arrangement of teeth

7/29/2019 arrangement of teeth

1/65

ArrangementArrangement ofofteethteethArrangementArrangement ofofteethteeth

ByBy

Dr. IBRAHIM RAMADAN ELTORKYDr. IBRAHIM RAMADAN ELTORKYAss. Professor of Prosthodontics

Faculty of Dentistry

Tanta University


2/65


3/65

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.


4/65

Occlusion rim is

used as a guidefor arrangementof artificial teeth


5/65

Physiologically.

must be compatible with lips, cheeks andtongue.Esthetically.

must be correctly positioned.


6/65

Anterior teeth:

Three important factors must be considered;

1. Esthetics.

2. Phonetics.

3. Incision.


7/65

Correct position of

max. Anterior

teeth to satisfy:

1. Esthetic.

2. Phonetics.

3. Incision.


8/65

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.


9/65

The palatal cusps of upper posteriorteeth are positioned parallel to and

directly over the lower ridge crest.


10/65


11/65

The palatal cusps of upper posterior teeth arepositioned parallel to and directly over the lowerridge crest.


12/65

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.


13/65

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.


14/65

Are artificial curves

introduced into

dentures in order to

facilitate the

production of

balanced occlusion.

Artificial counterparts

ofcurve of Monsonand curve of Spee.


15/65

The occlusal surfaces of upper right andleft posterior teeth must be on the same

horizontal plane or level.


16/65

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.


17/65


18/65

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.


19/65

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.


20/65

The buccal cusps of

maxillary teeth meet

the buccal cusps ofmandibular teeth.


21/65

The alveolar ridge.

The vertical axis and occlusalplane.

The other teeth.


22/65

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.


23/65

In maxilla:

resorption pattern is vertically and facially;

maxilla becomes narrower.

In mandible:

resorption pattern is vertically and

lingually; mandible becomes wider.


24/65


25/65

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.


26/65

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.


27/65

Placement of theposteriorocclusal plane athalf the verticalheight of the

Retromolar pador below thelevel of thetongue.


28/65

A mandibular denture shaped to conform to the patients

neutral zone with reduced bucco-lingual width of the posterior

teeth


29/65

Vertical axis:

a line passing straight thorough the

cast.The occlusal plane:

anteriorly; is parallel to interpupillaryline.

posteriorly; is parallel to ala-tragusline.


30/65


31/65


32/65

The long axis; parallel orinclined distally whenviewed from the frontand inclined labiallywhen viewed from theside.Incisal edge; in contact

with the occlusal plane.


33/65


34/65

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.


35/65


36/65

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.


37/65


38/65

Maxillary anterior

teeth are arranged

carefully in relationto properly

contoured occlusion

rim.


39/65


40/65

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.


41/65

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.


42/65

The long axis:

is inclined slightlyto the mesial whenviewed from thefront.The mesiopalatal

cusp:

is the only touchingthe occlusal plane.


43/65

The long axis:is inclinedslightly to themesial when

viewed from thefront.The cusps:

all four cusps

are short ofocclusal planebut themesiopalatal

cuso is the


44/65

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.


45/65

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.


46/65

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).


47/65


48/65

The relationship of the teeth to each

other


49/65

Every tooth[except thelower centralincisor and theupper last

molar] occludewith two teeth.


50/65

The six upper anterior

teeth overlap the six

lower anteriors by

about 1 mm .Vertical overlap is

called overbite.

Horizontal overlap is

called overjet.


51/65

The buccal cusps of

upperposteriorteeth

overlap the lowerposteriors to prevent

cheek biting.


52/65

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.


53/65

Well processed and polished completedentures


54/65


55/65


56/65


57/65

The lower jaw is

narrower than theupper jaw with a

receding chin


58/65

Upper posterior teeth will need to be

set inside the ridge.

lower posterior teeth should never be

set outside the ridge.


59/65

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.


60/65

The lower ridge is broader

than the upper with

aprotrusive chin.


61/65

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.


62/65


63/65

In some patients with overdeveloped maxillary

incisor region, the six upper anterior teeth arefitted directly onto the alveolar ridge without

labial flange (openfaceddenture).


64/65


65/65

THANKTHANK

arrangement of teeth

Documents