Microscopic evaluation of induced tooth movement after subluxation trauma: an experimental study in rats

Abstract

ObjectiveThe objective of this study was to assess the histological alterations that occurred in the periodontal area of rat molars submitted to induced tooth movement (ITM) right after an intentional trauma (subluxation). MethodsForty adult male Wistar rats (Rattus norvegicus albinus) were selected. The animals were divided into eight groups (n = 5), according to the combination of variables: Group 1 - control (neither trauma nor ITM); Group 2 - ITM; Groups 3, 4, 5 and 6 - dentoalveolar trauma groups corresponding, respectively, to 1, 3, 8 and 10 days after trauma; Groups 7 and 8 - the animals' molars were subjected to a 900 cN impact and, one and three days after the trauma event, tooth movement was induced. The rats' maxillary first molars were mesially moved during seven days with a closed coil (50 cN). After the experimental period of each group, the animals were sacrificed by anesthetic overdose and the right maxillas were removed and processed for histological analysis under light microscopy. ResultsIn the animals of group 3, 4, 5 and 6, the histological alterations were not very significant. Consequently, the effect of induced tooth movement right after a subluxation event (groups 7 and 8) was very similar to those described for Group 2. ConclusionThere was no difference in the quality of periodontal repair when ITM was applied to teeth that had suffered a subluxation trauma.

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“…Buna karşın Busato ve ark. (11), ratlarda deneysel olarak oluşturdukları sublüksasyon yaralanması sonrası ortodontik kuvvetin etkisini değerlendirdikleri çalışmalarında, sublüksasyondan 1 ve 3 gün sonra uygulanan diş hareketi sonucu periodontal dokularda kalitatif olarak fark bulmamışlardır ve ortodontik hareket için 3 ay beklemenin gerekmediğini ileri sürmüşlerdir. Benzer şekilde Pereira ve ark.…”