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Anchorage  in orthodontics  /certified fixed orthodontic courses by Indian dental academy
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Anchorage in orthodontics /certified fixed orthodontic courses by Indian dental academy



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Welcome to Indian Dental Academy
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Anchorage  in orthodontics  /certified fixed orthodontic courses by Indian dental academy Anchorage in orthodontics /certified fixed orthodontic courses by Indian dental academy Presentation Transcript

  • ANCHORAG E INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  • INTRODUCTION www.indiandentalacademy.com
  •  ANCHORAGE = RESISTANCE TO UNWANTED TOOTH MOVEMENT.  ANCHORAGE UNITS : The areas or units which provide this undesirable movement. www.indiandentalacademy.com
  • DE INIT ION F IT www.indiandentalacademy.com
  • THE SITE OF DELIVERY FROM WHICH FORCE IS EXERTED - white n gardner The nature and degree of resistance to displacement offered by an anatomic unit when used for the purpose of affecting tooth movement - GRABER  www.indiandentalacademy.com
  • CLASSIFICATION www.indiandentalacademy.com
  •  1. 2. 3.  1. 2. Acc. to manner of the force application as: Simple Stationary Reciprocal Acc. to the jaws involved as : Intra maxillary Inter maxillary www.indiandentalacademy.com
  •  1. 2. 3.  1. 2. 3. Acc. to the site of anchorage Intra oral Extra oral Muscular Acc.to the no. of anchorage units as : Simple Compound Reinforced www.indiandentalacademy.com
  •  1. 2. 3. 4. 5. 6. Acc. To white n gardner Simple Stationary Reciprocal Reinforced Inter maxillary Extra oral www.indiandentalacademy.com
  • Factors affecting anchorage www.indiandentalacademy.com
  • 1. 2.    Teeth Root forms Round – resistance is same in any direction Flat – resist tooth movement in M-D direction eg. mand. Incisors & molars , buccal roots of max. molars ( tripod arrangement of roots ) Triangular – offers greater resistance to movement. Eg. Maxillary canine & lateral incisor www.indiandentalacademy.com
  • 1. 2. 3. 4. 5. Size n no. of roots – large surface area & multirooted teeth > resistance Root length – deeper the root embeded > resistance Position of tooth in the dental arch – eg. Mandi. 2 nd molar is located bt. Two ridges of basal bone , so offer more resistance to bodily movement Inclination of tooth – axial inclination is in opposite direction to force , greater resistance Mutual support www.indiandentalacademy.com
  • 1. Basal bone – eg.hard palate & lingual surface of the mandible in anterior region. 2. The musculature – Hypotonic m. - Flaring & spacing Hypertonic m. - Collapse of the teeth lingually eg.Nance palatal button ( use of hard palate to provide resistance to mesial movement of max. molar www.indiandentalacademy.com
  • SOURCES OF ANCHORAGE www.indiandentalacademy.com
  •  1. 2. 3. 4.  1. 2. 3. 4.  INTRA –ORAL : Individual teeth Multiple tooth units Encasement (eg.Inclined planes) Occluding teeth OTHERS : Holding Arches Basal bone Neck cranium Occipital region MUSCULATURE : lip bumper www.indiandentalacademy.com
  • ANCHORAGE PLANNING www.indiandentalacademy.com
  • Depends on : 1. 2. 3. 4. 5. The number of teeth to be moved The type of teeth to be moved Type of tooth movement Periodontal condition Duration of tooth movement www.indiandentalacademy.com
  • INTRA MAXILLARY ANCHORAGE www.indiandentalacademy.com
  • Within the same jaw ( either maxilla or mandible )  Eg.Elastic chains are used to retract the anterior segment using the posterior teeth as anchorage unit.  www.indiandentalacademy.com
  • Sub- divisions 1. 2. 3. Simple Stationary Reciprocal www.indiandentalacademy.com
  • INTER MAXILLARY ANCHORAGE www.indiandentalacademy.com
  • Also called “BAKER’S ANCHORAGE”  When the anchorage units situated in the one jaw are used to provide the force required to move teeth in the opposing jaw.  SUB DIVISION : Simple Staionary Reciprocal 1. 2. 3. www.indiandentalacademy.com
  •  Eg. When class II elastics are used to retract the maxillary anteriors , the anchorage units are situated in the mandibular arch. www.indiandentalacademy.com
  •  CLASS III INTER MAXILLARY ELASTICS www.indiandentalacademy.com
  • SIMPLE ANCHORAGE www.indiandentalacademy.com
