Changes in force associated with the amount of aligner activation and lingual bodily movement of the maxillary central incisor / 대한치과교정학회지
The Korean Journal of Orthodontics
;
: 65-72, 2016.
Article
in English
| WPRIM
| ID: wpr-162543
ABSTRACT
OBJECTIVE:
The purposes of this study were to measure the orthodontic forces generated by thermoplastic aligners and investigate the possible influences of different activations for lingual bodily movements on orthodontic forces, and their attenuation.METHODS:
Thermoplastic material of 1.0-mm in thickness was used to manufacture aligners for 0.2, 0.3, 0.4, 0.5, and 0.6 mm activations for lingual bodily movements of the maxillary central incisor. The orthodontic force in the lingual direction delivered by the thermoplastic aligners was measured using a micro-stress sensor system for the invisible orthodontic technique, and was monitored for 2 weeks.RESULTS:
Orthodontic force increased with the amount of activation of the aligner in the initial measurements. The attenuation speed in the 0.6 mm group was faster than that of the other groups (p < 0.05). All aligners demonstrated rapid relaxation in the first 8 hours, which then decreased slowly and plateaued on day 4 or 5.CONCLUSIONS:
The amount of activation had a substantial influence on the orthodontic force imparted by the aligners. The results suggest that the activation of lingual bodily movement of the maxillary central incisor should not exceed 0.5 mm. The initial 4 or 5 days is important with respect to orthodontic treatment incorporating an aligner.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Relaxation
/
Incisor
Language:
English
Journal:
The Korean Journal of Orthodontics
Year:
2016
Type:
Article
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