Showing posts with label ORTHODONTIA. Show all posts
Showing posts with label ORTHODONTIA. Show all posts

SPACE MAINTAINERS




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SPACE MAINTENANCE IN THE PRIMARY DENTITION

Space maintenance can be defined as the provision of an appliance (active or passive) which is concerned only with the control of space loss without taking into consideration measures to supervise the development of dentition.
Space maintainers are appliances used to maintain space or regain minor amounts of space lost, so as to guide the unerupted tooth into a proper position in the arch.
IDEAL REQUIREMENTS
  • It should maintain the entire mesio-distal space created by a lost tooth.
  • It must restore the function as far as possible & prevent over-eruption of opposing teeth.
  • It should be simple in construction.
  • It should be strong enough to withstand the functional forces.
  • It should not exert excessive stress on adjoining teeth.
  • It must permit maintenance of oral hygiene.
  • It must not restrict normal growth & development and natural adjustments which take place during the transition from deciduous to permanent dentition.
  • It should not come in the way of other functions.

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Anterior cross bite

Anterior cross bite

Possible causes

Class III skeletal pattern

Crowding

Retained primary teeth and roots



Presence of supernumerary teeth

Trauma

Clinical features
  • Instanding maxillary incisor occluding behind the corresponding lower incisors.
  • Over bite which can vary from nothing to excessive depth.
  • Gingival recession of the lower incisor involved.
  • Forward displacement of the  mandible-  instanding tooth comes into premature contact along the normal path of closure.
  •      mobility of the lower incisor involved in the cross bite.

Methods available for correction
Spoon handle biting.
Removable appliance with either cantilever spring or screw.
Lower inclined bite plane.
     
Spoon handle biting
Instruct the child to bite on a spoon handle to guide the incisor which is erupting into cross bite.
 Do not attempt this on an erupted incisor which has a positive over bite.
Once cross bite established,
Identify predisposing factors and remove them to prevent development of the cross bite
Once the cross bite is established, identify and remove aetiological factors responsible and select appropriate method for correction.

Removable appliance
Selection of appliance and the spring design depend on,
      Axial inclination of the tooth

Depth of the over bite.

Amount of forward movement required


Number of teeth involved in the cross bite

Appliance design
Select the best active component which should be used depending on the above factors discussed.
Adequate number of clasps
Add adequate number of clasps to the appliance to resist the reaction of the vertical component of the active force.
Appliance design
Add posterior bite plane to disocclude teeth
Instruction to the technician
Adams clasps on 6/6 d /d
Double cantilever spring(Z spring) on /1
Posterior bite plane (half molar capping)

Management of patient
Fit the appliance and give adequate instructions to the patient to wear it regularly including meal time.
Activate the spring by the correct amount.
Adjust clasps and check the thickness of the molar capping.
Give adequate instruction to the parents as well.
Monitor progress of treatment
If cross bite is corrected and depth of the over bite adequate to ensure the stability of the occlusion discontinue appliance
Monitor the development of the occlusion until the occlusion of the permanent dentition is established.
Incisors cross bite before and after correction

Incisor cross bite not corrected early lead to a severe malocclusion 


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ORTHO-PERIO INTERRELATIONS

ORTHO-PERIO INTERRELATIONS

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DENTAL MATRIX

Glossary_of_Orthodontic_Terms.....SOFTWARE

GLOSSARY OF ORTHODONTIC TERMS

MUST DOWNLOAD
SIZE: 29 MB
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IT IS A DATABASE SOFTWARE OF ORTHODONTIC TERMS.
INSTRUCTIONS:
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2. UNRAR OR EXTRACT THE CONTENTS.
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4. U CAN NOW SEARCH ANY ORTHODONTIC TERMINOLOGY.


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ANCHORAGE.......

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GROWTH OF MAXILLA

POWERPOINT PRESENTATION...
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MALOCCLUSION ORTHO.....PPT

MALOCCLUSION SEMINAR...
CLASSIFICATIONS AND CAUSES...
13 MB









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POWERPOINT PRESENTATION........ MYOFUNCTIONAL APPLIANCES


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