Plication of the Suprahyoid Muscles Concomitant with Genioplasty to Improve the Aesthetics of the Submandibular Region / Plicatura de los Músculos Suprahioideos Concomitante con Genioplastia para Mejorar la Estética de la Región Submandibular

In addition to functionally correcting skeletal facial deformities, orthognathic surgery also has a great impact on aesthetics and facial proportions. However, patients who have soft tissue changes, such as tissue flaccidity, may not achieve an ideal result, and require complementary surgical techniques that promote aesthetic refinement. The literature on less invasive techniques is limited, and therefore, this work aims to report a surgical technique performed concomitantly with genioplasty to refine the harmony of the submandibular region, in a simple and effective way. Patient with skeletal class II deformity, with lack of mandibular definition and submandibular flaccidity, underwent bimaxillary advancement orthognathic surgery with advancement genioplasty to correct chin retrusion. Due to limited results with bone repositioning alone, plication of the suprahyoid musculature was performed in association with the same approach used in the genioplasty. As a result, there was traction in the cervical region, with a consequent decrease in the submental-cervical angle and improvement in submandibular aesthetics. Furthermore, there was no need for extensive surgical intervention and no impairment of the functional results of the orthognathic surgery itself. Therefore, it can be concluded that plication of the suprahyoid musculat ure concomitantly with genioplasty is a technique that promotes aesthetic gains in the cervical region.

Además de corregir funcionalmente las deformidades faciales esqueléticas, la cirugía ortognática también tiene un gran impacto en la estética y las proporciones faciales. Sin embargo, los pacientes que tienen cambios en los tejidos blandos, como la flacidez, pueden no lograr un resultado ideal y requieren técnicas quirúrgicas complementarias que promuevan el refinamiento estético. La literatura sobre técnicas menos invasivas es limitada, por lo que este trabajo tiene como objetivo reportar una técnica quirúrgica realizada concomitantemente con la genioplastia para refinar la armonía de la región submandibular, de manera simple y efectiva. Se trató a un paciente con deformidad esquelética clase II, con falta de definición mandibular y flacidez submandibular, intervenida de cirugía ortognática de avance bimaxilar con genioplastia de avance para corregir la retrusión del mentón. Debido a los resultados limitados solo con el reposicionamiento óseo, se realizó la plicatura de la musculatura suprahioidea en asociación con el mismo abordaje utilizado en la genioplastia. Como resultado, hubo tracción en la región cervical, con la consiguiente disminución del ángulo submentoniano-cervical y mejoría en la estética submandibular. Además, no hubo necesidad de una intervención quirúrgica extensa ni deterioro de los resultados funcionales de la cirugía ortognática en sí. Por lo tanto, se puede concluir que la plicatura de la musculatura suprahioidea concomitantemente con la genioplastia es una técnica que promueve ganancias estéticas en la región cervical.

Evaluación clínica para el aumento del mentón en pacientes sometidos a rinoplastia / Clinical evaluation for chin augmentation in patients undergoing rhinoplasty

Introducción: el análisis detallado de las proporciones nasofaciales desempeña un papel fundamental para lograr la armonía facial e identificar desequilibrios; asi se dirige el tratamiento quirúrgico para lograr mejores resultados postoperatorios. El objetivo de este estudio fue determinar la prevalencia de pacientes sometidos a rinoplastia que requerían, además, un aumento del mentón. Materiales y métodos: se seleccionaron 100 pacientes voluntarios sometidos a rinoplastia entre los 17 y 55 años y se les realizó un estudio fotográfico preoperatorio. Se realizó un análisis facial del tercio inferior de la cara mediante tres métodos: González-Ulloa, Goode y Silver, y se hizo un análisis univariado y bivariado. Resultados: 100 pacientes voluntarios ingresaron al estudio; de estos, 7 fueron excluidos y quedaron 73 mujeres y 20 hombres; la edad mínima fue de 17 años y la máxima de 55 años, con un promedio de 28,4 años. La edad media de los hombres fue de 30,9 años y de las mujeres de 28,2 años. Del total de pacientes, 96,7 % de los pacientes cumplían con 2 o 3 métodos para aumento del mentón; de estos, 78,8 % eran mujeres y 21,1 % eran hombres. Conclusión: un análisis adecuado de las proporciones nasofaciales es fundamental para determinar los procedimientos necesarios para lograr un buen resultado quirúrgico y una mayor satisfacción del paciente. Estos métodos no sustituyen el juicio estético del cirujano; sin embargo, proporcionan un estándar objetivo para el diagnóstico de los desequilibrios faciales.

