ANATOMY AND PHYSIOLOGY IN RELATION TO ... 2...TO COMPLETE DENTURE CONSTRUCTION DENTURE BEARING AREAS DENTURE LIMITING STRUCTURES DR MOSTAFA ELSAYED SEM 1 19/3/20 1 . Loss of teeth

ANATOMY AND PHYSIOLOGY IN RELATION

TO COMPLETE DENTURE CONSTRUCTION

DENTURE BEARING AREAS

DENTURE LIMITING STRUCTURES

DR MOSTAFA ELSAYED

SEM 1

19/3/20

1 . Loss of teeth .

2 . Resorption of the alveolar bone .

3 . The mandible become closer to the nose .

4 . Lack of support to the facial muscles .

Changes That Happen After Teeth Loss :

The mandible become closer to the nose .

Frontal and b, profile views of patient demonstrating

overclosure and collapse of nasolabial features due to VDO

that is reduced.

Lack of support to the facial muscles .

Ridges


Ridges


Anatomical Landmarks In Relation To Complete Denture :

Modulus

Labiomental sulcus

Extra Oral Landmarks

Naso – Labial sulcus

Filtrum

Extra-oral landmarks

Inter pupillary line Ala Tragus Line

Inter pupillary line

Ala Tragus Line

Naso – Labial sulcus

Modulus

Labiomental sulcus

Anterior Occlusal Plane Determination

Classes of jaw relations

Becomes deeper with age and with loss of teeth

Posterior Occlusal Plane Determination

Become Flat With The Loss Of Teeth

Labiomental sulcus

Classes of jaw relations

Denture Bearing areas / Upper Incisive Papilla

Incisive Papilla

1 . The incisive papilla is a thick part of the

mucous membrane covering the incisive

foramen.

2 . It is located at the anterior end of the

median palatine raphae .

Intra Oral Landmarks

3 . The nasopalatine nerves and vessels

pass through the incisive foramen

to supply the anterior 2 / 3 of the palate.

4 . In some cases due to the excessive

bone resorption, the papilla may lie

on the crest of the ridge.

5 . The incisive papilla should be

relieved to avoid pressure on the

incisive nerves and vessels.

Denture Bearing areas / Upper

Raugae Area

Palatine Rugae

1 . It is an irregularly shaped elevations of soft tissue

extending

laterally from the midline in the anterior part of the hard

palate.

2 . It serves as one of stress bearing areas in the palate .


Median Palatine Raphae

Median Palatine Raphae

1 . The midline of the hard palate is covered by a thin layer of

mucoperiostium , that covers the median palatine suture .

2 . That suture joins the right and the left halves of the hard palate.

3 . It is usually relieved to increase denture stability by preventing its

rocking .


Fovia Palatina

Fovia Palatina

1 . It helps in the determination of the posterior border

of the upper denture.

2 . The posterior border of the upper denture should be

2 mm posterior to the fovea Palatina .

Residual Alveolar Ridge

To Continue ( Bearing Areas)

Residual Alveolar Ridge

1 . It should be firm specially in the lower ridge .

2 . It covers the crest of the lower ridge.

3 . Its mobility may cause pressure symptoms under

the lower denture.

4 . Also can affect denture stability .


Buttress Part Of Bone

Buttress Part Of Bone

1 . It is formed of the lower portion of the zygomatic

process of the maxilla (the area above the first molar

teeth) .

2 . It provides excellent resistance to the vertical

forces(Support).


Tubirosity

Tubirosity

1 . It is important for retention and support of the

upper denture against lateral movement.

2 . The denture should cover it , because it is one of

stress bearing areas in the upper aw .

Immovable Part of Soft Palate


Immovable Part of Soft Palate

1 . The immovable part lies adjacent to the hard

palate and the movable part lies more posterior.

2 . The posterior edge of the upper denture should

end at the junction of these two parts .

