Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 539
Filtrar
1.
Int. j. morphol ; 38(4): 1053-1059, Aug. 2020. tab, graf
Artículo en Inglés | LILACS | ID: biblio-1124896

RESUMEN

The aim of this study was to evaluate the hard and soft tissue profile changes following treatment of functional and mild skeletal class III malocclusion in mixed dentition by means of the Frankel functional regulator (FR-3) appliance, and to reveal the mechanism and effectiveness of treatment with FR-3 appliance. Twenty-six patients (chronological mean age, 8.7±1.4 years; mean treatment duration, 10.3±1.3 months) with functional and mild skeletal class III malocclusion were selected and treated with FR-3 appliances. Lateral cephalogram was taken pre- and post-treatment, and the data was analyzed by paired-samples t test with SPSS22.0 software package. Differences were considered statistically significant at P < 0.05. The results demonstrated that the FR-3 appliance produced a statistically significant decrease in L1-NB, L1-MP, U1-L1 (P<0.01) and an increase greatly in ANB, MP-FH, Y axis, ANSMe, ANS-Me/N-Me and overjet (P<0.01). SNA, SNB were increased significantly (P<0.05). Meanwhile, N'-Sn-Pog', ULSn-SN, LLSiSN increased, S-N'-Si, LL-EP decreased with significant difference (P<0.01). S-N'-Sn, Cm-Sn-UL, UL-EP, Sn-Mes and Ns-Mes increased with significant difference (P<0.05). Therefore it was concluded that after FR-3 treatment, the position of mandible may rotate clockwise backwards and downwards, with the labioversion of upper incisors and linguoversion of lower incisors. Although point A moved mesially, the length and position of the maxilla did not change significantly. With the protrusion of upper lip and the retrusion of lower lip, the relationship among nose, upper lip, lower lip and chin become harmonious, the profile of soft tissue is more coordinated and attractive.


El objetivo de este estudio fue evaluar los cambios en el perfil de los tejidos duros y blandos después del tratamiento de la maloclusión funcional y leve de la clase III esquelética en la dentición mixta mediante el aparato regulador funcional Frankel (FR-3), y revelar el mecanismo y efectividad del tratamiento con el aparato FR-3. Veintiseis pacientes (edad media 8,7 ± 1,4 años; duración media del tratamiento, 10,3 ± 1,3 meses) con maloclusión funcional y leve de clase esquelética III fueron seleccionados y tratados con aparatos FR-3. El cefalograma lateral se tomó antes y después del tratamiento, y los datos se analizaron mediante la prueba t de muestras con el software SPSS22.0. Las diferencias se consideraron estadísticamente significativas a P <0,05. Los resultados demostraron que el dispositivo FR-3 produjo una disminución estadísticamente significativa en L1-NB, L1MP, U1-L1 (P <0,01) y un gran aumento en ANB, MP-FH, eje Y, ANS-Me, ANS -Me / N-Me y overjet (P <0,01). SNA, SNB se incrementaron significativamente (P <0,05). Mientras tanto, N'Sn-Pog', ULSn-SN, LLSi-SN aumentaron, S-N'-Si, LL-EP disminuyeron con una diferencia significativa (P <0,01). S-N'-Sn, Cm-Sn-UL, UL-EP, Sn-Mes y Ns-Mes aumentaron con una diferencia significativa (P <0,05). Por lo tanto, se concluyó que después del tratamiento con FR-3, la posición de la mandíbula puede girar en sentido reloj hacia atrás y hacia abajo, con labioversión de los incisivos superiores y linguoversión de los incisivos inferiores. Aunque el punto A se movió mesialmente, la longitud y la posición del maxilar no cambiaron significativamente. Con la protuberancia del labio superior y la retrusión del labio inferior, la relación entre la nariz, el labio superior, el labio inferior y el mentón se armoniza, el perfil del tejido blando es más coordinado y atractivo.


Asunto(s)
Humanos , Masculino , Femenino , Niño , Aparatos Ortodóncicos Funcionales , Dentición Mixta , Maloclusión de Angle Clase III/patología , Maloclusión de Angle Clase III/terapia , Cefalometría
2.
Tunis Med ; 98(3): 246-253, 2020 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-32395819

RESUMEN

INTRODUCTION: By means of orthopedics, orthognathic surgery or orthodontics, the management of the maxillary transverse defisciency is a key element of the orthodontic treatment plan, and the guarantee of its stability. the following work aims to support, through a clinical case, the management and the progression of the treatment of the maxillary transverse deficiency associated to a class III skeletal anomaly. OBSERVATION: The authors report the case of a 15-year-old patient with a severe class III    malocclusion, with severe maxillary transverse deficiency. The objectives of the treatment were, first, to solve the transverse disharmony by surgically assisted rapid maxillary expansion (SARME), then, secondly, to remove the dentoalveolar compensations and a bimaxillary orthognathic surgery, was carried out to correct the sagittal and vertical disharmony. CONCLUSION: Surgically assisted rapid maxillary expansion (SARME) appears to be advantageous, both functionally and aesthetically to overcome transverse maxillary deficiency. The agreement between the orthodontist, the maxillofacial surgeon and / or the plastic surgeon, both in the schedule and in the choice of surgical interventions, remains decisive concerning ortho-surgical treatments.


