Distalization of Maxillary and Mandibular Molars with TADs

Park, Jae Hyun; Bayome, Mohamed; Kook, Yoon‐Ah

doi:10.1002/9781119513636.ch16

Cited by 3 publications

(8 citation statements)

References 53 publications

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“…There are several options to produce posterior teeth en-masse distalization [ 24 , 25 ]. Assessment of anchorage type , en-masse teeth distalization anatomical movement limitations, overjet, and overbite implications are necessary.…”

Section: Discussionmentioning

confidence: 99%

Biomechanical analysis of total arch maxillary distalization using infrazygomatic crest miniscrews: a finite element analysis study

Schwertner,

de Almeida-Pedrin,

Poleti

et al. 2024

Prog Orthod.

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Aim To evaluate the maxillary incisors and canine’s immediate movement tendency using three different power arms (PA) height levels during total arch maxillary distalization supported on infrazygomatic crest (IZC) miniscrews according to finite element analysis (FEA). Methods Three finite element models of the maxilla were developed based on CBCT imaging of a teenage male patient presenting a Class II Division 1 malocclusion in the early permanent dentition. Maxillary complex, periodontium, orthodontic accessories, IZC miniscrews and an orthodontic wire were digitally created. The PAs were placed between canines and lateral incisors and projected at 4, 7, and 10 mm height distances. After that, distalization forces were simulated between PA and IZC miniscrews. Results The anterior teeth deformation produced in the FEA models was assessed according to a Von Mises equivalent. The stress was measured, revealing tendencies of initial maxillary teeth movement. No differences were found between the right and left sides. However, there was a significant difference among models in the under-stress areas, especially the apical and cervical root areas of the maxillary anterior teeth. More significant extrusion and lingual tipping of incisors were observed with the 4 mm power arm compared to the 7 mm and 10 mm ones. The 10 mm power arm did not show any tendency for extrusion of maxillary central incisors but a tendency for buccal tipping and intrusion of lateral incisors. Conclusion The maxillary incisors and canines have different immediate movement tendencies according to the height of the anterior point of the en-masse distalization force application. Based on the PA height increase, a change from lingual to buccal tipping and less extrusion tendency was observed for the incisors, while the lingual tipping and extrusion trend for canines increased.

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Section: Discussionmentioning

confidence: 99%

Biomechanical analysis of total arch maxillary distalization using infrazygomatic crest miniscrews: a finite element analysis study

Schwertner,

de Almeida-Pedrin,

Poleti

et al. 2024

Prog Orthod.

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“…This site is not reported to be used for the purpose of total dental arch mesialization, although it is a routine area for distalization by TADs. [ 6 ]…”

Section: Discussionmentioning

confidence: 99%

“…There are a plenty of studies reporting successful dental arch distalization in both the upper and lower arches. [ 6 10 ] Furthermore, there are studies with the mesialization of maxillary dentition using benefit system. [ 11 ] However, no study was found in the literature regarding total dental arch mesialization in the mandible using TADs, so this case report approach is innovative with this regard.…”

Section: Discussionmentioning

confidence: 99%

Retreatment of an orthognathic camouflaged case by total lower arch mesialization using temporary anchorage device

Hemmatpour

Oonchi

2021

Dental Research Journal

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Mandibular tooth extractions for camouflage treatments in borderline Class III patients may end up with unpleasing esthetic results which may lead the patient seeking further complicated retreatments. In this case report, we presented a patient's retreatment with a combined orthodontic and orthognathic surgery treatment plan. The treatment strategy involved an innovative temporary anchorage device (TAD)-based method for total mandibular arch mesialization instead of space reopening for first lower premolar replacement with implants. In the current case report, orthognathic management of a Class III adult female is discussed. The patient had a history of an esthetically unsuccessful previous camouflaged orthodontic treatment with two lower premolar extractions. She was prepared for orthognathic surgery using an innovative custom-made sliding jig based on miniscrews for total mandibular arch mesialization with the aim of dental arch decompensation. After gaining the optimal dental arch discrepancy, the patient had orthognathic surgery (maxillary advancement and mandibular setback and advancement genioplasty). Total mandibular dental arch mesialization with the aim of dental arch discrepancy preparation was successfully conducted using TADs. By means of the innovative miniscrew-anchored sliding jig, the patient's satisfactory esthetic and occlusal results were obtained in 22 months. With innovative application of the miniscrews, more practical and reasonable alternatives are available to replace conventional and complicated treatment plans such as space reopening for implants in patients with unsuccessful previous orthodontic therapies.

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“…Finite element analysis (FEA) has particularly useful applications in evaluating aspects of mini-implants used in orthodontics. 12 , 13 …”

Section: Introductionmentioning

confidence: 99%

“…Finite element analysis (FEA) has particularly useful applications in evaluating aspects of mini-implants used in orthodontics. 12,13 Both two-dimensional (2D) and three-dimensional (3D) stress analysis have been used to assess the dental implants. Many studies have made a comparison between the 3D and 2D FEA.…”

Section: Introductionmentioning

confidence: 99%

Comparative evaluation of displacement and stress distribution pattern during mandibular arch distalization with extra and inter-radicular mini-implants: a three-dimensional finite element study

MAHESHWARI,

CHAWDA,

KUSHWAH

et al. 2023

Dental Press J. Orthod.

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Objective: To compare the initial stress distribution and displacement on mandibular dentition using extra and inter-radicular mini-implants for arch distalization, by means of finite element analysis. Methods: For this study, two finite element models of the mandible were designed. The models consisted of periodontal ligament (PDL) and alveolar bone of all teeth until second molars. In the Case 1, bilateral extra-radicular buccal-shelf stainless steel mini-implants (10.0-mm length; 2.0-mm diameter) were placed between first and second permanent molars. In the Case 2, bilateral inter-radicular stainless steel mini-implants (10.0-mm length; 1.5-mm diameter) were placed between second premolar and first permanent molar. Power hook was attached between canine and first premolar at a fixed height of 8mm. In the two cases, 200g of distalization force was applied. ANSYS v. 12.1 software was used to analyze and compare von Mises stress and displacement in the mandibular dentition, PDL and bone. Results: Higher stresses were observed in mandibular dentition with the inter-radicular implant system. The amount of von Mises stress was higher for cortical bone (85.66MPa) and cancellous bone (3.64MPa) in Case 2, in comparison to cortical bone (41.93MPa) and cancellous bone (3.43MPa) in Case 1. The amount of arch distalization was higher for mandible in Case 1 (0.028mm), in comparison to Case 2 (0.026mm). Conclusion: Both systems were clinically safe, but extra-radicular implants showed more effective and controlled distalization pattern, in comparison to inter-radicular implants, in Class III malocclusion treatment.

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Distalization of Maxillary and Mandibular Molars with TADs

Cited by 3 publications

References 53 publications

Biomechanical analysis of total arch maxillary distalization using infrazygomatic crest miniscrews: a finite element analysis study

Biomechanical analysis of total arch maxillary distalization using infrazygomatic crest miniscrews: a finite element analysis study

Retreatment of an orthognathic camouflaged case by total lower arch mesialization using temporary anchorage device

Comparative evaluation of displacement and stress distribution pattern during mandibular arch distalization with extra and inter-radicular mini-implants: a three-dimensional finite element study

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