Multivariate prediction of skeletal Class II growth

Rudolph, David J.; White, Stewart E.; Sinclair, Peter M.

doi:10.1016/s0889-5406(98)70210-0

Cited by 21 publications

(20 citation statements)

References 19 publications

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“…Errors did not exceed 1.0 mm for any of the distance-related values, or 1.0% for any of the ratio-related values except Glabella-Subnasion/ Subnasion-Menton (G-Sn:Sn-Me) (2.0%). The results were similar to those reported previously,27,28 confi rming the reproducibility of measurement in this study for all hard and soft tissue values. Data from the fi rst run was used for analysis.ResultsCluster analysisResults of the cluster analysis of the 41 hard tissue values and 30 soft tissue values in males and females are shown in Figs.2-5.…”

supporting

confidence: 92%

A study on craniofacial morphology of Japanese subjects with normal occlusion and esthetic profile

Nakahara

2007

Odontology

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This study was designed to properly characterize the cephalometric values of Japanese individuals with both normal occlusion and esthetic profiles. Multivariate statistics were applied to analyze the collected data. Cephalometric values identified are expected to help in the simplification of orthodontic diagnosis. Lateral cephalometric radiographs from 50 men and 50 women with normal occlusion were traced and the dimensions of hard and soft tissues recorded. The corresponding values were classified by cluster analysis, and selected representative values were subjected to principal component analysis. From these values, characteristics of hard and soft tissue morphology were extracted. The subjects were grouped by sex, and subdivided into esthetic and unesthetic profile groups. The principal component scores from each group were plotted on a scattergram and the characteristics of each group investigated. The hard tissue characteristics in men with esthetic profiles were primarily vertical factors, including a tendency for smaller lower facial heights, a smaller mandibular plane angle, and a larger Nasion-ANS/ANS-Menton (N-ANS/ANS-Me). Soft tissue features included a more posteriorly placed maxilla and a high nasal crest. These features yield a less marked maxillary prognathism and a greater nose prominence. In females, hard tissue characteristics associated with esthetic profiles primarily involved the cranial base and posterior facial area. These included a smaller saddle angle, larger articulare angle, and smaller Sella-Articulare/Articlare-Gonion (S-Ar/Ar-Go). Female soft tissue characteristics primarily included retracted upper and lower lips, a shallow inferior sulcus with a smaller lower lip-Frankfort plane angle, and a shorter mentolabial sulcus and subnasale perpendicular-upper lip.

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confidence: 92%

A study on craniofacial morphology of Japanese subjects with normal occlusion and esthetic profile

Nakahara

2007

Odontology

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“…Ao discorrer sobre o crescimento, a literatura impõe múltiplos pontos de vista acerca de quando, quanto e como a mandíbula cresce no Padrão II, mas tudo no campo da imprevisibilidade. A previsão de quantificar incrementos, ou mesmo a antevisão matemática da rotação mandibular durante o crescimento, ainda representa possibilidade remota, a despeito de iniciativas pertinentes 11,30 . De fato, isso não se aplica somente ao Padrão II, mas um aspecto merece ênfase: a diversidade da literatura quanto ao padrão dentofacial na Classe II deve-se em parte aos critérios de diagnóstico da amostra e em parte à imperfeição inerente com que os números cefalométricos traduzem a face.…”

Section: Discussionunclassified

“…Embora a magnitude de crescimento mandibular no Padrão II apresente considerável variação individual e dentro de cada indivíduo anualmente 23 , o que não difere do crescimento padrão normal quando avaliada pelo ângulo SNB, a mandíbula preserva a sua posição sagital na face 17 , ou mostra pequena redução 27 ou aumento 4,13,14,22 . Essa variabilidade no comportamento sagital da mandíbula justifica a variação dos ângulos de convexidade, como o ângulo ANB, que podem manter-se 13,27,30,37 , reduzir-se 5,14,28,30,37 ou aumentar-se 14 .…”

Section: Introdução E Revisão De Literatura Sobre O Crescimento Esponunclassified

