Innovative design of closing loops producing an optimal force system applicable in the 0.022-in bracket slot system

Mayumi Sumi, Yoshiyuki Koga, Jun ya Tominaga, Ryo Hamanaka, Hiroya Ozaki, Pao Chang Chiang, Noriaki Yoshida

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Introduction Most closing loops designed for producing higher moment-to-force (M/F) ratios require complex wire bending and are likely to cause hygiene problems and discomfort because of their complicated configurations. We aimed to develop a simple loop design that can produce optimal force and M/F ratio. Methods A loop design that can generate a high M/F ratio and the ideal force level was investigated by varying the portion and length of the cross-sectional reduction of a teardrop loop and the loop position. The forces and moments acting on closing loops were calculated using structural analysis based on the tangent stiffness method. Results An M/F ratio of 9.3 (high enough to achieve controlled movement of the anterior teeth) and an optimal force level of approximately 250 g of force can be generated by activation of a 10-mm-high teardrop loop whose cross-section of 0.019 × 0.025 or 0.021 × 0.025 in was reduced in thickness by 50% for a distance of 3 mm from the apex, located between a quarter and a third of the interbracket distance from the canine bracket. Conclusions The simple loop design that we developed delivers an optimal force and an M/F ratio for the retraction of anterior teeth, and is applicable in a 0.022-in slot system.

Original languageEnglish
Pages (from-to)968-978
Number of pages11
JournalAmerican Journal of Orthodontics and Dentofacial Orthopedics
Volume150
Issue number6
DOIs
Publication statusPublished - Dec 1 2016
Externally publishedYes

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Tooth Movement Techniques
Hygiene
Canidae
Tooth

ASJC Scopus subject areas

  • Orthodontics

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Innovative design of closing loops producing an optimal force system applicable in the 0.022-in bracket slot system. / Sumi, Mayumi; Koga, Yoshiyuki; Tominaga, Jun ya; Hamanaka, Ryo; Ozaki, Hiroya; Chiang, Pao Chang; Yoshida, Noriaki.

In: American Journal of Orthodontics and Dentofacial Orthopedics, Vol. 150, No. 6, 01.12.2016, p. 968-978.

Research output: Contribution to journalArticle

Sumi, Mayumi ; Koga, Yoshiyuki ; Tominaga, Jun ya ; Hamanaka, Ryo ; Ozaki, Hiroya ; Chiang, Pao Chang ; Yoshida, Noriaki. / Innovative design of closing loops producing an optimal force system applicable in the 0.022-in bracket slot system. In: American Journal of Orthodontics and Dentofacial Orthopedics. 2016 ; Vol. 150, No. 6. pp. 968-978.
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AU - Ozaki, Hiroya

AU - Chiang, Pao Chang

AU - Yoshida, Noriaki

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