struktur anatomi dan myofungsional sistem mastikasi

7/25/2019 struktur anatomi dan myofungsional sistem mastikasi

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Oleh : Sekar Pratiwi

Pembimbing : Iwan Ahmad, drg., Sp.KGA

FUNCTIONAL ANATOMY OFMASTICATORY SYSTEM

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THE MASTICATORY SYSTEM

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A dynamic biomechanical musculoskeletal system


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Dentitions

Periodontal supporting tissues

Maxilla and Mandible

Temporomandibular Joint

Mandibular musculature

Muscles of lips, cheeks, and tongue

n!ol!ing soft tissue

Suppl"ing inner!ation and !asculation

COMPONENTS OF THE

MASTICATION

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Maxillar" teeth

PRIMARY DENTITION

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Mandibular teeth

Months 8 10 13 16 19 27 29

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2 4 3 51

2 4 3 5


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PERMANENT

DENTITION

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Maxillary teeth

Mandibular teeth

Years 6 8 10

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2 43 56

2 4 35

12 20

7

1

1

7 8

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o #arl" loss of deciduous teeth without spaceretaining appliances

o $oss of mandibular %rst molar

Mn!"a"#an $

lingual and mesial tipping of mandibular 2ndand 3rd molar

Loss vertical dimension

Changing in masticatory habit and muscletonicity

LOSS OF TEETHCAUSES

OCCLUSALDISHARMONY

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&ementum

Periodontal ligament

Supporting bone

'suall", periodontium is protected

against in(ur" b" neuromuscularre)exes

PERIODONTALSUPPORTING

TISSUES

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Periodontal trauma

Pattern of mastication

$oss of teeth

$oss of periodontal support

*ault" restoration

+bnormal occlusal forcebruxism, clenching

PRO%LEMS TO

PERIODONTIUM

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TEMPOROMANDI%ULAR

&OINT 'TM&(

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A complex giniglymoarthrodial (hinge and glide)

articulation with limited capability of

diarthrosis (free movement)


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TM& IN SAGITAL )IE*

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TM& IN ANTERIOR )IE*

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A, $ateral !iew- %, Diagramshowing the anatomiccomponents-

ACL, +nterior capsular

ligament .collagenous/ AS, articular surface

IC, inferior (oint ca!it"

ILP, inferior lateral pter"goidmuscles

IRL, inferior retrodiscal lamina.collagenous/

RT, retrodiscal tissues

SC, superior (oint ca!it"

SLP, superior lateral pter"goidmuscles

SRL, superior retrodiscallamina elastic -

LATERAL )IE* OFMANDI%ULAR COMPONENTS

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&onsist of

internal synovial layer

outer fibrous layer containing veins,

nerves, and collagen fibres.

nner!ation of capsule diskarises from &0 1auriculotemporal and massetericner!es

1enous plexus at posterioraspect

ARTICULAR CAPSULE

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S"no!ial cell and connecti!e tissue co!ering the

lower and upper2(oint spaces

S"no!ial )uid, a proteogl"can2h"aluronic acid

complex acts as a lubricant and ma" participated in

nutritional and metabolic interchange for central

part-

SYNO)IAL TISSUE

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3iconca!e o!al structureinterposed between thecond"le and the temporal

bone

4 mm in the middle and 526mm at peripher"

Dense collagenousconnecti!e tissue

&entre area is a !ascular,h"aine and de!oid of ner!e

ARTICULAR DISK

'MENISCUS(

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Temporomandibular

ligament

extend from base of zygomatic processof the temporal bone downward and

oblique to the neck of the condyle

LIGAMENTS

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St"lomandibular ligament

From styloid process and runs

downward and forward to attach

broadly on the inner aspect of the

angle of mandible

LIGAMENTS

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Sphenomandibular

ligament

arising from the angular spine of

sphenoid bone and petrotympanic

fissure, ending at lingula of mandible

LIGAMENTS

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+ccessor" ligaments ma" limit border mo!ements of

the mandible

*ibrous capsule and TM ligament ma" limit of

extreme lateral mo!ements in wide opening of

mandible

FUNCTIONS OF

LIGAMENTS

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Masseter muscle

Temporalis muscle

Medial pter"goid muscle

$ateral pter"goid muscle

MASTICATORY

MUSCLES

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.4/ The super!ial portion consists of %bers that run downwardand slightl" backward

.5/ the deep portion consists of %bersthat run in a predominantl"!ertical direction-

MASSETER MUSCLE

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6 bundles

Anterior bundle (vertical fibre

Action! "andible elevator (#lose $aws, crushing and chewing at #.%.

&naction! "andible depression (except "ax. %pening and %pening against resistance

TEMPORALISMUSCLE

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Posterior bundle (Horizontal bundle)

Action! "and. retraction and positioner

&naction! "and. depression and protrusion

Intermediate bundle

Action! 'rotrisive movement

TEMPORALIS

MUSCLE

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LAT. PTERYGOID

MUSCLE

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A, Medial pter"goid muscle- %, *unction: ele!ation of themandible-


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LAT. PTERYGOID

MUSCLE

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A, nferior and superior lateral pter"goid muscles- %, *unctionof the inferior lateral pter"goid: protrusion of the mandible-


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MANDI%ULAR MO)EMENTS

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THANK YOU

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struktur anatomi dan myofungsional sistem mastikasi

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