Initial orthodontic tooth movement of a multirooted tooth: a 3D study of a rat molar.
Orthod Craniofac Res
; 18(3): 134-42, 2015 Aug.
Article
em En
| MEDLINE
| ID: mdl-25620043
ABSTRACT
OBJECTIVE:
To elucidate the 3D interactions in the tooth-PDL-bone complex immediately after application of orthodontic forces and their implications on tooth movement and function.METHODS:
A special visualization method using microCT allows us to directly image in 3D the movements of a multirooted molar tooth inside the alveolar bone as well as the collagenous network of the PDL. Using fresh, unstained rat mandibular 1st molar under mesial loads of 0.5-1 N, we address basic concepts in orthodontics during the initial stages of orthodontic movement.RESULTS:
We show that immediately after the application of orthodontic load, direct distinct contacts between the tooth and the bone form in the furcation area. These contacts limit tooth movement and interfere with whole body translation. Only localized sites of highly compressed PDL between the root surfaces and the bone were observed. In general, the collagenous network of the PDL appeared loose and not densely packed in the compressed side. On the tension side, the fibers maintained their overall orientation without any significant extension of the fibers.CONCLUSIONS:
Localized direct contact areas between the tooth roots and the bone at the furcation already form within a few minutes of orthodontic tooth movement. This direct and localized bone involvement guides the movement trajectory and provides a mechanism for the miscorrelation found between force levels and tooth movement during the initial stages of an orthodontic tooth movement.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Técnicas de Movimentação Dentária
/
Imageamento Tridimensional
/
Dente Molar
Limite:
Animals
Idioma:
En
Revista:
Orthod Craniofac Res
Assunto da revista:
ODONTOLOGIA
/
ORTODONTIA
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Israel