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Introduction Changes in breathing patterns affect the harmonious development of the structures of the craniofacial system, leading to changes in posture, occlusion, and facial growth patterns. However, little is known about how these changes influence the muscle contraction patterns, either at rest or while functioning, and either in a normal or unbalanced condition. Objective To study the masseter and anterior temporal muscles fatigue during mastication in nasal- and mouth-breathing children, also considering their facial growth patterns. Methods: A total of 70 children aged 6 to 12 years old who met the study criteria were assessed. Speech-language-hearing, otorhinolaryngologic, and cephalometric assessments were performed to divide them into groups. In the electromyographic assessment, the children were asked to chew gum following a metronome until they felt fatigued. The median frequency of the muscles was analyzed at 15, 30, 45, and 60 seconds of mastication. The reported time of fatigue perception was recorded. The data were analyzed with analysis of variance (ANOVA) and the Kruskal-Wallis and the Mann-Whitney U tests. Results There were no median frequency decrease patterns nor differences in the myoelectric manifestations and reported time of fatigue between the groups. Conclusion The masticatory muscles did not reveal fatigue in the electromyographic analysis; however, the fatigue time was reported, despite the absence of physiological fatigue. The breathing mode, the facial growth pattern, and the association between them did not interfere with the behavior of the median frequency of the electromyographic signal and the fatigue time perception.

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Abstract Introduction Changes in breathing patterns affect the harmonious development of the structures of the craniofacial system, leading to changes in posture, occlusion, and facial growth patterns. However, little is known about how these changes influence the muscle contraction patterns, either at rest or while functioning, and either in a normal or unbalanced condition. Objective To study the masseter and anterior temporal muscles fatigue during mastication in nasal- and mouth-breathing children, also considering their facial growth patterns. Methods: A total of 70 children aged 6 to 12 years old who met the study criteria were assessed. Speech-language-hearing, otorhinolaryngologic, and cephalometric assessments were performed to divide them into groups. In the electromyographic assessment, the children were asked to chew gum following a metronome until they felt fatigued. The median frequency of the muscles was analyzed at 15, 30, 45, and 60seconds of mastication.The reported time of fatigue perception was recorded. The data were analyzed with analysis of variance (ANOVA) and the Kruskal-Wallis and the Mann-Whitney U tests. Results There were no median frequency decrease patterns nor differences in the myoelectric manifestations and reported time of fatigue between the groups. Conclusion The masticatory muscles did not reveal fatigue in the electromyographic analysis; however, the fatigue time was reported, despite the absence of physiological fatigue. The breathing mode, the facial growth pattern, and the association between them did not interfere with the behavior of the median frequency of the electromyographic signal and the fatigue time perception.

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ABSTRACT Purpose To evaluate the agreement among instruments of the quantitative evaluation of hard palate. Methods This cross-sectional study was performed with a sample of 30 children aged 6 to 11 from Santa Maria, Southern Brazil. The instruments for palate measurements evaluated were: digital caliper, used directly in the oral cavity and in plaster casts, Korkhaus tridimensional bow, used directly in the oral cavity and in plaster casts, and Dolphin Imaging Software used for measurements in cone-beam computed tomography (CBCT). The agreement among different instruments was evaluated using the Intraclass Correlation Coefficient (ICC). Results The means of all transversal dimensions obtained by cone-beam computed tomography were lower than those of the other instruments - the agreement values in the width between the canines and in the width between the first molars were lower when comparing the cone-beam computed tomography and the other instruments. In the width between the first and second premolars, all comparisons showed acceptable agreement values. Good concordance values were obtained when comparing the palate depth at the second premolar region when using a bow divider inside the oral cavity and in the cast. Conclusion Most instruments presented satisfactory agreement in the measurements related to the transverse plane of the hard palate. However, when the vertical plane was evaluated, only the bow divider applied to both cast and oral cavity presented ideal agreement.