Introduction: Detailed analysis of nasofacial proportions plays a fundamental role in achieving facial harmony and identifying imbalances; thus, surgical treatment is directed to achieve better postoperative outcomes. The aim of this study was to determine the prevalence of patients undergoing rhinoplasty who also required chin augmentation. Materials and methods: 100 volunteer rhinoplasty patients between 17 and 55 years of age were selected and a preoperative photographic study was performed. Facial analysis of the lower third of the face was performed by three methods: Gonzalez-Ulloa, Goode and Silver, univariate and bivariate analysis was performed. Results: 100 voluntary patients entered the study, 7 of these were excluded, leaving 73 women and 20 men, the minimum age was 17 years and the maximum 55 years, with an average of 28.4 years. The mean age of the men was 30.9 years and of the women 28.2 years. Of the total number of patients, 96.7% of the patients com- plied with 2 or 3 methods for chin augmentation, of these 78.8% were women and 21.1% men. Conclusions: Adequate analysis of nasofacial proportions is essential to determine the procedures necessary to achieve a good surgical outcome and greater patient satisfaction. These methods do not replace the surgeon's aesthetic judgment; however, they provide an objective standard for the diagnosis of facial imbalances.

Mentoplastia de reducción en armonización facial: reporte de caso / Reduction genioplasty in facial harmonization: case report

Introducción: la mentoplastia es una herramienta importante en la cirugía estética del tercio inferior de la cara, permite la armonización mediante movimientos del segmento osteotomizado en diferentes planos. Objetivo: describir el análisis prequirúrgico para una mentoplastia en un paciente con anomalía esquelética y macrogenia en las dimensiones vertical y horizontal. Resultados: el análisis concluye una reducción de mentón en dos planos, un procedimiento infrecuente en el manejo quirúrgico del tercio inferior. Discusión: aunque la mayoría de las correcciones realizadas en la actualidad implican un avance o descenso del mentón en casos de retro o microgenia, es importante reconocer otras deformidades y evaluar las proporciones faciales, la oclusión dental, las mediciones cefalométricas y las imágenes fotográficas identificando las necesidades específicas de cada paciente. Conclusión: realizar una correcta identificación de la clase esquelética y un análisis estético facial permite identificar el tipo de deformidad y planificar su manejo quirúrgico.

Introduction: Sliding Genioplasty is an important tool in the aesthetic surgery of the lower third of the face, it allows the harmonization by moving the osteotomi-zed segment in different planes. Objective: to describe the pre-surgical analysis for a Genioplasty in a patient with skeletal anomaly and macrogenia in the vertical and horizontal dimensions. Results: the analysis concludes a chin reduction in two planes, an infrequent procedure in the surgical management of the lower third. Discussion: although most of the corrections made today involve an advance or descent of the chin in cases of retro or microgenia, it is important to recognize other deformities and evaluate facial proportions, dental occlusion, cephalometric measurements and photographic images identifying the specific needs of each pa-tient. Conclusion: performing a correct identification of the skeletal class and an aesthetic facial analysis allows identifying the type of deformity and planning its surgical management.

Efficacy of W-genioplasty on the broad and short chin / 中华医学美学美容杂志

Objective:To investigate the clinical effect of W-shaped genioplasty in the correction of broad and short chin deformity.Methods:Thirty-eight patients (5 males, 33 females, aged 20 to 41 years, mean 27.3 years) complained with broad and short chin were admitted to the Affiliated Friendship Plastic Surgery Hospitalof Nanjing Medical University from January 2019 to December 2021. CBCT scan and three-dimensional reconstruction were performed to design osteotomy line and determine the distance of chin lengthening, narrowing and advancing or retrocession preoperatively. Under general anesthesia, the W-shaped osteotomy was performed using an intraoral incision, and the angle between the bilateral free bone fragments, the distance of downward and forward movement were adjusted to change the curvature, width, length and prominence of the lower edge of the chin according to the preoperative designs. The results were evaluated by clinical appearances and image analyses at a follow-up of 3-24 months.Results:The amount of vertical lengthening of the chin in 38 cases were 2 mm to 5 mm, with an average of 3.02 mm. The horizontal narrowing width distances were 3-7 mm, with an average of 5.6 mm. The patients were followed up for 3-24 months, with an average of 10.6 months. There were no complications such as hematoma, wound dehiscence, accidental fracture, surgical area infection and permanent neurosensory disorder. 38 patients had transient sensory loss in the lower lip region of varying degrees, but all recovered spontaneously during routine follow-up period. All patients were satisfied with the improvement of facial contour.Conclusions:W-shaped geinoplasty preserves the central bone of the chin and the attachment of genioglossus muscle, which does not affect the normal anatomy and physiological function of the oral cavity. After osteotomy, the bone is removed and the bilateral bone fragments move flexibly. It can effectively change the radian, width, length and protrusion of the lower edge of the chin in three dimensions, so as to correct the wide and short deformity of the chin.

