Anchorage presentation

Anchorage: 

Anchorage “The resistance to unwanted tooth movement” The more teeth that are incorporated into an anchorage block, the more likely it is that desirable tooth movements will occur. Understanding each patient’s anchorage requirements is of paramount importance and ensures high-quality care. Unexpected or unintended anchorage loss frequently results in a compromised finish.

Sources of ancHorage: 

Sources of ancHorage Anchorage may be derived from 4 sources Teeth Oral mucosa + underlying bone Implants Exta -oral

TEETH : 

TEETH Intra maxillary anchorage When all the units offering are situated within the same jaw the anchorage is describe as intramaxillary Eg . Use of intramaxillary intraoral appliances for molar distalization in Class II malocclusion. The forces applied can involve friction, as with the use of nickel-titanium ( NiTi ) coil springs,or they can be friction free, as when the pendulum appliance, closing loops are used. Pendulum, distal jet: Simultaneous distal crown and tipping movements contribute to molar distalization . Anchorage loss is observed through premolar mesial movement and incisor mesial crown and tipping movements.

PowerPoint Presentation: 

Intermaxillary anchorage Anchorage in which resistance unit situated in one jaw are used to effect tooth movement in the opposing jaw is intermaxillary anchorage Teeth in the opposite arch can provide very useful + important sites of anchorage control Class 11 traction elastic applied between lower molar n upper anteriors Class 111 traction elastic applied between upper molar n lower anteriors

Intramaxillary,intermaxillary anchorage: 

Intramaxillary,intermaxillary anchorage

  ORAL MUCOSA + UNDERLYING BONE: 

ORAL MUCOSA + UNDERLYING BONE Contact between the appliance and the labial/lingual mucosa can increase anchorage considerably for either fixed/removable appliances E.G : transplatal arch

Transplatal arch: 

Transplatal arch A transpalatal arch is a wire that fits along the roof of your mouth and is attached on both sides to bands on the molar teeth change/stabilize the position of the max molars in 3D,ie molar rotation/ uprighting , stabilizing transverse dimension, maintain leeway space during the transition of the dentition, buccal root torque

  Implants : 

Implant s The use of skeletal anchorage has become a new orthodontic tx strategy.(Park 04, 05) It doesn’t only changed how far teeth can be moved, but also offered more tx options to patients. Camouflages cases can be achieved without surgery by skeletal anchorage E.g Dental implants, miniplates , microscrews

implant: 

implant

microscrew: 

microscrew

Success of mia: 

Success of mia It depends on proper initial mechanical stability and loading quality and quantity. (Chen 09) The prepared site should have a cortical bone thickness of at least 1.0 mm, and the placement torque should be controlled up to 10 Ncm ( Motoyoshi 07)

Extra oral: 

Extra oral Can be used in conjunction with removable/fixed applian ces Headgear: Applied to the teeth via a facebo w A number of variations: cervical, occipital, variable, reverse

headgear: 

headgear Cervical HG Applied via an elastic strap/spring which runs round the neck Extrude the upper molars+tip them back distally because of the downward and backward direction of force Class II division 1 malocclusion may be treated to a Class I molar relationship by cervical headgear

Cervical headgear: 

Cervical headgear

PowerPoint Presentation: 

Occiptal HP-HG Less distal movement than with cervical HG Tipping and extrusion depends on the length/heights of the outer bow Variable Applied a force between cervical and occipital HG Preferred choice Reverse Mesial movement of the teeth, to close space or help to correct a reverse OJ Employs I/O hooks to which elastics are

Occipital,variable,reverse headgear: 

Occipital,variable,reverse headgear

Disadvantages of headgear: 

Disadvantages of headgear Safety, with facial+serious eye injury reported Clinical time Complaince

Situations of anchorage: 

Situations of anchorage Reciprocal Anchorage Reinforced Anchorage Stationary Anchorage Cortical Anchorage

PowerPoint Presentation: 

RECIPROCAL ANCHORAGE In reciprocal situation the forces applied to teeth n arch segment are equal REINFORCED ANCHORAGE The extent to which anchorage should be reinforced by adding teeth to the anchorage unit STATIONARY ANCHORAGE Stationary anchorage achieve by pitting bodily movement of one group of teeth against tipping of another CORTICAL ANCHORAGE Cortical bone is more resistance to resorption . Torquing roots of posterior teeth outward against the cortical plate as a way to inhibit their mesial movement when extraction spaces are to be closed

anchorage loss: 

anchorage loss The unplanned and unexpected movement of the anchor teeth during orthodontic treatment. Several causes of loss of anchorage: Poor appliance design Poor appliance adjustment Poor patient wear

Thank you: 

Thank you