PENJANGKARAN.pptx

8/10/2019 PENJANGKARAN.pptx

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PENJANGKARANYenny Yustisia

Bag. Ortodonsia FKG Unej


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Introduction

Orthodontic tooth movement

Force

Active components???


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Introduction

Active components

Generate forces

In one directionEqual and opposite force

Newtons third law of motion


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DEFINITION

Moyers : Resistance to displacement. Active elements and resistance elements.

Anchorage in orthodontics as the nature and degreeof resistance to displacement offered by an anatomicunit for the purpose of tooth movement. (GRABER)

Anchorage is the site of delivery from which force isexerted(White and Gardnier)

Newtonsthird law: for every action, there is reaction

Action = reaction


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CLASSIFICATION(MOYERS)

According To Manner Of Force Application

Simple, Stationary, Reciprocal

According To Jaws Involved

Inter Maxillary, Intra Maxillary


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According To Site

Intra 0ral: Teeth,alveolar Bone,basal Bone

Exraoral: Cervical,occipital,cranial,facial

Muscular

According To Number Of Anchorage Units

Single Or Primary,compound,multiple OrReinforced


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Classification

Nanda :1.A anchorage: critical / severe

75 % or more of the extraction space isneeded for anterior retraction

.2. B anchorage: moderate

Relatively symmetric space closure (50%)

3. C anchorage: mild / non critical75% or more of space closure by mesial

movement of posterior teeth


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Classification


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Classification

Burstone

Group A:Postr teeth contribute less than one

quarter to total space closure

Group B:Postr teeth contribute from onequarter to one half to total space closure

Group C:Postr teeth contribute more than onehalf to total space closure


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INTRA ORAL ANCHORAGES

teeth

alveolar bone

basal bone

musculature


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ROOT FORM

Flat

Resist Movements In Mesio-distal Direction,but LittleResistance Buccolingually

Eg; Mandibular Incisors And Molars,buccal Root Of

Maxillary Molars

Round

Resist Horizontally Directed Force In Any Direction

Eg; Bicuspid,palatal Root Of Upper Molars

Triangular

Maximum Anchorage

Eg; Cuspids,maxillary Centrals And Laterals


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SIZE AND NUMBER OF

ROOTS

Multirooted Teeth

Having The Maximum Size Have Max. Anchorage

Root Length

Directly Propotional To Anchorage

Axial Inclination

Anchorage Is More When Force Exerted Is

Opposite To That Of Axis Of Inclination Of TeethAnkylosed Teeth

No Pdl, So No Movement-excellent Anchorage


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BASAL BONE

Certain Areas Act As Resistance Areas-

provide Good Anchorage-

Hard Palate,lingual Surface Of Mandible


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MUSCULATURE

Hypertonic Labial Musculature Used For

Anchorage In Lip Bumper


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EXTRA ORAL

Cranium Occipital Or Parietal Anchorage:-anchorage Obtained From

Occpital Or Parietal Bone

Eg:-head Gear To Restrict Maxillary Growth

Cervical Anchorage From Cervical Or Neck Region

Eg:-cervical Head Gear

Facial Bones Face Mask Used To Protract Maxilla Take Anchorage From

Mandibular Symphysis

Reverse Head Gears Take Anchorage From For Head And Chin


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SIMPLE ANCHORAGE

Simple Anchorage:

Dental anchorage in which the manner and

application of force tends to displace or

change the axial inc l inat ionof the teeth thatform the anchorage unit in the plane of space

in which the force is being applied.


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STATIONARY ANCHORAGE

Dental anchorage in which the mannerand application of force tends to displacethe anchorage unit bodi lyin the plane of

space in which the force is being applied. Refers to the advantage that can be

obtained by pitting bodily movement ofone group of teeth against tipping ofanother


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Eg: Retraction of mandibular incisors using first

molars as anchorage

Considerably more than Simple Anchorage


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RECIPROCAL ANCHORAGE

Resistance Offered By Two Malposed Units

When The Application Of Two Equal And

Opposite Forces Tend To Move Each Unit To A

More Normal Position Eg:-closure Of Midline Diastema

Cross Bite Elastics,expansion Appliances

INTRA MAXILLARY


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INTRA MAXILLARY

ANCHORAGE

Teeth Are To Be Moved And The Anchorage

Units Are In The Same Arch

INTER MAXILLARY


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INTER MAXILLARY

ANCHORAGE

Teeth Are To Be Moved In One Arch And

Resistrance Units Are In Opposite Arch

Eg:-class II ,Class III Elastics


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COMPOUND ANCHORAGE

Anchorage Provided By More Than One Teeth

With Great Support To Move Tooth With Less

Support


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REINFORCED ANCHORAGE

More Than One Type Of Resistance Unit Is

Utilized

To Augment The Intra Oral Anchorage, Extra Oral

Anchorages Trans Palatal Arch,and LingualArches Is Used

Upper Anterior Inclined Plane Used For Forward

Movement Of Mandible Uses Muscular

Anchorages


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According To Implant Placement

Self Tapping Method

Implant Tapped In To A Previously Drilled Hole-smaller

Diameter Implants Self Drilling Method

Implant Is Itself Drilled In To The Bone-larger Diameter

Implant


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According To The Path Of Insertion:-

Oblique

30=60degrees To Long Axis Of Teeth-where Inter

Radicular Bone Is Narrow Perpendicular

Inserted Perpendicular To The Bone Surface-when

Sufficient Inter Radicular Bone Present


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ANCHORAGE PLANNING AFFECTING

FACTORS ARE

Number Of Teeth Being Moved To Move Greater Number Of Teeth, Anchorage Should Be

More

Type Of Teeth:

Teeth Having More Surface Area Require More Anchorage Type Of Movement

Bodily Movement Require More Anchorage

Duration Prolonged Treatments Require Good Anchorage

Skeletal Growth Pattern Vertical-require More Anchorage Due To Poor Tonicity Of

Facial Muscles

Horizontal-vice Versa


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Loss of anchorage

the unplanned and unexpected movement of

the anchor teeth during orthodontic treatment

Poor appliance design

Poor appliance adjustment Poor patient wear


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Poor appliance design

Failure to adequately retain the appliance, or

incorporate as many teeth into the anchor

block as possible

Removable appliances should have adequateretention using appropriate well-adjusted cribs or

clasps with as much contact with the teeth and

oral mucosa as possible

fixed appliances are used, as many anchor teethas possible should be banded in order to produce

optimum anchorage


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Based On The Anchorage Loss, The

Anchorage Demand Of The Extraction Cases

Are Of Three Types

Maximum,moderate,minimum


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Maximum Anchorage Cases

Anchorage Demand Is Very High

Not More Than 1/4 Th Of The Extraction Place

Should Be Lost By Anchorage Loss So Augmentation Of Anchor Teeth Required


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Thank you..

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