ANCHORAGE

ANCHORAGE: 

ANCHORAGE Syeda tooba zaidi Deptt of orthodontics.

Slide 2: 

There is equal and opposite Reaction to every action. Newton’s third law

CONCEPTS OF ANCHORAGE: 

CONCEPTS OF ANCHORAGE Anchorage is the word used in orthodontics to mean resistance to displacement. Every orthodontic appliance consist of two element. 1 active 2 resistance

Slide 4: 

Active part Concerned with tooth movement. Resistance element. Provide resistence (anchorage) that makes the tooths movements possible.

CLASSIFICATION OF ANCHORAGE according to Moyers: 

CLASSIFICATION OF ANCHORAGE according to Moyers

CLASSIFICATION OF ANCHORAGE according to Moyers: 

CLASSIFICATION OF ANCHORAGE according to Moyers

CLASSIFICATION OF ANCHORAGE according to Moyers: 

CLASSIFICATION OF ANCHORAGE according to Moyers

CLASSIFICATION OF ANCHORAGE according to Moyers: 

CLASSIFICATION OF ANCHORAGE according to Moyers

OUTLINE OF KINDS OF ANCHORAGE: 

OUTLINE OF KINDS OF ANCHORAGE

OUTLINE OF KINDS OF ANCHORAGE: 

OUTLINE OF KINDS OF ANCHORAGE

INTRAORAL ANCHORAGE: 

INTRAORAL ANCHORAGE TEETH ALVEOLAR BONE BASAL BONE MUSCLES

Teeth : 

Teeth When one teeth moves the other can act as Anchorage units. It depends on. Root form. Root size. No of roots. Root length. Root inclination. Ankylosed teeth.

Slide 13: 

2. ALVEOLAR BONE: The alveolar bone that surrounds a tooth offers resistance to tooth movement up to a certain amount of force. When the forced applied exceeds a certain limit, the alveolar bone permits tooth movement by bone remodling . 3. BASAL BONE: Certain areas of the basal jawbones are available as sources of anchorage. These include hard palate ang the lingual surface of mandible in the region of the roots MUSCULATURE: The normal tonus of the facial and masticatory muscles plays an important role in the normal development of dental arches. Abnormal hypotonic musculature causes flaring and spacing of teeth while hypertonic muscles exert restrictive forces in a lingual direction.

ACCORDING TO THE MANNER OF FORCE APPLICATION: 

ACCORDING TO THE MANNER OF FORCE APPLICATION

SIMPLE ANCHORAGE: 

SIMPLE ANCHORAGE

Slide 16: 

Displacement of anchor teeth can be Minimized by arranging the force system so That anchor teeth must move bodily if they Move at all , while movement teeth allow To tip. E.g of retracting incisor by tipping them posteriorly STATIONARY ANCHORAGE Reciprocal tooth movement is produced when Two teeth or resistance units of equal size pull Against each other. E. g of a closure of a midline diestema . RECIPROCAL ANCHORAGE

Slide 17: 

Finger springs used to closed midline diestema . B. correction of midline diestema using Elastics. C. cross bite elastics for correction of single tooth posterior cross bite. D. arch Expansion using removable appliance incorprating a coffin spring. RECIPROCAL ANCHORAGE

ACCORDING TO JAWS INVOLVED: 

ACCORDING TO JAWS INVOLVED

INTRAMAXILLARY: 

INTRAMAXILLARY

INTERMAXILLARY ANCHORAGE: 

INTERMAXILLARY ANCHORAGE Elastic intermaxillary traction is difficult with removable appliances and is exclusivly employed In fixed appliance treatment. Resistance unit Situated in one Jaw are used to Effect tooth Movement in the Opposing jaw. Class ll elastic Traction. b. Class lll elastic Traction. A B

ACCORDING TO THE SITE OF ANCHORAGE: 

ACCORDING TO THE SITE OF ANCHORAGE INTRA-ORAL Anchorage establish within the Mouth ,that is, utilizing the teeth, Mucosa or other intra-oral structures. MUSCULAR. Anchorage derived from action of Muscles e.g vestibular shields.

Slide 22: 

MUSCULAR ANCHORAGE Force generated by muscle to aid Movement of teeth. Eg LIP BUMPER to distalize molar

EXTRA ORAL ANCHORAGE: 

EXTRA ORAL ANCHORAGE A occipital head gear .anchorage from cranium. b. Face mask for the protraction of maxilla- anchorage from forehead and chin.

CERVICAL PULL HEADGEAR: 

CERVICAL PULL HEADGEAR

HIGH PULL HEADGEAR: 

HIGH PULL HEADGEAR

Slide 26: 

Note the snap away safety mechanism. (b) An occipital (high pull) headgear again with a snap away safety system. (c) A variable pull Interlandii headgear. A rigid plastic strip is employed as a safety mechanism to prevent the facebow disengaging from the molar bands and coming out of the mouth. ( d,e ) The end of the facebow can be re-curved to improve safety. ( f,g ) A plastic coated facebow together with a safety neck-strap. ( h,i ) A Samuels locking spring. This secures the face bow to the tube preventing accidental disengagement. This should be used in conjunction with a safety neck strap or snap away headgear. ( f,g ) A plastic coated facebow together with a safety neck-strap

ACCORDING TO NO OF ANCHORAGE UNITS: 

ACCORDING TO NO OF ANCHORAGE UNITS Intermaxillary Simple Anchorage

Slide 28: 

Simple anchorage Compound anchorage

REINFORCED ANCHORAGE: 

REINFORCED ANCHORAGE Connect contraletral Molars either Across the vault Of the palate or around the lingual aspect of The lower arch will help to prevent movement of the molars. The arches are usually attached to bands Cemented to molar teeth. Upper ant inclined plane Sved appliance Intramaxillary anchorage

CHOICE OF APPLIANCE: 

CHOICE OF APPLIANCE Upper removable appliances actually afford more anchorage than fixed appliances because of there palatal coverage.

IMPLANTS: 

IMPLANTS Implants act as fixed structure and are useful for providing anchorage in pt with HYPODONTIA or MARKED TOOTH LOSS. If there are edentulous spaces to be restored using tooth bearing implants( and if the spaces are in correct position), then this can be done prior to orthodontic treatment and brackets can be attached to the implants.

IMPLANTS: 

IMPLANTS Other type of plants have also been used for orthodontic anchorage, including MICRO-IMPLANTS. MINI PLATES. PALATAL IMPLANTS.

What is anchorage loss?: 

What is anchorage loss? A certain amount of unwanted movement of the anchor teeth invariably occurs during orthodontic treatment. Such unwanted movement of anchor teeth called ANCHORAGE LOSS. Three types. Maximum Moderate. Minimum

Slide 38: 

A. Maximum : 1/4 th of the extraction space should be lost by forward monement . B. Moderate : anchor teeth permitted to more 1/4 th to ½. C. More than half of the extraction space can be lost by teeth moving mesially .

KEY POINT : 

KEY POINT Anchorage is the resistance to unwanted tooth movements. Anchorage demands need to be assessed at the outset as an essential component of treatment planning or the desired result may be achieved. Anchorage can be increased by maximizing the number of teeth in the anchor unit either intraorally , extraorally or by the use of implants.

Slide 40: 

Thank you