Morphometric analysis of treatment effects of the Balters bionator in growing Class II patients

Antunes, Carina Ferlin; Bigliazzi, Renato; Bertóz, Francisco Antônio; Ortolani, Cristina Lúcia Feijó; Franchi, Lorenzo; Faltin, Kurt

doi:10.2319/072512-605.1

Cited by 15 publications

(26 citation statements)

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“…New methods of geometric morphometrics, based on the analysis of landmark configurations, permit further in-depth investigation of morphologic processes pro- duced by FJO. 18 Among these new alternatives, TPS analysis allows the possibility of analyzing size and shape changes in a ''size-free'' shape space. 16,17 It enables easy, comprehensible graphical representation of changes in shape, while clearly highlighting the regions where these changes occur.…”

Section: Discussionmentioning

confidence: 99%

“…The matrix of Procrustes residuals can be used for any statistical procedure. 18,22 Sample size calculation for both groups was determined in order to have more specimens than the number of partial warps plus the number of independent variables. In order to perform multivariate tests of significance, the sample sizes must be large enough so that the error degrees of freedom are equal to or larger than the number of dependent variables.…”

Section: Tps Analysis Of Bionator Therapymentioning

confidence: 99%

“…16,17 It also allows the construction of transformation grids that capture differences in form, enabling a more effective visual interpretation and mathematical representations of treatment effects. 16 Antunes et al 18 analyzed by means TPS analysis the short-term effects of the standard Balters bionator in growing patients with Class II malocclusion with mandibular retrusion. TPS analysis showed that treatment with the bionator is able to produce favorable mandibular shape changes that contributed significantly to the correction of the Class II dentoskeletal imbalance.…”

Section: Introductionmentioning

confidence: 99%

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Morphometric analysis of long-term dentoskeletal effects induced by treatment with Balters bionator

Bigliazzi

Franchi

Bertoz

et al. 2014

The Angle Orthodontist

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Objective: To evaluate the long-term effects of the standard (Class II) Balters bionator in growing patients with Class II malocclusion with mandibular retrusion by using morphometrics (thin-plate spline [TPS] analysis). Materials and Methods: Twenty-three Class II patients (8 male, 15 female) were treated consecutively with the Balters bionator (bionator group). The sample was evaluated at T0, start of treatment; T1, end of bionator therapy; and T2, long-term observation (including fixed appliances). Mean age at the start of treatment was 10 years 2 months (T0); at posttreatment, 12 years 3 months (T1); and at long-term follow-up, 18 years 2 months (T2). The control group consisted of 22 subjects (11 male, 11 female) with untreated Class II malocclusion. Lateral cephalograms were analyzed at the three time points for all groups. TPS analysis evaluated statistical differences (permutation tests) in the craniofacial shape and size between the bionator and control groups. Results: TPS analysis showed that treatment with the bionator is able to produce favorable mandibular shape changes (forward and downward displacement) that contribute significantly to the correction of the Class II dentoskeletal imbalance. These results are maintained at a long-term observation after completion of growth. The control group showed no statistically significant differences in the correction of Class II malocclusion. Conclusions: This study suggests that bionator treatment of Class II malocclusion produces favorable results over the long term with a combination of skeletal and dentoalveolar shape changes. (Angle Orthod. 2015;85:790-798.)

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Section: Discussionmentioning

confidence: 99%

Section: Tps Analysis Of Bionator Therapymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Morphometric analysis of long-term dentoskeletal effects induced by treatment with Balters bionator

Bigliazzi

Franchi

Bertoz

et al. 2014

The Angle Orthodontist

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“…Some authors claim that action of functional appliances is largely, if not completely, confined to the dentoalveolar structures (Devincenzo, 1991;Martins et al, 2008). Other authors believe that, in addition to inducing dentoalveolar changes, appliance may also alter maxillary and mandibular skeletal relationship during growth (Luder, 1981;Antunes et al, 2013). Tables 2 and 3 show that out of the twenty-two variables utilized in this study, five of dental and four of skeletal variables showed statistically significant difference.…”

Section: Discussionmentioning

confidence: 84%

Skeletal and Dental Changes Induced by Bionator in Early Treatment of Class Ii

Raveli

Schwartz

Raveli

et al. 2016

Acta Sci. Health Sci.

