Como Predecir el Cambio del Tejido Blando Facial Luego de Cirugía Ortognática. Una Revisión de la Literatura

RESUMEN: Habitualmente los pacientes buscan estética en un tratamiento de ortodoncia, y al tener que someterse a una cirugía ortognática, lo que más les preocupa es cómo se verán luego de ésta. Hoy en día existe variados softwares para mostrar una imagen virtual del resultado del tejido esquelético y blando luego de una cirugía, pero no se ha llegado a consenso de que tan fiables son, ya que cada ortodoncista puede utilizar distintos métodos de medición. En este estudio queremos realizar una revisión bibliográfica para evaluar el efecto de la cirugía Lefort I y sagital bilateral de rama sobre el tejido blando del tercio medio e inferior en pacientes que han tenido tratamiento ortodóncico. Para así, en un futuro, poder predecir el comportamiento del tejido blando a través del tratamiento quirúrgico.

ABSTRACT: Usually patients seek aesthetics in orthodontic treatment, and having to undergo orthognathic surgery, what they are most concerned about is how they will look after it. Nowadays there are various softwares to show a virtual image of the result of skeletal and soft tissue after surgery, but no consensus has been reached on how reliable they are, since each orthodontist can use different measurement methods. In this study, we want to carry out a bibliographic review to evaluate the effect of Lefort I and bilateral sagittal branch surgery on the soft tissue of the middle and lower third in patients who have undergone orthodontic treatment. Thus, in the future, to be able to predict the behavior of soft tissue through surgical treatment.

Assessment of relapse of skeletal open bite treatment in adult patients treated with molar intrusion using temporary anchorage devices and orthognathic surgery - a systematic review / Avaliação da recidiva do tratamento da mordida aberta esquelética em pacientes adultos tratados com intrusão molar utilizando dispositivos de ancoragem temporária e cirurgia ortognática - uma revisão sistemática

Objetivo: O objetivo deste estudo é avaliar sistematicamente as evidências disponíveis para recidiva do tratamento da mordida aberta esquelética usando dispositivos de ancoragem temporária e cirurgia ortognática. Material e Métodos: Cinco bases de dados eletrônicas como MEDLINE, COCHRANE, SCIELO, GOOGLE SCHOLAR, EMBASE foram pesquisadas sistematicamente até junho de 2020. Os estudos de qualidade metodológica foram classificados por meio da Ferramenta de Avaliação de Qualidade do Projeto de Práticas de Saúde Pública Eficazes (EPHPP). Resultados: No total, 1.005 estudos foram identificados para triagem e 6 estudos foram elegíveis. O instrumento de avaliação da qualidade apresentou qualidade moderada para todos os estudos. A correção imediata pós-tratamento da mordida aberta foi melhor nos estudos cirúrgicos do que nos estudos tratados com TADs. Conclusão: A estabilidade dos resultados do tratamento da mordida aberta anterior foi comparável nos casos tratados em ambas as modalidades de tratamento. A recidiva da mordida aberta anterior foi associada a casos em que a sobremordida pós-tratamento foi mínima. A sobremordida parece ser mais estável quando apenas a maxila foi operada do que com cirurgias bimaxilares. A rotação anti-horária da mandíbula com subsequente redução da altura facial anterior foi melhor na correção cirúrgica do que através de TADs (AU)

Objective: The purpose of this study is to systematically assess the available evidence for relapse of skeletal open bite treatment using temporary anchorage devices and orthognathic surgery. Materials and Methods: Five electronic databases such as MEDLINE, COCHRANE, SCIELO, GOOGLE SCHOLAR, EMBASE were systematically searched up to June 2020. Methodological quality studies were graded by means of the Effective Public Health Practice Project (EPHPP) Quality Assessment Tool. Results: In total, 1005 studies were identified for screening, and 6 studies were eligible. The quality assessment tool showed moderate quality for all the studies. The immediate post treatment correction of open bite was better in the surgical studies than in the studies treated with TADs. Conclusion: Stability of treatment results of anterior openbite was comparable in cases treated in both the treatment modalities. Relapse of anterior open bite was associated with cases in which the posttreatment overbite was minimal. Overbite seems to be more stable when only the maxilla has been operated on than with bi-maxillary surgeries. Counterclockwise rotation of the mandible with subsequent reduction of anterior facial height was better in surgical correction than through TADs. (AU)

