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1.
Arch Oral Biol ; 122: 104985, 2021 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-33340921

RESUMEN

OBJECTIVE: To detect the long-term response to unilateral anterior crossbite (UAC) in masticatory muscles and in molecular biomarkers of peripheral blood leukocytes. DESIGN: Fifty-six six-week-old Sprague-Dawley rats were used. The gene-fold changes in peripheral blood leukocytes were detected by the microarray analysis to compare the rats that received 20-week UAC treatment with age-matched controls (n = 4). Muscle atrophy-related gene Fbxo32 was selected based on the data of the microarray analysis verified by using real-time PCR. The remaining 36 rats were randomly separated in the UAC and control groups at 12 and 20 weeks (n = 12). The protein expression of Fbxo32 and the muscle injury and myogenesis-related markers, αB-crystallin and desmin, were detected in the masseter and lateral pterygoid muscles by western blot assay. RESULTS: In the 20-week UAC group, the masseter muscle weight was lower than that in the age-matched control group, and the expression level of Fbxo32 gene in peripheral blood leukocytes was increased according to the microarray analysis confirmed by real-time PCR detection. The increased protein expression levels of Fbxo32 were detected in the masseter in the 20-week UAC group, and the protein expression levels of desmin and αB-crystallin were decreased at this time point. No similar changes were detected in the lateral pterygoid muscle. CONCLUSIONS: Masseter atrophy is induced by long-term stimulation of UAC. The increased expression of the Fbxo32 gene in peripheral blood leukocytes may be a candidate biological marker of masseter atrophy.


Asunto(s)
Maloclusión/fisiopatología , Músculo Masetero/fisiopatología , Animales , Leucocitos Mononucleares , Proteínas Musculares/metabolismo , Músculos Pterigoideos , Ratas , Ratas Sprague-Dawley , Proteínas Ligasas SKP Cullina F-box/metabolismo
2.
Braz Oral Res ; 34: e059, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32578802

RESUMEN

The aim of this study was to evaluate the association of malocclusion, nutritive and non-nutritive sucking habits and dental caries in the masticatory function of preschool children. A cross-sectional study was conducted with a sample of 384 children aged 3-5 years. A single examiner calibrated for oral clinical examinations performed all the evaluations (kappa > 0.82). Presence of malocclusion was recorded using Foster and Hamilton criteria. The number of masticatory units and of posterior teeth cavitated by dental caries was also recorded. The parents answered a questionnaire in the form of an interview, addressing questions about the child's nutritive and non-nutritive sucking habits. The masticatory function was evaluated using Optocal test material, and was based on the median particle size in the masticatory performance, on the swallowing threshold, and on the number of masticatory cycles during the swallowing threshold. Data analysis involved simple and multiple linear regression analyses, and the confidence level adopted was 95%. The sample consisted of 206 children in the malocclusion group and 178 in the non-malocclusion group. In the multiple regression analysis, the masticatory performance was associated with age (p = 0.025), bottle feeding (p = 0.004), presence of malocclusion (p = 0.048) and number of cavitated posterior teeth (p = 0.030). The swallowing threshold was associated with age (p = 0.025), bottle feeding (p = 0.001) and posterior malocclusion (p = 0.017). The number of masticatory cycles during the swallowing threshold was associated with the number of cavitated posterior teeth (p = 0.001). In conclusion, posterior malocclusion, bottle feeding and dental caries may interfere in the masticatory function of preschool children.


Asunto(s)
Deglución/fisiología , Caries Dental/fisiopatología , Maloclusión/fisiopatología , Masticación/fisiología , Conducta en la Lactancia/fisiología , Alimentación Artificial , Lactancia Materna , Preescolar , Estudios Transversales , Femenino , Succión del Dedo , Humanos , Modelos Lineales , Masculino , Tamaño de la Partícula , Valores de Referencia , Factores Sexuales , Estadísticas no Paramétricas
3.
Comput Methods Biomech Biomed Engin ; 23(10): 627-641, 2020 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-32400179

RESUMEN

The evaluation of temporomandibular joint (TMJ) dysfunction using finite element models is a time consuming process that requires extensive technical knowledge. We combined a statistical active appearance model with automated modelling algorithms to biomechanically study the relationship between TMJ malformations and dysfunction in radiographs from 20 paediatric patients with unilateral crossbite. A fitting algorithm (fitting error < 4%) recognised the TMJ shape and adjusted the dimensions of each patient-specific 2D FE model, which was then used to compute 2 different joint movements. Significant functional differences were observed between the crossbite and non-cross bite sides, and the shape-function relation was verified.


