Microscopic evaluation of induced tooth movement after subluxation trauma: an experimental study in rats.
OBJECTIVE
The 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).


METHODS
Forty 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.


RESULTS
In 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.


CONCLUSIONS
There was no difference in the quality of periodontal repair when ITM was applied to teeth that had suffered a subluxation trauma.
Mauro Carlos Agner
MC
Busato
Alex Luiz Pozzobon
AL
Pereira
Celso Koogi
CK
Sonoda
Osmar Aparecido
OA
Cuoghi
Marcos Rogério
MR
de Mendonça
D016301:Alveolar Bone Loss / Q000473:pathology; D000539:Alveolar Process / Q000293:injuries / Q000473:pathology; D000818:Animals; D003094:Collagen; D003739:Dental Cementum / Q000293:injuries / Q000473:pathology; D003804:Dentin / Q000473:pathology; D005347:Fibroblasts / Q000473:pathology; D008297:Male; D008963:Molar / Q000293:injuries* / Q000473:pathology; D009969:Orthodontic Wires; D010513:Periodontal Ligament / Q000293:injuries / Q000473:pathology; D010519:Periodontium / Q000293:injuries / Q000473:pathology; D051381:Rats; D017208:Rats, Wistar; D012391:Root Resorption / Q000473:pathology; D013997:Time Factors; D020254:Tooth Ankylosis / Q000473:pathology; D019227:Tooth Apex / Q000473:pathology; D014084:Tooth Avulsion / Q000473:pathology*; D014087:Tooth Movement Techniques / Q000295:instrumentation / Q000379:methods*; D014092:Tooth Root / Q000293:injuries / Q000473:pathology; D014945:Wound Healing / Q000502:physiology
D003094:Collagen
Orthodontics; Periodontium; Tooth injuries