Establishment of a three-dimensional coordinate system for measuring the recurrence rate after orthognathic surgery and evaluation and analysis of the degree of recurrence / 口腔疾病防治

Objective@# To establish a three-dimensional coordinate system that can accurately measure the recurrence rate after orthognathic surgery, and evaluate and analyze the degree of recurrence.@*Methods @#Data from patients who underwent orthognathic surgery in a hospital were selected to reconstruct three-dimensional images with spiral CT. The two researchers used the multiplane assisted positioning method to fix the points three times and screened them using intra-andintreclass correlation coefficients (ICC). Reproducible and accurate landmark points were drawn to establish different coordinate systems and calculate the facial asymmetry index (AI) to determine the coordinate system with the best mid-sagittal plane symmetry. This coordinate system and lateral radiographs were used to separately measure the recurrence rate, and evaluate and analyze the three-dimensional recurrence degree of orthognathic surgery.@*Results @#Ten landmark points that may be repeatedly fixed were obtained, including N (nasion), K (K point), ANS(anterior nasal spine), PNS (posterior nasal spine), Ptm(pterygomaxillary fissure), Gn (gnathion), IZ(IZ point), MZ (MZ point), Ms (mastoideale), Cor (coronion) and and Go (gonion). Three coordinate systems were established, and the most suitable coordinate system was the upper edge point of the left infraorbital foramen. The inner upper edge of the right infraorbital foramen and both sides of the midpoint of the ear points constituted the horizontal plane (HP), which passed through the outermost point of the left zygomatic frontal suture and the outermost point of the right zygomatic frontal suture and was perpendicular to the horizontal plane to constitute the coronal plane (CP). It was perpendicular to the two planes to form a sagittal plane (SP). Two-dimensional and three-dimensional measurements of recurrence were performed on 112 patients, and new three-dimensional recurrence evaluation results were obtained. Less than 40% had low recurrence, 40% to 61% had moderate recurrence, and greater than 61% had high recurrence.@*Conclusion@#This study established a three-dimensional coordinate system suitable for measuring the recurrence rate after orthognathic surgery, obtained a new three-dimensional recurrence evaluation result, and provided a clinical experimental basis for evaluating the effect of orthognathic surgery and improving stability.

A orientação psicanalítica de Rosine e Robert Lefort na clínica do sujeito / La orientación psicoanalítica de Rosine y Robert Lefort en la clínica del sujeto / The psychoanalytic orientation of Rosine and Robert Lefort in the subject's clinic

O artigo aborda a orientação psicanalítica de Rosine e Robert Lefort e tem por objetivo colocar em primeiro plano as contribuições desses dois autores no desenvolvimento de novos horizontes práticos para a psicanálise lacaniana. O artigo resgata assim a originalidade de sua obra, refletindo sobre os princípios essenciais que a norteiam e que permitem a ampliação do discurso analítico a domínios até então julgados refratários ao seu tratamento. Para tanto, o artigo explicita três de suas principais proposições. Em primeiro lugar, a ideia segundo a qual a unidade da psicanálise reside no conceito de sujeito; em segundo lugar, a afirmação da inexistência de diferença entre a psicanálise com crianças e com adultos e, finalmente, em terceiro lugar, a consideração do desejo do analista como operador essencial no tratamento.

El artículo aborda la orientación psicoanalítica de Rosine y Robert Lefort y tiene por objetivo colocar en primer plano las contribuciones de estos dos autores en el desarrollo de nuevos horizontes prácticos para el psicoanálisis lacaniano. El artículo rescata así la originalidad de su obra, reflexionando sobre los principios esenciales que la orientan y que permiten la ampliación del discurso analítico a dominios hasta entonces juzgados refractarios a su tratamiento. Para ello, el artículo explicita tres de sus principales proposiciones. En primer lugar, la idea según la cual la unidad del psicoanálisis reside en el concepto de sujeto; en segundo lugar, la afirmación de la inexistencia de diferencia entre el psicoanálisis con niños y con adultos y, finalmente; en tercer lugar, la consideración del deseo del analista como operador esencial en el tratamiento.