Asunto(s)
Análisis de Elementos Finitos , Maloclusión/fisiopatología , Modelación Específica para el Paciente , Articulación Temporomandibular/fisiopatología , Algoritmos , Automatización , Niño , Femenino , Humanos , Masculino , Estrés Mecánico
4.
J Appl Oral Sci ; 28: e20190399, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32348443

RESUMEN

Objectives To evaluate the acoustic properties of the /s/ sound in individuals with different occlusion types and to investigate relationships between these properties and cephalometric measurements. Methodology Sixty patients were divided into three groups based on malocclusion. Group 1 included 20 patients (mean age: 14.85±2.01 years) with Class I skeletal and dental relationships. Group 2 included 20 patients (mean age: 13.49±1.78 years) with Class II skeletal and dental relationships. Group 3 included 20 patients (mean age: 12.46±2.62 years) with Class III skeletal and dental relationships. Cephalometric tracings were obtained from cephalometric radiographs. All included patients were native speakers of Turkish. The /s/ sound was selected for center of gravity analysis. Correlations between cephalometric values and acoustic parameters were also investigated. Results The center of gravity of the /s/ sound had the lowest value in Group 2 (p<0.05). For the /s/ sound in Group 3, moderate positive correlations were found between center of gravity and Sella-Nasion to Gonion-Gnathion angle (p<0.05, r=0.444) Lower incisor to Nasion-B point (p<0.023, r=0.505), and Lower incisor to Nasion-B point angle (p<0.034; r=0.476). No correlation was found in other cephalometric measurements. Conclusions The /s/ sound was affected by malocclusion due to the changing place of articulation. Therefore, referral to an orthodontist for malocclusion treatment especially patients with class III in the early period is suggested for producing acoustically ideal sound.


Asunto(s)
Cefalometría , Maloclusión/fisiopatología , Acústica del Lenguaje , Trastornos del Habla/fisiopatología , Adolescente , Niño , Femenino , Humanos , Masculino , Maloclusión/complicaciones , Maloclusión/diagnóstico por imagen , Mandíbula/anatomía & histología , Mandíbula/fisiopatología , Maxilar/anatomía & histología , Maxilar/fisiopatología , Estudios Prospectivos , Radiografía , Valores de Referencia , Trastornos del Habla/diagnóstico por imagen , Trastornos del Habla/etiología , Estadísticas no Paramétricas , Lengua/anatomía & histología , Lengua/fisiopatología , Turquia
5.
J. appl. oral sci ; 28: e20190399, 2020. tab, graf
Artículo en Inglés | LILACS, BBO - Odontología | ID: biblio-1101253

RESUMEN

Abstract Objectives To evaluate the acoustic properties of the /s/ sound in individuals with different occlusion types and to investigate relationships between these properties and cephalometric measurements. Methodology Sixty patients were divided into three groups based on malocclusion. Group 1 included 20 patients (mean age: 14.85±2.01 years) with Class I skeletal and dental relationships. Group 2 included 20 patients (mean age: 13.49±1.78 years) with Class II skeletal and dental relationships. Group 3 included 20 patients (mean age: 12.46±2.62 years) with Class III skeletal and dental relationships. Cephalometric tracings were obtained from cephalometric radiographs. All included patients were native speakers of Turkish. The /s/ sound was selected for center of gravity analysis. Correlations between cephalometric values and acoustic parameters were also investigated. Results The center of gravity of the /s/ sound had the lowest value in Group 2 (p<0.05). For the /s/ sound in Group 3, moderate positive correlations were found between center of gravity and Sella-Nasion to Gonion-Gnathion angle (p<0.05, r=0.444) Lower incisor to Nasion-B point (p<0.023, r=0.505), and Lower incisor to Nasion-B point angle (p<0.034; r=0.476). No correlation was found in other cephalometric measurements. Conclusions The /s/ sound was affected by malocclusion due to the changing place of articulation. Therefore, referral to an orthodontist for malocclusion treatment especially patients with class III in the early period is suggested for producing acoustically ideal sound.


Asunto(s)
Humanos , Masculino , Femenino , Niño , Adolescente , Acústica del Lenguaje , Trastornos del Habla/fisiopatología , Cefalometría , Maloclusión/fisiopatología , Valores de Referencia , Trastornos del Habla/etiología , Trastornos del Habla/diagnóstico por imagen , Lengua/anatomía & histología , Lengua/fisiopatología , Turquia , Radiografía , Estudios Prospectivos , Estadísticas no Paramétricas , Maloclusión/complicaciones , Maloclusión/diagnóstico por imagen , Mandíbula/anatomía & histología , Mandíbula/fisiopatología , Maxilar/anatomía & histología , Maxilar/fisiopatología
6.
Am J Orthod Dentofacial Orthop ; 156(4): 493-501, 2019 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-31582121

