Orthodontic biomechanics with intermaxillary elastics

Farret, Marcel Marchiori

doi:10.1590/2177-6709.28.3.e23spe3

Cited by 4 publications

(3 citation statements)

References 28 publications

(67 reference statements)

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“…However, this theory is not fully supported by others [19]. Especially during sequential distalization, the use of inter-arch elastics could extrude molars of the opposing arch [20,21] and increase the mandibular plane angle. Thus, the purpose of this study was to conduct a systematic review evaluating the size of dentoskeletal changes in the vertical dimension that result from sequential molar distalization in clear aligner therapy without TADs, and to provide clinical insight into the effectiveness and limitations when prescribing such treatments.…”

Section: Introductionmentioning

confidence: 93%

Vertical Control in Molar Distalization by Clear Aligners: A Systematic Review and Meta-Analysis

Park,

Shen,

Chung

et al. 2024

JCM

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Background: Molar distalization is used to correct molar relationships or to create space for mild anterior crowding. However, whether clear aligners can provide proper vertical control with the sequential distalization strategy has been highly debated. Thus, the current study aimed to systematically review the amount of dentoskeletal changes in the vertical dimension that results from sequential molar distalization in clear aligner therapy without temporary anchorage devices (TADs). Methods: Registered with PROSPERO (CRD42023447211), relevant original studies were screened from seven databases and supplemented by a manual search by two investigators independently. Articles were screened against inclusion and exclusion criteria, and a risk of bias assessment was conducted for each included article. Relevant data were extracted from the included articles and meta-analysis was performed using RStudio. Results: Eleven articles (nine for maxillary distalization and two for mandibular distalization) were selected for the final review. All studies have a high or medium risk of bias. For maxillary molar distalization, the meta-analysis revealed 0.26 mm [0.23 mm, 0.29 mm] of maxillary first molar intrusion based on post-distalization dental model analysis, as well as 0.50 mm [−0.78 mm, 1.78 mm] of maxillary first molar intrusion and 0.60 mm [−0.42 mm, 1.62 mm] of maxillary second molar intrusion based on post-treatment lateral cephalometric analysis. Skeletally, there was a −0.33° [−0.67°, 0.02°] change in the SN-GoGn angle, −0.23° [−0.30°, 0.75°] change in the SN-MP angle, and 0.09° [−0.83°, 1.01°] change in the PP-GoGn angle based on post-treatment lateral cephalometric analysis. There was insufficient data for meta-analysis for mandibular molar distalization. Conclusions: No significant changes in vertical dimension were observed, both dentally and skeletally, after maxillary molar distalization with a sequential distalization strategy. However, further studies on this topic are needed due to the high risk of bias in the currently available studies.

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Section: Introductionmentioning

confidence: 93%

Vertical Control in Molar Distalization by Clear Aligners: A Systematic Review and Meta-Analysis

Park,

Shen,

Chung

et al. 2024

JCM

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“…Another disadvantage, particularly in non-guided cases, is leverage created at the angle which can lead itself to an open bite. This is ameliorated by maintaining post-operative orthodontics for a slightly longer period, refraining from using anterior maxilla to posterior mandible elastic vectors for 4–6 months [ 87 ]; cutting the sling at the angle to minimize relapse [ 39 ], and patient dietary compliance for the first 6 weeks [ 88 ].…”

Section: Always Forward Thinkingmentioning

confidence: 99%

Hanna’s Modified Sagittal Split Osteotomy (HSSO): An Alternative to Inverted L Osteotomy—Merging Function and Aesthetics for Enhanced Stability, Attractiveness, and Nerve Protection