The article deals with the psychoanalytic orientation of Rosine and Robert Lefort and aims to put in the foreground the contributions of these two authors in the development of new practical horizons for Lacanian psychoanalysis. The article thus rescues the originality of his work, reflecting on the essential principles that guide it and that allow the expansion of the analytical discourse to domains previously judged refractory to its treatment. To do so, the article explains three of its main propositions. In the first place, the idea that the unity of psychoanalysis lies in the concept of subject; secondly, the affirmation of the non-existence of difference between psychoanalysis with children and with adults and, finally, third, the consideration of the analyst's desire as an essential operator in the treatment.

Application of bone-support guide by three-dimensional printing technique in maxillary LeFortⅠosteotomy / 华西口腔医学杂志

OBJECTIVE@#This study aimed to investigate the application of an osteotomy template and a repositioning template manufactured by three-dimensional (3D) printing technique in maxillary LeFortⅠosteotomy.@*METHODS@#The patient group consisted of eight patients with maxillary hypoplasia who underwent LeFortⅠosteotomy. The mean age at the time of surgery was 25.6 years old. All patients were scanned using cone beam computed tomography (CBCT) to create a 3D model of the maxillary. The osteotomy and repositioning templates of the LeFortⅠosteotomy were manufactured by 3D printing technique. All bones were cut by the same doctor with extensive orthognathic surgery experience. One part of the template guided the osteotomy, and the other repositioned the maxilla during operation. Postoperative CBCT scan was performed, and the virtual plan was compared with the postoperative surgical result using an image fusion of the CBCT dataset by analyzing measurements between six landmarks relative to three reference planes. Statistical analysis was performed, and accuracy was reported using SPSS 16.0 software package.@*RESULTS@#Primary healing of incisions was observed in all patients, and no serious complications were observed. The maximum mean values were 1.35 mm, and the displacement error was UL6 to the coronal plane. The maximum standard deviation was 0.85, and the maximum standard error was 0.30, which was acceptable by clinical standards.@*CONCLUSIONS@#The application of osteotomy and repositioning templates manufactured by 3D printing technique in maxillary LeFortⅠosteotomy was safe and can enable doctors to complete a surgery accurately.

Giant Cell Granuloma of the Maxilla: A Rare Case Report.

Giant cell granuloma (GCG) is an uncommon bony lesion in the head and neck region, most commonly affecting the maxilla and mandible and has a female predilection. The clinical behaviour of central GCG ranges from a slowly growing asymptomatic swelling to an aggressive lesion. The clinical, radiological, histological features and management of an aggressive GCG of maxilla in a five-month-old male child are described and discussed here. The emphasis lies that surgery is the traditional and still the most accepted treatment for GCG. Le Fort I osteotomy has been advocated as one of the access osteotomy for the surgical management of aggressive and extensive GCG involving the maxilla.

The forensic application of Lefort aqua regia digestion method detecting diatom in rabbits′s organs( / 中国法医学杂志

Objective The forensic application of Lefort aqua regia digestion method detecting diatom in rabbits’s organs. Methods Using the Lefort aqua regia digestion-membrane ifltrition-SEM observation method and the traditional acid digestion-centrifugation-light microscopy observation method to detect diatom of drowning or postmortem immersion rabbits’s organs(lung,liver,kidney), and make statistical analysis of diatom number, consuming time, digestive capability and ifne structure of diatoms. Results The diatom number of Lefort aqua regia digestion method was superior to conventional acid digestion method, with the difference being statistically signiifcant (P0.05), and have a better observation effect. Conclusion The Lefort aqua regia digestion method for diatom extraction was helpful for diatom identiifcation., and useful in drowning test by conventional and economicly.

