Biomechanical features of tooth movement from a lingual appliance in comparison with a labial appliance during space closure in sliding mechanics.
Am J Orthod Dentofacial Orthop
; 162(3): 307-317, 2022 Sep.
Article
em En
| MEDLINE
| ID: mdl-35422375
ABSTRACT
INTRODUCTION:
The objectives of this study were to simulate long-term orthodontic tooth movement in en-masse retraction using the finite element method and investigate the effects of power arms on tooth movements when using a lingual appliance in comparison with a labial appliance.METHODS:
A 3-dimensional finite element model of the maxillary dentition was constructed with 0.018-in brackets and 0.016 × 0.022-in stainless steel archwire. An en-masse retraction was performed by applying retraction force at various lengths of the power arm (4, 6, 8, and 10 mm) to the second molar tube, and long-term tooth movements with the lingual and labial appliances were analyzed using the finite element method.RESULTS:
Although lingual crown tipping of the incisor was more marked with the lingual appliance than with the labial appliance in the early phase of space closure, only a slight difference was evident after space closure. Although the power arm was effective for achieving better-controlled tooth movement and reducing vertical and transverse bowing effects, bodily movement of the incisor could not be achieved, and bowing effects could not be eliminated.CONCLUSIONS:
To provide better torque control of the incisor or prevent a vertical bowing effect, the incorporation of extra torque into brackets of incisors was recommended, and the use of power arms for the lingual appliance. To prevent a transverse bowing effect, incorporation of the antibowing bend or application of retraction force from both buccal and lingual sides or temporary skeletal anchorage devices was recommended.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Braquetes Ortodônticos
/
Procedimentos de Ancoragem Ortodôntica
Limite:
Humans
Idioma:
En
Revista:
Am J Orthod Dentofacial Orthop
Assunto da revista:
ODONTOLOGIA
/
ORTODONTIA
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Japão