arrangement of teeth
TRANSCRIPT
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ArrangementArrangement ofofteethteethArrangementArrangement ofofteethteeth
ByBy
Dr. IBRAHIM RAMADAN ELTORKYDr. IBRAHIM RAMADAN ELTORKYAss. Professor of Prosthodontics
Faculty of Dentistry
Tanta University
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Occlusion rims are used to make fivedeterminations:
1. Proper lip contour.
2. Proper placement of occlusal plane.
3. Correct vertical dimension of occlusion.
4. Placement of guiding lines.
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Occlusion rim is
used as a guidefor arrangementof artificial teeth
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Physiologically.
must be compatible with lips, cheeks andtongue.Esthetically.
must be correctly positioned.
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Anterior teeth:
Three important factors must be considered;
1. Esthetics.
2. Phonetics.
3. Incision.
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Correct position of
max. Anterior
teeth to satisfy:
1. Esthetic.
2. Phonetics.
3. Incision.
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Four important factors must be considered:
1. The crest of the lower ridge.
2. Compensating curves.3. Common horizontal plane.4. Spacing of max. posterior teeth.
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The palatal cusps of upper posteriorteeth are positioned parallel to and
directly over the lower ridge crest.
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The palatal cusps of upper posterior teeth arepositioned parallel to and directly over the lowerridge crest.
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Relationship of maxillary
palatal cusps to the
mandibular ridge.
Cusps are placed over thelower ridge crest and thus
occlude with the central
fossae of the mandibular
posterior teeth.
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The posterior teeth must be arranged in
such a way that upper and lower teeth
remain in contact in centric andexcentric excursions during the
chewing process.
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Are artificial curves
introduced into
dentures in order to
facilitate the
production of
balanced occlusion.
Artificial counterparts
ofcurve of Monsonand curve of Spee.
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The occlusal surfaces of upper right andleft posterior teeth must be on the same
horizontal plane or level.
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Posterior teeth are spaced by to mmin order to:
To make proper adjustment when arranging thelower posterior teeth.
To prevent crowded arrangement when setting thelower first premolar.
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Movement of the mandibleto the side wheremastication is to beperformed is called
working side.The other side where the
teeth are cusp to cuspcontact is called
balancing side.
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The buccal cusps ofmandibular teeth
contact the central
fossae of the
maxillary teeth whilethe lingual cusps of
maxillary teeth fit the
central fossae of
mand. teeth.
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The buccal cusps of
maxillary teeth meet
the buccal cusps ofmandibular teeth.
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The alveolar ridge.
The vertical axis and occlusalplane.
The other teeth.
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Teeth are positioned on the alveolar ridgeanteroposteriorly and mediolaterally inorder to:
Provide stability.
Direct the masticatory forces to bewell supported by the ridge.
Support lips and cheeks for esthetics.
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In maxilla:
resorption pattern is vertically and facially;
maxilla becomes narrower.
In mandible:
resorption pattern is vertically and
lingually; mandible becomes wider.
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Incisive papillais a guide line to place
the max. central incisors.
The forcesthat retain the lower denture
in place are much less than those
retaining the upper denture.
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1. Arrangement of the theposterior teeth over the ridge.
2. Placement of the posterior
occlusal plane at half thevertical height of theretromolar pad or below the
level of the tongue.3. Arrangement of the upper and
lower teeth in the neutral zone.
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Placement of theposteriorocclusal plane athalf the verticalheight of the
Retromolar pador below thelevel of thetongue.
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A mandibular denture shaped to conform to the patients
neutral zone with reduced bucco-lingual width of the posterior
teeth
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Vertical axis:
a line passing straight thorough the
cast.The occlusal plane:
anteriorly; is parallel to interpupillaryline.
posteriorly; is parallel to ala-tragusline.
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The long axis; parallel orinclined distally whenviewed from the frontand inclined labiallywhen viewed from theside.Incisal edge; in contact
with the occlusal plane.
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The long axis;inclined distallywhen viewed fromthe front andinclined labiallywhen viewed fromthe side.
the neck isslightly depressed.
Incisal edge; to1 mm. above the
occlusal plane.
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The long axis; parallel orinclined distally when viewedfrom the front and verticalwhen viewed from the side.
The neck is prominent.Cusp tip; in contact with the
occlusal plane.The mesial plane should
follow the contour of ant.teeth while the distal planeshould be in line with the
post. teeth.
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Maxillary anterior
teeth are arranged
carefully in relationto properly
contoured occlusion
rim.
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The long axis: is parallel tothe vertical axiswhen viewedfrom the frontand the side.The buccal
cusp:is raised
nearly mmfrom the
occlusal plane.The palatal
cusp:touches the
occlusal plane.
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The long axis:
is parallel to thevertical axis whenviewed from thefront and theside.The buccal cusp:
touches the
occlusal plane.The palatal cusp:
touches theocclusal plane.
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The long axis:
is inclined slightlyto the mesial whenviewed from thefront.The mesiopalatal
cusp:
is the only touchingthe occlusal plane.
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The long axis:is inclinedslightly to themesial when
viewed from thefront.The cusps:
all four cusps
are short ofocclusal planebut themesiopalatal
cuso is the
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The long axis:
its long axis isparallel to the verticalaxis when viewed fromthe front and slopes
labially when viewedfrom the side.The incisal edge:
the incisal edge is 1mm above the occlusal
plane to establish verticaloverlap of the maxillaryanteriors.
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The long axis:
Its long axis is parallelor slightly inclinedmesially to the vertical
axis when viewed fromthe front and slopeslabially when viewedfrom the side.
The incisal edge:
the incisal edge is 1mm above the occlusalplane.
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The long axis:
Its long axis is slightlyinclined mesially to thevertical axis whenviewed from the frontand slopes slight
lingually when viewedfrom the side.
The incisal edge:
the incisal edge is 1 mmabove the occlusal plane
(the same occlusal planeas the central and lateralincisors).
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The relationship of the teeth to each
other
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Every tooth[except thelower centralincisor and theupper last
molar] occludewith two teeth.
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The six upper anterior
teeth overlap the six
lower anteriors by
about 1 mm .Vertical overlap is
called overbite.
Horizontal overlap is
called overjet.
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The buccal cusps of
upperposteriorteeth
overlap the lowerposteriors to prevent
cheek biting.
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The buccal surface ofthe first and secondpremolars should bearranged in straight linewith the labial surface
the canine.
The buccal surface ofthe molars should bearranged in another
straight line.
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Well processed and polished completedentures
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The lower jaw is
narrower than theupper jaw with a
receding chin
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Upper posterior teeth will need to be
set inside the ridge.
lower posterior teeth should never be
set outside the ridge.
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Upper anterior teeth will be set with a large overjet
similar to that exists in natural dentition with superior
protrusion.
Any attempt to tilt the upper anteriors backwards or the
lower anteriors forwards will give the patient a rabbity
appearance and destabilize the lower denture.
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The lower ridge is broader
than the upper with
aprotrusive chin.
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Cross bite is made by setting the buccal cusps
of the lower molars to fit into the fossa of the
upper molars.
Upper max. teeth may be set outside the ridge.
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In some patients with overdeveloped maxillary
incisor region, the six upper anterior teeth arefitted directly onto the alveolar ridge without
labial flange (openfaceddenture).
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THANKTHANK