Bone and Soft Tissue Changes after Two-Jaw Surgery in Cleft Patients

BACKGROUND: Orthognathic surgery is required in 25% to 35% of patients with a cleft lip and palate, for whom functional recovery and aesthetic improvement after surgery are important. The aim of this study was to examine maxillary and mandibular changes, along with concomitant soft tissue changes, in cleft patients who underwent LeFort I osteotomy and sagittal split ramus osteotomy (two-jaw surgery). METHODS: Twenty-eight cleft patients who underwent two-jaw surgery between August 2008 and November 2013 were included. Cephalometric analysis was conducted before and after surgery. Preoperative and postoperative measurements of the bone and soft tissue were compared. RESULTS: The mean horizontal advancement of the maxilla (point A) was 6.12 mm, while that of the mandible (point B) was -5.19 mm. The mean point A-nasion-point B angle was -4.1degrees before surgery, and increased to 2.5degrees after surgery. The mean nasolabial angle was 72.7degrees before surgery, and increased to 88.7degrees after surgery. The mean minimal distance between Rickett's E-line and the upper lip was 6.52 mm before surgery and 1.81 mm after surgery. The ratio of soft tissue change to bone change was 0.55 between point A and point A' and 0.93 between point B and point B'. CONCLUSIONS: Patients with cleft lip and palate who underwent two-jaw surgery showed optimal soft tissue changes. The position of the soft tissue (point A') was shifted by a distance equal to 55% of the change in the maxillary bone. Therefore, bone surgery without soft tissue correction can achieve good aesthetic results.

Role of Le fort I Osteotomy in orthosurgical management of maxillary deformities in north Indian population.

Background: Le Fort I osteotomy is one of the most commonly performed procedure, either alone or in conjunction with other orthognathic procedures for maxillary deformities. Objective: The present prospective study pertains to definite diagnosis, orthosurgical planning with cephalometric predictions of dento-osseus deformities of maxilla and their correction by LeFort I osteotomy . Material and Methods: Fourteen patients with skeletal deformity along with malocclusion which was too severe to be corrected orthodontically alone were selected. Parameters were selected on the basis of clinical findings, cephalometrically hard and soft tissue landmarks [COGS (Burstone and Legan) and Steiners analysis]. Parameters were observed and compared preoperatively prediction values, postoperatively and on follow-up. Results: There were obvious improvement in various linear and angular readings of hard and soft tissues.In linear measurements,NANS  HP decreased from 57.62 ± 3.3 to 52.4 ± 2.9; ANS-Gn  HP decreased from 75.8 ± 8.1 to 69.3 ± 6.1; NA || HP reduced by approximately 5mm; N-Pg || HP decreased from -12.07 ± 9.6 to -3.78 ± 8.8 and PNS-N  HP decreased from 55.28 ± 5.08 to 58.07 ± 4.4. On analysis of angular hard tissue measurements, N-A-Pg angle decreased from 5.14 ± 5.75 to 4.17 ± 2.73 (superior repositioning of maxilla) and increased from 3.0 ± 1.4 to 4.5 ± 0.7 (inferior repositioning of maxilla);MP-HP angle, Ar-Go-Gn angle decreased following superior repositioning and increased following inferior repositioning of maxilla and SNA angle decreased from mean 80.8 to 79.5. Conclusion: LeFort I osteotomy is really a workhouse of orthognathic surgery in which maxilla can be mobilized in vertical and saggital planes to correct various dento-osseous deformities.

Osteosyntheses of lefort-I fracture.

In mid-face the maxilla represents the bridge between the cranial base superiorly and the dental occlusal plane inferiorly. Its valuable relation with the oral cavity, nasal cavity, and orbits and the multitude of structures contained within and adjacent to it make the maxilla a functionally and cosmetically precise structure. Fracture of these facial bones is potentially life-threatening as well as disfiguring. In time surgical intervention of these fractures provides the best chance to correct deformity and prevent unfavourable sequelae.

