Chapter 11: Tooth Selection Flashcards
Provides upper lip support:
Both tooth and denture base
What portion of canine should be more prominent due to the labial placement of the tooth?
Cervical portion
Bone type in maxillary anterior residual ridge:
mostly cancellous bone, absorbs quickly in response to force
Placement of incisal edges of mandibular teeth
should not be placed forward of a plane perpendicular to the center of the labial vestibule, and under no circumstances should they be positioned over the anterior land area of the cast, leads to cantilever effect and instability
When not to have vertical overlap of the anterior teeth:
nonbalanced type of occlusion
What determines amount of incisal guidance?
Degree of hor and vertical overlap
incisal guidance should not lead to:
posterior teeth discluding in excursive movements (don’t want Christensens phenomenon)
no more than __d incisal guidance greater than the anterior-posterior angulation of the plane
of occlusion.
20
Discluding in excursive movements:
Christensens phenomenon
To minimize incisal guidance:
decrease vertical overlap, increase horizontal
To minimize separation of posterior teeth in excursive moves:
decrease steepness of incisal guidance
When should anterior teeth contact lightly?
protrusive or working moves, required for tearing off bits of food, incising
“Kissing contact” should be achieved when
in protrusive movement (check on my dentures) - it seems theoretically easier to align the mandibular in this manner. Why don’t we?
TF? The need for an overlap is often not obvious during the maxillomandibular records appointment
T
How to set the condylar inclination of the articulator:
make protrusive or lateral interocclusal records to
man denture teeth should not be placed beyond this point:
point at which the residual ridge
begins to slope up toward the retromolar pad.
Mandibular posterior teeth to be eliminated if not enough room:
first premolar or second molar, remove first premolar for better mastication
Non balanced occlusion mandibular posterior tooth placement:
flat occlusal plane, the long axes perpendicular to the plane of occlusion
Balance occlusion posterior tooth arrangement:
arranged to a compensating curve, anterior-poste-
rior and medial-lateral curvature of the occlusal surfaces, to create the excursive contacts required
for a balanced occlusion
Placement of first premolar in dentures:
B surface aligns with B surface of canine, CG should align with either the contact point between the canine and lateral incisor or tip of the canine
Placement of man molars:
Directly over ridge, aids in stability
Correct arrangement of man pre and molars:
CG’s centered over ridge and all CG’s align with each other
To calculate original width of the patient’s central incisors:
photo interpupillary/ actual interpupillary = photo CI width/ actual CI width (X)
Large maxillary ridges, at least __ mm, small ridges less than _mm.
53, 50
occlusion rims must be correctly contoured to provide:
lip support, esthetic and phonetic demands.
Points to mark at the wax tryin:
midline, high smile line, relaxed corners of mouth
High smile line coincides with:
minimum incisogingival height of the maxillary anterior teeth
relaxed corners of mouth coincides with:
canine to canine width (all anteriors)
Anterior tooth width for patients with obvious contraction or distortion of the corners of the mouth
interalar width. centerline of canine w outer edge of alar
add __ mm to the interalar measurement to produce the width of the six maxillary anterior teeth, from distal of canine to distal of canine
7
TF? African-American patients usually require one size larger category mold thamn indicated by interalar width
F. smaller (wider noses, on average)
Trubyte tooth indicator:
size, outline, and profile forms of maxillary anterior teeth
Tooth width and length are based upon an average __ ratio of the bizygomatic width and height of the face in relation to the width and length dimensions of the maxillary central incisor
16:1
Reference points for Trubyte Tooth indicator:
forehead, base of nose, point of chin
Invoclar Vivadent Blueline Form Selector uses:
Interalar dimension with tooth mould width
How does tooth shape change with age?
become less rounded, decreasing display of the maxillary anterior teeth and a greater display of the mandibular, curvature of smile line flattens
Posterior tooth selection is based on:
size of anteriors
mesiodistal length of the posterior teeth is governed by:
length of edentulous mandibular ridge
What can get irritated if you place teeth on the slope to the retromolar pad?`
lingual aspect of the anterior ridge
If no slope is present where should the mandibular measurement begin?
retromolar pad
Do extracted teeth tend to lighten or darken in time?
lighten
Why not to show pts the entire shade range for teeth:
focus on lightest shades
How to reduce light intensity when matching tooth color:
squint, tab that disappears first is best match
shade guide tooth should be observed in three locations:
1) outside the mouth and beside the cheek, 2) under the upper lip with incisal edge exposed and 3) under the upper lip with mouth open and two-thirds to three-fourths of tooth exposed
How many shade options should you give the pt?
2 or 3
Greatest error in tooth selection:
too light in shade or too small