Asunto(s)
Maloclusión de Angle Clase III/cirugía , Maxilar/cirugía , Procedimientos Quirúrgicos Ortognáticos/métodos , Técnica de Expansión Palatina , Adolescente , Humanos , Maloclusión de Angle Clase III/patología , Maxilar/patología , Índice de Severidad de la Enfermedad
3.
Biomed Res Int ; 2020: 7238263, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32149128

RESUMEN

This study focus on the changes of the position and morphology of jaw and condyle after MEAW (the multiloop edgewise arch wire) treatment in adults with a nonlow angle (mean angle or high angle SN - MP > 27°) of skeletal class III (mild to moderate skeletal classs III means -5° < ANB < 0°) malocclusions measured by CBCT (cone beam computed tomography). Twenty adult patients (aged 17-26) with a nonlow angle of skeletal class III malocclusions were selected in this study taken orthodontic treatment by MEAW. CBCT was taken before and after the treatment to analyze the changes of the jaw and condyle. After treatment, the angle of L7-MP decreased 12.2°, L6-MP decreased 10.5°, L1-MP decreased 8.8° (P < 0.001 for each) and U1-SN increased (P < 0.05). There was no significant changes between anterior and posterior APDI index and between anterior and posterior spaces of the TMJ (temporomandibular joint) (P > 0.05). The linear ratio of the TMJ was the LR > 12 before treatment, while it was -12 < LR < 12 after treatment; however, there was no statistically significant difference between them (P > 0.05). There was also no significant change in anterior and posterior position and morphology of the condyle within the joint fossa after the treatment by MEAW in this study. MEAW technology in correcting the class III with nonlow angle patients mainly relies on the compensation of distally and posterior mandibular teeth, rather than the mandible and condyle moving backward to establish a neutral occlusal. This study was approved by the institutional ethics committee of the Second Hospital of Tianjin Medical University (No. KYJJ2013002).


Asunto(s)
Tomografía Computarizada de Haz Cónico/métodos , Oclusión Dental , Maloclusión de Angle Clase III/diagnóstico por imagen , Articulación Temporomandibular/diagnóstico por imagen , Adolescente , Adulto , Cefalometría/métodos , Femenino , Humanos , Maxilares/anatomía & histología , Maxilares/diagnóstico por imagen , Masculino , Maloclusión de Angle Clase III/patología , Maloclusión de Angle Clase III/terapia , Mandíbula/diagnóstico por imagen , Cóndilo Mandibular/anatomía & histología , Cóndilo Mandibular/diagnóstico por imagen , Soportes Ortodóncicos , Alambres para Ortodoncia , Articulación Temporomandibular/anatomía & histología , Adulto Joven
4.
Int J Pediatr Otorhinolaryngol ; 130: 109794, 2020 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-31812840

RESUMEN

OBJECTIVE: The aim of this investigation was to analyze the effects of RME and FM on the airway dimensions in Class III patients compared with untreated controls. METHODS: A sample of 47 Class III patients treated with RME and FM was analyzed. The treated group was compared with 18 untreated controls. Lateral cephalograms for each patient at T1, T2, and T3 were digitized. RESULTS: At long-term evaluation a significant increase in airway size and a significant decrease in adenoid size were found in the treated group as well as an improvement in the pharynx dimension. During active treatment the treated group showed a significant improvement in lower airway size and in lower pharynx dimension. A significant decrease in adenoid size was also found. CONCLUSION: The treatment with RME and FM produced favorable stable changes in the airway dimensions in Class III subjects when compared with untreated controls.


Asunto(s)
Aparatos de Tracción Extraoral , Maloclusión de Angle Clase III/patología , Maloclusión de Angle Clase III/terapia , Máscaras , Técnica de Expansión Palatina , Faringe/patología , Factores de Edad , Cefalometría , Niño , Preescolar , Femenino , Humanos , Masculino , Estudios Retrospectivos
5.
Am J Orthod Dentofacial Orthop ; 156(2): 248-256.e2, 2019 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-31375235

RESUMEN

INTRODUCTION: The treatment options for adults with increased overbite are limited to dentoalveolar changes that camouflage the condition. Because of high relapse tendency, defining the problem area is important when creating a treatment plan. This study aimed to evaluate dentoskeletal morphology in skeletal Class I and II anomalies associated with Angle Class I, Class II Division 1 (Class II/1), and Class II Division 2 (Class II/2) malocclusions with increased overbite compared with normal occlusion. METHODS: Pretreatment cephalograms of 306 patients (131 men, 175 women; overall ages 18-45 years) were evaluated. Four groups were constructed. Three groups had increased overbite (>4.5 mm): group 1 (n = 96) skeletal Class I (ANB = 0.5°-4°), group 2 (n = 85) skeletal Class II (ANB >4.5°) with Class II/1; and group 3 (n = 79) skeletal Class II with Class II/2 malocclusion. Group 4 as a control (n = 46) skeletal Class I normal overbite. Dental and skeletal characteristics of the groups were compared by sex. For statistical evaluations, analysis of variance followed by Tukey post hoc, Mann-Whitney U, and Kruskall-Wallis tests were used. Additionally correlation coefficients between overbite and skeletal/dental parameters were calculated. RESULTS: Between sexes, with regard to skeletal parameters, the men had greater values in millimetric measurements, and the women had higher SN/GoGn values. Maxillary/mandibular molar heights and the mandibular incisor heights were higher in men. In group 1, decreased lower anterior facial height (LAFH), retrusive mandibular incisors, and increased interincisal degree were determined. The maxillary molars were intrusive, whereas the vertical position of the mandibular molars and incisors in both jaws were normal. In group 2, retrognathic mandible, increased LAFH and mandibular plane angle, extrusive maxillary/mandibular incisors, protrusive mandibular incisors, and decreased interincisal degree were found. In group 3, decreased LAFH, increased interincisal degree, and retrusive incisors in both jaws were determined. There were significant negative correlations between SN/GoGN, palatal plane, and overbite in group 2 and between ANS-SN and overbite in group 3, and positive correlation between interinsical angle and overbite in all increased overbite groups. CONCLUSIONS: Dental morphology seems to be the main factor of increased overbite. Differences between groups were related primarily to inclinations and vertical positions of the incisors, rather than molar positions.