RESUMEN

INTRODUCTION: The purpose of this research was to evaluate dental compensation in facial asymmetry and its correlation with skeletal variables using cone-beam computed tomography. METHODS: Sixty adult patients were retrospectively divided into asymmetry (mean age, 21.8 ± 5.4 years) and symmetry groups (mean age, 28.1 ± 4.1 years); both groups comprised 30 patients. Independent and paired t tests were used for comparisons between the asymmetry and symmetry groups and between deviated (Dv) and nondeviated (NDv) sides of the asymmetry group, respectively. Pearson correlation between dental and skeletal variables was performed. RESULTS: The mean value of menton deviation was 9.4 mm in the asymmetry group. Compared with the symmetry group, the direction and amount of dental compensation of the asymmetry group were as follows: 2.5-mm extrusion of the maxillary first molar (UM6) at NDv (P <0.05); 1.8-mm higher position of the mandibular canine (LC) from the mandibular horizontal plane using mental foramen (MHP_mf) at NDv (P <0.05); 6°-more buccoversion of UM6 at Dv; 3.7°-more linguoversion of UM6 at NDv; 4.8°-more buccoversion of the maxillary canine (UC) at Dv; 4.9°-more buccoversion of the mandibular molar (LM6) at NDv; and 2.6°-more linguoversion of LC at Dv. Dental compensation correlated or marginally correlated with skeletal variables of the deviated mandible. CONCLUSIONS: Dental compensations, extrusion of the maxillary molars on the NDv, and buccal tipping of the maxillary teeth and lingual tipping of the mandibular teeth on the Dv, were observed. The mandibular body length was associated with linguoversion of the mandibular molars on the Dv. The ramal inclination was related to the extrusion of the maxillary molars on the NDv.


Asunto(s)
Cefalometría/métodos , Tomografía Computarizada de Haz Cónico/métodos , Asimetría Facial/diagnóstico por imagen , Maloclusión/diagnóstico por imagen , Diente Molar/diagnóstico por imagen , Adolescente , Adulto , Estética Dental , Asimetría Facial/fisiopatología , Femenino , Humanos , Imagenología Tridimensional/métodos , Masculino , Maloclusión/fisiopatología , Persona de Mediana Edad , Diente Molar/fisiopatología , Estudios Retrospectivos
7.
Med Arch ; 73(2): 113-117, 2019 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-31391699

RESUMEN

Introduction: Malocclusion as an oral disorder can cause negative impact on individuals oral conditions, social interactions and self-esteem. Aim: The aim of this study was to compare oral health-related quality of life (OHQoL) of patients who had received fixed orthodontic treatment and patients who had not received fixed orthodontic treatment. Materials and Methods: Data were collected from 178 participants attended at professional dental office (mean age 22.71 years) in two groups (experimental and control). The experimental group comprised of 90 subjects who were in the retention phase, after their orthodontic treatment, and the control group comprised of 88 untreated subjects. Oral Health Impact Profile (OHIP-14) was used to assess the patients oral health related quality of life (OHQoL). Results: The control group had significantly higher OHIP-14 scores than experimental group (p < 0.001). Participants with treatment need reported a significantly greater negative impact on the overall OHRQoL score. Conclusion: Subjects with no history of orthodontic treatment had more negative oral health related quality (OHRQoL), than subjects who had completed orthodontic treatment. Dental malocclusion has significant negative impact on OHRQoL.


Asunto(s)
Maloclusión/fisiopatología , Maloclusión/psicología , Salud Bucal , Ortodoncia Correctiva , Calidad de Vida , Estudios de Casos y Controles , Femenino , Humanos , Masculino , Maloclusión/terapia , Aparatos Ortodóncicos Fijos , Adulto Joven
8.
Am J Orthod Dentofacial Orthop ; 156(2): 178-185, 2019 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-31375227

RESUMEN

INTRODUCTION: This study aimed to identify significant factors affecting the spontaneous angular changes of impacted mandibular third molars as a result of second molar protraction. Temporary skeletal anchorage devices in the missing mandibular first molar (ML-6) or missing deciduous mandibular second molar (ML-E) with missing succedaneous premolar spaces provided traction. METHODS: Forty-one mandibular third molars of 34 patients (10 male and 24 female; mean age 18.3 ± 3.7 years) that erupted after second molar protraction were included in this study. They were classified into upright (U) and tilted (T) groups. Linear and angular measurements were performed at the time of treatment initiation (T1) and of ML-6 or ML-E space closure (T2). Regression analyses were used to identify significant factors related to third molar uprighting. RESULTS: Nolla stage (odds ratio [OR] 4.1), sex (OR 0.003 for male), third molar angulation at T1 (OR 1.1), missing tooth space (OR 0.006), rate of third molar eruption (OR 23.3), and rate of second molar protraction (OR 0.2) significantly affected third molar uprighting. Age, third molar angulation at T1, rate of third molar eruption, and rate of second molar protraction were significant factors for predicting third molar angulation at T2. CONCLUSIONS: Available space for third molar eruption before and after second molar protraction is not associated with uprighting of erupting third molars. Older patients whose third molars are in greater Nolla stage, are in a more upright position at T1, and have a greater eruption rate have a greater chance for third molar uprighting. Alternatively, an increase in second molar protraction rate results in mesial tipping of the third molars.