  •   When the manner & application of force is such that it tends to change the axial inclination of the tooth or teeth that form the anchorage unit in the plane of the space in which the force is applied. Simple anchorage is obtained by engaging a greater number of teeth than are to be moved www.indiandentalacademy.com
  • NT: The root surface area of the anchorage unit should be at least double that of the units to be moved. eg. Anterior retraction with the help of a HAWLEY’S appliance The movement of a single tooth using a screw appliance www.indiandentalacademy.com
  • STATIONARY ANCHORAGE www.indiandentalacademy.com
  •  When the application of force tends to displace the anchorage unit bodily in the plane of space in which force is being applied  The anchorage potential of teeth being moved bodily is considerably greater as compare to teeth being moved using a tipping force. www.indiandentalacademy.com
  •  Mandibular molars are bodily pitted against the tipping forces of the maxillary anteriors. www.indiandentalacademy.com
  • RECIPROCAL ANCHORAGE www.indiandentalacademy.com
  •    When two teeth or two sets of teeth move to an equal extend in an opposite direction . Here the root surface area of the anchorage unit is equal to that of the teeth to be moved. The effect of the forces exerted is equal. www.indiandentalacademy.com
  • • Cross Elastic To Correct Molar Cross-bite  Ni-Ti Molar Rotator  Arch expansion using a midline screw www.indiandentalacademy.com
  • SINGLE OR PRIMARY ANCHORAGE  The resistance provided by single tooth with greater alveolar support is used to move another tooth with lesser alveolar support.  Eg. Molar being used to retract a pre molar www.indiandentalacademy.com
  • COMPOUND ANCHORAGE  The resistance is provided by more than one tooth with greater support is used to move teeth with less support.  Eg. Retracting incisors using loop mechanics www.indiandentalacademy.com
  • REINFORCED ANCHORAGE www.indiandentalacademy.com
  •  The anchorage units are reinforced by the use of more than one type of resistance units. www.indiandentalacademy.com
  •  Anterior inclined plane Exerts a backward pull on the maxillary appliance through the mandible www.indiandentalacademy.com
  •  SVED BITE PLANE : Prevent from being inclined labially. www.indiandentalacademy.com
  •  A rigid labial bow : To engage labial surface of the incisor at the junction of cervical & incisal third of each crown. www.indiandentalacademy.com
  •  Banding of 2nd molar for the retraction of permanent canine www.indiandentalacademy.com
  • EXTRA ORAL ANCHORAGE www.indiandentalacademy.com
  •  The extra oral structure most commonly used are : 1. Cervical region The occiput The forehead The chin 2. 3. 4. www.indiandentalacademy.com
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  • Extra oral forces to augment anchorage www.indiandentalacademy.com
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  • Advantage  The anchorage unit is far away from the actual site where the movement is taking place, so less chances of any change in the anchorage units www.indiandentalacademy.com
  • Disadvantage    Lack of patient’s co- operation Anchorage assembly is bulky & externally visible Decrease in the number of hours for which the anchorage assembly is worn, so affects quality of result achieved www.indiandentalacademy.com
  • MUSCULAR ANCHORAGE www.indiandentalacademy.com
  •    Peri oral musculature is not so strong but also resilient. The forces generated by the musculature sometimes used to bring about tooth movement. eg.Lip bumper appliance (to distalize mandibular 1st molars) www.indiandentalacademy.com
  • ANCHORAGE LOSS  It is the movement of the reaction unit or the anchor unit instead of the teeth to be moved. www.indiandentalacademy.com
  • ANCHORAGE DEMAND  Depending on anchorage loss : - 1. Maximum anchorage case Moderate anchorage case Minimum anchorage case 2. 3. www.indiandentalacademy.com
  • Maximum anchorage cases  Anchorage demand is very high  Not more than ¼ th of the extraction space should be lost by forward movement of the anchor teeth www.indiandentalacademy.com
  • Moderate anchorage cases  Anchor teeth can be permitted to move forward into ¼ th to ½ of the extraction space. www.indiandentalacademy.com
  • Minimum anchorage cases  Anchorage demand is very low www.indiandentalacademy.com
  • ADVANCEMENT IN ANCHORAGE www.indiandentalacademy.com
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  • Thank you www.indiandentalacademy.com Leader in continuing dental education www.indiandentalacademy.com