Changes in the airway after mentoplasty (genioplasty): systematic review / Cambios en la vía aérea después de una mentoplastia (genioplastia): una revisión sistemática

SUMMARY: The aim of this research was to evaluate the changes obtained with the mentoplasty technique in the increase of the airway imaging. A systemic review was performed using the parameters of the prism matrix, in the PubMed, Science Direct, Redalyc database, covering the years 1984 to 2019 with the use of defined inclusion criteria. The authors independently applied the selected parameter of data extraction, study selection and risk-to-bias assessment. A total of 1,251 articles were obtained among the 3 databases, of which 10 met the inclusion criteria. The variables studied were: type of research, sample size, sex, age, dento-skeletal diagnosis, airway classification, diagnosis of obstructive sleep apnea syndrome (OSAS), type of imaging evaluation, variables evaluated in the image, pre and post-operative values, surgical technique and type of fixation used, other surgical procedures applied, and complications. In the cases of linear evaluation with cephalometric analysis (9 articles) they used PAS (posterior airspace), MP-H (mandibular plane to the hyoid) and SNB (saddle-nasion-point B), and SCSA (section area as the most relevant points, smallest cross section) and VT (total volume) in the volumetric evaluations (2 articles). The average change in posterior airspace achieved by the cited authors is 4.2 mm with standard deviation of 1.4 mm with the use of advancement mentoplasty. The most widely used technique was mentoplasty with a horizontal osteotomy by 5 authors. Based on the research there is a positive relationship between the increase in the airway and the advancement mentoplasty procedure, however, more standardized studies associated with the way of measuring and evaluating the relationship between advancement and the airway are necessary.

RESUMEN: El objetivo de esta investigación fue evaluar los cambios obtenidos con la técnica de mentoplastia en el incremento de la via aérea. Una revisión sistemática fue realizada utilizando parámetros de la matriz prisma, en PubMed, Science Direct, Redalyc database, cubriendo los años 1984 a 2019 con criterios de inclusión definidos. Los autores aplicaron de forma independiente los parámetros de selección y extracción de datos, selección de estudios y riesgos de sesgo. Un total de 1251 artículos fueron obtenidos de las 3 bases de dato, donde 10 artículos cumplieron los criterios de inclusión. Las variables estudiadas fueron: tipo de investigación, tamaño de la muestra, genero, edad, diagnóstico dento esqueletal, clasificación de la vía aérea, diagnostico de síndrome de apnea del sueño (SAOS), tipo de evaluación de la imagen, variables evaluadas en la imagen en pre y postoperatorio, técnica quirúrgica y tipo de fijación utilizada, otros procedimientos quirúrgicos y complicaciones. En el caso de la evaluación linear con cefalometria (9 artículos), usaron PAS (posterior airspace), MP-H (plano mandibular hacia el hueso hioide) y SNB (silla turca-nasion- punto B) y SCSA (sección de puntos mas relevantes, menores transfversales) y el VT (volumen total) en las evaluaciones volumétricas (2 artículos). El promedio de cambio posterior de la vía aérea citado por autores fue de 4,2 mm con una desviación estándar de 1,4 mm con el uso de la mentoplastia de avance. La técnica mas habitual fue la mentoplastia con osteotomía horizontal (5 autores). Basados en esta investigación existe una relación positiva entre el incremento de la vía aérea y el avance con genioplastia; sin embargo, mas estudios estandarizados junto con medidas definidas y la evaluación correcta del avance y la vía área son necesarios.

Factors associated with the morphology of the mandibular symphysis and soft tissue chin

ABSTRACT Objectives: This study aimed to (I) assess the morphology of the symphysis and soft tissue chin associated with sex, age and sagittal/vertical skeletal patterns, and (II) identify the individual and combined contributions of these variables to different portions of the symphysis. Methods: This cross-sectional study included 195 lateral cephalometric radiographs from untreated adults. Alveolar, basal, and soft tissue of the symphysis were measured by an X/Y cranial base coordinate system, and divided in accordance to four predictor variables: sex, age, and sagittal/vertical skeletal patterns. Parametric tests were conducted for comparison and correlation purposes, while multiple regression analysis was performed to explore combined interactions. Results: Alveolar inclination is related to sagittal and vertical patterns, and both explained 71.4% of the variations. Alveolar thickness is weakly predicted and poorly influenced by age. Symphysis height was 10% higher in males, and associated with a vertical skeletal pattern and sex, and both explained 43.6% of variations. Basal symphyseal shows an individual thickness, is larger in males, and vertically short-positioned with age. Soft tissue chin is not necessarily related to the size of the underling skeletal pattern, and enlarges with age, even in adulthood. Conclusions: The symphysis and surrounding tissues are influenced by sex, age, and sagittal and vertical patterns, acting differently on the alveolar, basal and soft tissue portions. Sagittal and vertical skeletal patterns are the strongest association on alveolar symphysis inclination, whereas sex and age acts on the vertical symphysis position and soft tissues thickness.