RESUMO Objetivo Avaliar a concordância entre instrumentos de avaliação quantitativa do palato duro. Método Este estudo transversal foi realizado com uma amostra de 30 crianças de 6 a 11 anos de Santa Maria, sul do Brasil. Os instrumentos de medidas do palato avaliados foram: paquímetro digital, utilizado diretamente na cavidade oral e em modelos de gesso, arco tridimensional Korkhaus, usado diretamente na cavidade oral e em modelos de gesso, e Dolphin Imaging Software utilizado para medições em tomografia computadorizada de feixe cônico (CBCT). A concordância entre os diferentes instrumentos foi avaliada por meio do Coeficiente de Correlação Intraclasse (ICC). Resultados As médias de todas as dimensões transversais obtidas pela tomografia computadorizada de feixe cônico foram menores do que as dos outros instrumentos - os valores de concordância na largura entre os caninos e na largura entre os primeiros molares foram baixos na comparação entre a tomografia computadorizada de feixe cônico e os demais instrumentos. Na largura entre o primeiro e o segundo pré-molar, todas as comparações apresentaram valores de concordância aceitáveis. Valores de concordância aceitáveis também foram obtidos ao comparar a profundidade do palato na região do segundo pré-molar com o uso de um divisor de arco dentro da cavidade oral e no gesso. Conclusão A maioria dos instrumentos apresentou concordância satisfatória nas medidas relacionadas ao plano transverso do palato duro. Porém, quando avaliado o plano vertical, apenas o divisor de arco aplicado tanto no gesso quanto na cavidade oral apresentou concordância ideal.

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ABSTRACT Purpose To evaluate the association among dimensions of the hard palate according to the sexes, skin color, and periods of the mixed dentition and present reference parameters of normality for this stage of development. Methods This cross-sectional study evaluated a representative sample of children between the ages of 7 and 13 years in Santa Maria, southern Brazil. The outcomes of the study were the dimensions of the palate: width measurements and depth. Sociodemographic characteristics and related oral measures were also assessed. Adjusted linear regression model were used to evaluate the effect of the predictor's variables on the dimensions of the hard palate in millimeters. The reference standards for the hard palate normality were presented in mean, standard deviation, and 95% confidence interval. Results A total of 569 children were evaluated. The hard palate dimensions were larger in the male sex and smaller in the first transitional period of mixed dentition. Skin color had an influence on the hard palate width at the level of the premolars, and the width measurements were smaller in white individuals. Posterior cross bite, Angle Class II and III malocclusions and non-nutritional sucking habits caused reduction in the hard palate width measurements. Conclusion Different dimensions of the hard palate are influenced by demographic variables such as sex, skin color, and mixed dentition period. Children of the female sex, white-skinned and in the first transition period of mixed dentition had smaller dimensions of the hard palate. Establishing normality reference standards in measurements of the palates guides the clinical practice.

RESUMO Objetivo Avaliar a associação entre as dimensões do palato duro de acordo com os sexos, cor da pele e períodos da dentição mista e apresentar parâmetros de normalidade de referência para esta fase de desenvolvimento. Método Este estudo transversal avaliou uma amostra representativa de crianças com idade entre 7 e 13 anos em Santa Maria, sul do Brasil. Os desfechos do estudo foram as dimensões do palato: medidas de largura e profundidade. Características sociodemográficas e medidas orais relacionadas também foram avaliadas. Modelos de regressão linear ajustados foram utilizados para avaliar o efeito das variáveis preditoras sobre as dimensões do palato duro em milímetros. Os padrões de referência para a normalidade do palato duro foram apresentados em média, desvio padrão e intervalo de confiança de 95%. Resultados Foram avaliadas 569 crianças. As dimensões do palato duro foram maiores no sexo masculino e menores no primeiro período de transição da dentição mista. A cor da pele influenciou a largura do palato duro ao nível dos pré-molares, sendo as medidas de largura menores nos brancos. Mordida cruzada posterior, más oclusões de Classe II e III de Angle e hábitos de sucção não nutricionais causaram redução nas medidas da largura do palato duro. Conclusão As diferentes dimensões do palato duro são influenciadas por variáveis demográficas como o sexo, cor da pele e período de dentição mista. Crianças do sexo feminino, de cor de pele branca e no primeiro período de transição de dentição mista apresentaram menores dimensões do palato duro. O estabelecimento de padrões de referência de normalidade nas medidas do palato orienta a prática clínica.