Asunto(s)
Maloclusión Clase II de Angle/patología , Maloclusión Clase I de Angle/patología , Sobremordida/epidemiología , Sobremordida/patología , Adolescente , Adulto , Análisis de Varianza , Puntos Anatómicos de Referencia , Cefalometría , Femenino , Humanos , Incisivo/patología , Masculino , Maloclusión de Angle Clase III/patología , Mandíbula/patología , Maxilar/patología , Persona de Mediana Edad , Diente Molar/patología , Retrognatismo/patología , Factores Sexuales , Turquia , Adulto Joven
6.
Am J Orthod Dentofacial Orthop ; 156(2): 266-274, 2019 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-31375237

RESUMEN

Adult orthodontic treatment involving maxillary transverse deficiency is a challenge for an interdisciplinary team. Surgically assisted rapid palatal expansion to segment the maxilla was once the treatment of choice, but the invasiveness, bone deficiency, and gingival recession hindered its acceptance. Corticotomy-assisted rapid maxillary arch expansion with ridge augmentation has the advantage of augmenting alveolar bony housing to accommodate and facilitate tooth movement. This approach was used to correct a severely constricted maxilla with bilateral posterior crossbite and anterior crowding in a 46-year-old man. Treatment time was 14 months. The accelerated arch expansion overcame the crossbite in 7 months, increasing intercanine distance by 5.2 mm and intermolar distance by 9.8 mm. Subsequent implant prosthesis was able to be restored in a functional normal occlusion. Satisfactory and stable clinical outcome was followed for 7 years. Corticotomy-assisted rapid maxillary arch expansion with alveolar bone augmentation is a novel and effective interdisciplinary approach for correcting adult maxillary transverse deficiency. Well controlled prospective clinical trails are warranted for further investigation.


Asunto(s)
Aumento de la Cresta Alveolar/métodos , Maloclusión/terapia , Técnica de Expansión Palatina , Técnicas de Movimiento Dental/métodos , Cefalometría , Modelos Dentales , Oclusión Dental , Estudios de Seguimiento , Humanos , Masculino , Maloclusión/diagnóstico por imagen , Maloclusión/patología , Maloclusión/cirugía , Maloclusión Clase II de Angle/diagnóstico por imagen , Maloclusión Clase II de Angle/patología , Maloclusión Clase II de Angle/cirugía , Maloclusión Clase II de Angle/terapia , Maloclusión de Angle Clase III/diagnóstico por imagen , Maloclusión de Angle Clase III/patología , Maloclusión de Angle Clase III/cirugía , Maloclusión de Angle Clase III/terapia , Maxilar/anomalías , Maxilar/patología , Maxilar/cirugía , Persona de Mediana Edad , Aparatos Ortodóncicos , Soportes Ortodóncicos , Alambres para Ortodoncia , Paladar (Hueso)/cirugía , Planificación de Atención al Paciente , Estudios Prospectivos , Resultado del Tratamiento
7.
Am J Orthod Dentofacial Orthop ; 156(1): 104-112.e3, 2019 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-31256822

RESUMEN

INTRODUCTION: Mandibular prognathism (MP) is subject to major polygenic influence and segregates within families in autosomal dominance with variable expressivity and incomplete penetrance. We aimed to identify the inheritance pattern and genes and loci involved in the development of MP in Mediterranean families and to evaluate the dentoskeletal characteristics of affected individuals. METHODS: Fifty-one eastern Mediterranean families with individuals affected by MP were identified. Data and biospecimens were collected from 14 of the families, including clinical examination, lateral cephalography (on subjects with Class III malocclusion), and 5 mL blood drawn from consenting affected and nonaffected relatives. Next-generation sequencing (NGS) was performed on 8 families (7 Lebanese, 1 Lebanese/Syrian), including large numbers of affected individuals over many generations and severe conditions, with the use of whole-exome sequencing. RESULTS: Most pedigrees suggested autosomal-dominant inheritance with an equal number of affected male and female individuals. Affected individuals had macrognathic and prognathic mandibles with dentoalveolar compensation. Genetic screening did not correspond with previously reported MP-linked genes, but yielded 3 novel genes (C1orf167, NBPF8, NBPF9) on chromosome 1 potentially responsible for mandibular development and macrognathism. CONCLUSIONS: In this first genetic study with the use of NGS on the largest reported number of families with MP, novel genes (C1orf167, NBPF8, NBPF9) were associated with familial MP in the eastern Mediterranean population.


Asunto(s)
Estudios de Asociación Genética , Predisposición Genética a la Enfermedad/genética , Maloclusión de Angle Clase III/genética , Prognatismo/genética , Adulto , Grupo de Ascendencia Continental Asiática , Cefalometría , Cromosomas Humanos Par 1/genética , Femenino , Genoma Humano , Humanos , Líbano , Masculino , Maloclusión de Angle Clase III/sangre , Maloclusión de Angle Clase III/diagnóstico por imagen , Maloclusión de Angle Clase III/patología , Persona de Mediana Edad , Linaje , Prognatismo/sangre , Prognatismo/diagnóstico por imagen , Prognatismo/patología , Análisis de Secuencia de ADN , Siria , Adulto Joven
8.
Int. j. morphol ; 37(2): 744-751, June 2019. tab, graf
Artículo en Inglés | LILACS | ID: biblio-1002288

RESUMEN

During development, bony changes in the palate are reflected in the palatal rugae. Therefore, we hypothesized that the palatal dimensions (PD) influence the shape and number of palatal rugae (PR). The objectives were to record the palatal rugae characteristics (PRC) and palatal dimensions (intercanine distance (ICD), intermolar distance (IMD), palatal height (PH) and palatal area (PA) in Classes I, II and III malocclusion patients and investigate their interrelationship, and statistically examine the possibility of predicting PRC with the PD. Four hundred eighty-one pre-orthodontic study casts of healthy patients with normal palate anatomy were grouped as Classes I, II and III and scanned using 3D cast scanner. The PRC, ICD, IMD, PH, and PA were recorded digitally using 3D enabled software. The data was statistically analyzed. A strong statistically significant difference was observed between PA and number of straight and wavy rugae. ICD and the number of straight rugae were also related. A weak correlation exists between malocclusion classes and PA. The remaining rugae characteristics did not exhibit any relation with palatal dimensions. PA is positively related to the number of straight rugae and negatively related to the number of wavy rugae. Bigger palates have more straight rugae and less number of wavy rugae. A weak correlation between PA and Angle's class I malocclusion exists. We also propose that PA has a developmental association with the number and shape of PR.