RESUMO Introdução: O presente estudo objetivou: 1) avaliar a morfologia da sínfise mandibular e dos tecidos tegumentares do mento, associada ao sexo, idade, padrões sagital e vertical; e 2) identificar as contribuições dessas variáveis, individualmente ou combinadas, às diferentes regiões da sínfise. Métodos: Este estudo transversal incluiu 195 radiografias cefalométricas laterais de adultos não tratados ortodonticamente. Os tecidos alveolar, basal e mole da sínfise foram medidos por um sistema de coordenadas x, y e z da base do crânio e divididos de acordo com quatro variáveis preditoras: sexo, idade e padrões esqueléticos sagitais e verticais. Testes paramétricos foram conduzidos para fins de comparação e correlação, enquanto a análise de regressão múltipla foi realizada para explorar as interações combinadas. Resultados: A inclinação alveolar está relacionada aos padrões sagitais e verticais, e ambos explicaram 71,4% das variações. A espessura alveolar é fracamente prevista e pouco influenciada pela idade. A altura da sínfise foi 10% maior no sexo masculino e esteve associada ao padrão esquelético vertical e ao sexo, sendo que ambos explicaram 43,6% das variações. A sínfise basal mostra espessura individual, é maior no sexo masculino e verticalmente curta com a idade. O tecido mole do mento não está necessariamente relacionado ao tamanho do padrão esquelético subjacente e aumenta com a idade, mesmo na idade adulta. Conclusões: A sínfise e os tecidos circundantes são influenciados pelo sexo, idade e padrões sagitais e verticais, que atuam de forma diferenciada nas porções alveolar, basal e de tecidos tegumentares. Os padrões esqueléticos sagitais e verticais são a associação mais forte na inclinação da sínfise alveolar, enquanto o sexo e a idade atuam na posição vertical da sínfise e na espessura dos tecidos tegumentares.

About chin (genioplasty) surgery / Sobre cirugía del mentón (genioplastía)

Facial harmony is the consequence of a proper balance between all facial structures. The identification and classification of morphologic characteristics that detract from facial harmony is most effectively accomplished by clinical examination. The maintenance of the ratios between the facial thirds, correct spatial bone position and soft tissues accommodation are all factors that directly contribute in a balanced facial profile. The chin, likewise, contributes significantly in facial balance, mainly in the profile view. Expressive changes on chin position are associated with the perception of strong or delicate characters. Thus, over the years, a series of studies has been constructed focusing on mandibular osteotomies techniques that enable changes in chin position: advances, setback, extrusion, intrusion, widening, narrowing and asymmetry. This study aims to address historical and technical aspects of genioplasty; associating patient's condition with the surgical techniques that can be applied for correction of chin deformities.

La armonía facial es la consecuencia del balance entre las estructuras facial. La identificación y clasificación de las características morfológicas que están acompañando la armonía facial son mas efectivas al realizar un estudio de análisis facial. La obtención de promedios entre los tercios, corrección especial de la posición del hueso y la acomodación de los tejidos blandos son factores directamente involucrados en el balance del perfil. El mentón, contribuye significativamente en este balance. Cambios expresivos en la posición del mentón son asociados con la percepción de características fuertes o delicadas. Durante los años, una serie de estudios han sido desarrollados enfocándose en las osteotomías mandibulares y técnicas capaces de alcanzar los cambios en la posición del mentón: avances, retrocesos, extrusiones, ensanchamientos, estrechamientos y asimetrías. Este estudio pretende orientar las condiciones históricas y técnicas respecto de la genioplastia; la asociación de las características del paciente con la técnica quirúrgica pueden ser aplicadas para la corrección de las deformidades.

