Avanço cirúrgico de maxila e ressonância de fala: comparação entre os tipos de fissura / Surgical maxillary advancement and speech resonance: comparison among cleft types

RESUMO Objetivo Investigar a influência do tipo de fissura sobre o aparecimento da hipernasalidade após o avanço cirúrgico da maxila (AM). Método A nasalidade foi determinada por meio da medida de nasalância (correlato acústico da nasalidade) utilizando-se a nasometria. Foi realizada a análise dos escores de nasalância de 17 indivíduos com fissura isolada de palato (FP), 118 com fissura de lábio e palato unilateral (FLPU) e 69 com fissura de lábio e palato bilateral (FLPB), de ambos os sexos, com idades entre 18 e 28 anos, submetidos ao AM. Apenas indivíduos com escores de nasalância indicativos de ressonância equilibrada previamente ao AM foram incluídos neste estudo. A nasometria foi realizada, em média, três dias antes e 15 meses após o AM. A proporção de pacientes que apresentaram escores de nasalância indicativos de hipernasalidade após o AM foi calculada por meio do teste ANOVA e a comparação entre os diferentes tipos de fissura foi realizada utilizando-se o teste Qui-quadrado (p < 0,05). Resultados Não foi observada diferença significante entre as proporções de indivíduos com hipernasalidade, de acordo com o tipo de fissura. Conclusão A nasometria mostrou que o aparecimento da hipernasalidade após o AM, em indivíduos com fissura de palato envolvendo ou não o lábio, ocorreu em proporções similares independentemente do tipo de fissura.

ABSTRACT Purpose This study investigated the influence of the cleft type on the appearance of hypernasality after surgical maxillary advancement (MA). Methods Nasality was determined by measurement of nasalance (acoustic correlate of nasality) by nasometry. The study involved analysis of the nasalance scores of 17 individuals with isolated cleft palate (CP), 118 with unilateral cleft lip and palate (UCLP) and 69 with bilateral cleft lip and palate (BCLP), of both sexes, aged 18 to 28 years, after MA. Only individuals with normal nasalance scores indicating balanced resonance before MA were included in this study. Nasometry was performed 3 days before and 15 months after MA, on average. The proportion of patients who presented nasalance scores indicating hypernasality after surgery was calculated by the ANOVA test, and comparison among the different cleft types was evaluated by the chi-square test (p < 0.05). Results No significant difference was found in the proportions of individuals with hypernasality among the cleft types. Conclusion Nasometry showed that the appearance of hypernasality after MA in individuals with cleft palate with or without cleft lip occurred in similar proportions, regardless of the cleft type.

Consideraciones anestésicas en hipercapnia intraoperatoria, a propósito de un caso / Case report: Anesthetic considerations in intraoperative hipercapnia

Hypercapnia during the intraoperative period is one of the relevant conditions for the anesthesiologist, which can even condition the anesthetic technique, in case of an eventual complication. Where ventilatory monitoring and the interpretation of said disorder allows to diagnose, plan and treat the physiological consequences in the patient. We present the case of a 20 year old patient, scheduled for orthognathic surgery for diagnosis of mandibular body fracture, without added pathologies, no chest trauma, no ventilation disorders. It is presented with the objective of discussing the different considerations to be taken before the progressive establishment of hypercapnia, its causes, consequences and its management.

La hipercapnia durante el intraoperatorio es una de las condiciones relevantes para el anestesiólogo, la cual puede incluso condicionar la técnica anestésica ante una eventual complicación. Donde la monitorización ventilatoria y la interpretación de dicho trastorno permite diagnosticar, planificar y tratar las consecuencias fisiológicas en el paciente. Presentamos el caso de una paciente de 20 años programada para cirugía ortognática por diagnóstico de fractura de cuerpo mandibular, sin patologías añadidas no traumas torácicos, no trastornos de ventilación. Se presenta con el objetivo de discutir las diferentes consideraciones a tomar ante la instauración progresiva de hipercapnia sus causas, consecuencias así como su manejo.

