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متخصص ارتودنسی و درمان ناهنجاری های فک و صورت

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Dr kazem dalaie

Assistant professor of orthodontics

Shahidbeheshti university of medical sciences-dental school-orthodontic department

 

Generally, the permanent first molars (PFM) are not appropriate teeth for extraction in orthodontic context.some  reasons are low effectiveness in anterior decrowding ,drifting of adjacent teeth,overeruption of opposite teeth and midlines deviations.on the other hand the first molars are the most susceptible  tooth to decay and enamel hypomineralized  defects in the oral cavity and During the mixed-dentition stage of dental development, dentists may be more exposed to first permanent molars with  poor long-term prognosis and have an only exraction option.

The aim of current study is presentation of factors can influence on extaction of   PFM with poor prognosis including occlusional and developmental factors.These factors have been discussed by case series. In occlusional factors from orthodontic view : severity of crowding,molar relationships,overjet and overbite, midlines deviation,skeletal relationship and soft tissue status have been considered .in developmental factors from dental developmental view:developmental stage of second permanent molars (SFM)(according to Demirjian stage), Presence or absence of third  molars ,second permanent molars angulation,dental age  of SFM ,second  premolar position and.. have been considered.some contraindication of PFM exractions are mentioned as well.

When planning extraction of PFMs with poor prognosis it is important to  consider whether future active appliance orthodontic  treatment will be necessary.

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آدرس: تقاطع میرداماد و شریعتی، ابتدای میرداماد، ساختمان شماره 3، طبقه 2
تلفن: 22225457 و 26406863
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