Asunto(s)
Maloclusión/prevención & control , Maloclusión/fisiopatología , Mandíbula/fisiopatología , Tercer Molar/fisiopatología , Diente Impactado/fisiopatología , Adolescente , Adulto , Puntos Anatómicos de Referencia , Diente Premolar , Femenino , Humanos , Masculino , Maloclusión/diagnóstico por imagen , Mandíbula/anatomía & histología , Mandíbula/diagnóstico por imagen , Diente Molar/anatomía & histología , Diente Molar/diagnóstico por imagen , Diente Molar/fisiopatología , Tercer Molar/anatomía & histología , Tercer Molar/diagnóstico por imagen , Aparatos Ortodóncicos , Cierre del Espacio Ortodóncico , Ortodoncia Correctiva , Erupción Dental , Diente Primario , Diente Impactado/complicaciones , Diente Impactado/diagnóstico por imagen , Adulto Joven
9.
Clin Exp Dent Res ; 5(3): 199-204, 2019 06.
Artículo en Inglés | MEDLINE | ID: mdl-31249699

RESUMEN

This study aims to evaluate the prevalence of occlusal traits and to assess parents'/caregivers' satisfaction with child's dental appearance and perception of orthodontic treatment need in 4-5-year-old Estonians. Clinical records and plaster casts of 390 children (190 girls and 200 boys, mean age 4.7 years, range 4 - 5 years) were analyzed. Assessed occlusal traits included deciduous canine and second molar sagittal relationship, overjet, overbite, crowding, midline diastema, crossbite, and scissor bite. Parents'/caregivers' opinions regarding their child's teeth were determined with a questionnaire. The most prevalent occlusal traits were symmetrical sagittal relationship in deciduous canines (78.2%) and molars (75.1%), Class I sagittal relationship in deciduous canines (69.7%) and midline diastema (67.7%). Asymmetrical sagittal canine relationship was registered in 21.8% deciduous canines and in 24.9% second deciduous molars. Parents'/caregivers' perceived orthodontic treatment need was related to Class III sagittal relationship in canines, increased overjet and overbite, negative overbite, and crossbite. Prevalence of most occlusal traits in Estonian children were in line with those reported in neighboring countries. Parents/caregivers were well able to observe occlusal traits that deviated from acceptable occlusion.


Asunto(s)
Maloclusión/fisiopatología , Ortodoncia Correctiva , Padres , Satisfacción Personal , Apariencia Física , Preescolar , Estonia , Femenino , Humanos , Indice de Necesidad de Tratamiento Ortodóncico , Masculino , Maloclusión/terapia , Maloclusión de Angle Clase I/fisiopatología , Maloclusión de Angle Clase I/terapia , Maloclusión de Angle Clase II/fisiopatología , Maloclusión de Angle Clase II/terapia , Maloclusión de Angle Clase III/fisiopatología , Maloclusión de Angle Clase III/terapia , Evaluación de Necesidades , Sobremordida/fisiopatología , Sobremordida/terapia
10.
J Oral Rehabil ; 46(4): 388-397, 2019 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-30664820

RESUMEN

BACKGROUND: In the past few years, growing interest was given to the relationship between the dental occlusion and the body balance. While most research focused on this relationship at static conditions, it is evident that the contribution of the sensory information for balance control is different depending on the environmental constraints. RESEARCH QUESTION: The aim of the present paper was to elucidate whether the stomatognathic system (SS) contributes differently on body balance regulation according to the presence of external disturbances. METHODS: Literature regarding the different sources involved in the proprioceptive information to the SS was reviewed. The influence of dental occlusion on balance control at different external environments was then explored. RESULTS: The main findings are: (a) a plausible evidence between the masticatory and cervical muscles can be described; (b) a reciprocal connection between the trigeminal and vestibular nuclei supports the influence of the SS on body balance; (c) traditionally, research involving the relationship between the SS and balance control has focused on strictly controlled situations, thus, ignoring the sensory reweighting which occurs depending on the external disturbances; and (d) the afferences of dental occlusion for balance control seem strengthened when more difficult conditions are present. CONCLUSION: Results of the present review suggest that afferent signals from dental occlusion effectively contribute to balance control when more external perturbations are present, that is unstable support surface, fatigue and tasks being performed. However, more studies are needed to elucidate the mechanisms by which dental occlusion may influence balance control focusing on different external environments.


Asunto(s)
Oclusión Dental , Fatiga/fisiopatología , Maloclusión/fisiopatología , Equilibrio Postural/fisiología , Sistema Estomatognático/fisiopatología , Fenómenos Biomecánicos , Lateralidad Funcional/fisiología , Humanos
11.
J Oral Rehabil ; 46(4): 321-329, 2019 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-30472807