Durante el desarrollo, los cambios óseos en el paladar se reflejan en las rugas palatinas. Por lo tanto, planteamos la hipótesis de que las dimensiones palatinas influyen en la forma y el número de las rugas palatinas. Los objetivos fueron registrar las características de las rugas palatinas y las dimensiones palatales (distancia intercanina, distancia intermolar, altura palatina y área palatina) en pacientes con maloclusión de clases I, II y III e investigar su interrelación, y examinar estadísticamente la posibilidad de predecir las características de las rugas palatinas con las dimensiones palatinas. Cuatrocientos ochenta y un estudios pre-ortodónticos de pacientes sanos con anatomía normal del paladar se agruparon como Clases I, II y III y se escanearon con un escáner de emisión 3D. La distancia intercanina, distancia inter molar, altura palatina y área palatina se registraron digitalmente utilizando el software 3D. Los datos se analizaron estadísticamente. Se observó una diferencia estadísticamente significativa entre la altura palatina y el número de rugas rectas y onduladas. Se registró también la distancia intercanina y el número de rugas rectas. Existe una correlación débil entre las clases de maloclusión y la altura palatina. Las características restantes de las rugas palatinas no mostraron ninguna relación con las dimensiones palatinas. El área palatina está relacionada positivamente con el número de rugas rectas y negativamente relacionada con el número de rugas onduladas. Los paladares más grandes tienen más rugas rectas y menor cantidad de rugas onduladas. Existe una correlación débil entre el área palatina y la clase I de maloclusión de Angle. También proponemos que el área palatina tiene una asociación de desarrollo con el número y la forma de rugas palatinas.


Asunto(s)
Humanos , Masculino , Femenino , Adulto , Adulto Joven , Paladar Duro/patología , Maloclusión/patología , Estudios Transversales , Estudio Observacional , Maloclusión Clase I de Angle/patología , Maloclusión Clase II de Angle/patología , Maloclusión de Angle Clase III/patología
9.
Medicine (Baltimore) ; 98(22): e15830, 2019 May.
Artículo en Inglés | MEDLINE | ID: mdl-31145325

RESUMEN

The purpose of this study was to evaluate the change in three-dimensional morphology and clinical symptoms of temporomandibular joint (TMJ) in class III dentofacial deformity patients postoperatively for 6 months after sagittal split ramus osteotomy (SSRO).Seventeen patients with skeletal Class III malocclusion and 10 asymptomatic volunteers (classified as Control group) were recruited for the study and underwent cone-beam computed tomography scanning. The geometries of the maxilla and mandible were reconstructed using MIMICS (Materialise, Leuven, Belgium). The morphologic measurements of the patients' TMJs were done before surgery and at 6-month follow-up - named as Pre and Post groups, respectively.The joint spaces (medial joint space, superior joint space, lateral joint space, anterior joint space, and posterior joint space) of the Control group were significantly greater than those of the Pre and Post groups (P < .05), and SSRO did not significantly change the TMJ morphology parameters. Five patients were found to have preoperative temporomandibular disorder (TMD) symptoms, and 3 of them were relieved at 6 months after surgery. Postoperative TMD symptom was observed in 1 patient without preoperative TMD symptom.SSRO did not markedly alter the TMJ morphology of the patients with mandibular prognathism. The effects of SSRO on TMD symptoms should be related to the type of deformity.


Asunto(s)
Maloclusión de Angle Clase III/cirugía , Osteotomía Sagital de Rama Mandibular/métodos , Adulto , Bélgica , Femenino , Humanos , Imagen por Resonancia Magnética , Masculino , Maloclusión de Angle Clase III/complicaciones , Maloclusión de Angle Clase III/patología , Articulación Temporomandibular/anatomía & histología , Trastornos de la Articulación Temporomandibular/complicaciones , Trastornos de la Articulación Temporomandibular/patología , Adulto Joven
10.
Sci Rep ; 9(1): 6189, 2019 04 17.
Artículo en Inglés | MEDLINE | ID: mdl-30996304

RESUMEN

The aim of the study was to investigate how to improve the forecasting of craniofacial unbalance risk during growth among patients affected by Class III malocclusion. To this purpose we used computational methodologies such as Transductive Learning (TL), Boosting (B), and Feature Engineering (FE) instead of the traditional statistical analysis based on Classification trees and logistic models. Such techniques have been applied to cephalometric data from 728 cross-sectional untreated Class III subjects (6-14 years of age) and from 91 untreated Class III subjects followed longitudinally during the growth process. A cephalometric analysis comprising 11 variables has also been performed. The subjects followed longitudinally were divided into two subgroups: favourable and unfavourable growth, in comparison with normal craniofacial growth. With respect to traditional statistical predictive analytics, TL increased the accuracy in identifying subjects at risk of unfavourable growth. TL algorithm was useful in diffusion of information from longitudinal to cross-sectional subjects. The accuracy in identifying high-risk subjects to growth worsening increased from 63% to 78%. Finally, a further increase in identification accuracy, up to 83%, was produced by FE. A ranking of important variables in identifying subjects at risk of growth worsening, therefore, has been obtained.