Hanna,

Bansal,

Ilesan

et al. 2024

JCM

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Background: The current high standards in orthognathic surgery demand surgical solutions that are both ⁠ functionally ⁠ effective and aesthetically pleasing. Our approach offers one for enhanced stability, attractiveness, and nerve protection ⁠ with improved accessibility ⁠ in the majority of orthognathic scenarios ⁠ compared to an inverted L osteotomy. Methods: A case series is presented to illustrate the application and outcomes of HSSO, an optimised approach that combines the advantages of a transoral inverted L osteotomy with specific enhancements and increased versatility, ⁠ with accessibility and exposure similar to a BSSO. Results: HSSO as a completely transoral technique, demonstrate the ability to perform significant counterclockwise rotations of the mandible, eliminating the need for trocars or skin incisions. We experinced high postoperative stability when HSSO was performed in conjunction with a three-piece LeFort 1 osteotomy on a dynamic opposing arch. In comparison to an inverted L approach, we postulated that HSSO offers advantages in stability, due to the increased segmental overlap of the proximal and distal segments of the mandible. This approach is designed to enhance the safety of the inferior alveolar nerve compared to traditional sagittal split methods. Furthermore, HSSO represents an alternative to total joint replacement in select cases of idiopathic condylar resorption and is effective for correcting mandibular asymmetries while maintaining jawline aesthetics. This is achieved through the manipulation of the mandibular angle, ramus height, and inferior border without creating a step deformity in the soft tissue. Conclusions: The outcomes of HSSO highlight its capacity to deliver predictable, functional, and aesthetically pleasing results, offering a viable alternative to more traditional orthognathic techniques.

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“…Moreover, coordinating dental arches is possible if a mild discrepancy between the upper and lower arch widths exists [1]. A mild sagittal discrepancy or a minimally open bite may be solved by the use of intermaxillary elastics [2]. More severe malocclusions resulting from a skeletal discrepancy may require a complex interdisciplinary treatment including dental alignment and a subsequent surgical intervention [3], and recently, artificial intelligence has been included in treatment planning [4,5].…”

Section: Introductionmentioning

confidence: 99%

Nanotomographic Analysis of Orthodontic Molar Tubes for Direct Bonding

Kłos,

Janiszewska-Olszowska,

Grocholewicz

2024

Applied Sciences

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(1) Background: The most important part of an orthodontic attachment (bracket or tube) is the tube or slot for the insertion of the orthodontic wire. Aligning teeth along the archwire according to angular values preadjusted in the bracket slots (or tubes) requires a very precise size accordance between the archwires and slots. The aim of this study was to perform a nanotomographic analysis of the geometric features of molar tubes for direct bonding in terms of their dimensions and angles of their inner walls and analyze the presence of metallurgic imperfections. (2) Methods: Orthodontic tubes (n = 100) for upper right first molars from five different manufacturers (3M-Victory Series, Adenta-Bond Sing, Dentaurum-Ortho Cast M, GC-L LP, and ORMCO-Accent), 20 tubes each, were subjected to nanotomographic analysis. Measurements of the inner channel of the tubes, angles between the walls, and analysis of metallurgic imperfections were performed using high-resolution computed tomography. (3) Results: height measurements differed by 4–14% from ideal values declared by manufacturers, whereas the angles ranged from reducing by a maximum 1% comparing to values declared (hypodivergent walls) to increasing by a maximum 4.5% (divergent walls). (4) Conclusions: 1. The sizes of channels measured were slightly larger than those declared by manufacturers. 2. Slight deviations in wall parallelism and angles between the walls were found. 3. Some tubes were characterized by manufacturing defects of the metal. 4. Efforts should be made to further improve the production process of orthodontic attachments.

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Orthodontic biomechanics with intermaxillary elastics

Cited by 4 publications

References 28 publications

Vertical Control in Molar Distalization by Clear Aligners: A Systematic Review and Meta-Analysis

Vertical Control in Molar Distalization by Clear Aligners: A Systematic Review and Meta-Analysis

Hanna’s Modified Sagittal Split Osteotomy (HSSO): An Alternative to Inverted L Osteotomy—Merging Function and Aesthetics for Enhanced Stability, Attractiveness, and Nerve Protection

Nanotomographic Analysis of Orthodontic Molar Tubes for Direct Bonding

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