RESUMEN

BACKGROUND: Temporomandibular disorders (TMDs) are frequent and disabling, and hence, preventing them is an important health issue. Combining orthodontic and surgical treatments for malocclusions has been shown to affect temporomandibular joint (TMJ) health. However, publications regarding the risk factors that predict negative TMJ outcomes after orthognathic surgery are scarce. OBJECTIVE: Present prospective cohort study was conducted to identify an association between pre-operative dysfunctional/parafunctional oral habits and the presence of TMD symptoms after orthognathic surgery. METHOD: We included 237 patients undergoing orthodontics and surgical treatment for malocclusions associated with dentofacial deformities within the Department of Oral and Maxillofacial Surgery of the University of Lille. Their parafunctional and dysfunctional oral habits were recorded through clinical examination along with the presence of TMD symptoms before and after the surgery. According to the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) classification, the TMD symptoms studied were myalgia, arthralgia, disc displacement with or without reduction. RESULTS: Multivariate analysis revealed significant associations among bruxism (odds ratio [OR] 3.17 [1.066; 9.432]), lingual interposition (OR 4.241 [1.351; 13.313]), as well as primary swallowing (OR 3.54 [1.225; 10.234]) and the presence of postoperative symptoms of myalgia. Moreover, a significant association was observed between the presence of any dysfunctional oral habit and postoperative disc displacement with reduction (OR 4.611 [1.249; 17.021]). CONCLUSION: Bruxism and dysfunctional oral habits were shown to be risk factors for the presence of TMD symptoms also after combined orthodontic and surgical treatment. Treating such habits before orthognathic surgery should help prevent TMD.


Asunto(s)
Bruxismo/cirugía , Maloclusión/cirugía , Cirugía Ortognática , Complicaciones Posoperatorias/fisiopatología , Trastornos de la Articulación Temporomandibular/fisiopatología , Adolescente , Adulto , Anciano , Bruxismo/complicaciones , Bruxismo/epidemiología , Bruxismo/fisiopatología , Femenino , Francia/epidemiología , Hábitos , Humanos , Masculino , Maloclusión/complicaciones , Maloclusión/epidemiología , Maloclusión/fisiopatología , Persona de Mediana Edad , Complicaciones Posoperatorias/epidemiología , Estudios Prospectivos , Factores de Riesgo , Trastornos de la Articulación Temporomandibular/epidemiología , Trastornos de la Articulación Temporomandibular/etiología , Adulto Joven
12.
Eur J Orthod ; 41(1): 46-53, 2019 01 23.
Artículo en Inglés | MEDLINE | ID: mdl-29688483

RESUMEN

Objectives: The relationship between unilateral posterior crossbite (UPCB) and the possible asymmetric activation of the jaw muscles in children is still under debate. This study aimed at evaluating the jaw muscle activity of children with UPCB before and after rapid maxillary expansion (RME) by means of surface electromyography and a standardized sampling protocol. Subjects and methods: Twenty-nine children with UPCB (UPCB-group, mean age 9.6 ± 1.6 years) and 40 UPCB-free controls (Control-group, 10.5 ± 1.1) were recruited. The activity of the left and right anterior temporalis (AT) and superficial masseter muscles (MM) was recorded during maximum voluntary clenching and a chewing task (T0). In the UPCB-group, data were collected, also, after the correction of the UPCB with RME (T1) and 6 months later (T2), without any further treatment. Electromyographic indices comparing the activity of paired muscle were computed via software to estimate the extent of asymmetric AT and MM activity. Paired and unpaired t-test or Wilcoxon-signed rank and Mann-Whitney U test, ANOVA or Friedman test and chi-squared test were used in the statistical analysis. Results: Both groups presented with asymmetric activity of the muscles, which did not differ between groups (T0, all P > 0.05). The treatment determined a decrease in muscular activity (T1, P = 0.040), and a more asymmetric pattern of muscle activation during chewing (T1, P = 0.040), which returned similar to baseline values at T2 (all P > 0.05). Conclusions: UPCB does not contribute to an asymmetric activation of AT and MM during functional tasks. The treatment of UPCB by RME did not determine a more symmetric activity of the assessed muscles.


Asunto(s)
Maloclusión/terapia , Músculos Masticadores/fisiopatología , Técnica de Expansión Palatina , Estudios de Casos y Controles , Niño , Electromiografía/métodos , Femenino , Humanos , Masculino , Maloclusión/fisiopatología , Músculo Masetero/fisiopatología , Masticación/fisiología , Estadísticas no Paramétricas , Músculo Temporal/fisiopatología
13.
Clinics (Sao Paulo) ; 73: e453, 2018 11 29.
Artículo en Inglés | MEDLINE | ID: mdl-30517283

RESUMEN

OBJECTIVES: The present study aimed to assess the influence of dental occlusion on body posture and the competitive performance of young elite rowers. METHOD: Dental occlusion disturbance devices were used to simulate dental malocclusions. We assessed the influence of malocclusion on the body balance, paravertebral muscle contraction symmetry, and muscular power of young elite rowers. A nonparametric permutation test for repeated measures ANOVA, a Cochran's Q test for paired data and a paired Student's t-test were used in order to statistically evaluate the influence of artificial occlusal disturbance on each factor. A force platform and a Dyno Concept 2 machine were used as measuring instruments. RESULTS: A total of 7 members of the "Pôle France Aviron" (age range of 15-17 years) were enrolled in the study. None of the body balance parameters was significantly influenced by the artificial occlusal disturbance. The interposition of an occlusal silicone splint significantly increased the proportion of athletes presenting asymmetric muscular contractions from 14.3% to 85.7% (p=0.025) and induced a significant 17.7% decrease in the athletes' muscular power (p=0.030). CONCLUSIONS: This study shows the negative impacts of an occlusal disturbance on the athletic performance of young elite rowers. The detection of malocclusion traits by regular occlusal monitoring would be of great interest in this population.