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PURPOSE: To evaluate the association among dimensions of the hard palate according to the sexes, skin color, and periods of the mixed dentition and present reference parameters of normality for this stage of development. METHODS: This cross-sectional study evaluated a representative sample of children between the ages of 7 and 13 years in Santa Maria, southern Brazil. The outcomes of the study were the dimensions of the palate: width measurements and depth. Sociodemographic characteristics and related oral measures were also assessed. Adjusted linear regression model were used to evaluate the effect of the predictor's variables on the dimensions of the hard palate in millimeters. The reference standards for the hard palate normality were presented in mean, standard deviation, and 95% confidence interval. RESULTS: A total of 569 children were evaluated. The hard palate dimensions were larger in the male sex and smaller in the first transitional period of mixed dentition. Skin color had an influence on the hard palate width at the level of the premolars, and the width measurements were smaller in white individuals. Posterior cross bite, Angle Class II and III malocclusions and non-nutritional sucking habits caused reduction in the hard palate width measurements. CONCLUSION: Different dimensions of the hard palate are influenced by demographic variables such as sex, skin color, and mixed dentition period. Children of the female sex, white-skinned and in the first transition period of mixed dentition had smaller dimensions of the hard palate. Establishing normality reference standards in measurements of the palates guides the clinical practice.

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PURPOSE: To evaluate the agreement among instruments of the quantitative evaluation of hard palate. METHODS: This cross-sectional study was performed with a sample of 30 children aged 6 to 11 from Santa Maria, Southern Brazil. The instruments for palate measurements evaluated were: digital caliper, used directly in the oral cavity and in plaster casts, Korkhaus tridimensional bow, used directly in the oral cavity and in plaster casts, and Dolphin Imaging Software used for measurements in cone-beam computed tomography (CBCT). The agreement among different instruments was evaluated using the Intraclass Correlation Coefficient (ICC). RESULTS: The means of all transversal dimensions obtained by cone-beam computed tomography were lower than those of the other instruments - the agreement values in the width between the canines and in the width between the first molars were lower when comparing the cone-beam computed tomography and the other instruments. In the width between the first and second premolars, all comparisons showed acceptable agreement values. Good concordance values were obtained when comparing the palate depth at the second premolar region when using a bow divider inside the oral cavity and in the cast. CONCLUSION: Most instruments presented satisfactory agreement in the measurements related to the transverse plane of the hard palate. However, when the vertical plane was evaluated, only the bow divider applied to both cast and oral cavity presented ideal agreement.

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Abstract Introduction: Nasal obstruction is a common symptom in childhood, related to rhinitis and pharyngeal tonsil hypertrophy. In the presence of nasal obstruction, nasal patency may be reduced, and nasal breathing is replaced by mouth breathing. Orofacial and otorhinolaryngologic changes are related to this breathing mode. Objective evaluation of upper airways may be obtained through nasal patency measurement. Objective: To compare nasal patency and otorhinolaryngologic-orofacial features in children. Methods: One hundred and twenty three children, 6-12 year-old, and of both sexes underwent speech therapy evaluation, according to Orofacial Myofunctional Evaluation protocol, clinical and endoscopic otorhinolaryngologic examination and nasal patency measurement, using the absolute and predicted (%) peak nasal inspiratory flow values. Results: Lower values of absolute and estimated peak nasal inspiratory flow values were found in children with restless sleep (p = 0.006 and p = 0.002), nasal obstruction report (p = 0.027 and p = 0.023), runny nose (p = 0.004 and p = 0.012), unsystematic lip closure during mastication (p = 0.040 and p = 0.026), masticatory speed reduced (p = 0.006 and p = 0.008) and altered solid food swallowing (p = 0.006 and p = 0.001). Absolute peak nasal inspiratory flow was lower in children with pale inferior turbinate (p = 0.040), reduced hard palate width (p = 0.037) and altered speech (p = 0.004). Higher absolute values were found in children with increased tongue width (p = 0.027) and, higher absolute and predicted (%) in children with mild everted lip (p = 0.008 and p = 0.000). Conclusions: Nasal patency was lower in children with restless sleep, rhinitis signs and symptoms, hard palate width reduced and with changes in mastication, deglutition and speech functions. It is also emphasized that most of the children presented signs and symptom of allergic rhinitis.

