Original scientific paper

Analysis of Tooth Movement Caused by the Effect of Active Plates

Mladen Šlaj ; Zavod za ortodonciju Stomatološki fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Tatjana Milošak ; Zavod za ortodonciju Stomatološki fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Senka Rajić-Meštrović ; Zavod za ortodonciju Stomatološki fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Marina Lapter ; Zavod za ortodonciju Stomatološki fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska

Abstract

Numerous appliances are used for distal movement of molars: different modifications of active plates, Headgear; magnets, superelastic NiTi springs and loops etc. The aim of this investigation was to use an electronic computer to analyse the movement of teeth, which occur during the effect of active plates with unilateral and bilateral screws for distalization on models, with or without second permanent molars. The method was divided into four separate experiments, depending on whether the second molars were present and whether activation of the screw was unilateral or bilateral. Activation of the plate for unilateral or bilateral distalization of molars with first molars present demonstrated that it is possible to carry out distalization of first molars while second molars are still not present, although with negative accompanying effects such as: protrusion of the frontal teeth and messial movement of canines. Activation of a plate for unilateral or bilateral distalization of molars with first and second molars present demonstrated that the first and second molars cannot, and must not, be distalized by plates at the same time, because the only real movements are reactive, i.e. protrusion of frontal teeth and canine, and marked and uncontrolled buccal inclination of molars.

Keywords

active plate; distalization

Hrčak ID:

97647

URI

https://hrcak.srce.hr/97647

Publication date:

15.9.1999.

Article data in other languages: croatian

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