Asunto(s)
Estudios Transversales , Estudios Longitudinales , Maloclusión de Angle Clase III/patología , Adolescente , Algoritmos , Cefalometría/métodos , Niño , Anomalías Craneofaciales , Progresión de la Enfermedad , Femenino , Predicción/métodos , Humanos , Masculino , Desarrollo Maxilofacial
11.
Am J Orthod Dentofacial Orthop ; 155(4): 509-522, 2019 04.
Artículo en Inglés | MEDLINE | ID: mdl-30935606

RESUMEN

OBJECTIVE: Our aim was to describe hard- and soft-tissue asymmetry in people who have a skeletal Class III malocclusion, and to compare with those without asymmetry. We also performed a regional analysis of a possible correlation between facial soft- and hard-tissue asymmetries. METHODS: This retrospective study was performed with the use of the computed tomographic scans of 60 subjects. The skeletal Class III subjects were categorized into 2 subgroups: soft-tissue menton deviation ≤4 mm (n = 20) versus >4 mm (n = 20). The Class III groups were compared with a Class I symmetry group (n = 20). Hard and soft tissues were segmented into different morphologic areas and deviation calculated. Pearson correlation coefficients were obtained, and 1-way analysis of variance was conducted for statistical analysis. RESULTS: The highest deviation in the hard tissues of the Class III asymmetry group was in the corpus region (5.55 ± 3.05 mm), with the second highest in the angulus region (4.70 ± 2.43 mm). The highest average deviation in the soft tissues was seen in the lower cheek (7.04 ± 3.46 mm). In the different study groups, the amounts of asymmetry measured in anatomic structures on the mandible were found to be highly correlated between neighboring structures. CONCLUSIONS: Clinically and statistically significant differences were found in the anatomic regions located in the middle and lower thirds of the face. There was a medium or high correlation between condyle, coronoid process, ramus, and angulus regions. A low level of correlation was observed between middle face and mandibular asymmetries in hard-tissue upper cheek and lower cheek regions were correlated with different mandibular regions.


Asunto(s)
Asimetría Facial/patología , Maloclusión de Angle Clase III/patología , Adulto , Estudios de Casos y Controles , Mejilla/patología , Femenino , Humanos , Labio/patología , Masculino , Mandíbula/patología , Cóndilo Mandibular/patología , Maxilar/patología , Hueso Nasal/patología , Estudios Retrospectivos , Tomografía Computarizada por Rayos X , Adulto Joven
12.
J Craniomaxillofac Surg ; 47(3): 400-405, 2019 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-30691943

RESUMEN

PURPOSE: The purpose of this study was to examine changes in masseter and medial pterygoid muscles, ramus, condyle and occlusal force after bi-maxillary surgery in class II and III patients. SUBJECTS AND METHODS: The subjects were 42 patients (84 sides) who underwent sagittal split ramus osteotomy with Le Fort I osteotomy (21 class II cases: mandibular advancement and 21 class III cases: mandibular setback). The cross-sectional measurements of the masseter and medial pterygoid muscles, ramus and condyle were measured in horizontal plane images by computed tomography (CT), before and 1 year after the operation. Occlusal force and contact area were also recorded before and 1 year after the operation. RESULTS: Preoperatively, class II was significantly larger than class III in masseter width (P = 0.0068), masseter area (P < 0.0001) and medial pterygoid length (P < 0.0001). However, class II was significantly smaller than class III in medial pterygoid width (P < 0.0001). After 1 year, class II was significantly smaller than class III in masseter length (P = 0.0017). Class II was still larger than class III in medial pterygoid area after 1 year (P = 0.0343). Class II was significantly larger than class III in condylar angle pre-operatively (P < 0.0001) and after 1 year (P = 0.0006). After 1 year, class II decreased significantly more than class III in condylar thickness (P = 0.0020), condylar width (P < 0.0001) and condylar area (P < 0.0001). CONCLUSION: This study suggested that changes in the cross-sectional measurements of masseter and medial pterygoid muscles and the condyle differed between class II and class III patients, although occlusal force did not significantly change 1 year after surgery in both groups.


Asunto(s)
Fuerza de la Mordida , Mandíbula/anatomía & histología , Músculo Masetero/anatomía & histología , Maxilar/cirugía , Músculos Pterigoideos/anatomía & histología , Cefalometría , Femenino , Humanos , Imagenología Tridimensional , Maloclusión Clase II de Angle/patología , Maloclusión Clase II de Angle/fisiopatología , Maloclusión Clase II de Angle/cirugía , Maloclusión de Angle Clase III/patología , Maloclusión de Angle Clase III/fisiopatología , Maloclusión de Angle Clase III/cirugía , Avance Mandibular , Músculo Masetero/fisiología , Osteotomía Le Fort , Osteotomía Sagital de Rama Mandibular , Músculos Pterigoideos/fisiología , Estudios Retrospectivos , Tomografía Computarizada por Rayos X
13.
Cranio ; 37(4): 214-222, 2019 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-29327661

RESUMEN

OBJECTIVE: To assess changes in the tongue and hyoid bone positions and airway dimensions after maxillary protraction using lateral cephalograms. METHODS: Lateral cephalograms were obtained before (C0) and after (C1) an observation period for untreated children with skeletal Class I malocclusion and before (T0), immediately after (T1), and one year after (T2) maxillary protraction in children with skeletal Class III malocclusion. Cephalometric measurements were compared between the time points in both patient groups. RESULTS: Immediately after maxillary protraction, the tongue moved superiorly and the nasopharyngeal and superior oropharyngeal airway dimensions increased. No significant changes in the middle or inferior oropharyngeal airway dimensions or in the hyoid bone position were noted after treatment. CONCLUSIONS: Maxillary protraction improved tongue posture and modified the nasopharyngeal and superior oropharyngeal airway dimensions in patients with skeletal Class III malocclusion. Consequently, maxillary protraction may restore the intra- and extraoral balance and improve respiratory function.


