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Orthodontic Screw

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Orthodontic Screw

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Types of screw:

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• Two dimension expanding screw. ( used in patient with bilateral posterior crossbite)

• Three dimension expanding screw. (used in patient with bilateral posterior crossbite and anterior crossbite)
• Fan type expanding screw.
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Quarter turn activation of the screw will produce 0.25mm expansion

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Uses of orthodontic screw

• 1. Expansion.
• a. Bilateral expansion.
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Fan type expander

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Uses of orthodontic screw

b. Unilateral expansion.
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Uses of orthodontic screw

2. Distal movement.
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Distalization of molar is very easy if 6/6 are driftedmesially due to early loss of deciduous molars.
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Uses of orthodontic screw

3. In mild class III malocclusions with a slight upper arch crowding.
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DISADVATAGES:

• Bulky appliance.
• Patient cooperation is needed since relapse is quick and may elongate treatment time.
• Over activation may lead to difficulty during insertion.


رفعت المحاضرة من قبل: Mustafa Shaheen
المشاهدات: لقد قام 4 أعضاء و 131 زائراً بقراءة هذه المحاضرة






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