Mentoplastia em forma de asa: um novo design de osteotomia / Chin wing osteotomy: new osteotomy design

O tratamento das deformidades faciais está também associada a correção da posição do mento. O emprego de diferentes formatos de mentoplastia tem por objetivo agregar um melhor contorno, preenchimento e simetria a região anterior da mandibula e adjacente ao mento, além de permitir alinhamento da sinfise nas três dimensões. Nessa nota técnica temos por objetivo apresentar uma modificação ao procedimento convencional, mentoplastia em forma de asa, bem como sua aplicabilidade e execução... (AU)

The treatment of facial deformities is also associated with correction of the chin position. The use of different genioplasty formats aims to add a better contour, filling and symmetry to the anterior region of the mandible and adjacent to the chin, in addition to allowing alignment of the symphysis in the three dimensions. In this technical note, we aim to present a modification to the conventional procedure, chin wing osteotomy, as well as its applicability and execution... (AU)

Application of computer-assisted techniques in osseous genioplasty / 中华整形外科杂志

Objective@#To discuss the efficacy of computer aided design (CAD) and computer aided manufacturing (CAM) in the treatment of microgenia by osseous genioplasty.@*Methods@#From July 2015 to January 2018, 17 cases (Male, n=5, Female, n=12), aged from 17 to 32 years, with the meanage of 24 years, were enrolled. All patients had microgenia, and underwent osseous genioplasty. Computed tomography (CT) was performed preoperatively and 7-10 days postoperatively for all cases. Based on preoperative CT data, CAD was applied to make individualized surgical plan, surgery simulation, todetermine the movement of mentum. CAM was used to prefabricate the individualized surgical templates and transfer the CAD into intraoperative guidance. The registration of CAD and postoperative CT were performed to evaluate the surgical accuracy.@*Results@#All patients were satisfied with the surgical outcomes. The deformity of microgenia was significantly corrected. The Pg error was (0.24±0.08) mm, and the Me error was (0.15±0.17) mm.@*Conclusions@#The application of CAD increases the accuracy of surgical planning, and CAM provides areliable guidance with individualized template. Anoptimal surgical outcome can be achieved.

Balcony genioplasty: a novel technique for better esthetic results in patients with deep mentolabial fold / 대한악안면성형재건외과학회지

BACKGROUND: To introduce a novel technique for advancement genioplasty helping surgeons to avoid soft tissue difficulties especially in short-faced patients with deep mentolabial fold and everted lower lip. CASE PRESENTATION: In a trapezius-shaped, osteotomy was performed in the chin region. The mobilized segment was advanced, and the existing gap was grafted using interpositional allograft materials. Each side had been fixated by three-hole plates and two screws. The outcomes revealed no change in lower anterior teeth vitality. The patients did not report any changes of sensation in lower lip and chin either. The measurements indicated no increase in depth of mentolabial fold in patients undergoing this surgical technique. The postoperative evaluation showed a successful esthetic outcome for the patient and the surgeon concurrently. CONCLUSION: Based on our experience, the authors concluded that the Balcony technique is a simple and reliable procedure for patients with a deep mentolabial fold.

Lower facial contouring surgery using a novel method: M-genioplasty

BACKGROUND: Mandibular contouring surgery to produce a more slender and small face has become popular, especially in East Asia. Narrowing genioplasty should be simultaneously performed with mandibular angle resection to achieve satisfactory results. In Korea, T-genioplasty has been frequently performed for chin narrowing. The authors developed a new, safe, and reliable method, termed M-genioplasty, that can provide a more slender and attractive lower face. METHODS: From June 2013 to December 2017, 36 patients underwent M-genioplasty with mandibular angle resection for lower facial contouring. Horizontal and vertical osteotomies were performed obliquely. The resected bone segments were wedge-shaped. The remaining two bone segments were rotated and approximated centrally. The lateral mandible bony stepoff was trimmed off for mandibular angle resection. RESULTS: In all patients, the facial contour sufficiently improved, and most patients were satisfied with the outcome. No severe complications took place during postoperative follow-up. CONCLUSIONS: M-genioplasty can provide more mandibular angle resection and can create a more acute chin angle without bone resorption than other methods, including T-genioplasty. M-genioplasty with mandibular angle resection is a safer, more accurate, and more reliable method for lower facial contouring.

Clinical effects of en-bloc U-shaped osteotomy of the mandible in prominent mandibular angle patients with long chin / 中华医学美学美容杂志

Objective To discuss a surgical treatment to correct prominent mandibular angle with long chin.Methods From July 2015 to October 2017,21 patients with malocclusion who suffered from prominent mandibular angle with long chin underwent en-bloc mandibular U-shaped osteotomy through oralincision in order to shorten mandibular angle,the body of mandible and the chin and to improve the facial contour.We assessed the surgical effect through comparison of radiologic images,satisfaction of patients and surgical complications between pre-operation and post-operation.Results In this group,all oral incisions had healing by first intention,without hematoma,infection and osteonecrosis.Low lip numbness occurred in 16 patients.After following up for 6-12 months,the lower lip numbness was recovered in 14 patients and relieved in 2 patients.All patients satisfied with the appearance after the operation.Conclusions En-bloc mandibular U-shaped osteotomy is an improvement for mandible surgery treatment.Its osteotomy line involves the whole mandible,which makes the length and width of mandible smaller apparently.This procedure can effectively correct prominent mandibular angle with long chin.

