Impact of passive self-ligation and conventional elastic ligation on orthodontic force in the simulation of a mandibular lateral incisor linguoversion

Tochigi, Keisuke; Saze, Naomi; Arai, Kazuhito

doi:10.1016/j.ajodo.2019.03.029

Cited by 3 publications

(2 citation statements)

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“…A multi-sensor measurement system [ 19 , 20 ] with six load cells connected to stainless steel blocks that simulate the position of the mandibular bilateral central incisors, canines, and first molars was used to measure the orthodontic forces delivered to the 0.022-inch slot bracket (Damon Q, Ormco Corporation, Glendora, CA). Then, the positions of all stainless steel blocks were adjusted by micrometers (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Recent in vitro studies have used simulation systems with three-dimensional six-axis force sensors to accurately detect the orthodontic force delivered by preformed archwires to the brackets attached to each tooth of a dental arch [18][19][20]. These simulation systems have been utilized to evaluate the magnitude and direction of orthodontic forces in three-dimensional space to investigate simulations of cases of labially displaced maxillary canines [18] or lingually displaced mandibular lateral incisors [20].…”

Section: Introductionmentioning

confidence: 99%

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Impact of the prefabricated forms of NiTi archwires on orthodontic forces delivered to the mandibular dental arch

et al. 2021

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Background Although preformed archwires with a variety of arch forms are currently commercially available, the effects of variation in the shape of these archwires on the orthodontic force at each tooth are not well understood. Therefore, we evaluated the forces delivered by various types of commercially available preformed nickel–titanium alloy (NiTi) archwires in a simulated mandibular dental arch. Methods Sixty-three types of 0.019 × 0.025-inch preformed NiTi archwires from 15 manufactures were selected for analysis. The intercanine width (ICW) and intermolar width (IMW) of each archwire were measured at the mean canine and first molar depths of 30 untreated subjects with normal occlusions. Each archwire was placed in a multi-sensor measurement system simulating the mandibular dental arch of subjects with normal occlusions, and orthodontic forces in the facial-lingual direction at the central incisors, canines, and first molars were measured. Correlations between the ICW, IMW, and ICW/IMW ratio of archwires and the delivered forces were analyzed. The archwires were classified into the following four groups according to the ICW and IMW: Control group, ICW and IMW are within the means ± standard deviations of the normal ranges; Ovoid group, narrow ICW and IMW; Tapered group, narrow ICW; and Square group, narrow IMW. The forces were compared among these groups for each tooth. Results Significant correlations between the measured archwire width and force to each tooth were found, except between IMW and forces at the central incisors and canines. Significant differences in the forces were found among all groups, except between the Ovoid and Tapered groups at all teeth and between the Ovoid/Tapered and Control groups at the first molar. Significantly greater orthodontic forces in the facial direction were delivered at the central incisors by the archwires in the Ovoid and Tapered groups when compared with the archwires in the other groups. Conclusion These findings suggest that there is a possible risk of a clinically significant level of unfavorable orthodontic force being delivered to the mandibular incisors in labial inclination when using a preformed archwire with an ICW that is narrower than the dental arch.

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Section: Methodsmentioning

confidence: 99%