Incidencia de tromboembolismo venoso en cirugía ortognática / Incidence of venous thromboembolism in orthognathic surgery

Introducción: El tromboembolismo venoso (TEV) es una causa importante de morbimortalidad en la población hospitalaria y quirúrgica. Esta entidad tiene mecanismos fisiopatológicos bien definidos y descritos, además, de factores de riesgo que permiten una clasificación de los pacientes según diversos modelos de valoración, los cuales permiten adoptar medidas profilácticas. En el ámbito de la cirugía maxilofacial se han descrito bajos niveles de incidencia. Sin embargo, hay evidencia bastante limitada y representa un problema de salud al cual se le ha prestado poca atención en la literatura. Objetivo: El presente estudio tiene como objetivo conocer la incidencia de tromboembolismo venoso en pacientes sometidos a cirugía ortognática. Material y Método: Se evaluaron en forma retrospectiva fichas clínicas de 86 pacientes operados de cirugía ortognática entre octubre de 2006 y enero de 2016 en el Hospital Clínico de la Pontificia Universidad Católica de Chile. Se identificaron 2 casos de tromboembolismo pulmonar, lo cual corresponde a una incidencia de 2,6%. Sin embargo, no se obtuvo un espacio muestral suficiente para lograr identificar factores de riesgo específicos en esta población. Conclusiones: A pesar de la baja incidencia de TEV en pacientes sometidos a cirugía maxilofacial, es fundamental considerar el riesgo individual del paciente y el riesgo que implica la cirugía. La prolongación del tiempo quirúrgico, la estadía hospitalaria y la inmovilización prolongada pueden determinar un riesgo mayor de desarrollar este tipo de complicación, por lo tanto, es necesario considerarla y saber prevenirla de manera adecuada.

Introduction: Venous thromboembolism (VTE) is an important cause of morbidity and mortality in surgical patients. This entity has well defined and described pathophysiological mechanisms, in addition to risk factors that allow a classification of patients according to different assessment models, which allow to adopt prophylactic measures. In maxillofacial surgery, low levels of incidence have been described. However, there is quite limited evidence and represents a health problem that has received little attention in the literature. Objective: To determine the incidence of venous thromboembolism in patients undergoing orthognathic surgery. Material and Method: Retrospectively, 86 patients who underwent orthognathic surgery was evaluated between October 2006 and January 2016 at the Hospital Clínico de la Pontificia Universidad Católica de Chile. Two cases of pulmonary thromboembolism were identified, which corresponds to an incidence of 2.6%. Despite the low incidence of VTE in patients undergoing maxillofacial surgery, it is essential to consider the individual risk of the patient and the risk involved in surgery. The prolongation of surgical time, the hospital stay and prolonged immobilization can determine a greater risk of developing this type of complication, therefore it is necessary to consider it and know how to prevent it in an adequate way.

Frecuencia, severidad y ubicación de erupciones acneiformes en hombres y mujeres tras una cirugía ortognática: estudio descriptivo longitudinal / Frequency, severity and location of acneiform eruptions in men and women after orthognathic surgery: longitudinal descriptive study

