type II denture tooth:
tapering, M/D surfaces converge toward the occlusal surface
class/type III denture tooth:
ovoid, M: convex, D: compound curve, I: convex to concave as it passes toward the cervix
7 tooth forms:
square, square tapering, tapering, ovoid, tapering ovoid, square ovoid, square tapering ovoid
Theory presented by Frush nd Fischer:
dentogenic theory, square: old vigorous men, round: young delicate females
How to choose tooth shape:
pre-extraction casts, photos, current prosthesis
Anatomical indicators of tooth position:
Extraoral: alar width, commisures, lip length, Intraoral: extraction sockets, canine eminence
The junction of the commisure of the iips aligns with:
the distal surface of the canines
What is the width of the 6 anterior teeth about as wide as?
the alar width
Info that mold guides provide:
width of ant teeth on a curved or straight line, length of the CI
What is measured with a form selector?
Inner canthus and inter ala
Would you need a smaller or larger mold with Class II dental relationship?
smaller
What is chroma?
saturation of the color
Valuw:
brillaince, lightness or darkness, dilution with white or black
What is the most important aspect of shade selection
Value
Why do older people tend to have darker teeth?
enamel loss and staining
Why shouldn’t the anterior teeth be placed directly over the ridge?
resorption
Where should the labial surface of the CI be aligned?
8-10mm anterior tot he incisive papilla
Tilt:
The labio-lingual orientation of the long axis of the tooth
Inclination:
The M-D orientation of the long axis of the tooth
Tilt and inclination for the CI:
Little or no tilt, slight distal inclination
Tilt and inclination for the LI:
Moderate tile, moderate distal inclination
Tilt and inclination for the canines:
No tit, moderate to strong distal inclination
In which direction d the incisal embrasures become larger?
toward the distal (teeth should appear to be individual)
What are you hoping to achieve in protrusive excursion?
passive contact
How much horizontal overlap is there in Class I oclusion?
1-2mm
How much horizontal overlap is there in Class II oclusion?
2-12mm
How much horizontal overlap is there in Class III oclusion?
None
What to evaluate in the placement of the anterior teeth?
midline, length, width, incisal plane, lip support, phonetics, smile line, patient satisfaction
Anatomical guides for pts midline
incisive papilla, nose, philtrum, facial midline (not labial frenal attachmetn)
To where does the incisal edge extend?
often 1-2mm beyond the lip (highly variable)
The incisal plane should be:
parallel to the interpupillary line
From where should lip support come?
from the teeth, not the flange
Lips should appear:
everted (turned inside)
What is phonetic evaluation used for?
Vertical and horizontal overlap, VDO
What to look for when asking pt to make fricative sounds:
Max anteriors to contact the wet-dry line on lower lip
What to look for when asking pt to make sibilant sounds:
Anterior teeth should come close but not touch
How to evaluate the occlusal plane:
occlusal plane rises as it progresses posteriorily
Who has a more curved smile line, older males or younger females?
older males
A significant level of individuality can come from:
the mandibular anterior arrangement
How to change the esthetics from soft to bold and add character:
Grinding the incisal edge
