Efficient Design of a Clear Aligner Attachment to Induce Bodily Tooth Movement in Orthodontic Treatment Using Finite Element Analysis

Hong, Kyungjae; Kim, Won-Hyeon; Eghan-Acquah, Emmanuel; Lee, Jong-Ho; Lee, Bu-Kyu; Kim, Bongju

doi:10.3390/ma14174926

Cited by 27 publications

(22 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considering that the intruded tooth was located in the most distal portion of the dentition, we chose the horizontal rectangular attachment with higher intrusion efficiency and set it on the adjacent tooth to obtain the best effect [23]. The effectiveness of rectangular attachments in tooth intrusion movement has been demonstrated in prior studies [24,25]. Moreover, only the intrusion side of the dentition was shown because the data on the non-intrusion side were insignificant and not the primary point of our study.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2022

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionmentioning

confidence: 99%

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

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Attachments offer retention, help the transmission of force from clear aligners to the teeth, and can support clear aligners to correct various teeth movements such as correction of crown tipping, axial rotation, and tooth translation. 25 The three types of attachments subjected to FEA simulation were rectangular attachment, ellipsoid attachment, and pyramidal attachment. The results showed that the minimum and maximum von Mises stress did not significantly differ among the three attachment configurations.…”

Section: Discussionmentioning

confidence: 99%

Effectiveness of the Attachment Design and Thickness of Clear Aligners during Orthodontic Anterior Retraction: Finite Element Analysis

2023

View full text Add to dashboard Cite

Objective Clear aligner treatment (CAT) provides orthodontic patients with a comfortable treatment alternative; however, this device has limited capacity to facilitate tooth movements. Although composite attachment has been proposed to facilitate tooth displacement, some of its aspects, such as aligner thickness, can influence CAT's precision. This work aimed to compare the stress distribution patterns produced by clear aligners with different thicknesses and composite attachment shapes during anterior retraction. Materials and Methods Maxillary models consisting of clear aligners, maxillary teeth, and various attachments to the upper central incisor's labial surface were generated. Three models were built to mimic the retraction of the upper central incisors. Each had a distinct attachment design (rectangular attachment, ellipsoid attachment, and pyramidal attachment) and various aligner thicknesses (0.75, 0.85, 0.95, 1.05, and 1.15 mm). Upper central incisor retraction was accomplished using clear aligners. Finite element analysis was used to examine the built models. Stress distribution pattern was examined. Results The greater the thickness of the aligner, the higher the stress experienced by the teeth. The 0.75 mm-thick aligner induces the lightest stress with a minimum of 0.0037623 MPa and a maximum of 0.32859 MPa. Meanwhile, the 1.5 mm-thick aligner has the highest stress with a minimum of 0.004679 MPa and a maximum of 0.43858 MPa. The force distribution on rectangular attachments appears evenly distributed. The maximum pressure force on rectangular attachments has a minimum of 0.38828 MPa, which is smaller than the maximum on ellipsoid and pyramidal attachments at 0.40933 and 0.45099 MPa, respectively. Conclusion The best aligner thickness is 0.75 to 0.85 mm for anterior retraction. An aligner with 0.95 mm thickness can still be used when a remarkable amount of tooth movement force is needed; however, this exception is only applicable to a limited number of clear aligner trays. The ellipsoid attachment is the best type of attachment because the resulting force is substantial and evenly distributed.

show abstract

“…Tooth alignment treated by buccolingual inclination of upper and lower incisors can produce satisfied clinical results [ 34 ]. Previously, a clear aligner was not effective enough for a complex force system to result in an intended tooth movement [ 35 ], because it was not as strong as braces in producing adequate occlusal contacts, controlling teeth torque and retention [ 36 ]. So it is desired to improve the overall usability of clear aligners, in particular, in the aspects of materials and aligner design.…”

Section: Discussionmentioning

confidence: 99%

‘Invisible’ orthodontics by polymeric ‘clear’ aligners molded on 3D-printed personalized dental models

Zheng³

et al. 2022

Regenerative Biomaterials

View full text Add to dashboard Cite

The malalignment of teeth is treated classically by metal braces with alloy wires, which has an unfavorable influence on the patients’ appearance during the treatment. Herein, a modern treatment was tried using clear polymeric aligners, which were fabricated by molding a film material on the three dimensional (3D) printed personalized dental models. The key parameters of photocurable 3D printing of dental models and the mechanical properties of the clear aligner film material were investigated. Following a series of 3D-printed personalized dental models and finite element analysis to predict and plan the fabrication and orthodontic processes, clear aligners were fabricated and applied in animal experiments to prove the efficacy and biocompatibility. A clinical treatment was finally carried out, which highlights the advantage of the clear aligners as an esthetic, compatible and efficient appliance.

show abstract

Efficient Design of a Clear Aligner Attachment to Induce Bodily Tooth Movement in Orthodontic Treatment Using Finite Element Analysis

Cited by 27 publications

References 42 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

Effectiveness of the Attachment Design and Thickness of Clear Aligners during Orthodontic Anterior Retraction: Finite Element Analysis

‘Invisible’ orthodontics by polymeric ‘clear’ aligners molded on 3D-printed personalized dental models

Contact Info

Product

Resources

About