Asunto(s)
Rendimiento Atlético/fisiología , Maloclusión/fisiopatología , Postura/fisiología , Deportes Acuáticos/fisiología , Adolescente , Análisis de Varianza , Estudios Cruzados , Oclusión Dental , Prueba de Esfuerzo , Femenino , Humanos , Masculino , Contracción Muscular/fisiología , Ferulas Oclusales , Proyectos Piloto , Equilibrio Postural/fisiología , Valores de Referencia , Estadísticas no Paramétricas
14.
Prog Orthod ; 19(1): 45, 2018 Nov 12.
Artículo en Inglés | MEDLINE | ID: mdl-30417234

RESUMEN

BACKGROUND: Deglutitive motion of the tongue may function to maintain tooth position. However, the causation between abnormal patterns of orofacial muscle function and dental malocclusion remains unclear. To clarify the pathogenic mechanism of malocclusion, it is important to determine the relative positional relationship between the tongue tip and incisor edge or the dorsal tongue and palate during deglutition. Here, we assessed the utility of 3-T segmented cine-magnetic resonance (MR) imaging, combined with static MR images for hard tissue visualization, in assessing the relationship between the tongue and the surrounding tissues during deglutitive tongue movement. METHODS: Cine-MR images were acquired from three healthy female volunteers during deglutition who had no history of swallowing disorder or other chronic illness, normal alignment and occlusion, and a skeletal class I relationship. Three cine-MR images were taken during deglutition in accordance with an auditory cue for each volunteer. During static imaging, custom-made, contrast-medium-filled clear retainers were positioned in the mouth to allow visualization of the upper and lower incisors and hard palate boundaries. Static images were superimposed onto images of the three stages in deglutitive tongue movement, which were selected from a series of cine-MR images. These superimpositions were assessed five times by tracing cephalometric parameters to examine the reproducibility of the method. RESULTS: Traces varied little across repeated measurements, and all subjects had a similar pattern of dorsal tongue movement. Tongue-to-palate contact increased slightly during the first to second stage of swallowing and abruptly increased during the second to third stage, while the tongue tip position remained constant. CONCLUSIONS: Segmented cine-MR imaging combined with static MR images is useful for assessing soft tissue motion during deglutition. This method is particularly useful in dentistry to evaluate the relationship between tongue function and maxillofacial morphology in terms of orthodontic treatment and orofacial myofunctional therapy, and for improving tongue movement during speech therapy.


Asunto(s)
Deglución , Imagen por Resonancia Cinemagnética , Movimiento , Lengua/diagnóstico por imagen , Lengua/fisiología , Adulto , Cefalometría , Femenino , Humanos , Maloclusión/fisiopatología , Valores de Referencia
15.
J Int Med Res ; 46(12): 4952-4964, 2018 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-30387387

RESUMEN

OBJECTIVE: The association between occlusal contact and orofacial pain remains unclear. The aim of this study was to detect occlusal contact tightness by using a new method and to compare differences between patients and asymptomatic controls. METHODS: Fifteen female patients with orofacial myalgia and fifteen age- and sex-matched asymptomatic controls were enrolled. Occlusal contacts were recorded by making bite imprints. The numbers, sizes, and distributions of the contacts were detected by making photos of bite imprints after biting. The Mann-Whitney U test and ANOVA were used for statistical analysis. RESULTS: In myalgia patients, impact contacts at the molar regions were more frequent, larger in number and area size, and were distributed more on guiding cusps, compared with impact contacts in asymptomatic controls. CONCLUSION: Our new method revealed more prevalent and more severe impact contacts in orofacial myalgia patients, compared with asymptomatic controls.


Asunto(s)
Maloclusión/fisiopatología , Enfermedades de la Boca/fisiopatología , Mialgia/fisiopatología , Adolescente , Adulto , Estudios de Casos y Controles , Femenino , Estudios de Seguimiento , Humanos , Masculino , Proyectos Piloto , Pronóstico , Adulto Joven
16.
Braz Oral Res ; 32: e95, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-30231170

RESUMEN

The aim of the present study was to evaluate the prevalence and impact of malocclusion on oral health-related quality of life (OHRQoL) among schoolchildren aged 8 to 10 years and their parents in Diamantina, a town in the southeast of Brazil. A cross-sectional study was conducted with a sample of 390 randomly selected children who were subjected to a clinical oral examination. The Dental Aesthetic Index was used to diagnose malocclusion and the need for orthodontic treatment. The Child Perceptions Questionnaire (CPQ (8-10)) was used to evaluate the impact of malocclusion on OHRQoL. The children's parents answered the Brazilian Economic Criterion Questionnaire for the socioeconomic classification. Data analysis involved the nonparametric Kruskal-Wallis test and Spearman's correlation coefficients. The variables were grouped into a hierarchy of categories ranging from distal to proximal determinants. Poisson regression analysis with robust variance was performed at each level to correlate the total CPQ (8-10) score with the independent variables. The prevalence of malocclusion was 78.7%. Crossbite remained significantly associated with a negative impact on OHRQoL (PR = 1.28; 95%CI:1.17-1.39; p < 0.001). The prevalence of malocclusion was high in the sample investigated and exerted a negative impact on OHRQoL.


