American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics · 2009
Early tooth movement with a clear plastic appliance in rats.
Сравнительное исследованиеСтатьяПоддержка исследования: вне правительства СШАНазвание и аннотация: Перевод пока не подготовлен
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Sombuntham Nonglak P, Songwattana Siriwan, Atthakorn Phumvuth, Jungudomjaroen Sumon, Panyarachun Busaba
Аннотация
INTRODUCTION: In this preliminary study, we investigated early histologic changes of paradental tissues in response to a clear plastic appliance in rats.
METHODS: Fifteen rats were divided into 3 groups. Group I was the untreated controls; group II received a clear plastic appliance made from a model, with the maxillary left first molar repositioned mesially 0.5 mm from the origin; and group III had a closed-coil spring to move the molar mesially. Specimens were prepared in parasagittal sections, and changes in paradental tissues were evaluated on days 1, 4, and 7 by light microscopy.
RESULTS: In group II, the periodontal ligament (PDL) was compressed in the bifurcation and apical areas of the roots of the molar. On day 7, the PDL of the apical and distal aspects of the roots and the bifurcation area showed further compression, with the PDL of the roots stretched along the mesial side. In group III, a disorganized and compressed PDL in the mesial cervical half and interradicular septum was observed, and the stretched fibers were at the distal aspects of the roots after days 4 to 7.
CONCLUSIONS: Early histologic changes in response to the clear plastic appliance were intrusion and distal tipping despite the intended mesial movement. In this rat model, the observed histologic changes were subject to the direction and magnitude of forces generated by the clear aligner.
METHODS: Fifteen rats were divided into 3 groups. Group I was the untreated controls; group II received a clear plastic appliance made from a model, with the maxillary left first molar repositioned mesially 0.5 mm from the origin; and group III had a closed-coil spring to move the molar mesially. Specimens were prepared in parasagittal sections, and changes in paradental tissues were evaluated on days 1, 4, and 7 by light microscopy.
RESULTS: In group II, the periodontal ligament (PDL) was compressed in the bifurcation and apical areas of the roots of the molar. On day 7, the PDL of the apical and distal aspects of the roots and the bifurcation area showed further compression, with the PDL of the roots stretched along the mesial side. In group III, a disorganized and compressed PDL in the mesial cervical half and interradicular septum was observed, and the stretched fibers were at the distal aspects of the roots after days 4 to 7.
CONCLUSIONS: Early histologic changes in response to the clear plastic appliance were intrusion and distal tipping despite the intended mesial movement. In this rat model, the observed histologic changes were subject to the direction and magnitude of forces generated by the clear aligner.
Предметные рубрики MeSH
Alveolar ProcessAnimalsBiomechanical PhenomenaBone ResorptionDental AlloysDental CementumDentinMaleModels, AnimalMolarNickelOrthodontic Appliance DesignOrthodontic BracketsOrthodontic WiresOsteoclastsPeriodontal LigamentPlasticsPressureRandom AllocationRatsRats, Sprague-DawleyRoot ResorptionStress, MechanicalTitaniumTooth ApexTooth CervixTooth Movement TechniquesTooth Root