Authors' response

Morris, Jason W.; Campbell, Phillip M.; Tadlock, Larry P.; Boley, Jimmy C.; Buschang, Peter H.

doi:10.1016/j.ajodo.2018.03.001

Cited by 1 publication

(1 citation statement)

References 6 publications

(6 reference statements)

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“…A quantitative analysis of a change in torque of arch expansion using CAT is yet to be reported. Moreover, the type of tooth movement in CAT tends to be buccal tilt (Houle et al, 2017), and a less predictable buccal tilt is associated with a risk of severe periodontal destruction, including buccal gingival recession (Morris et al, 2017) and bone dehiscence (Sulewska et al, 2021). Therefore, it is worthwhile to further investigate how CAT can improve tooth movement efficiency and torque control.…”

Section: Introductionmentioning

confidence: 99%

Improvements of tooth movement efficiency and torque control in expanding the arch with clear aligners: a finite element analysis

Song

Jiang

Wang

et al. 2023

Front. Bioeng. Biotechnol.

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Objectives: The purpose of this study was to analyze the effect of different movement strategies, embossment structures, and torque compensation of the aligner on tooth movement during arch expansion using clear aligners by finite element analysis.Methods: Models comprising the maxilla, dentition, periodontal ligament, and aligners were created and imported into a finite element analysis software. The tests were performed using the following: three orders of tooth movement (including alternating movement with the first premolar and first molar, whole movement with second premolar and first molar or premolars and first molar), four different shapes of embossment structures (ball, double ball, cuboid, cylinder, with 0.05, 0.1, 0.15-mm interference) and torque compensation (0°, 1°, 2°, 3°, 4°, and 5°).Results: The expansion of clear aligners caused the target tooth to move obliquely. Alternating movement resulted in higher movement efficiency with lower anchorage loss as compared with whole movement. Embossment increased the efficiency of crown movement but did not contribute positively to torque control. As the angle of compensation increased, the tendency of oblique tooth movement was gradually controlled; however, the movement efficiency decreased concurrently, and stress distribution on the periodontal ligament became more even. For each 1° increase in compensation, the torque per millimeter of the first premolar would decrease by 0.26°/mm, and the crown movement efficiency eliminate decreased by 4.32%.Conclusion: Alternating movement increases the efficiency of the arch expansion by the aligner and reduces anchorage loss. Torque compensation should be designed to enhance torque control in arch expansion using an aligner.

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Section: Introductionmentioning

confidence: 99%