Describir la frecuencia de erupciones acneiformes y/o exacerbaciones de un acné previo tras una cirugía ortognática. La muestra consta de 57 pacientes (n=57) de ambos sexos, sometidos a una cirugía ortognática, los cuales fueron evaluados en: el preoperatorio (0-7 días previos); en distintas etapas de la cirugía; postoperatorio inmediato (7 ­ 15 días post cirugía) y postoperatorio mediato (30 ­ 40 días postquirúrgicos). En todos los controles clínicos mencionados se determinó la presencia/ausencia, ubicación, severidad y diagnóstico de las erupciones acneiformes. El 52,6 % de los pacientes sometidos a cirugía ortognática presentaron erupciones acneiformes, siendo mayores en las mujeres en comparación con los hombres. La severidad de las erupciones acneiformes es mayor en el postoperatorio inmediato en comparación al preoperatorio y postoperatorio mediato. La ubicación más frecuente del acné corresponde a la región frontal, tanto en el preoperatorio (22,8 %) como en el postoperatorio inmediato (31,6 %). En el postoperatorio mediato la zona más frecuente es la geniana (39 %). La frecuencia de acné post cirugía ortognática es elevada, siendo mayor en mujeres que en hombres. La severidad de este acné es mayor en el postoperatorio inmediato. La región frontal corresponde a la zona más frecuente de aparición de las erupciones acneiformes en el postoperatorio inmediato y la zona geniana en el postoperatorio mediato. El diagnóstico de estas erupciones acneiformes corresponde a un acné esteroidal, por lo que se puede sugerir un posible plan de tratamiento, con el fin de mejorar el postoperatorio de las pacientes y evitar, en lo posible, futuras manifestaciones en nuevas pacientes sometidas a este tipo de cirugía.

Describe the frequency of acneiform eruptions and / or exacerbations of a previous acne after orthognathic surgery. The sample consisted of 57 patients (n = 57) of both genders, undergoing orthognathic surgery, who were evaluated with a follow-up of 2 postoperative months, at different stages of surgery; Preoperative (0-7 days), immediate postoperative (7-15 days) and mediate postoperative (30-40 days). The presence / absence, location, severity and diagnosis of acneiform eruptions were determined in all clinical controls. The frequency of acneiform eruptions corresponds to 52.6 % of patients undergoing orthognathic surgery, being higher in women compared to men in relation to the presence of acneiform eruptions and / or exacerbations of a previous acne after the intervention. The severity of acneiform eruptions is greater in the immediate postoperative period compared to the preoperative and mediate postoperative period. The most frequent location to be found in the facial region is in the frontal area, both in the preoperative (22.8 %) and in the immediate postoperative period (31.6 %). In the postoperative period, the most frequent is the genial area (39 %). The appearance of acneiform eruptions corresponds to steroidal acne. The frequency of acne post orthognathic surgery is high, being higher in women than in men. The severity of this acne is greater in the immediate postoperative period. The frontal region corresponds to the most frequent area of onset of acneiform eruptions in the immediate postoperative period and the genial area in the postoperative period. The diagnosis of these acneiform eruptions corresponds to a steroidal acne, so it is possible to suggest a possible treatment plan, in order to improve the postoperative of the patients and to avoid, as far as possible, future manifestations in new patients undergoing this type of surgery.

Mucocele maxilar secundario a cirugía ortognática: reporte de un caso / Maxillary mucocele after an orthognathic surgery: case report

El mucocele es un tumor pseudoquístico poco frecuente en el seno maxilar y una rara complicación de la cirugía ortognática. El caso reportado describe la presentación de un mucocele que afecta parcialmente el seno maxilar y se presenta clínicamente como un tumor nasal. Se trata de una mujer de 44 años que, luego de 12 años de realizarse cirugías ortognáticas, presenta dolor facial y obstrucción de la fosa nasal derecha. La tomografía axial computarizada de senos paranasales revela una masa de contenido líquido que ocupa la mitad inferior del seno maxilar derecho, extendiéndose a la fosa nasal ipsilateral. La paciente es intervenida por vía endoscópica realizándose una marsupialización intranasal y meatotomía media, evolucionando satisfactoriamente en un seguimiento de dos años.

Mucoceles are not often found in the maxillary sinus, and is a rare surgery complication, in this case, orthognathic. This review describes a mucocele that partially occupies the right maxillary sinus, causing a chronic nasal obstruction. This is the case of a 44 year-old female patient, which after 12 years of several orthognathic surgeries, presents facial pain and right nasal obstruction. The paranasal sinus computed tomography reveals a mass with liquid content that occupies the lower part of the right maxillary sinus and compromises the right nasal cavity. The patient was treated with an intranasal marsupialization and a middle meatotomy with endoscopic nasal approach. Evolution was satisfactory two years after the intervention.

