Evaluation of Tooth Movement Accuracy with Aligners: A Prospective Study

D’Antò, Vincenzo; Bucci, Rosaria; Simone, Vincenzo De; Ghislanzoni, Luis Huanca; Michelotti, Ambrosina; Rongo, Roberto

doi:10.3390/ma15072646

Cited by 30 publications

(30 citation statements)

References 36 publications

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“…Plenty of investigations [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 11 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ] stated a high percentage of mesial-rotation of upper first molars in Class II malocclusion. In 2019, de Oliveira-Viganò et al stated that dental Class II show the highest levels of mesio-palatal rotation of the upper first molars [ 15 ].…”

Section: Discussionmentioning

confidence: 99%

“…Our results showed an accuracy of 99% for the expansion movement. Several studies [ 17 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ] focused on the expansion movement with Clear Aligners, analysing the molar transversal movement predictability.…”

Section: Discussionmentioning

confidence: 99%

“…In a recent study, D’Antò et al (2022) [ 29 ] analysed movement accuracy with Clear Aligners and stated that upper first molars’ rotation showed a high predictability of success.…”

Section: Discussionmentioning

confidence: 99%

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Analysis of Maxillary First Molar Derotation with Invisalign Clear Aligners in Permanent Dentition

Lione

Paoloni

Razza

et al. 2022

Life

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The objective of this study was to examine the distal rotation of mesial rotated maxillary first permanent molars in a sample of Class II dental malocclusion adult patients treated with Invisalign Clear Aligners (CA). Forty patients (20 males, 20 females, 22.4 ± 3.9 years) were included in the study sample (Department of Orthodontics of University of Rome “Tor Vergata”). Inclusion criteria were: Caucasian ancestry, complete permanent dentition with fully erupted upper second molars, Class II molar relationship, absence of tooth or craniofacial anomalies or caries and periodontal diseases. Pre-treatment (T1), post-treatment (T2) digital casts, and final ClinCheck simulation models (T2CC) were analysed. To measure the rotation of maxillary first molars, Henry’s angle (H°) was evaluated. Maxillary first molars with an H° > 11° were considered mesio-rotated (in total 59 teeth). The treatment CA protocol included disto-rotation without distalization movements. At T1, T2 and T2CC five measurements on the collected dental casts were analysed: Henry’s angle (H°); mesial buccal expansion (ME); distal buccal expansion (DE); mesial buccal sagittal (MS); and distal buccal sagittal (DS). A comparison between the results of T2–T1 and T2CC–T2 was performed using a paired t-test. The differences between T2–T1 highlighted a significant distal rotation of the maxillary first molars (−7.4°) and an expansion movement of 2.20 mm for ME and 1.50 mm for DE. In the post-treatment, the mesial buccal cusps shifted of 1.0 mm, while the distal buccal cusps showed a distal movement of 0.9 mm. Analysing the H° comparison between T2CC-T2, the difference was −1.1°. The T2CC-T2 comparison in the sagittal plane showed a difference of 0.9 mm for the MS and 0.7 mm for the DS. The accuracy was 82% for molar derotation movement. In conclusion, CA provides the upper arch expansion associated with the upper first molars’ distal rotation. These movements provide 2 mm of improvement in arch perimeter and molar intercuspation.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of Maxillary First Molar Derotation with Invisalign Clear Aligners in Permanent Dentition

Lione

Paoloni

Razza

et al. 2022

Life

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“…Bodily retraction of relative upright incisors was also frequently encountered among extraction cases; this is a complicated tooth movement that requires adequate intrusion and torque control of the incisors [ 30 ]. Simon et al reported that root torque and the intrusion of incisors could not be fully achieved by clear aligners (42%) [ 31 ]; the Vincenzo’ sample torque for the central incisors and canines accounted for just 35% of movements [ 32 ]. These results showed that additional torque control of the incisors should be designed to increase the predictability of tooth movement.…”