Bony Stability and Soft Tissue Changes after Orthognathic Surgery on Patients with Cleft

PURPOSE: The objective of this retrospective study was to assess the skeletal stability after orthognathic surgery for patients with cleft lip and palate. The soft tissue changes in relation to the skeletal movement were also evaluated. METHODS: Thirty one patients with cleft received orthognathic surgery by one surgeon at the Craniofacial Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan. Osseous and soft tissue landmarks were localized on lateral cephalograms taken at preoperative (T0), postoperative (T1), and after completion of orthodontic treatment (T2) stages. Surgical movement (T0-T1) and relapse (T1-T2) were measured and compared. RESULTS: Mean anteroposterior horizontal advancement of maxilla at point A was 5.5 mm, and the mean horizontal relapse was 0.5 mm (9.1%). The degree of horizontal relapse was found to be correlated to the extent of maxillary advancement. Mean vertical lengthening of maxilla at point A was 3.2 mm, and the mean vertical relapse was 0.6 mm (18.8%). All cases had maxillary clockwise rotation with a mean of 4.4 degrees. The ratio for horizontal advancement of nasal tip/anterior nasal spine was 0.54/1, and the ratio of A' point/A point was 0.68/1 and 0.69/1 for the upper vermilion/upper incisor tip. CONCLUSION: Satisfactory skeletal stability with an acceptable relapse rate was obtained from this study. High soft tissue to skeletal tissue ratios were obtained. Two-jaw surgery, clockwise rotation, rigid fixation, and alar cinch suture appeared to be the contributing factors for favorable results.

Bony Stability and Soft Tissue Changes after Orthognathic Surgery on Patients with Cleft

PURPOSE: The objective of this retrospective study was to assess the skeletal stability after orthognathic surgery for patients with cleft lip and palate. The soft tissue changes in relation to the skeletal movement were also evaluated. METHODS: Thirty one patients with cleft received orthognathic surgery by one surgeon at the Craniofacial Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan. Osseous and soft tissue landmarks were localized on lateral cephalograms taken at preoperative (T0), postoperative (T1), and after completion of orthodontic treatment (T2) stages. Surgical movement (T0-T1) and relapse (T1-T2) were measured and compared. RESULTS: Mean anteroposterior horizontal advancement of maxilla at point A was 5.5 mm, and the mean horizontal relapse was 0.5 mm (9.1%). The degree of horizontal relapse was found to be correlated to the extent of maxillary advancement. Mean vertical lengthening of maxilla at point A was 3.2 mm, and the mean vertical relapse was 0.6 mm (18.8%). All cases had maxillary clockwise rotation with a mean of 4.4 degrees. The ratio for horizontal advancement of nasal tip/anterior nasal spine was 0.54/1, and the ratio of A' point/A point was 0.68/1 and 0.69/1 for the upper vermilion/upper incisor tip. CONCLUSION: Satisfactory skeletal stability with an acceptable relapse rate was obtained from this study. High soft tissue to skeletal tissue ratios were obtained. Two-jaw surgery, clockwise rotation, rigid fixation, and alar cinch suture appeared to be the contributing factors for favorable results.

LeFort osteotomy used to enucleate a major dentigerous cyst / Osteotomía LeFort I utilizada para enuclear un gran quiste dentígero

LeFort I Osteotomy is a surgical technique frequently used for dentofacial deformities treatment. A few cases report show this technique for pathology treatment; LeFort I approach show many advantages as good visibility, good surgical control and very little postsurgical complications. In this case report, the authors present a great dentigerous cyst in premaxillae area related to supernumerary tooth. Almost three year treatment with one year of decompression, enucleation with LeFort I approach with modified sequence and one year of post operatory control showing success and predictability of technique.

La osteotomía LeFort I es una técnica quirúrgica frecuentemente utilizada para el tratamiento de deformidades dentofaciales. Pocos casos han mostrado su uso para el tratamiento de patologías; el acceso con osteomotias LeFort I muestra muchas ventajas como la buena visibilidad, buen control de la cirugía y pocas complicaciones postquirúrgicas. En este reporte de caso, los autores presentan un quiste dentígero de grandes proporciones en el área de la premaxila asociada a un diente supranumerario. Casi tres años de tratamiento con un año de descompresión, enucleación con acceso de LeFort I con una secuencia modificada y un año de control postquirúrgico muestran éxito y predictibilidad de la técnica.

