Tarcísio N. Câmara - Tanaka e Johnston
Autor: COPP | Publicado: 2012-08-22T11:11:00-07:00

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Tarcísio N. Câmara - CRO - 4552




Cirurgião-dentista -&nbsp;UFC

Pós-graduando em Ortodontia -&nbsp;COPP / UVA

Extensionista em Ortodontia -&nbsp;COPP / UVA






Durante a análise da dentição mista, muitas vezes não
podemos medir diretamente as dimensões dos caninos e pré-molares, pois estes
ainda não estão erupcionados. Isto dificulta a mensuração do espaço requerido
pelos dentes em processo eruptivo. Visando resolver este problema, Tanaka e
Johnston conseguiram relacionar a largura dos caninos e pré-molares inferiores
com as dimensões dos incisivos inferiores segundo a fórmula:



Σ 3,4,5 =&nbsp; Σii + 10,5

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2

onde:



Σ 3,4,5 = somatório da dimensão mésio-distal
de pré-molares e canino de cada hemi-arco.



Σii =&nbsp;
somatório das dimensões mésio-distais dos incisivos inferiores.



A partir desta
equação, obtemos uma mensuração aproximada das dimensões dos pré-molares e do
canino ainda não erupcionados. o espaço ocupado pelos pré-molares e canino (Σ
3,4,5) &nbsp;multiplicado por dois (pois temos
pré-molares e caninos do lado esquerdo e direito), acrescido do espaço ocupado
pelos incisivos (Σii), representam o espaço requerido para comportar incisivos,
caninos e pré-molares:

ER = (Σ 3,4,5 x 2) + Σii

Determinado o espaço
requerido, avaliamos o espaço presente (EP) que vai da mesial do primeiro molar
inferior esquerdo à mesial do primeiro molar inferior direito.

A discrepância de modelo será então
determinada pelo espaço presente subtraído pelo espaço requerido:



DM = EP - ER



A discrepância cefalométrica de Tweed
deve também ser avaliada no cálculo da discrepância total. Considerando-se as
exceções:



a) linha z passando dentro do nariz

b) PFH/AFH ≥ 0,72



Quando constatada a presença de uma
destas exceções, diminuímos a DC em 50%. Quando ambas estão presentes
desconsideramos o completamente a discrepância cefalométrica. As exceções só
devem ser consideradas quando a DC for negativa.

para o cálculo da discrepância total,
somamos a discrepância de modelo (DM)e a discrepância cefalométrica (DC)
considerando-se as exceções.



Elaboramos uma planilha no Excel para
facilitar o cálculo e diminuir a probabilidade de erros durante a determinação
da discrepância de modelos de Tanaka e Johnston.






Quem desejar a planilha sem custos, entre em contato por e-mail para: pedro@copp.com.br ou contato@copp.com.br

Em seguida receberá o arquivo com senha para uso.



www.copp.com.br











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