Double jaw surgery – a modified surgical approach to treat skeletal class II

@#Patients with mandibular deficiency and skeletal class II malocclusions exhibit a wide spectrum of esthetic, cephalometric, and occlusal characteristics. The structure of chin determines facial attractiveness and is directly linked to a quality of life. Correction of dentoalveolar protrusion of maxilla is done by anterior maxillary subapical osteotomy by which anterior segment can be moved superiorly or inferiorly and posteriorly as indicated. Augmentation genioplasty is advocated to improve the overall facial esthetics of patient with mandibular deficiency. In skeletal class II malocclusions cases best results are obtained with double jaw surgery combined with the orthodontic treatment. This is a case report of skeletal class II malocclusion with mandibular deficiency and protruded maxilla in 22 year old female patient who was treated surgically by anterior maxillary subapical osteotomy and augmentation genioplasty along with the orthodontic treatment

Three-dimensional analysis of the anterior loop of the inferior alveolar nerve in relation to the growth pattern of the mandibular functional subunit / 대한악안면성형재건외과학회지

BACKGROUND: The purpose of the present study was to investigate the differences in the position and shape of the anterior loop of the inferior alveolar nerve (ALIAN) in relation to the growth pattern of the mandibular functional subunit. METHODS: The study was conducted on 56 patients among those who had undergone orthognathic surgery at the Gangnam Severance Hospital between January 2010 and December 2015. Preoperative computerized tomography (CT) images were analyzed using the Simplant OMS software (ver.14.0 Materialise Medical, Leuven, Belgium). The anterior and inferior lengths of ALIAN (dAnt and dInf) and each length of the mandibular functional subunits were measured. The relationship between dAnt, dInf, and the growth pattern of the mandibular subunits was analyzed. RESULTS: The length of the anterior portion of ALIAN (dAnt) reached 3.34 ± 1.59 mm in prognathism and 1.00 ± 0.97 mm in retrognathism. The length of the inferior portion of ALIAN (dInf) reached 6.81 ± 1.33 mm in prognathism and 5.56 ± 1.34 mm in retrognathism. The analysis of Pearson’s correlation coefficiency on all samples showed that the lengths of functional subunits were positively correlated with the loop depth. The length of the symphysis area in prognathic patients was positively correlated with the anterior loop depth (p = 0.005). CONCLUSIONS: Both the anterior and inferior length of ALIAN are longer in prognathic patients. Especially, it seems to be associated with the growth of the symphysis area.

Cortical and cancellous bone in mandibular symphysis: implications in osteosynthesis and osteotomy / Hueso cortical y esponjoso en sínfisis mandibular: implicancias en osteotomía y osteosíntesis

The aim of this study was to quantify the presence of cortical and cancellous bone in the mandibular symphysis. A descriptive study was conducted using cone beam computed tomography where skeletal class I and class III subjects were included, defined according to characteristics detected on dental, clinical and dental occlusion x-rays. From the 3D reconstruction, sections were used in relation to the axial axis of the teeth of the anterior sector; the amount of buccal cortical, cortical, lingual, inferior cortical and cancellous bone as well as symphysis height were determined. The measurements were taken using routine methods and analyzed with ANOVA and Tukey's HSD test with p <0.05 for statistical significance. 20 skeletal class I subjects aged 23 years (± 4.5) and 20 class III subjects aged 22 years (± 5.2) were included. Symphysis height was significantly greater in skeletal class III subjects, exceeding by 0.8 mm the height of class I subjects; the buccal cortical bone presented on average 2 mm less at different dental levels, whereas the lingual cortical and inferior basal bones were significantly larger than the buccal cortical bone. The cancellous and cortical bones did not present any significant differences between the two groups (p=0.093). The buccal and basilar cortical bone is smaller than lingual cortical bone.

El objetivo fue determinar la presencia de hueso cortical y esponjoso en sínfisis mandibular. Se realizó un estudio descriptivo en tomografías computadorizadas cone beam donde se analizaron sujetos clase I y clase III esqueletal definidos según características dentales, clínicas y radiográficas de oclusión dental y características radiográficas. Desde la reconstrucción 3D se utilizaron cortes en relación al eje axial de los dientes del sector anterior; en ellos se determinó la cantidad de hueso cortical bucal, cortical, lingual, cortical inferior, hueso esponjoso y altura de sínfisis. Las mediciones fueron realizadas con métodos de rutina y fueron analizados con la prueba ANOVA y HDS Turkey considerando un valor de p <0.05 para considerar significancia estadística. 20 sujetos clase I esqueletal con 23 años (+ 4.5) y 20 sujetos clase III esqueletal con edad de 23 años (+ 4.5) fueron incluidos. La altura de sínfisis fue significativamente mayor en sujetos de clase III esqueletal, superando por 0.8 mm la altura de sujetos clase I; el hueso cortical bucal presento en promedio menor de 2 mm en diferentes niveles dentarios, mientras que la cortical lingual y basal inferior fueron significativamente mayor que la cortical bucal. El hueso esponjoso y hueso cortical no presentó diferencias significativas entre ambos grupos (p=0.093). La cortical bucal y basilar son menores que el hueso cortical lingual.

