Treatment with Twin-block appliance followed by fixed appliance therapy in a growing Class II patient

Lee, Keun-Young; Park, Jae Hyun; Tai, Kiyoshi; Chae, Jong‐Moon

doi:10.1016/j.ajodo.2015.10.033

Cited by 14 publications

(12 citation statements)

References 19 publications

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“…Class II malocclusion is one of the most common problems for which patients seek orthodontic treatment, and is a major and common challenge to orthodontists . Class II correction techniques include a variety of extraction protocols, palatal expansion mechanisms, extraoral traction, functional appliances and surgical repositioning of the jaws . The selection of appliances varies depending on the clinician's priorities, type of anomaly, patient's growth pattern, severity of the anteroposterior discrepancy, patient age and compliance …”

Section: Introductionmentioning

confidence: 99%

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Biomechanical analysis for total mesialization of the mandibular dentition: A finite element study

Kawamura

Park

Kojima³

et al. 2019

Orthod Craniofacial Res

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Objectives To clarify the mechanics of tooth movement in mesialization of the whole mandibular dentition when changing the force angulation. Setting A finite element method was used to simulate long‐term movements of the whole mandibular dentition. Material and methods Tooth movement was simulated by accumulating the initial displacement, which was produced by elastic deformation of the periodontal ligament. Mesial forces of 3 N were applied to the second molar bracket at −30°, −15°, 0°, 15° and 30° to the occlusal plane. Results The whole dentition and occlusal plane were rotated depending on the direction of the force with respect to the centre of resistance (CR). At a force angulation of −30°, the line of action of the force passed near the CR, and the whole dentition translated without rotation of the occlusal plane. The second molar tipped buccally due to a clearance gap between the archwire and bracket slot. When increasing a force angulation from −30°, the line of action of the force passed above the CR, and thereby, the occlusal plane rotated clockwise. This rotation of the whole dentition induced tipping of the individual teeth. Buccal tipping of the molar due to an elastic deformation of the archwire was prevented by using a lingually pre‐bent archwire. Conclusions Careful selection of force angulation and biomechanics is essential to obtain proper tooth movement in total mesialization of the mandibular dentition.

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Section: Introductionmentioning

confidence: 99%

“…Careful understanding of the biomechanics using TSADs could broaden the scope and boundaries of conventional fixed treatment. Various biomechanics have been applied to correct severe skeletal and dental Class II variations. However, the biomechanics for total mesialization of the mandibular dentition has rarely been studied.…”

Section: Introductionmentioning

confidence: 99%

Biomechanical analysis for total mesialization of the mandibular dentition: A finite element study

Kawamura

Park

Kojima³

et al. 2019

Orthod Craniofacial Res

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“…Many investigations revealed that the most significant effects of functional therapies are the dentoalveolar modifications (8) since these appliances are supported by teeth rather than the maxillary and mandibular bone. Placement of functional appliances causes displacement of condyle in the glenoid fossa, and stimulates growth of mandibular growth sites meaning condylar cartilage, condylar neck area and ramus (9). The efficacy of treatment highly depends on the growth potential and response of condylar cartilage and other mandibular growth sites (9,10).…”

Section: Introductionmentioning

confidence: 99%

“…Placement of functional appliances causes displacement of condyle in the glenoid fossa, and stimulates growth of mandibular growth sites meaning condylar cartilage, condylar neck area and ramus (9). The efficacy of treatment highly depends on the growth potential and response of condylar cartilage and other mandibular growth sites (9,10). Moreover, there is still controversy on whether growth modification actually increases the total mandibular length or it only increases the rate of the genetically expected amount of growth (9,11).…”

Section: Introductionmentioning

confidence: 99%

Dentoskeletal effects of class II malocclusion treatment with the modified Twin Block appliance

et al. 2019

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BackgroundThe purpose of this study was to prospectively assess the dentoskeletal effect of a modified Twin Block appliance for treatment of class II malocclusions.Material and MethodsLateral cephalograms of 25 Class II malocclusion patients were compared to evaluate skeletal, dentoalveolar and soft tissue changes pre- and post-treatment with a modified Twin Block appliance. A total of 33 angular and linear variables were used for analysis. The differences were calculated at the start and end of treatment. The paired T test was performed to compare the cephalometric measurements before and after treatment.ResultsCompared the pre- and post- treatment measurements, there was a significant increase in SNB (P<0.001), CO-Gn (P<0.001), ANS-Me (P=0.001), Mandibular base (P<0.001), Lower 1 to NB (°) (P=0.004), Lower 1 to NB (mm) (P<0.001), and Z-angle (P=0.001) following functional therapy with modified Twin Block appliance. On the other hand, a significant decrease was observed in ANB (P<0.001), NA-Pog (P<0.001), overjet (P<0.001), and overbite (P=0.007), Upper 1 to palatal plane (P=0.007), UL-E-line (P<0.001), LL-E-line (P=0.001), and H-angle (P=0.002) after treatment with modified Twin Block appliance.ConclusionsThe modified Twin-Block improves facial esthetics in Class II malocclusion by a combination of changes in skeletal as well as dentoalveolar structures. The increase of mandibular unit length was observed to be due to a true mandibular growth not just a repositioning of the mandible. The modified appliance, however, did not show any superior effects in terms of less dental compensation compared to the conventional Twin–Block appliance. Key words:Dentoskeletal effect, Modified Twin Block, Class II malocclusion.

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“…This effect is beneficial in the correction of Class II malocclusion, since the functional appliances exert forces forward and downward in the anteroinferior region, as consequence of the increase of the vertical development and mesialization of the mandibular molar, besides helping in the leveling of the curve of Spee. 42,43 The increase in the vertical development of the mandibular molars has already been described in other occasions in the literature. 20,24 Dental relationship:…”

Section: Maxillary Dentoalveolar Componentmentioning

confidence: 56%

Class II malocclusion treatment with twin block and mandibular anterior repositioning appliance: a comparative study of dentoskeletal changes

Bastiani¹,

Henriques²

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A "Gi" (Gislaine), você terá minha eterna gratidão por tanto carinho com minha família. Muito obrigada por cada dia que passou cuidando da minha filha para eu poder estudar, por cada palavra de apoio quando você me via desesperada. Você é muito especial em mim. Ao meu estimado e querido Orientador Prof. Dr. José Fernando Castanha Henriques. Me sinto imensamente horada por ter o senhor como orientador ao longo dessa caminhada, essa foi uma das melhores partes. Poder encontrar e conviver quase todos os dias com o senhor naquele ambiente extraordinário é algo que jamais vou esquecer. O seu exemplo de serenidade, segurança e carinho é algo que levarei como exemplo para minha vida. Gostaria muito de ter o senhor sempre por perto. Muito obrigada pela paciência e por cada palavra de conforto. Que nossos caminhos ainda se cruzem muito.

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Treatment with Twin-block appliance followed by fixed appliance therapy in a growing Class II patient

Cited by 14 publications

References 19 publications

Biomechanical analysis for total mesialization of the mandibular dentition: A finite element study

Biomechanical analysis for total mesialization of the mandibular dentition: A finite element study

Dentoskeletal effects of class II malocclusion treatment with the modified Twin Block appliance

Class II malocclusion treatment with twin block and mandibular anterior repositioning appliance: a comparative study of dentoskeletal changes

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