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Comparative Study
. 2014 Nov-Dec;19(6):46-53.
doi: 10.1590/2176-9451.19.6.046-053.oar.

Björk-Jarabak cephalometric analysis on CBCT synthesized cephalograms with different dentofacial sagittal skeletal patterns

Yalil Augusto Rodriguez-Cardenas  1 , Luis Ernesto Arriola-Guillen  2 , Carlos Flores-Mir  3
Affiliations
Comparative Study

Björk-Jarabak cephalometric analysis on CBCT synthesized cephalograms with different dentofacial sagittal skeletal patterns

Yalil Augusto Rodriguez-Cardenas et al. Dental Press J Orthod. 2014 Nov-Dec.

Abstract
in English, Portuguese

Objective: The objective of this study was to evaluate the Björk and Jabarak cephalometric analysis generated from cone-beam computed tomography (CBCT) synthesized lateral cephalograms in adults with different sagittal skeletal patterns.

Methods: The sample consisted of 46 CBCT synthesized cephalograms obtained from patients between 16 and 40 years old. A Björk and Jarabak cephalometric analysis among different sagittal skeletal classes was performed. Analysis of variance (ANOVA), multiple range test of Tukey, Kruskal-Wallis test, and independent t-test were used as appropriate.

Results: In comparison to the standard values: Skeletal Class III had increased gonial and superior gonial angles (P < 0.001). This trend was also evident when sex was considered. For Class I males, the sella angle was decreased (P = 0.041), articular angle increased (P = 0.027) and gonial angle decreased (P = 0.002); whereas for Class III males, the gonial angle was increased (P = 0.012). For Class I females, the articular angle was increased (P = 0.029) and the gonial angle decreased (P = 0.004). Björk's sum and Björk and Jabarak polygon sum showed no significant differences. The facial biotype presented in the three sagittal classes was mainly hypodivergent and neutral.

Conclusions: In this sample, skeletal Class III malocclusion was strongly differentiated from the other sagittal classes, specifically in the mandible, as calculated through Björk and Jarabak analysis.

OBJETIVO:: o objetivo deste estudo foi avaliar a análise cefalométrica de Björk-Jarabak realizada com base em telerradiografias sintetizadas a partir de tomografia computadorizada de feixe cônico (TCFC) em adultos com diferentes padrões esqueléticos sagitais.

MÉTODOS:: a amostra foi composta de 46 telerradiografias sintetizadas a partir de TCFC obtidas de pacientes entre 16 e 40 anos de idade. A análise cefalométrica de Björk-Jarabak foi conduzida entre as diferentes classes esqueléticas sagitais. Análise de variância (ANOVA), teste de Tukey, de Kruskal-Wallis e teste t independente também foram realizados.

RESULTADOS:: em comparação a valores padrão, a má oclusão de Classe III esquelética apresentava ângulos goníacos aumentados (p < 0,001). Essa tendência também foi evidente quando o sexo dos pacientes foi considerado. Pacientes Classe I do sexo masculino tiveram o ângulo sela diminuído (p = 0,041), o ângulo articular aumentado (p = 0,027) e o ângulo goníaco também diminuído (p = 0,002). Já os pacientes Classe III tiveram o ângulo goníaco aumentado (p = 0,012). Pacientes Classe I do sexo feminino tiveram o ângulo articular aumentado (p = 0,029) e o ângulo goníaco diminuído (p = 0,004). A soma de Björk e a soma dos polígonos de Björk-Jarabak não revelaram diferenças significativas. O biótipo facial presente nas três classes sagitais foi hipodivergente e neutro.

CONCLUSÕES:: na amostra do presente estudo, a má oclusão esquelética de Classe III foi fortemente diferenciada de outras classes sagitais, principalmente na mandíbula, conforme demonstrado pela análise de Björk-Jarabak.

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Figures

Figure 1.
Figure 1.. Example of CBCT cephalogram used in this study.
Figure 2.
Figure 2.. Angular and linear parameters for Björk and Jarabak analysis used in this study.
See this image and copyright information in PMC

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