Resumo Introdução: A obstrução nasal é um sintoma comum na infância relacionado a rinite e hipertrofia das tonsilas faríngeas. Na presença de obstrução nasal, a patência nasal pode estar reduzida e a respiração nasal ser substituída por respiração oral. Alterações orofaciais e otorrinolaringológicas estão relacionadas a esse modo de respiração. A avaliação objetiva das vias aéreas superiores pode ser obtida através da medida da patência nasal. Objetivo: Comparar a patência nasal e características otorrinolaringológicas e orofaciais em crianças. Método: Foram submetidas 123 crianças de seis a 12 anos, de ambos os sexos, a avaliação fonoaudiológica, de acordo com o protocolo de avaliação Miofuncional Orofacial, exame clínico e endoscópico otorrinolaringológico e medição da patência nasal, com o uso do pico de fluxo inspiratório nasal em valores absolutos e valores estimados (% pico de fluxo inspiratório nasal). Resultados: Valores mais baixos de pico de fluxo inspiratório nasal e % pico de fluxo inspiratório nasal foram encontrados em crianças com sono agitado (p = 0,006 e p = 0,002), relato de obstrução nasal (p = 0,027 e p = 0,023), rinorreia (p = 0,004 e p = 0,012), fechamento não sistemático dos lábios durante a mastigação (p = 0,040 e p = 0,026), velocidade mastigatória reduzida (p = 0,006 e p = 0,008) e alteração da ingestão de alimentos sólidos (p = 0,006 e p = 0,001). O pico de fluxo inspiratório nasal foi menor em crianças com conchas inferiores pálidas (p = 0,040), redução da largura do palato duro (p = 0,037) e alterações da fala (p = 0,004). Valores maiores foram encontrados em crianças com largura da língua aumentada (p = 0,027). Valores maiores de pico de fluxo inspiratório nasal e % de pico de fluxo inspiratório nasal foram observados em crianças com lábio levemente evertido (p = 0,008 e p = 0,000). Conclusões: A patência nasal foi menor em crianças com sono agitado, sinais e sintomas de rinite, redução da largura do palato duro e alterações nas funções de mastigação, deglutição e fala. Enfatiza-se também que a maioria das crianças apresentava sinais e sintomas de rinite alérgica.

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INTRODUCTION: Nasal obstruction is a common symptom in childhood, related to rhinitis and pharyngeal tonsil hypertrophy. In the presence of nasal obstruction, nasal patency may be reduced, and nasal breathing is replaced by mouth breathing. Orofacial and otorhinolaryngologic changes are related to this breathing mode. Objective evaluation of upper airways may be obtained through nasal patency measurement. OBJECTIVE: To compare nasal patency and otorhinolaryngologic-orofacial features in children. METHODS: One hundred and twenty three children, 6-12 year-old, and of both sexes underwent speech therapy evaluation, according to Orofacial Myofunctional Evaluation protocol, clinical and endoscopic otorhinolaryngologic examination and nasal patency measurement, using the absolute and predicted (%) peak nasal inspiratory flow values. RESULTS: Lower values of absolute and estimated peak nasal inspiratory flow values were found in children with restless sleep (p=0.006 and p=0.002), nasal obstruction report (p=0.027 and p=0.023), runny nose (p=0.004 and p=0.012), unsystematic lip closure during mastication (p=0.040 and p=0.026), masticatory speed reduced (p=0.006 and p=0.008) and altered solid food swallowing (p=0.006 and p=0.001). Absolute peak nasal inspiratory flow was lower in children with pale inferior turbinate (p=0.040), reduced hard palate width (p=0.037) and altered speech (p=0.004). Higher absolute values were found in children with increased tongue width (p=0.027) and, higher absolute and predicted (%) in children with mild everted lip (p=0.008 and p=0.000). CONCLUSIONS: Nasal patency was lower in children with restless sleep, rhinitis signs and symptoms, hard palate width reduced and with changes in mastication, deglutition and speech functions. It is also emphasized that most of the children presented signs and symptom of allergic rhinitis.

