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Introduction: Incisal torque in orthodontics has always been important due to its relationship with smile aesthetics and the stability of a final treatment outcome. The aim of this study was to quantify the accuracy of torque expression predicted by ClinCheck® planning associated with Invisalign® treatment, compared to clinical outcomes.
Methodology: Forty adult patients consecutively treated using the Invisalign appliance were selected. Torque and the interincisal angle (IIA) were measured at T0 (pretreatment), T1 (predicted post-treatment), and R (end of initial aligner sequence) stages on STL files using metrology software (Geomagic Control X).
Results: The difference between the predicted and achieved torque (torque differential) was statistically significant (<italic>P</italic> &lt; 0.001) in the labial crown torque group with a mean of 6.43° (SD = 7.09) for the upper central incisor, 5.06° (SD = 7.32) for the upper lateral incisor and 2.75° (SD = 5.7) for the lower incisor sub-groups. In contrast, the corresponding lingual/palatal crown torque sub-groups did not show a statistically significant torque differential (<italic>P</italic> >0.05). Similar observations were made for the IIA differential (difference between predicted and achieved IIA) with a mean IIA differential of 9° (SD = 10.73; <italic>P &lt;</italic> 0.001) and -3.4° (SD = 7.9; <italic>P</italic> > 0.05) in the labial and lingual/palatal crown torque IIA groups, respectively.
Conclusions: Torque was under-expressed when the teeth were moving labially, and fully- or over-expressed when moved lingually, indicating Invisalign’s inefficiency in torqueing incisors in the labial direction.
</abstract>

Introduction: Incisal torque in orthodontics has always been important due to its relationship with smile aesthetics and the stability of a final treatment outcome. The aim of this study was to quantify the accuracy of torque expression predicted by ClinCheck® planning associated with Invisalign® treatment, compared to clinical outcomes.
Methodology: Forty adult patients consecutively treated using the Invisalign appliance were selected. Torque and the interincisal angle (IIA) were measured at T0 (pretreatment), T1 (predicted post-treatment), and R (end of initial aligner sequence) stages on STL files using metrology software (Geomagic Control X).
Results: The difference between the predicted and achieved torque (torque differential) was statistically significant (P < 0.001) in the labial crown torque group with a mean of 6.43° (SD = 7.09) for the upper central incisor, 5.06° (SD = 7.32) for the upper lateral incisor and 2.75° (SD = 5.7) for the lower incisor sub-groups. In contrast, the corresponding lingual/palatal crown torque sub-groups did not show a statistically significant torque differential (P >0.05). Similar observations were made for the IIA differential (difference between predicted and achieved IIA) with a mean IIA differential of 9° (SD = 10.73; P < 0.001) and -3.4° (SD = 7.9; P > 0.05) in the labial and lingual/palatal crown torque IIA groups, respectively.
Conclusions: Torque was under-expressed when the teeth were moving labially, and fully- or over-expressed when moved lingually, indicating Invisalign’s inefficiency in torqueing incisors in the labial direction.

Reliability of torque expression by the Invisalign® appliance: A retrospective study

Australasian Orthodontic Journal

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Reliability of torque expression by the Invisalign appliance: A retrospective study

Introduction: Incisal torque in orthodontics has always been important due to its relationship with smile aesthetics and the stability of a final treatment outcome. The aim of this study was to quantify the accuracy of torque expression predicted by ClinCheck® planning associated with Invisalign® treatment, compared to clinical outcomes.
Methodology: Forty adult patients consecutively treated using the Invisalign appliance were selected. Torque and the interincisal angle (IIA) were measured at T0 (pretreatment), T1 (predicted post-treatment), and R (end of initial aligner sequence) stages on STL files using metrology software (Geomagic Control X).
Results: The difference between the predicted and achieved torque (torque differential) was statistically significant (P 0.05). Similar observations were made for the IIA differential (difference between predicted and achieved IIA) with a mean IIA differential of 9° (SD = 10.73; P  0.05) in the labial and lingual/palatal crown torque IIA groups, respectively.
Conclusions: Torque was under-expressed when the teeth were moving labially, and fully- or over-expressed when moved lingually, indicating Invisalign’s inefficiency in torqueing incisors in the labial direction.

Introduction: Incisal torque in orthodontics has always been important due to its relationship with smile aesthetics and the stability of a final treatment...

Reliability of torque expression by the Invisalign^® appliance: A retrospective study

Article Category: research-article

Online veröffentlicht: 13. Juli 2021

Seitenbereich: 3 - 13

DOI: https://doi.org/10.21307/aoj-2021-001

© 2021 Raj Gaddam et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.