Labial Frenum

Denture Limiting Structures (Upper)

Labial Frenum

It must be relieved in the denture by making a

V-shape notch in the labial flange opposite to

its position .

Labial Vestibule


Labial Vestibule

1 . It Is the reflection of the mucosa of the lip to the

mucosa of the alveolar process in the labial

vestibule.

2 . The denture in this area is in relation to the

orbicularis oris and the superior incisive muscles .

3 . These muscles limit the thickness and the length

of the labial flange of the denture.

Buccal Frenum


Buccal Frenum

1 . It is a fold of mucous membrane (tendon of the

buccinator muscle) varies in size in number and in

position

2 . A notch is made in the denture flange opposite to its

position to facilitate its functional movements.

Buccal notch

Buccal Vestibule


Buccal Vestibule

1 . The denture in this area is related to buccinator muscle.

2 . Buccal flanges must extend in the buccal vestibule .

3 . Due to the horizontal direction of the fibers of this muscle;

the contraction of this muscle will not displace the denture.


Hamular Notch

Hamular Notch

1 . It is one of the important landmarks for

determination of the posterior limit of the upper denture

2 . A straight line from hamular notch on one side to the

other on the other side determines the posterior limit of

the upper denture

Vibrating Line

( Ah Line)


Vibrating Line

( Ah Line)

1 . It separate the movable part from the immovable part

of the soft palate.

2 . This line is 2mm posterior to the fovea palatine .

3 . This line determines the posterior end of the upper

denture.

Retro Molar Bad

Denture Bearing and Limiting Structures (Lower)

Retro Molar Bad

1 . It is a pear shaped area of mucous membrane

at the posterior end of the mandibular ridge and

anterior to the pterygomandibular raphae .

2 . It consists of mucous glands, temporal tendon

, fibers of the buccinators and superior

constrictor muscle .

3 . Lower denture should cover this area for

retention and to cover the buccal shelf of

bone (Primary stress bearing area) .

Buccal Shelf

Of Bone


Buccal Shelf Of Bone

1 . The area that lies between the crest of the residual ridge

and the external oblique ridge.

2 . It is the primary stress bearing area in the lower arch .

3 . It forms good support for the lower denture .

Buccal Vestibule


Buccal Vestibule

1 . The denture in this area is related to the buccinator

muscle .

2 . Its contraction does not displace the lower denture so

flanges of the lower denture must extend in the buccal

vestibule.

Buccal Frenum


1 . It is a fold of mucous membrane in the

premolar area, movement of the lip and the

cheek move the frenum .

2 . A notch is made in the lower denture to

accommodate the frenum.

Buccal Frenum

Labial Vestibule

Labial Frenum


Labial Frenum

Labial Vestibule

Residual Ridge


Residual Ridge

Lingual Pouch


More posteriorly the lingual flanges are related to the lingual

pouch with its boundaries which are :

Posteriorly : The palatoglosssus muscle .

Anteriorly : The Mylohyoid muscle.

Medially : The tongue .

Laterally : The medial aspect of the mandible.

Lingual Pouch

Sublingual salivary

gland area


Sublingual salivary

gland area

The lingual flanges of the lower denture should not

extend in this area ,because with excessive resorption

of the mandible the gland may bulge superiorly above

the body of the mandible.

Lingual Frenum


Lingual Frenum

1 . More anteriorly a fold of mucous membrane attach

the mucosa of the tongue to mucosa of the floor of

the mouth

2 . It moves with the movement of the tongue so a notch

is made to accommodate the frenum.

Genial tubercles


Genial tubercles

1 . 4 Bony projections attached to genio-glosses and

genio-hyoid muscles

2 . They should be releived when covered by lower

denture

Documents

ANATOMY AND PHYSIOLOGY IN RELATION TO ... 2...TO COMPLETE DENTURE CONSTRUCTION DENTURE BEARING AREAS DENTURE LIMITING STRUCTURES DR MOSTAFA ELSAYED SEM 1 19/3/20 1 . Loss of teeth