Plastia del músculo mentalis una alternativa de mentoplastia en casos seleccionados / Mentalis muscle plasty an alternative genioplasty in selected cases

Introducción: la plastia del músculo mentalis (PMM) es una técnica quirúrgica para realizar mentoplastia de aumento que no requiere uso de implantes, logrando incrementar la proyección horizontal y/o vertical del mentón en pacientes seleccionados, usualmente se realiza concomitante con la rinoplastia para compensar el perfil; aunque también se puede hacer de manera aislada. Objetivos: determinar si el uso de la PMM es eficaz para incrementar la proyección del mentón, además evaluar si la proyección del mentón obtenida por esta técnica se sostiene con el paso del tiempo. Materiales y métodos: estudio observacional prospectivo, en donde se realizó PMM a 27 pacientes (20 mujeres y 7 hombres) entre los 18 a 49 años, posterior a la realización del procedimiento quirúrgico se realizó seguimiento en consulta a cada paciente por un periodo de dos años (24 meses). Resultados: en los 27 pacientes llevados a PMM, se determinó una longitud de la microgenia preoperatoria a corregir de 4,9±1,4 cm; se logró aumentar quirúrgicamente la proyección del mentón en un promedio de 4 ±0,7 cm sin uso de implantes; quedando una longitud residual de aproximadamente 1,5 ±0,9 cm, durante el seguimiento a 24 meses cada paciente aumento aproximadamente 1,5 ±0,8 cm sin cambios significativos hasta el momento del seguimiento. Conclusiones: PMM es procedimiento eficaz para la realización de mentoplastia de aumento en pacientes con microgenias leves seleccionados a partir del test de tracción positiva del mentón, los cambios producidos se sostienen hasta los dos años posterior a su realización.

Introduction: mentalis muscle plasty (MMP) is a surgical technique for genioplasty without the use of fillers, thereby increasing the horizontal or vertical chin projection in selected patients, usually performed concomitantly with rhinoplasty to compensate the profile; although it can also make isolation. Objectives: To determine whether the use of the mentalis muscle plasty is effective in increasing chin projection in selected cases also determine whether chin projection obtained by this technique is sustained over time. Materials and Methods: A prospective observational study, where plasty of the mentalis muscle was performed in 27 patients (20 women and 7 men) between 18 to 49 years, after the completion of the surgical procedure monitoring in consultation with each patient was performed by a period of two years (24 months). Results: In the 27 patients who underwent plasty of the mentalis muscle length microgenia correct preoperative was determined in 4.9 ± 1.4 mm; was achieved surgically increase the projection of the chin in an average of 4 ± 0.7 mm without the use of implants; leaving a residual length of about 1.5 ± 0.9 mm, while monitoring each patient 24 months increased about 0.4 ± 0.5 mm without significant changes until the time of follow-up. Conclusions: plasty of the mentalis muscle is an effective to perform genioplasty in patients with mild microgenias selected from test positive traction chin procedure, performing this surgical technique does not require the use of implants and changes they hold up to two years from its completion

Genioplasty with modified Mortise-Tenon joints technique / 中华医学美学美容杂志

Objective To explore a new modified stable genioplasty with modified MortiseTenon joints technique and to analyze the surgicaI results in clinic as well as to discuss the advantages in theory.Methods Eleven patients were performed by the genioplasty with Mortise-Tenon joints technique intraoral approach from June 2012 to March 2014,who were suffered from retrusion of chin with different degree accompanying with long chin.The two segments of the chin by osteotomy were made into the Mortise-Tenon joints and fixed by titanium plates.The results were evaluated by clinical appearances and image analyses.Results All 11 patients were satisfied with the procedure and the contour of the chin.The surgical effects were stable without any complications.The advancement in average Mortise-Tenon joints technique was 7.38 mm.Conclusions Much better in stablility and less relapse are achieved by using modified Mortise-Tenon joints technique;furthermore,the genioglossal muscle and geniohyoid muscle are reserved as much as possible,and therefore the normal function of them could be maintained.This method is a good alternative technique for chin retrusion coexisted withlong chin.