Riesgo de infección del sitio quirúrgico, según tiempo operatorio en cirugía maxilofacial mayor limpia contaminada: estudio observacional analítico / Risk of surgical site infection according to operating time in major clean-contaminated maxillofacial surgery. Observational analytical study

Introducción: La infección del sitio quirúrgico (ISQ) sigue generando gran morbimortalidad, a pesar de los avances en control de infecciones y técnicas quirúrgicas. Objetivos Determinar si en cirugía maxilofacial mayor limpia contaminada el aumento del tiempo operatorio incrementa la proporción de infección del sitio quirúrgico. Materiales y método Estudio observacional analítico en pacientes ASA I intervenidos en cirugía maxilofacial mayor limpia contaminada entre los años 1997 y 2010 en el Hospital Clínico San Borja Arriarán (Santiago, Chile). Las variables medidas fueron género, edad, tiempo operatorio e ISQ. Se realizó un análisis estadístico mediante prueba de Chi cuadrado, test de la t de Student y regresión logística simple, con un IC del 95 por ciento y el paquete estadístico SPSS. Resultados De un total de 522 pacientes presentaron ISQ 36 (6,9 por ciento). Al comparar los 2 grupos, con ISQ y sin ISQ, no hubo diferencias significativas según género (p = 0,319) y edad (p = 0,238), pero sí según tiempo operatorio (p = 0,046). Se obtuvo un OR = 1,003 (IC 95 por ciento = 1,000-1,006) entre el tiempo operatorio y la infección del sitio quirúrgico. Conclusión Se encontraron diferencias significativas en la proporción de ISQ al aumentar el tiempo operatorio. Sin embargo, esta asociación no es clínicamente significativa.

Introduction: Despite advances in infection control and surgical techniques, surgical site infection (SSI) continues to be a cause of high morbidity and mortality. Objectives To determine if operating time increases the proportion of surgical site infections in clean-contaminated maxillofacial surgery. Materials and method This was an observational analytical study, including ASA I patients undergoing clean-contaminated maxillofacial surgery between 1997 and 2010 at the Clinical Hospital San Borja Arriarán (Santiago, Chile). The outcome variable was surgical site infection. Predictor variables were gender, age, operating time and SSI. Statistical analysis was performed using chi-squared test, Student t test, and simple logistic regression. Results A total of 522 patients met the inclusion criteria. The infection rate was 6.9 percent. Statistically significant differences were only observed in the operation time (P = .046) with an Odds ratio of 1.003 (95 percent CI = 1.000-1.006). Conclusion Significant differences in the proportion of SSI were found when operation time increased. However, this association is not clinically significant.

Complicaciones en cirugía ortognática: conceptos actuales y revisión de la literatura / Complications in orthognathic surgery: current concepts and review of the literature

La cirugía ortognática es el tratamiento de elección para corregir deformidades dentofaciales congénitas o adquiridas en menor cantidad de casos, estas técnicas pueden ser aplicadas en la resección de tumores y apnea del sueño. Usualmente se lleva a cabo entre la segunda y tercera década de vida. Dentro de los benefi cios que se obtienen se incluyen una mejor función masticatoria, resultados estables en discrepancias dentofaciales severas y un mejor aspecto estético facial. Sin embargo, aun el cirujano más experimentado puede enfrentar complicaciones, entre las que destacan las vasculares, técnicas, nerviosas, periodontales, infecciosas, oftálmicas, de oclusión, psicológicas y necrosis ósea. Algu-nas de estas complicaciones pueden discutirse en detalle con el paciente antes del procedimiento. A pesar de lo anterior, el tratamiento de cirugía ortognática puede ser considerado como un procedimiento seguro. Las complicaciones se pueden dividir en preoperatorias, transoperatorias y postoperatorias, teniendo en las dos últimas una mayor incidencia.