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PURPOSE: : This study was conducted to identify variables associated with mouth breathing diagnosis in children, based on multidisciplinary domains. METHODS: 119 children, six to 12 years old, underwent anamnesis, speech therapy (orofacial structures and stomatognathic functions), otorhinolaryngologic (OTRL) with clinical and endoscopic examinations, dental (occlusion) and physiotherapy (body posture and nasal patency) assessments. Nasal patency was evaluated using Peak Nasal Inspiratory Flow (PNIF) and the Nasal Obstruction Symptom Evaluation (NOSE) scale. A multiple logistic regression was performed considering breathing mode as the dependent variable and the co-variables from each multidisciplinary assessment as associated variables. RESULTS: Association with MB diagnosis was found in each professional domain with: nasal obstruction report (Odds ratio - OR=5.55), time of pacifier use (OR=1.25), convex facial type (OR=3.78), obtuse nasal angle (OR=4.30), half-open or open lip posture (OR=4.13), tongue position on the mouth floor (OR=5.88), reduced hard palate width (OR=2.99), unexpected contraction during mastication (OR=2.97), obstructive pharyngeal tonsils (OR=8.37), Angle Class II malocclusion (OR=10.85) and regular gingival maintenance (OR=2.89). CONCLUSION: We concluded that a multidisciplinary diagnosis is important, given that each evaluation domain, including OTRL, dental and speech therapy, presented variables associated with MB diagnosis. Body posture and nasal patency variables were not associated with MB.

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Objetivo: Avaliar a função ventilatória, o pico de fluxo inspiratório nasal, as pressões respiratórias máximas, a atividade elétrica dos músculos inspiratórios acessórios e a relação entre as variáveis, em adultos com respiração oral (RO), comparando-os com adultos com respiração nasal (RN). Métodos: Estudo transversal, controlado com 77 participantes, entre 18 e 30 anos, ambos os sexos, distribuídos em Grupo RO (n = 38) e RN (n = 39). Foram avaliados por espirometria, manovacuometria, para obtenção da Pressão Inspiratória Máxima (PImáx) e Pressão Expiratória Máxima (PEmáx); medida do pico de fluxo inspiratório nasal (PFIN) e eletromiografia de superfície (EMG) dos músculos esternocleidomastoideo (ECM) e trapézio superior durante testes de PImáx e PFIN. Resultados: O grupo RO apresentou valores significativamente menores de PImáx (91 versus 100%), PEmáx (91,6 versus 102,6%) e PFIN (121,4 versus 147,7 l/min). Houve diferença (p < 0,01) na atividade EMG do ECM, com valores menores no grupo RO. A PImáx se correlacionou com o PFIN (r = 0,48, p < 0,01). Conclusão: Os RO apresentaram menores valores de PFIN, PImáx, PEmáx e de amplitude da atividade EMG dos músculos inspiratórios acessórios durante inspirações rápidas, quando comparados aos RN. Traz como contribuição para a prática clínica, a importância de uma investigação global do modo respiratório, não envolvendo apenas intervenções médicas, ortodônticas e miofuncionais, mas também os aspectos ventilatórios e musculares, sobre os quais se identificou a influência da RO. (AU)

Objective: To evaluate the ventilatory function, peak nasal inspiratory flow, respiratory muscle strength, electrical activity of the accessory inspiratory muscles and the relationship between the variables comparing mouth (MB) and nasal-breathing (NB) adults. Methods: Consisted in a cross-sectional, controlled study with 77 participants, between 18 and 30 years old, both sexes, distributed into MB (n=38) and NB (n=39) group. They were assessed by manovacuometry, for acquisition of the Maximal Inspiratory Pressure (MIP) and Maximal Expiratory Pressure (MEP) measures; peak nasal inspiratory flow meter (PNIF) and, surface electromyography (sEMG) of the of the sternocleidomastoid (ECM) and upper trapezius muscles, during MIP and PNIF. Results: The MB group presented values significantly lower on the MIP (91 versus 100%), MEP (91.6 versus 102.6%) and PNIF (121.4 versus 147.7 l/min). There was difference (p<0.01) in the ECM muscle activity, with lower values in the MB group. The MIP measure correlated to the PNIF (r=0.48, p<0.01). Conclusion: The adults MB presented smaller values of PNIF, MIP, MEP, and EMG amplitude of accessory inspiratory muscles during fast inspiration when compared to the NB. As a contribution to clinical practice, the importance of a global investigation of the respiratory mode, involving not only medical, orthodontic and myofunctional interventions, but also the ventilatory and muscular aspects, on which the influence of RO was identified. (AU)

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