Clinical efficacy of genioplasty for deformities of the chin / 中华医学美学美容杂志

Objective To analyze the clinical efficacy and technical key points of genioplasty for the deformities of the chin.Methods 153 patients with chin deformities were treated with the genioplasty,and the chin was moved in any direction,including sagittally,vertically and transversely;the key points of this procedure were summarized.Results There was no severe complication such as infection or nonunion observed.15 patients had ecchymosis and faded in 2 weeks;33 patients had hypaesthesia and recovered in 12 weeks.With the 12-24 months follow-up,all the patients healed well with satisfactory aesthetic results.Conclusions The genioplasty is a reliable and efficient method for the deformities of the chin,and it can significantly improve the appearance of the chin.

Clinical evaluation for chin augmentation: literature review and algorithm proposal / Avaliação clínica para avanço de mento: revisão da literatura e proposta de um algoritmo

ABSTRACT INTRODUCTION: The esthetic balance of the face results from harmonic and symmetrical facial proportions. The literature describes several methods for lower-third facial analysis, but lacks a simple and practical method. OBJECTIVE: To review the methods of analysis of the ideal projections of the chin based on soft tissues, showing the advantages and disadvantages of each. METHODS: Literature review through the PubMed database. RESULTS: The following methods for chin analysis based on soft tissues were reviewed: Gonzalles-Ulloa, Goode, Merrifield, Silver, Legan, Gibson & Calhoun, cervicomentual angle, and mentocervical angle. CONCLUSION: An adequate analysis of the proportions of the face and facial disharmony is essential for the correct indication of the necessary procedures and good surgical outcome. The authors propose an algorithm to facilitate the indication for chin augmentation surgery.

Resumo Introdução: O equilíbrio estético da face resulta de proporções faciais harmônicas e simétricas. A literatura descreve vários métodos de análise do terço inferior da face, mas carece de um método simples e prático. Objetivo: Revisar os métodos de análise da projeção ideal do mento baseadas em tecidos moles, mostrando as vantagens e desvantagens de cada um. Método: Revisão da literatura através da base de dados Pubmed. Resultados: Os seguintes métodos para análise do mento baseada em partes moles são revisados: Gonzalles-Ulloa, Goode, Merrifield, Silver, Legan, Gibson & Calhoun, ângulo cervicomentual e ângulo mentocervical. Conclusão: A análise adequada das proporções da face e desarmonia facial faz-se essencial para a correta indicação dos procedimentos necessários e bom resultado cirúrgico. Propomos um algoritmo para facilitar indicação de avanço de mento.

Frecuencia de genioplastia en cirugía ortognática en el servicio de cirugía oral y maxilofacial del Hospital Militar Central de Bogotá / Genioplasty frequency in orthognathic surgery at the Bogota Central Military Hospital oral and maxillofacial surgery service

Introducción: La genioplastia es un procedimiento versátil que maneja alteraciones en la región mentoniana, aisladas o en combinación con Anomalías Dentofaciales (ADF). Objetivo: Describir la frecuencia de genioplastia así como los diferentes métodos de fijación utilizados en pacientes sometidos a cirugía ortognática. Materiales y métodos: Estudio observacional descriptivo de los pacientes sometidos genioplastia en conjunto con cirugía ortognática en el Servicio de Cirugía Oral y Maxilofacial del Hospital Militar Central de Bogotá entre 2009 y 2015. Resultados: El 80% de las cirugías ortognáticas (197 pacientes) requirieron genioplastia como procedimiento complementario. El movimiento más frecuente fue de avance en 158 pacientes (77.8%) con predominio de pacientes ADF Clase III (91 pacientes, 44.82%), el método de fijación mas frecuente fue alambres intraóseos en el 37.05% (73 casos). Conclusiones: La genioplastia es un procedimiento predecible, con bajo riesgo de complicaciones, que maneja los defectos anatómicos y estructurales del mentón, ofreciendo resultados estéticos favorables..

Introduction: Genioplasty is a versatile procedure which handles defects of the chin, isolated or in combination with Dentofacial Deformities (DFD). Objective: To describe the frequency of genioplasty and the different methods of fixation used in patients undergoing orthognathic surgery. Materials and methods: Descriptive observational study of patients undergoing genioplasty in conjunction with orthognathic surgery at the Bogotá Central Military Hospital, Oral and Maxillofacial Department from January 2009 to January 2015. Results: 80% of orthognathic surgery (197 patients) required genioplasty as adjunctive procedure. The most frequent movement was advance genioplasty in 158 patients (77.8%), prevalence of DFD Class III (91 patients, 44.82%), the most frequent method was intraosseous wire fixation in 37.05% (73 cases). Conclusions: Genioplasty is a predictable procedure with low risk of complications, which handles anatomical and structural defects of the chin, offering favorable aesthetic results.