Orthognathic surgery is the treatment of choice for the correction of congenital or acquired dentofacial deformities; in a minority of cases, the techniques involved can be applied to tumor resection and to treat sleep apnea. This type of surgery is usually performed between the second and third decades of life. The benefi ts obtained include a better chewing function, stable results in severe dentofacial anomalies, and improved facial aesthetics. However, even the most experienced surgeon can encounter a range of issues, most notably vascular, technical, ner-vous, periodontal, infectious, ophthalmic, psychological, those related to occlusion, and bone necrosis. Some of these can be discussed in detail with the patient prior to the procedure. Nevertheless, orthognathic surgery treatment can be considered a safe procedure. Complications can be classifi ed into three types: preoperative, intraoperative, and postoperative, the latter two being the most common.

Estudo das alterações volumétricas faríngeas após cirurgia ortognática em pacientes classe III e sua influência no desenvolvimento da apneia obstrutiva do sono / Study of pharyngeal volumetric changes after orthognathic surgery in class III patients and its influence in obstructive sleep apnea

A cirurgia ortognática para correção da maloclusão dentária classe III gera modificações na via aérea faríngea (VAF) que podem predispor à Síndrome da Apneia Obstrutiva do Sono (SAOS). O objetivo deste estudo foi avaliar, através de tomografia computadorizada por feixe cônico, as modificações imediatas na VAF de pacientes classe III submetidos à cirurgia ortognática, verificando sua influência no desenvolvimento da SAOS, e correlacionando o movimento do osso hióideo com as modificações na VAF. Foi utilizado para diagnóstico da SAOS o questionário de Berlim, a escala de Sonolência de Epworth e alguns sintomas sugestivos através de 2 entrevistas, uma antes e outra 6 meses após a cirurgia. Realizou-se um estudo prospectivo com 33 pacientes divididos em 3 grupos: recuo de mandíbula isolado (9 pacientes), cirurgia maxilomandibular (18 pacientes) e avanço de maxila isolado (6 pacientes). As medidas obtidas da VAF no pré e no pós-operatório foram comparadas utilizando o teste t pareado, enquanto a correlação entre osso hióideo e as modificações da VAF foram analisadas através do coeficiente de correlação de Spearman. O grupo de pacientes submetidos ao recuo de mandíbula isolado apresentou alterações morfológicas mais pronunciadas, com redução no volume total da VAF, no volume da hipofaringe e na área de maior constrição (p<0,05). Observou-se uma correlação positiva forte entre o deslocamento horizontal do osso hióideo e a diminuição da área de maior constrição (r=0,712). O exame clínico não diagnosticou a SAOS em nenhum dos pacientes após 6 meses da cirurgia. O estudo não encontrou evidências de que a cirurgia ortognática para correção da maloclusão classe III predispõe à SAOS.

The orthognathic surgery for correction class III malocclusion, generates changes in the pharyngeal airway space (PAS) which may predispose to obstructive sleep apnea syndrome (OSAS). The objective of this study was to evaluate, through cone beancomputed tomography, theimmediate changes in the PAS in Class III patients submitted to orthognathic surgery, evaluating the influence of surgery in the development of OSAS, and correlating the position of the hyoid bone with measurements of PAS.For diagnosis of OSAS, Berlin questionnaire, Epworth Sleepiness Scale, and some characteristics symptoms, were searched through 2 interviews, one before surgery, and another 6 months after.This prospective study included 33 patients divided into 3 groups: mandibular setback surgery (9 patients), bimaxillary surgery (18 patients) and maxillary advancement surgery (6 patients). The measures obtained from the PAS pre- and postoperatively were compared using paired t test, and the correlation between the hyoid and PAS measurements, using the Spearman correlation coefficient. Patients undergoing mandibular setback surgery showed more pronounced morphological changes,with a decrease in the total volume of the PAS, in the volume of the hypopharynx, and in minimum cross-sectional area (p <0.05). There was a strong correlation between the horizontal displacement of the hyoid bone and reduction ofminimum cross-sectional area (r = 0.712). Clinical analysis did not diagnose OSAS in any patients 6 months after surgery. There was no evidence that orthognathic surgery, for correction of malocclusion class III, predispose to OSAS.