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ABSTRACT. The purpose was to investigate the amount of skeletal and dentoalveolar changes after early treatment of Class II, Division 1 malocclusion with bionator appliance in prepubertal growing patients. Forty Class II patients were divided in two groups. Treated group consisted of 20 subjects treated consecutively with bionator. Mean age at the start of treatment (T0) was 9.1 years, while it was 10.6 years at the end of treatment (T1). Mean treatment time was 17.7 months. Pretreatment and post-treatment cephalometric records of treated group were evaluated and compared with a control group consisted of 20 patients with untreated Class II malocclusion. Intergroup comparisons were performed using Student's ttests and chi-square test with Yates' correction at a significance level of 5 per cent. Bionator appliance was effective in generating differential growth between the jaws. Cephalometric skeletal measurements ANB, WITS, Lafh, Co-A and dental L6-Mp, U1.Pp, IsIi, OB, OJ showed statistically significantly different from the control. Bionator induced more dentoalveolar changes than skeletal during treatment in prepubertal stage.Keywords: activator appliances, malocclusion, cephalometry.Alterações esqueléticas e dentárias induzidas pelo bionator no tratamento precoce da classe II RESUMO. Este estudo quantificou as alterações esqueléticas e dentoalveolares no período pré-puberal de crescimento após o tratamento da má oclusão de classe II, divisão 1 com bionator. Quarenta pacientes classe II foram divididos em dois grupos. Um grupo com 20 pacientes tratados consecutivamente com bionator. A média de idade no início do tratamento (T0) foi de 9,1 anos, enquanto ao final (T1) foi de 10,6 anos. O tempo médio de tratamento foi de 17,7 meses. Os dados cefalométricos antes e após o tratamento foram avaliados e comparados com um grupo controle de 20 pacientes com má oclusão de classe II, divisão 1 não tratada. A comparação intergrupo foi realizada pelo teste t de Student e teste qui-quadrado com correção de Yates para um nível de significância de 5 por cento. O aparelho foi efetivo em gerar diferencial de crescimento entre os arcos dentários. As medidas cefalométricas esqueléticas ANB, WITS, Lafh, Co-A e as dentárias L6-Mp, U1.Pp, IsIi, OB, OJ demonstraram diferença estatística significante entre os grupos. O bionator induziu maiores alterações dentoalveolares que esqueléticas no tratamento da classe II, divisão 1 durante o período pré-puberal.Palavras-chave: aparelhos ativadores, má oclusão, circunferência craniana.

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“…This morphometric analysis quantitatively evaluates changes in shape, expressing the differences between the configurations of two reference points as a continuous deformation. It also allows the construction of transformation grids that capture differences in form, enabling a more effective visual interpretation (Antunes, Bigliazzi, Bertoz, Ortolani, Franchi, & Faltin, 2013;Bigliazzi, Franchi, Bertoz, McNamara, Faltin, & Bertoz, 2015). Thus, TPS allows precise viewing of the set of changes occurring in facial skeletal structures (Franchi, Pavoni, Faltin, Bigliazzi, Gazzani, & Cozza,, 2016).…”

Section: Introductionmentioning

confidence: 99%

<b>Morphometric analysis of three normal facial types in mixed dentition using posteroanterior cephalometric radiographs: preliminary results

Bigliazzi

Walverde²,

Oliveira

et al. 2017

Acta Sci. Health Sci.

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ABSTRACT. The aim of the present investigation was to evaluate the craniofacial features of subjects with normal occlusion with different vertical patterns in the mixed dentition using morphometric analysis (Thin-Plate Spline analysis -TPS) applied to posteroanterior (PA) films. The sample comprised 39 individuals (18 females and 21 males), all in mixed dentition, aged from 8.4 to 10 years with satisfactory occlusion and balanced profile and with no history of orthodontic or facial orthopedic treatment. The sample was divided into three groups (mesofacial, brachyfacial and dolichofacial) according to the facial types proposed by Ricketts (1989). The average craniofacial configurations of each study group were obtained by orthogonal superimposition of Procrustes, thereby eliminating size differences and allowing only shape differences between groups to be analyzed by viewing the TPS deformation grid. Significant differences were found among the three facial types but were more remarkable between mesofacials and dolichofacials than between mesofacials and brachyfacials. TPS morphometric analysis proved efficient for accurate visualization of transverse and vertical differences among facial types even before pubertal growth spurt. These differences cannot be easily detected by traditional posteroanterior cephalometry.Keywords: morphometry, orthodontics, facial type, posteroanterior radiograph.Análise morfométrica dos três tipos faciais normais na dentição mista utilizando radiografias cefalométricas póstero-anteriores: resultados preliminares RESUMO. O objetivo da presente investigação foi avaliar as características craniofaciais de indivíduos com oclusão normal e diferentes padrões verticais na dentição mista, utilizando a análise morfométrica (análise Thin-Plate Spline -TPS) aplicada em radiografias póstero-anteriores. A amostra foi composta de 39 indivíduos (18 meninas e 21 meninos), todos com dentição mista, com idades variando entre 8, 4 e 10 anos, com oclusão satisfatória e perfil balanceado e sem histórico de tratamento ortodôntico ou ortopédico. A amostra foi dividida em três grupos (mesofacial, braquifacial e dolicofacial) de acordo com os tipos faciais propostos por Ricketts (1989). As configurações craniofaciais médias de cada grupo em estudo foram obtidas pela sobreposição ortogonal de Procrustes, eliminando, dessa maneira, diferenças de tamanho e permitindo analisar separadamente as diferenças de forma pela visualização das grades de deformação da análise de TPS. Diferenças significativas foram encontradas entre os três tipos faciais, mas foram mais marcantes entre os dolicofaciais e os mesofaciais do que entre os mesofaciais e os braquifaciais. A análise morfométrica TPS provou ser eficiente para a acurada visualização das diferenças transversais e verticais entre os tipos faciais, mesmo antes do pico de crescimento puberal. Essas diferenças não podem ser facilmente detectáveis pela cefalometria póstero-anterior tradicional.

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Morphometric analysis of treatment effects of the Balters bionator in growing Class II patients

Cited by 15 publications

References 15 publications

Morphometric analysis of long-term dentoskeletal effects induced by treatment with Balters bionator

Morphometric analysis of long-term dentoskeletal effects induced by treatment with Balters bionator

Skeletal and Dental Changes Induced by Bionator in Early Treatment of Class Ii

<b>Morphometric analysis of three normal facial types in mixed dentition using posteroanterior cephalometric radiographs: preliminary results

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