Crescimento facial espontâneo Padrão II: estudo cefalométrico longitudinal

Filho¹,

Bertóz

Filho³

et al. 2009

Rev. Dent. Press Ortodon. Ortop. Facial

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OBJETIVO: o presente estudo cefalométrico longitudinal investigou as alterações espontâneas ocorridas em crianças com má oclusão Classe II, divisão 1, Padrão II. MÉTODOS: foram selecionadas 40 crianças, 20 meninos e 20 meninas, distribuídas na faixa etária compreendida entre 6 e 14 anos de idade. Para avaliar o comportamento das bases apicais, dos incisivos e do tecido mole, as seguintes grandezas cefalométricas foram mensuradas: SN.Ba, SNA, SNB, SND, SN.Pog, ANB, NAP, SN.PP, SN.GoGn, SN.Gn, Ar.Go.Gn, 1.PP, 1.NA, 1.SN, IMPA e ANL. As seguintes grandezas alcançaram significância estatística com o crescimento: SNB, SND,SN.Pog,ANB,NAP,SN.GoGn,SN.Gn,Ar.Go.Gn e IMPA. RESULTADOS: os resultados demonstraram que as principais alterações quantitativas registradas estavam relacionadas com o crescimento mandibular,independentemente do gênero. A mandíbula deslocou-se para frente, com tendência de rotação no sentido anti-horário e com conseqüente redução nos ângulos de convexidade facial. No entanto, as oscilações quantitativas nas grandezas cefalométricas não foram suficientes para mudar a morfologia dentofacial ao longo do período de acompanhamento. CONCLUSÃO: conclui-se, portanto, que a morfologia facial é definida precocemente e é mantida, configurando o determinismo genético na determinação do arcabouço esquelético.

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“…25 In another paper Rudolph states that if serial cephalometric head films can be taken around ages 6, 8, 10, and 12, then good growers can be separated from poor growers. 50 Turchetta 51 concludes that it still remains difficult to accurately predict the future growth of each individual patient. However, Schulhof 52 uses computerized cephalometrics to obtain parameter that suggest a patient will grow into a Class III malocclusion.…”

Section: Growth Prediction and Its Role In Treatment Of Class III Indmentioning

confidence: 99%

Class III correction using an inter-arch spring loaded module

VanLaecken¹

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To determine the skeletal and dental changes seen in the sagittal, vertical, and angular directions in a group of patients who had undergone treatment with an inter-arch spring loaded module, the CS2000® appliance. Methods: The treatment group consisted of 30 patients treated in the private practice office of Dr. Michael Williams in Gulfport, MS, (15 males, 15 females) with an average pre-treatment age of 9.6 and post-treatment age of 10.9. The average treatment time for the pooled group studied was 1.3 years. Lateral cephalometric films were collected from pre-treatment records before treatment began and from post-treatment records after CS2000® appliance removal. The two radiographs were then compared to allow a final calculation of average total effect seen by the CS2000® appliance in addition to normal growth of each patient during the treatment time prescribed. Results: Significant sagittal, vertical, and angular changes were seen between the pre-treatment and post-treatment. The maxillary base was found to move 1.5 mm forward, while the mandibular base moved 1.5 mm posterior. ANB and Wits measurements improved a significant level throughout treatment as well. The maxillary incisor moved forward 2.6 mm while the mandibular incisor only move 0.6 mm forward. The maxillary molar moved 1.2 mm forward while the mandibular molar moved 0.6 mm posterior. These sagittal, vertical, and angular changes contributed to the overjet and molar relationship correction. The average overjet correction found a skeletal contribution of 60 % and a 40% dental contribution. The molar relationship correction found a 62% skeletal influence a 38 % dental contribution. Conclusions: The CS 2000 appliance produces its correction by protraction of the maxillary base, proclination of the maxillary incisors, extrusion of the maxillary molars and mandibular incisors which rotates the occlusal plane in a counterclockwise direction, retraction of the mandibular base (partially coming from a downward and back rotation) mesialization of the maxillary molars, and distalization of the mandibular molars. iv ACKNOWLEDEMENTS Dr. Peter Ngan-Thank you so much for all your help and guidance throughout the last three years. I feel truly blessed to have had the opportunity to learn from the best. Everything great about this program stems from you awesome leadership. Thank you for all you do. Dr. Chris Martin-Thank you for each and every day you spent with us in the clinic. I will miss our daily banter and yes, will still be there to mow your grass…next time.. Thank you for your humor and keeping things light around the clinic. You will be missed. Dr. Thomas Razmus-Thank you for serving on my research committee and your help over the last three years. Dr. Michael Williams-Thank you for the use of your records in my research project. Dr. Erdogan Gunel-Thank you for your timely calculations of my statistics. Your work is greatly appreciated.

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Multivariate prediction of skeletal Class II growth

Cited by 21 publications

References 19 publications

A study on craniofacial morphology of Japanese subjects with normal occlusion and esthetic profile

A study on craniofacial morphology of Japanese subjects with normal occlusion and esthetic profile

Crescimento facial espontâneo Padrão II: estudo cefalométrico longitudinal

Class III correction using an inter-arch spring loaded module

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