Asunto(s)
Maloclusión/epidemiología , Maloclusión/fisiopatología , Salud Bucal/estadística & datos numéricos , Calidad de Vida , Brasil/epidemiología , Niño , Estudios Transversales , Caries Dental/epidemiología , Caries Dental/fisiopatología , Estética Dental , Femenino , Humanos , Indice de Necesidad de Tratamiento Ortodóncico , Masculino , Prevalencia , Índice de Severidad de la Enfermedad , Factores Socioeconómicos , Estadísticas no Paramétricas , Encuestas y Cuestionarios
17.
J Plast Reconstr Aesthet Surg ; 71(12): 1786-1795, 2018 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-30172730

RESUMEN

BACKGROUND: Maxillary retrognathia is a well-known consequence of abnormal facial growth in patients with cleft lip and palate. Orthognathic surgery improves facial appearance and occlusion but may induce velopharyngeal insufficiency. The aim of this study was to evaluate the effect of orthognathic surgery on velopharyngeal function by using speech analysis and lateral cephalometric radiographs. PATIENTS AND METHODS: We conducted a retrospective study of 47 patients who underwent maxillary advancement ±â€¯mandibular setback between 2006 and 2016. Preoperative and 1 year postoperative audio recordings were blinded for scoring by three trained speech therapists. Preoperative and 1 year postoperative lateral cephalometric radiographs were used to obtain information about skeletal movement and its relationship with the velopharyngeal area. Correlations between speech outcomes and cephalometric radiographs were determined. RESULTS: Hyponasality improved significantly after surgery (p < 0.05), whereas hypernasality deteriorated significantly only in patients who underwent maxillary advancement alone (p < 0.05). No difference in speech parameters was found between patients with hypernasality or patients who had a pharyngoplasty preoperatively and the rest of the group. No correlation was found between the amount of maxillary advancement and hypernasality. A significant correlation (r < -0.49, p < 0.05) was found between the preoperative velar length and hypernasality postoperatively. CONCLUSIONS: Maxillary advancement has a negative impact on velopharyngeal function, whereas bimaxillary surgery seems to protect from deterioration. No difference was found in the amount of maxillary advancement or in velopharyngeal measurements between the Le Fort I group and the bimaxillary group. A short soft palate is a predictor of hypernasality after orthognathic surgery.


Asunto(s)
Procedimientos Quirúrgicos Ortognáticos/métodos , Habla/fisiología , Insuficiencia Velofaríngea/fisiopatología , Puntos Anatómicos de Referencia , Cefalometría/métodos , Labio Leporino/fisiopatología , Fisura del Paladar/fisiopatología , Femenino , Humanos , Masculino , Maloclusión/diagnóstico por imagen , Maloclusión/fisiopatología , Mandíbula/diagnóstico por imagen , Mandíbula/cirugía , Avance Mandibular/métodos , Maxilar/diagnóstico por imagen , Maxilar/cirugía , Osteotomía Le Fort/métodos , Fonética , Radiografía , Retrognatismo/diagnóstico por imagen , Retrognatismo/fisiopatología , Retrognatismo/cirugía , Estudios Retrospectivos , Trastornos del Habla/fisiopatología , Trastornos del Habla/cirugía , Adulto Joven
18.
Am J Orthod Dentofacial Orthop ; 154(3): 405-411, 2018 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-30173844

RESUMEN

INTRODUCTION: Cerebral palsy (CP) is an encephalic static lesion characterized as a nonprogressive disorder of movements and posture with functional deficits that may favor the occurrence of various malocclusions. We looked for a possible association between overall functional impairment and malocclusion in this population. METHODS: Seventy patients from the Center of Attendance for Special Needs Patients, ages 6 to 18 years and with a CP diagnosis, were involved in the research. The overall degree of functional impairment was assessed with the Gross Motor Function Classification System, and malocclusion was evaluated with the criteria established by the World Health Organization and selected occlusion characteristics. To test the associations, univariate and multiple logistic Poisson regression analyses were used, and prevalence ratio values were calculated. RESULTS: Patients with limited or severely limited mobility (Gross Motor Function Classification of 4 or 5) (P = 0.003), parafunctional habits (P = 0.001), and a caregiver who was not the mother had 3 to 4 times more risk for open bite. Patients with dyskinetic CP are 4 times more likely to develop deepbite (P = 0.005). CONCLUSIONS: The results showed that the type of CP, the degree of motor involvement, and the presence of parafunctions are important factors to be considered to establish a correct diagnosis of malocclusion in persons with CP.