Asunto(s)
Cefalometría/métodos , Hueso Hioides/patología , Maloclusión de Angle Clase III/patología , Maloclusión de Angle Clase III/rehabilitación , Maloclusión Clase I de Angle/patología , Maloclusión Clase I de Angle/rehabilitación , Maxilar , Faringe/patología , Lengua/patología , Tracción/métodos , Niño , Aparatos de Tracción Extraoral , Femenino , Humanos , Masculino , Maloclusión Clase I de Angle/diagnóstico , Maloclusión de Angle Clase III/diagnóstico , Factores de Tiempo , Tracción/instrumentación
14.
Orthod Craniofac Res ; 22(1): 9-15, 2019 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-30421852

RESUMEN

OBJECTIVES: To clarify the associations among tongue volume, hyoid position, airway volume and maxillofacial form using cone beam computed tomography (CBCT) data for children with Class-I, Class-II and Class-III malocclusion. SETTING AND SAMPLE POPULATION: Sixty children (mean age, 9.2 years) divided into Class-I, Class-II and Class-III malocclusion groups according to the A-nasion-B angle. MATERIAL AND METHODS: Cone beam computed tomography was used for three-dimensional reconstruction of the maxillofacial region and airway. The hyoid position and the tongue, airway and oral cavity volumes were evaluated. Upper airway ventilation status was calculated using computational fluid dynamics. The groups were compared using analysis of variance and Kruskal-Wallis tests; relationships among the parameters were assessed using Pearson's and Spearman's rank correlation tests. RESULTS: The tongue volume was larger in Class-III patients (50.63 cm3 ) than in Class-I patients (44.24 cm3 ; P < 0.05). The hyoid position was lower (49.44 cm), and anatomical balance (AB; tongue volume/oral cavity volume; 85.06%) was greater in Class-II patients than in Class-I patients (46.06 cm, 80.57%, respectively; P < 0.05 for both). The hyoid height showed a positive correlation with AB (r = 0.614; P < 0.001). CONCLUSIONS: Children with Class-III malocclusion have large tongue volumes and small AB; the reverse is true for children with Class-II malocclusion. The hyoid position is closely associated with AB in children with malocclusion.


Asunto(s)
Hueso Hioides/patología , Maloclusión de Angle Clase III/patología , Maloclusión Clase II de Angle/patología , Maloclusión Clase I de Angle/patología , Nasofaringe/patología , Lengua/patología , Niño , Tomografía Computarizada de Haz Cónico , Cara/diagnóstico por imagen , Cara/patología , Femenino , Humanos , Hueso Hioides/diagnóstico por imagen , Imagenología Tridimensional , Masculino , Maloclusión Clase I de Angle/diagnóstico por imagen , Maloclusión Clase II de Angle/diagnóstico por imagen , Maloclusión de Angle Clase III/diagnóstico por imagen , Maxilar/diagnóstico por imagen , Maxilar/patología , Nasofaringe/diagnóstico por imagen , Estudios Retrospectivos , Lengua/diagnóstico por imagen
15.
J Craniomaxillofac Surg ; 46(12): 2103-2107, 2018 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-30420148

RESUMEN

PURPOSE: The purpose of this study was to examine the relationship between occlusal force and condylar morphology in class II and III after sagittal split ramus osteotomy (SSRO) with Le Fort I osteotomy. MATERIALS AND METHODS: The subjects were 42 female patients who underwent bi-maxillary surgery, and were divided into 2 groups (21 class II and 21 class III cases). They were selected randomly from among patients that underwent surgery from 2012 to 2017. Condylar height, ramus height, ramus inclination and condylar square were assessed by computed tomography (CT), preoperatively and 1 year postoperatively. Occlusal contact area and occlusal force were measured pre- and 1, 3, 6 and 12 months post-operative. RESULTS: Condylar height and ramus height of the class II advancement cases decrease more significantly than those of class III. There were no significant differences in time-course changes of occlusal force and area between the class II and III. In the class II cases, occlusal force at 1 and 3 months was significantly lower than the preoperative value (P = 0.0009, P = 0.0002). On the other hand, in class III, occlusal force at 1, 3 and 6 months (P = 0.0038, P = 0.0031, P = 0.0283) was significantly lower than the preoperative value. CONCLUSION: This study suggested that occlusal force of the class II advancement cases reached the pre-operative level earlier than that of the class III setback cases, even though condylar height decreased after surgery in the class II cases. However, a correlation between occlusal force change and condylar height reduction after surgery could not be found.


Asunto(s)
Fuerza de la Mordida , Maloclusión de Angle Clase III/cirugía , Maloclusión Clase II de Angle/cirugía , Cóndilo Mandibular/patología , Osteotomía Maxilar , Osteotomía Sagital de Rama Mandibular , Articulación Temporomandibular/patología , Adolescente , Adulto , Cefalometría , Femenino , Humanos , Imagen por Resonancia Magnética , Maloclusión Clase II de Angle/diagnóstico por imagen , Maloclusión de Angle Clase III/diagnóstico por imagen , Maloclusión de Angle Clase III/patología , Cóndilo Mandibular/diagnóstico por imagen , Persona de Mediana Edad , Osteotomía Le Fort , Estudios Retrospectivos , Articulación Temporomandibular/diagnóstico por imagen , Tomografía Computarizada por Rayos X , Resultado del Tratamiento
16.
Prog Orthod ; 19(1): 28, 2018 Aug 02.
Artículo en Inglés | MEDLINE | ID: mdl-30069814

