Analysis of the Changes in Occlusal Plane Inclination in a Class II Deep Bite “Teen” Patient Treated with Clear Aligners: A Case Report

Staderini, Edoardo; Ventura, Valentina; Meuli, Simonetta; Maltagliati, Liliana Ávila; Gallenzi, Patrizia

doi:10.3390/ijerph19020651

Cited by 10 publications

(7 citation statements)

References 14 publications

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“…The “bowing effect” seems to be inevitable. However, this phenomenon did not present in several clinical studies because of blockage of the adjacent teeth and coverage of the aligners [ 5 , 32 , 33 ]. Further studies are warranted to confirm these findings.…”

Section: Discussionmentioning

confidence: 99%

Effectiveness of the attachment position in molar intrusion with clear aligners: a finite element study

et al. 2022

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Objective To evaluate the biomechanical effects of different attachments’ position for maxillary molar intrusion with clear aligner treatment by finite element analysis. Methods Cone-beam computed tomography images of a patient with supra-eruption of the maxillary second molars were selected to construct three-dimensional models of the maxilla, periodontal ligaments, dentition, and clear aligner. The models were divided into four groups depending on the attachment location on the first molar: (1) no attachment (NA), (2) buccal attachment (BA), (3) palatal attachment (PA), and (4) bucco-palatal attachment (BPA). After applying an intrusion of 0.2 mm on the second molar, displacements and stress distributions of the teeth, aligner, and periodontal ligament were analyzed with the finite element software. Results All groups displayed equivalent movement patterns of aligners. The NA and BA groups showed buccal tipping of the second molar, while the PA group showed palatal tipping. The BPA group had the highest intruding value and the lowest buccal/palatal tipping value. All groups showed mesial tipping of the second molar. Stress distribution in the periodontal ligament strongly correlated with the attachment position. The BPA group showed the best stress distribution. Conclusion Combined BA and PA could effectively prevent buccal and palatal tipping and showed the best efficiency in intruding the second molar. The second molar showed an unavoidable tendency to tip mesially, regardless of the attachment position.

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Section: Discussionmentioning

confidence: 99%

Effectiveness of the attachment position in molar intrusion with clear aligners: a finite element study

et al. 2022

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“…Fan et al believe that the bowing effect is unavoidable [ 30 ]. However, this phenomenon does not necessarily occur in clinical settings [ 43 – 45 ].…”

Section: Discussionmentioning

confidence: 99%

Effect of clear aligner type on maxillary full-arch intrusion: 3D analysis using finite element method

Geramy,

Safari

2024

BMC Oral Health

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Background Vertical maxillary excess (VME) is one of the most common reasons for seeking orthodontic treatment. Total intrusion with aligners is a promising alternative to surgery in some cases. Considering the elastic deformation of aligners, this study aimed to evaluate the possible desirable and undesirable teeth displacements during full maxillary arch intrusion using clear aligners and temporary anchorage devices (TADs). Methods The maxillary arch and clear aligners were modeled in SolidWorks. Four aligner brands including Leon, Duran, Duran Plus, and Essix Plus were selected based on their material properties. Anterior and posterior intrusion forces of 80 and 300 g were applied from attachments between the canines and first premolars and between the first and second molars, respectively. Vertical and anteroposterior tooth displacements were determined. Results The greatest intrusion was recorded at the buccal of the second molar, followed by the first molar. The lowest value was measured at the palatal of the molars with all aligners except Duran, which indicated minimal intrusion in the central incisor. All teeth were mesially displaced at the incisal/occlusal except incisors that moved distally. All apices showed distal movement. Conclusions Total intrusion using clear aligners may be accompanied by other tooth movements, including buccal tipping and mesial-in rotation of the molars, retrusion of incisors, and mesial movement of other teeth.

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“…However, the treatment with clear aligners and intermaxillary elastics is unexplored in many aspects. The previous clinical literature analyzing this treatment method in molar distalization is prevalently made of several retrospective studies and case reports [ 8 , 26 ]. Several FE-based models about molar distalization with clear aligners only involved a single teeth or a single dentition, so that little attention was paid to the mandibular dentition.…”

Section: Discussionmentioning

confidence: 99%

“…In clinical conditions, clear aligners, as an overlay device, may avoid the undesirable vertical movement of Class II elastics caused by coverage of the entire dentition with the biting force. Thus, the mutual reinforcement of clear aligners and Class II elastics can facilitate the anchorage reinforcement in conjunction with vertical control [ 8 ]. A multicenter retrospective study conducted by Ravera et al [ 9 ] demonstrated that the combination of clear aligners with composite attachments and Class II elastics caused distalization of the maxillary first molars by 2.25 mm without remarkable tipping and vertical movements of the crown, and there was also good buccolingual control of the upper incisors with respect to the palatal plane.…”

Section: Introductionmentioning

confidence: 99%

Effects of upper-molar distalization using clear aligners in combination with Class II elastics: a three-dimensional finite element analysis

et al. 2022

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Introduction The effects of upper-molar distalization using clear aligners in combination with Class II elastics for anchorage reinforcement have not been fully investigated yet. The objective of this study is to analyze the movement and stress of the whole dentition and further explore guidelines for the selection of traction methods. Methods Three-dimensional (3D) finite element models are established to simulate the sequential molar distalization process, including the initial distalization of the 2nd molar (Set I) and the initial distalization of the 1st molar (Set II). Each group set features three models: a control model without Class II elastics (model A), Class II elastics attached to the tooth by buttons (model B), and Class II elastics attached to the aligner by precision cutting (model C). The 3D displacements, proclination angles, periodontal ligament (PDL) hydrostatic stress and alveolar bone von Mises stress in the anterior area are recorded. Results In all of the models, the maxillary anterior teeth are labial and mesial proclined, whereas the distal moving molars exhibit distal buccal inclination with an extrusion tendency. With the combination of Class II elastics, the anchorage was effectively reinforced; model C demonstrates superior anchorage reinforcement with lower stress distribution in comparison with model B. The upper canines in model B present an extrusion tendency. Meanwhile, the mandibular dentition in models B and C experience undesired movement tendencies with little discrepancy from each other. Conclusions Class II elastics are generally effective for anchorage reinforcement as the upper-molar distalization is performed with clear aligners. Class II elastics attached to an aligner by precision cutting is a superior alternative for maxillary anchorage control in cases that the proclination of upper incisors and extrusion of upper canines are unwanted.

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Analysis of the Changes in Occlusal Plane Inclination in a Class II Deep Bite “Teen” Patient Treated with Clear Aligners: A Case Report

Cited by 10 publications

References 14 publications

Effectiveness of the attachment position in molar intrusion with clear aligners: a finite element study

Effectiveness of the attachment position in molar intrusion with clear aligners: a finite element study

Effect of clear aligner type on maxillary full-arch intrusion: 3D analysis using finite element method

Effects of upper-molar distalization using clear aligners in combination with Class II elastics: a three-dimensional finite element analysis

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