Section: Discussionmentioning

confidence: 99%

The three-dimensional displacement tendency of teeth depending on incisor torque compensation with clear aligners of different thicknesses in cases of extraction: a finite element study

et al. 2022

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Background Despite the popularity of clear aligner treatment, the effect of the thickness of these aligners has not been fully investigated. The objective of this study was to assess the effects of incisor torque compensation with different thicknesses of clear aligner on the three-dimensional displacement tendency of teeth in cases of extraction. Methods Three-dimensional finite element models of the maxillary dentition with extracted first premolars, maxilla, periodontal ligaments, attachments, and aligners were constructed and subject to Finite Element Analysis (FEA). Two groups of models were created: (1) with 0.75 mm-thick aligners and (2) with 0.5 mm-thick aligners. A loading method was developed to simulate the action of clear aligners for the en masse retraction of the incisors. Power ridges of different heights were applied to both groups to mimic torque control, and the power ridges favoring the translation of the central incisors were selected. Then, we used ANSYS software to analyze the initial displacement of teeth and the principle stress on the PDL. Results Distal tipping, lingual tipping and extrusion of the incisors, distal tipping and extrusion of the canines, and mesial tipping and intrusion of the posterior teeth were all generated by clear aligner therapy. With the 0.5 mm-thick aligner, a power ridge of 0.7 mm could cause bodily retraction of the central incisors. With the 0.75 mm-thick aligner, a power ridge of 0.25 mm could cause translation of the central incisors. Aligner torque compensation created by the power ridges generated palatal root torque and intrusion of the incisors, intrusion of the canines, mesial tipping and the intrusion of the second premolar; these effects were more significant with a 0.75 mm-thick aligner. After torque compensation, the stress placed on the periodontal ligament of the incisors was distributed more evenly with the 0.75 mm-thick aligner. Conclusions The torque compensation caused by power ridges can achieve incisor intrusion and palatal root torque. Appropriate torque compensation with thicker aligners should be designed to ensure bodily retraction of anterior teeth and minimize root resorption, although more attention should be paid to the anchorage control of posterior teeth in cases of extraction.

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“…In recent years, clear aligners have become very popular for orthodontic treatment in adult patients, considering that they are more aesthetic, more comfortable and easier to manage in terms of both emergencies and oral hygiene as compared to braces [ 13 , 14 ]. Today, clear aligners are used to treat different malocclusions [ 15 , 16 ], thanks also to the improvement of auxiliaries and attachments and aligners materials [ 17 , 18 ], which allow the achievement of complex movements, such as rotation or torque [ 19 , 20 ]. However, there is a lack of literature describing the management of extractive cases using clear aligners, particularly with a single extraction in the lower arch.…”

Section: Introductionmentioning

confidence: 99%

Clear Aligners Treatment of Class III Subdivision with an Extraction of a Lower Bicuspid

D’Antò

Valletta

Simone

et al. 2023

IJERPH

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The aim of this study was to show a case of a Class III subdivision adult patient treated with clear aligners (CA) and the extraction of a lower bicuspid. A 19-year-old male with a class III canine and molar relationship on the right side and a deviation of lower dental midline to the left asked for an aesthetic treatment. He refused orthognathic surgical procedures, so he was offered a camouflage orthodontic treatment with the extraction of lower right first premolar to achieve a canine Class I relationship and to center the lower midline. The treatment was performed with clear aligners and the use of Class III elastics to maintain distal anchorage on the right side during the canine distalization. At the end of the treatment, the occlusal objectives were achieved.

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Evaluation of Tooth Movement Accuracy with Aligners: A Prospective Study

Cited by 30 publications

References 36 publications

Analysis of Maxillary First Molar Derotation with Invisalign Clear Aligners in Permanent Dentition

Analysis of Maxillary First Molar Derotation with Invisalign Clear Aligners in Permanent Dentition

The three-dimensional displacement tendency of teeth depending on incisor torque compensation with clear aligners of different thicknesses in cases of extraction: a finite element study

Clear Aligners Treatment of Class III Subdivision with an Extraction of a Lower Bicuspid

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