A cone-beam computed tomographic study evaluating the efficacy of incisor movement with clear aligners: Assessment of incisor pure tipping, controlled tipping, translation, and torque

Jiang, Ting; Jiang, Yu-Nan; Chu, Fei; Lü, Peng; Tang, Guoyao

doi:10.1016/j.ajodo.2019.11.025

Cited by 62 publications

(38 citation statements)

References 15 publications

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“…Compared with Damon Q, more maxillary incisors lingual inclination changes were recorded from T0-T1, and especially apparent in the subgroup Ⅲ, indicating more tipping movements for severely protruded maxillary incisors. The previous report [ 17 – 19 ] also have the similar findings, as more labial root deviation and insufficient torque expression with Invisalign ® when applied in extraction cases. Meanwhile, the more labial root deviation with Invisalign ® also indicated a higher risk of creating or exacerbating bone fenestration during orthodontic treatment [ 20 ] although Invisalign ® used to be considered good for periodontal health.…”

Section: Discussionsupporting

confidence: 71%

Comparisons of maxillary incisor retraction effects for patients with first premolar extractions between Damon Q and Invisalign®: A retrospective study

et al. 2022

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Torque control of maxillary incisors is very important in maxillary protrusion patients with first premolars extraction, but the efficacy of maxillary incisor retraction of clear aligners is still controversial now. This retrospective study was aimed to compare the retraction effects between Damon Q and Invisalign ® appliances in patients with first premolar extractions. 59 patients (33 cases with Damon Q and 26 cases with Invisalign ® ) with first premolar extraction were selected in this study. Subsequently, patients of each group were allocated into three subgroups according to the pretreatment value of U1-NA (°). The retraction effects of maxillary incisors and upper lips were accessed by the variations of cephalometric, overbite and overjet measurements. Treatment duration with Invisalign ® (31.4 ± 6.4 months) was longer than Damon Q (27.7 ± 6.3 months) (P = .03). The angular measurements, U1-NA (°) and U1-SN (°) showed more lingual crown inclinations in Invisalign ® group than Damon Q group (P ≤ .04). When evaluating linear measurements, the retractions of the maxillary incisors and upper lip positions showed no significant differences (P ≥ .13). Invisalign ® group also showed more lingual crown retractions and labial root deviations compared to Damon Q group in subgroup Ⅲ (P ≤ .037). As regards to the molar relationship, Invisalign ® displayed less Class Ⅰ molar relationship than Damon Q group. The increased overbite of anterior incisors was also showed in the Invisalign ® treatment group (P ≤ .047). Invisalign ® was not sufficiently effective in retracting maxillary incisors compared with Damon Q appliances. Invisalign ® led to more lingual inclination movement and increased overbite.

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Section: Discussionsupporting

confidence: 71%

Comparisons of maxillary incisor retraction effects for patients with first premolar extractions between Damon Q and Invisalign®: A retrospective study

et al. 2022

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“…Previous studies determined that tipping movement is the most predictable movements with clear aligner, but there still remains somewhat difficult to achieve a comparable amount of root control [ 16 – 19 ]. Elkholy et al [ 17 ] used 3D sensor to record the force to moment (F/M) induced by aligners for sagittal displacement and found that the bodily components of tooth movement generated by the aligners were negligibly small.…”

Section: Discussionmentioning

confidence: 99%

Torque movement of the upper anterior teeth using a clear aligner in cases of extraction: a finite element study

et al. 2022

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Background Clear aligner treatment has become popular over recent years. It is necessary to identify methods by which we could avoid the bowing effect in extractions with clear aligner. The present study was to identify the appropriate method to design torque movement involving the upper anterior teeth of extraction cases, in order to maintain or improve the axis and torque of the upper anterior teeth with a clear aligner during movement and closure of the extraction space. Results As the height of the power ridge increased, the rotation angle of the upper central incisor in the sagittal direction decreased gradually and the location of the rotation center changed significantly; the rotation center moved in the apical direction and then changed to the crown side. The highest von-Mises stress of the upper central incisor root, periodontal ligaments, and alveolar bone, showed little change as the power ridge height increased. When the axial inclination of the upper central incisor was normal (U1-SN = 105°), the tendency of movement for the upper central incisor approached translation with a power ridge height of 0.7 mm (corresponding distorted angle: 5.8415). When the axial inclination of the upper central incisor was oversized (U1-SN = 110°), the axial inclination of the upper central incisor reduced to normal following completion of the anterior segment retraction with a power ridge of 0.4 mm (corresponding distorted angle: 3.4265). Conclusion Analysis indicates that pure palatal tipping movement of the upper anterior teeth is generated without torque control, thus resulting in the bowing effect. The required torque control of the upper anterior teeth with oversize axial inclination is weaker than that of the upper anterior teeth with normal axial inclination because limited torque loss is expected for oversize axial inclination teeth. Variation sensitivity of the rotation center should be considered carefully due to biological problems when designing translation of the upper anterior teeth with normal axial inclination.

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“…There are some recent studies which have shown that bodily movement is possible with clear aligners and they are as effective as fixed orthodontic therapy. 12,13 However we should be very caution while selecting the cases in clear aligner therapy as the final outcome depends upon the virtual planning, aligner material, attachment designs, patient compliance and many other factors.…”

Section: Ojnmentioning

confidence: 99%

Treatment of generalized spacing with clear aligner therapy: Report of a case

et al. 2021

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Clear Aligners are becoming popular among patients in recent years because of its invisible nature , comfort to wear, less orthodontic emergencies and better hygiene control. However proper case selection is vital for the success. With the better understanding of aligner biomechanics and improvement in aligner materials and attachment design, more complex teeth movement is also possible with clear aligners. As there is always controversy on whether aligners cause tipping or bodily tooth movement, In this case report, a skeletal class I patient with generalized spacing in maxilla and mandible is presented which is treated effectively by bodily movement of incisors.

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A cone-beam computed tomographic study evaluating the efficacy of incisor movement with clear aligners: Assessment of incisor pure tipping, controlled tipping, translation, and torque

Cited by 62 publications

References 15 publications

Comparisons of maxillary incisor retraction effects for patients with first premolar extractions between Damon Q and Invisalign®: A retrospective study

Comparisons of maxillary incisor retraction effects for patients with first premolar extractions between Damon Q and Invisalign®: A retrospective study

Torque movement of the upper anterior teeth using a clear aligner in cases of extraction: a finite element study

Treatment of generalized spacing with clear aligner therapy: Report of a case

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