RESUMEN

BACKGROUND: One of the most controversial issues in treatment planning of class III malocclusion patients is the choice between orthodontic camouflage and orthognathic surgery. Our aim was to delineate diagnostic measures in borderline class III cases for choosing proper treatment. METHODS: The pretreatment lateral cephalograms of 65 patients exhibiting moderate skeletal class III were analyzed. The camouflage group comprised of 36 patients with the mean age of 23.5 (SD 4.8), and the surgery group comprised of 29 patients with the mean age of 24.8 years (SD 3.1). The camouflage treatment consisted of flaring of the upper incisors and retraction of the lower incisors, and the surgical group was corrected by setback of the mandible, maxillary advancement, or bimaxillary surgery. Mann-Whitney U test was used to compare the variables between the two groups. Stepwise discriminant analysis was applied to identify the dentoskeletal variables that best separate the groups. RESULTS: Holdaway H angle and Wits appraisal were able to differentiate between the patients suitable for orthodontic camouflage or surgical treatment. Cases with a Holdaway angle greater than 10.3° and Wits appraisal greater than - 5.8 mm would be treated successfully by camouflage, while those with a Holdaway angle of less than 10.3° and with Wits appraisal less than - 5.8 mm can be treated surgically. Based on this model, 81.5% of our patients were properly classified. CONCLUSIONS: Holdaway H angle and Wits appraisal can be used as a critical diagnostic parameter for determining the treatment modality in class III borderline cases.


Asunto(s)
Maloclusión de Angle Clase III/terapia , Cefalometría , Femenino , Humanos , Masculino , Maloclusión de Angle Clase III/diagnóstico , Maloclusión de Angle Clase III/patología , Maloclusión de Angle Clase III/cirugía , Ortodoncia Correctiva , Procedimientos Quirúrgicos Ortognáticos , Estudios Retrospectivos , Adulto Joven
17.
J Contemp Dent Pract ; 19(6): 712-718, 2018 Jun 01.
Artículo en Inglés | MEDLINE | ID: mdl-29959301

RESUMEN

AIM: The study was conducted to assess facial asymmetry in various dental malocclusions and to determine asymmetry in lower, mid, and upper face and jaws using posteroanterior cephalometric analysis. MATERIALS AND METHODS: Overall, 120 posteroanterior cepha-lograms were taken of individuals between 12 and 25 years of both sexes, and were divided into four groups: Angle's class I excellent occlusion, Angle's class I malocclusion, Angle's class II malocclusion, and Angle's class III malocclusion. These cepha-lograms were traced and Grummon's analysis was performed. RESULTS: In Angle's class I occlusion and Angle's class II malocclusion, the results obtained showed asymmetry present in the upper face. Correlation was found between occlusion, maloc-clusion, and facial asymmetry. CONCLUSION: Facial asymmetry was found in all dental occlusions whether excellent or malocclusion group, with maximum asymmetry having upward trend toward upper face starting from lower. CLINICAL SIGNIFICANCE: For the success of the orthodontic treatments in various types of malocclusion and to determine the facial asymmetry, posteroanterior view can be very helpful, as it gives additional information which can be utilized to augment treatment planning and improve prognosis in terms of relapse prevention.


Asunto(s)
Asimetría Facial/diagnóstico , Maloclusión/patología , Adolescente , Adulto , Cefalometría , Niño , Cara/patología , Asimetría Facial/patología , Femenino , Humanos , Maxilares/patología , Masculino , Maloclusión Clase I de Angle/patología , Maloclusión Clase II de Angle/patología , Maloclusión de Angle Clase III/patología , Adulto Joven
18.
J Craniomaxillofac Surg ; 46(8): 1336-1342, 2018 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-29859817

RESUMEN

PURPOSE: Maxillary downgraft (MD) and mandibular setback (MS) are problematic procedures in terms of postoperative stability. While the amount of intraoperative clockwise rotation (CWR) of the proximal segment (PS) after MS combined with MD has a positive correlation with the amount of MD, mandibular relapse after MS with MD in relation to intraoperative CWR of the PS has not been reported. Moreover, the effect of mandibular relapse on maxillary stability after MS with MD remains unclear. The purpose of this study is to evaluate mandibular and maxillary stability after MS with MD in relation to intraoperative CWR of the PS and amount of MD. MATERIALS AND METHODS: The study included 57 patients who underwent bimaxillary orthognathic surgery. Patients were classified into two groups according to whether MD was performed or not performed: Group I had 2 mm or more MD; and Group II had less than 2 mm MD including vertical impaction or no vertical changes. The amount of surgical movement and postoperative relapse were cephalometrically evaluated and statistically analyzed. RESULTS: There was no significant difference in MS between Groups I and II, however, the vertical movement of the maxilla was different significantly (p < 0.001). In Group I, the intraoperative CWR and postoperative CCWR of the PS was greater than that of Group II (p = 0.010; p < 0.001, respectively). Consequently, the anterior relapse of the mandible was greater in Group I than in Group II despite the same amount of MS in Groups I and II. In Group I, with direct bone contact using Le Fort I inclined osteotomy, vertical relapse at point A showed no statistical correlation with anterior relapse at point B, while the vertical and horizontal dental relapse at U1 showed significant correlations with anterior relapse at point B (r = -0.403, p = 0.030; r = 0.581, p < 0.001, respectively). CONCLUSION: For more stable results, Le Fort I inclined osteotomy is recommended to obtain direct bone contact when moving the maxilla inferiorly. The PS must also be fixed while maintaining vertical bone step to prevent CWR.


