Topic 2: Setting up the teeth

★ Preservation of the alveolar bone

★ Esthetics

★ Masticatory Efficiency

★ Retention and Stability during Function

★ Health & Comfort of the TMJ

AIMS OF SETTING

true

true or false

The upper teeth should overlap the lower teeth

true or false

The long axis of each upper tooth should be distal to the long axis of the corresponding lower tooth

true

true or false

Each tooth except the lower central incisors and the

upper last molars should be opposed by two teeth

Set the teeth where they grew

PAYNE stated “____”

Anteroposterior Position

distance from papilla, relation to residual ridge, fullness of the lips ( l i p su p port ) , phonetics F & V

show of teeth, modiolus (lower canine and premolar)

Mediolateral Position

midline, ala of the nose

Inclination of slant

labial plate & facial profile

true or false

Both upper & lower posterior teeth are centered over the crest of the ridge whenever possible to improve balance and stability of the denture

Guides to Positioning of Posterior Teeth

POUNDS TRIANGLE

where you should set your posterior teeth

Class 1

Overjet 2-4mm

Class 1

Overbite ( 1mm excessive overbite avoided)

class 1- First Molar Relation

( Mb cusp of upper opposes buccal groove of lower)

Lingual

Functional of Upper:

Buccal

Functional of Lower:

Class 2

Pronounced overjet

Class 2- Lower canine

____more posterior and lingual

Class 2- Lower premolar

_____maybe ground mesiodistally or removed

Class 2

Nonanatomic teeth or teeth with shallow inclines are selected to reduce stresses on the lower

Class 2

are flattened to stabilized centric occlusion

class 2

Molars maintained cusps to fossae relation

Class 3

Overjet overbite eliminated

Class 3

Incisors can be set edge to edge

Class 3

Upper anteriors set are far forward for lip supports

and esthetics; lowers as far lingual without tongue

interference

class 3

Upper premolar maybe removed or add lower teeth

( pr emol ar or mol ar )

class 3

Molars maybe set in crossbite

Class 3

Buccolingual inclines & transverse ridges of

posteriors are flattened

Cross over point

the point at which the teeth change from one

relationship to another

CROSS-OVER POINT

the crossover point could be at the 2nd premolar

CROSS-OVER POINT

teeth may be set in an end-on or cusp to cusp

relation

TWICE

Trial Fitting in Clinics, done ___

1. Esthetics

2. Retention

3. Phonetics

Role of Polished Surface (ERPEH)

Esthetics

imitate the form of the tissues around the teeth

Retention

form of denture base be shaped according the muscles and tissues ( l i ps , ch eek s ,

t on g ue )

Phonetics

contour comparable to that of the palate

Waxing

Defined as the contouring of the wax base of a trial denture into the desired form

Festooning

The procedure of carving the denture base to

stimulate the contour of the natural tissues which

are being replaced by the denture

1. Cervical cut

2. Placement of triangular markings

3. root indications

PROCEDURES IN FESTOONING

Cervical cut

• cut wax back to the cervical line on the artificial teeth, or a little beyond to stimulate gingival recession

• sharp instrument is HELD at a 45 degrees angle to the tooth surface

Placement of Triangular Markings

guide to the length and position of the root indications

Root Indications

wax is scraped out of the triangular markings, to which the

root indications will manifest

Palatal surface

It has a uniform thickness of 2.5 mm