Changes in force associated with the amount of aligner activation and lingual bodily movement of the maxillary central incisor
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Objective: The purposes of this study were to measure the orthodontic forcesgenerated by thermoplastic aligners and investigate the possible influences ofdifferent activations for lingual bodily movements on orthodontic forces, andtheir attenuation. Methods: Thermoplastic material of 1.0-mm in thickness wasused to manufacture aligners for 0.2, 0.3, 0.4, 0.5, and 0.6 mm activations forlingual bodily movements of the maxillary central incisor. The orthodontic forcein the lingual direction delivered by the thermoplastic aligners was measuredusing a micro-stress sensor system for the invisible orthodontic technique,and was monitored for 2 weeks. Results: Orthodontic force increased with theamount of activation of the aligner in the initial measurements. The attenuationspeed 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 thendecreased slowly and plateaued on day 4 or 5. Conclusions: The amount ofactivation had a substantial influence on the orthodontic force imparted by thealigners. The results suggest that the activation of lingual bodily movement ofthe maxillary central incisor should not exceed 0.5 mm. The initial 4 or 5 days isimportant with respect to orthodontic treatment incorporating an aligner. [Korean J Orthod 2016;46(2):65-72]
Abstract
Objective: The purposes of this study were to measure the orthodontic forcesgenerated by thermoplastic aligners and investigate the possible influences ofdifferent activations for lingual bodily movements on orthodontic forces, andtheir attenuation. Methods: Thermoplastic material of 1.0-mm in thickness wasused to manufacture aligners for 0.2, 0.3, 0.4, 0.5, and 0.6 mm activations forlingual bodily movements of the maxillary central incisor. The orthodontic forcein the lingual direction delivered by the thermoplastic aligners was measuredusing a micro-stress sensor system for the invisible orthodontic technique,and was monitored for 2 weeks. Results: Orthodontic force increased with theamount of activation of the aligner in the initial measurements. The attenuationspeed 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 thendecreased slowly and plateaued on day 4 or 5. Conclusions: The amount ofactivation had a substantial influence on the orthodontic force imparted by thealigners. The results suggest that the activation of lingual bodily movement ofthe maxillary central incisor should not exceed 0.5 mm. The initial 4 or 5 days isimportant with respect to orthodontic treatment incorporating an aligner. [Korean J Orthod 2016;46(2):65-72]
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