Asunto(s)
Mandíbula/cirugía , Maxilar/cirugía , Procedimientos Quirúrgicos Ortognáticos/efectos adversos , Femenino , Humanos , Masculino , Maloclusión de Angle Clase III/patología , Maloclusión de Angle Clase III/cirugía , Mandíbula/patología , Maxilar/patología , Procedimientos Quirúrgicos Ortognáticos/métodos , Osteotomía Le Fort/efectos adversos , Complicaciones Posoperatorias/etiología , Recurrencia , Adulto Joven
19.
Int. j. morphol ; 36(2): 430-434, jun. 2018. tab, graf
Artículo en Inglés | LILACS | ID: biblio-954132

RESUMEN

The objective of the study was to investigate the morphological changes of skeletal class III malocclusion in mixed dentition with light force protraction combined activities. Randomly selected 30 cases of orthodontics in Shanxi Medical University orthodontics patients (ages: 6-10 years) of the lateral cephalograms. Using the oral maxillary casting type of pre-traction device, according to the condition of maxillary dentition to select the corresponding activities of the movable expansion appliance, each side of the force of about 150-200 g, requiring patients to wear 10-12 hours a day, the appliance should be removed after reaching normal occlusion. The correlation cephalometric profile of the cranial lateral radiographs before and after orthodontic treatment was measured. All patients with skeletal class III malocclusion were improved, concave type became direct type, measurements SNA, ANB, A-Ptm, MP-SN, ANS-Me/N-Me increased, maxillary advancement and reconstruction are more obvious; mandible rotates clockwise; the increase of lip inclination of anterior teeth compensatory changes, lower anterior tooth inclination changes smaller; upper lip forward, nasolabial angle decreased, improved appearance significantly. Light force protraction combined activities can make the mixed dentition of skeletal class III malocclusion in patients with significant improvement in profile appearance.


El objetivo de este estudio fue investigar los cambios morfológicos de la maloclusión clase esquelética III, en la dentición mixta, con actividades combinadas de protracción de la fuerza ligera. Se seleccionaron aleatoriamente 30 casos de ortodoncia en pacientes de ortodoncia de la Universidad Médica de Shanxi (edades: 6-10 años) a partir de cefalogramas laterales, utilizando el tipo de dispositivo de pretracción de vaciado maxilar oral, de acuerdo con la condición de la dentición maxilar para seleccionar las actividades correspondientes del dispositivo de expansión móvil, cada lado con fuerza de alrededor de 150-200 g, requiriendo que los pacientes los utilizaran de 10 a 12 horas al día. El dispositivo debía ser retirado después de alcanzar la oclusión normal. Se midió el perfil cefalométrico de correlación de las radiografías laterales craneales, antes y después del tratamiento ortodóncico. Se observó mejoramiento en todos los pacientes con maloclusión de clase esquelética. Las mediciones SNA, ANB, APtm, MP-SN, ANS-Me / N-Me aumentaron, el avance y la reconstrucción maxilar fueron los cambios más significativos; la mandíbula giró en el sentido de las agujas del reloj, se observó un aumento de la inclinación labial de los dientes anteriores. Fue reducida la inclinación anterior del diente inferior, el ángulo nasolabial disminuyó y en general mejoró significativamente la apariencia. Las actividades combinadas de protrusión de la fuerza radiante pueden llevar a una mejora signficativa en el perfil de pacientes con dentición mixta de maloclusión clase III.


Asunto(s)
Humanos , Masculino , Femenino , Preescolar , Niño , Técnica de Expansión Palatina , Dentición Mixta , Maloclusión de Angle Clase III/patología , Maloclusión de Angle Clase III/terapia , Cefalometría , Aparatos de Tracción Extraoral
20.
BMC Oral Health ; 18(1): 45, 2018 03 16.
Artículo en Inglés | MEDLINE | ID: mdl-29548316

RESUMEN

BACKGROUND: The purpose of this study was to determine and compare the shapes, sizes, and bridging of the sella turcica in patients with different skeletal patterns and genders. METHODS: It was a cross-sectional comparative study. The samples were divided into three groups according to the skeletal pattern viz. Class I, Class II and Class III, and each group consisted of 40 samples (20 males and 20 females). The lateral cephalograms were traced and the sella turcica was assessed for its size, shape, and bridging. RESULTS: The mean length, anteroposterior diameter and depth of sella turcica were 8.13 ± 2.03 mm, 9.60 ± 1.43 mm and 6.40 ± 1.21 mm respectively. The mean length of sella turcica was 7.91 ± 1.52 mm in Class I, 7.32 ± 1.62 mm in Class II and 9.16 ± .2.42 in Class III skeletal pattern; anteroposterior diameter was 9.30 ± 1.02 mm in Class I, 9.15 ± 1.28 mm in Class II and 10.35 ± 1.64 mm in Class III skeletal pattern; and the depth was 6.40 ± 0.92 mm in Class I, 6.07 ± 1.01 mm in Class II and 6.74 ± .1.54 mm in Class III skeletal pattern. There were significant differences in length and anteroposterior diameter and sella turcica between Class I, Class II and Class III skeletal patterns (p = 0.01), (p = 0.01) respectively. There was no significant difference in size of sella turcica between different genders and age groups. Sixty percent of the patients studied had normal Sella morphology. Partial Sella turcica bridging and Sella turcica bridging was seen in this study in 23.33% and 11.67% of patients respectively. CONCLUSION: Sixty percent of the patients had normal sella turcica. There were significant differences in lengths and anteroposterior diameters among Class I, Class II and Class III patients. The larger size was present in skeletal Class III patients.


Asunto(s)
Maloclusión/patología , Silla Turca/patología , Adolescente , Adulto , Factores de Edad , Estudios Transversales , Femenino , Humanos , Masculino , Maloclusión Clase I de Angle/patología , Maloclusión Clase II de Angle/patología , Maloclusión de Angle Clase III/patología , Radiografía , Silla Turca/diagnóstico por imagen , Factores Sexuales , Adulto Joven
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA
...