Pronunciation of phonemes in relation to the degree of malocclusion and position of the incisal edges-lip vermilion border

Acoustic Measurements of Speech and Voice in Men with Angle Class II, Division 1, Malocclusion

“…Some studies 3 5 have pointed to the possibility of the articulatory organs, especially the lips and the tongue, to adapt to unfavourable bone and muscle conditions.…”

“…This fact is supported by a study 28 in which the authors observed a decrease in the nasopharynx, oropharynx and hypopharyngeal space in class II individuals when compared to participants with Angle class I malocclusion. Some studies 3,5 have pointed to the possibility of the articulatory organs, especially the lips and the tongue, to adapt to unfavourable bone and muscle conditions.…”

“…2 The interrelationship between speech disorders and dental malocclusions is described in the literature, as well as the fact that the lips and the tongue adapt to unfavourable bone and muscle conditions. [3][4][5] Voice production can also be influenced by changes in the facial skeleton and the position of the tongue, since there are correlations between voice frequency control and speech articulation. 6,7 Authors 2,4,8,9 describe that the most frequent speech disorders in Angle Class II are related to the sounds of the fricative [s] and [z] and bilabial [p], [b], [m] consonants.…”

Frequência fundamental e frequências dos dois primeiros formantes de vogais orais produzidas por adultos de acordo com as Classes ortodônticas de Angle

“…As faixas de frequências amplificadas são denominadas frequências dos formantes e as mais estudadas são as duas primeiras (F1 e F2) por fornecerem identidade fonética às vogais (Fant, 1960;Stevens e House, 1961;Lehiste, 1970;Johnson, 2003;Kent e Read, 2015;Barbosa e Madureira, 2015;Sundberg, 2018 (Sundberg, 2018). De acordo com a literatura, a frequência fundamental pode ser afetada por aspectos articulatórios devido às conexões existentes entre os músculos extrínsecos da língua e da laringe (Honda, 1981;Shaw et al, 2016 A inter-relação entre alterações de fala e más oclusões dentárias é descrita na literatura, assim como são mencionadas possibilidades dos órgãos fonoarticulatórios, em especial, lábios e língua, se adaptarem às condições ósseas e musculares desfavoráveis (Niemi et al, 2006;Hassan et al, 2007, Nájera et al, 2016 (Angle, 1907;Moyers, 1991 (Hassan et al, 2007;Coutinho et al, 2009;Mezzomo et al, 2011;Jesus et al, 2014 (Witzel et al, 1980;Lee et al, 2002).…”