Distúrbios neurossensoriais associados ao nervo alveolar inferior após a osteotomia vertical intraoral dos ramos mandibulares / Neurosensory disturbances of the inferior alveolar nerve after intraoral vertical ramus osteotomy

O objetivo deste estudo foi avaliar os índices de lesão ao nervo alveolar inferior (NAI), após a realização da osteotomia vertical intraoral dos ramos mandibulares (OVIRM) para correção do prognatismo mandibular, comparando-os com os relatos da literatura. A amostra foi composta de dez pacientes, escolhidos aleatoriamente, submetidos à OVIRM, associada ou não à osteotomia da maxila. Não houve casos de danos ao NAI na amostra após um ano de acompanhamento. A OVIRM demonstrou ser uma técnica cirúrgica segura e previsível em relação ao NAI, desde que suas peculiaridades sejam respeitadas.

The aim of this study was to evaluate the impairment in the inferior alveolar nerve (IAN) after performing the intraoral vertical ramus osteotomy (IVRO) for the correction of mandibular prognathism, and compare with the literature reports. The sample was composed of ten patients, randomly chosen, undergoing OVIO, associated or not to the maxillary osteotomy. There were no cases of impairment to the IAN after one year of follow-up. The OVIO proved to be a safe and predictable surgical technique as long as its peculiarities are respected.

Condylar resorption after orthognathic surgery: a systematic review / Reabsorción condilar después de cirugía ortognática: una revisión sistemática

The aim of this research was to evaluate the risk factors related to condylar resorption (CR) after orthognathic surgery. Was realized a systematic review with a search of the literature performed in the electronic databases PubMed, MedLine, Ovid, Cochrane Library for current evidence in the world literature as conducted, and relevant articles were selected in according to inclusion and exclusion criteria and the findings were compared. Eight papers, (follow-up 12 months to 69 months) were including. A sample of 2567 patient with mandible or bi maxillary surgery with an age range from 14 to 46 year old was observed. In 137 patients (5.3 percent) CR was observed , with a 97.6 percent (122) female. CR was related to 118 cases with mandibular deficiencies with high mandibular plane (advancement surgery). CR were present principally in bi maxillary surgery with a 103 cases (75.2 percent) and only two papers show any analysis to the relation with TMJ dysfunction. Current evidence in CR is poor but supports those female patients with mandibular deficiency and high mandibular plane angle submitted to bi maxillary surgery with change in occlusal plane (counterclockwise) are associated with condylar resorption after orthognathic surgery...

El objetivo de esta investigación fue evaluar los factores de riesgo asociados a reabsorción condilar (RC) posterior a cirugía ortognática. Fue realizada una revisión sistemática con una búsqueda de la literatura realizada en bases de dato electrónicos como PubMed, MedLine, Ovid, Cochrane Library buscando actual evidencia en la literatura mundial; artículos relevantes fueron seleccionados según los criterios de inclusión y exclusión, comparando sus resultados. Ocho artículos (tiempo de seguimiento de 12 a 69 meses) fueron incluidos. Se observó una muestra de 2567 pacientes con cirugía mandibular o bimaxilar con una edad de entre 14 y 46 años. En 137 pacientes (5,3 por ciento) se observó reabsorción condilar, siendo el 97,6 por ciento (122 casos) de sexo femenino. La RC fue observada n 118 casos de deficiencia mandibular con un plano mandibular alto (cirugía de avance mandibular). La RC estuvo presente principalmente en cirugías bimaxilares con 103 casos afectados (75,2 por ciento) y solo dos artículos evidenciaron análisis previo de disfunción de ATM. Actualmente la evidencia en RC es limitada pero fundamenta que mujeres con deficiencia mandibular y alto plano mandibular sometidas a cirugía bimaxilar con alteración del plano oclusal (giro horario) son asociadas a la reabsorción condilar después de la cirugía ortognática...