Asunto(s)
Parálisis Cerebral/complicaciones , Parálisis Cerebral/fisiopatología , Maloclusión/etiología , Maloclusión/fisiopatología , Adolescente , Brasil , Niño , Estudios Transversales , Femenino , Humanos , Masculino , Factores de Riesgo , Encuestas y Cuestionarios
19.
J Oral Rehabil ; 45(10): 747-755, 2018 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-29972708

RESUMEN

BACKGROUND: Temporomandibular Disorders (TMD) is a multifactorial condition, which could be associated to occlusal and psychological factors, such as anxiety. OBJECTIVE: Investigate if anxiety and malocclusion are associated with the prevalence of TMD in adolescents. METHODS: To ensure a population-based representative sample, 934 adolescents aged 10 to 14 years old from Curitiba-PR, Brazil were randomly selected and examined according to Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) and malocclusion by a single-calibrated examiner (Kappa > 0.80). Anxiety was assessed according to trait anxiety (STAI-T), categorised as high, moderate and low levels. For occlusal exam, it was considered: Angel's molar relationship, anterior and posterior crossbite, excessive overjet, open and deep bite. The associations were analysed by the crude and adjusted prevalence ration (RPa ) of TMJ, calculated by a Poisson multivariate regression with robust variance (α = 0.05). RESULTS: The prevalence of at least one type of malocclusion was found in 52.3%. Anxiety was found in high level (12.2%), moderate (70.4%) and low (17.5%). Presence of high anxiety was significantly associated with the prevalence of TMD symptoms (RPa  = 4.06, P < 0.001), as well as the prevalence of myofascial pain (RPa  = 24.78; P < 0.001) and prevalence of disc displacement with reduction (RPa  = 11.08, P < 0.001). Adolescents Class II had higher prevalence of myofascial pain (Class II RPa  = 1.73; P < 0.015) than adolescents Class I. Adolescents Class III presented higher prevalence of myofascial pain (PRa 2.53; P = 0.004) than adolescents Class I. CONCLUSION: Anxiety is strongly associated with TMD in adolescents. Presence of Class II or III is associated with higher prevalence of myofascial pain in adolescentsPLESAE check and approve the edit made in the article title.


Asunto(s)
Salud del Adolescente , Ansiedad/fisiopatología , Dolor Facial/fisiopatología , Maloclusión/fisiopatología , Trastornos de la Articulación Temporomandibular/fisiopatología , Adolescente , Ansiedad/etiología , Ansiedad/psicología , Brasil , Niño , Estudios Transversales , Dolor Facial/etiología , Dolor Facial/psicología , Femenino , Humanos , Comunicación Interdisciplinaria , Masculino , Maloclusión/etiología , Maloclusión/psicología , Dimensión del Dolor , Prevalencia , Factores de Riesgo , Trastornos de la Articulación Temporomandibular/complicaciones , Trastornos de la Articulación Temporomandibular/psicología
20.
J Oral Rehabil ; 45(9): 684-691, 2018 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-29908035

RESUMEN

During childhood, perioral muscle function is closely associated with malocclusion. To clarify the effects of tongue function on maxillofacial morphology in children, tongue pressure and maximum lip-closing force (LCF) were measured and the relationship between perioral muscle function and maxillofacial morphology was evaluated according to the skeletal classification. Maximum tongue pressure (MTP) and swallowing tongue pressure (STP) were measured on the anterior palatine rugae in 100 children (Hellman's dental stages IIIA-IIIC) using a balloon-type tongue pressure measurement device. Lip-closing force was measured using an LCF measurement device. Lateral cephalograms were examined to classify subjects into skeletal (S)-I, S-II and S-III groups. Correlations of skeletal classification with tongue pressure and LCF were examined. Correlations of lateral cephalometric measurements with palatal volume (PV), measured using a three-dimensional optical scanner, were evaluated. Maximum tongue pressure was significantly lower in the S-II group than in other groups. Swallowing tongue pressure was significantly lower in the S-II group than in the S-III group. Lip-closing force was significantly higher in the S-III group than in other groups. Swallowing tongue pressure was positively correlated with MTP and PV. Correlations between tongue pressure and anteroposterior skeletal classification indicated the importance of quantitative tongue function assessment.


Asunto(s)
Cefalometría , Deglución/fisiología , Maloclusión/fisiopatología , Músculos Masticadores/fisiología , Contracción Muscular/fisiología , Paladar (Hueso)/fisiología , Lengua/fisiología , Grupo de Ascendencia Continental Asiática , Niño , Femenino , Humanos , Labio/fisiología , Masculino , Músculos Masticadores/diagnóstico por imagen , Presión , Lengua/diagnóstico por imagen
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