Reposición maxilar y reconstrucción con injerto de cresta lliaca: parte 1: indicaciones y técnica quirúrgica / Maxillary repositioning and reconstruction with lliac crest graft: part 1: indications and surgical technique

Las técnicas de implantología actuales, no se limitan a evaluar la instalación de implantes y la rehabilitación protésica, sino que deben abocarse a resolver los problemas integrales de nuestros pacientes. De esta forma, devolver armonía facial perdida debe ser un criterio trascendente en la elección de los tratamientos. Con este principio, la estética se establece como un punto de inicio de nuestras terapias, lo cual lleva obligatoriamente a interrelacionarla con la función del sistema estomatognático. Este artículo tiene como objetivo discutir algunos conceptos asociados a la reconstrucción de maxilares atróficos y establecer su relación con fenómenos de deficiencias dentofaciales. Desarrollamos una revisión de aspectos que consideramos relevantes a la hora de escoger determinados tratamientos y presentamos uno de nuestros casos para ejemplificarlo.

Despite solve the implant installation and prosthesis rehabilitation the actual implant are also used to solve other disorders. This way, restore the facial symmetry lost has to be transcendent criteria when choosing a treatment. With this principle, aesthetic becomes a major point in our therapy, correlating it with the stomatognathic system function. The meaning of the present article is discuss some concepts associated with the reconstruction of the atrophic maxillas and established its relation with dentofacial deformities. It was performed a literature review of some points that we consider relevant when choosing a treatment planning and showing one of ours clinical case to exemplify.

Maxillary Sinus Mucocele as a Late Complication in a Patient Underwent Lefort I Procedure

PURPOSE: The authors report unusual one case of a patient presenting with maxillary sinus mucocele who had underwent Lefort I procedure 7 years ago. METHODS: Case report and literature review RESULTS: A 25 year old man came to us with fullness, pain and nasal obstruction on his left cheek area. He had a history of multiple operations due to cleft lip and palate since birth. Two jaw surgery was performed for correcting class III malocclusion 7 years ago. Computed tomography showed haziness, and fluid filled cystic mass on left maxillary sinus. Nasoendoscopy revealed the bulging of inferior turbinate and mucosa coincided in medial wall of maxillary sinus. Antrostomy with Caldwell-Luc approach was performed. Mucin contaning brownish exudate was leaked out. Severe inflammation of maxillary inner wall and exposure of 2 screws fixed previously were noticed. The curettage and marsupialization were accomplished. The symptoms of patient were improved after that procedure. CONCLUSION: Maxillary sinus mucocele is related with Lefort I procedure and it may occur even long after that procedure.

Stability of maxillary position after lefort i osteotomy using biodegradable plates and screws

INTRODUCTION: In orthognathic surgery, internal fixation has been usually done with titanium plates and screws. Recently, Biodegradable plates and screws have been frequently used but the reports of long term results of postoperative stability are rare, especially after maxillary reposition in orthognathic surgery. OBJECTIVE: In order to clarify the clinical utility of self-reinforced bioresorbable poly-70L / 30DL-Lactide miniplates & screws in maxillary fixation after LeFort I osteotomy, this study examined the postsurgical changes in maxilla and complications of biodegradable plates and screws. STUDY DESIGN: Nineteen patients who had undergone maxillary internal fixation using biodegradable plates and screws were evaluated radiographically and clinically. A comparison study of the changes in maxilla position after surgery in all 19 patients was performed with 1-week, 1-month, 3-months, 6-months and/or 1-year postoperative lateral cephalograms by tracing. Complication of the biodegradable plates and screws was evaluated by follow-up roentgenograms and clinical observation. And one-way ANOVA test was used for statistical analysis. RESULTS: The position of the maxillary bone was stable after surgery and was not changed significantly from 1 week to 1 year after operation. And we could not find any complication of biodegradable plates and screws. CONCLUSIONS: Internal fixation of the maxilla after LeFort I osteotomy using self-reinforced biodegradable plates and screws is a reliable method for maintaining postoperative position of the maxilla after LeFort I osteotomy.

Damage to an Endotracheal Tube during Lefort I Osteotomy: A case report / 대한마취과학회지

In maxillofacial surgery endotracheal tube provides patent airway and prevents patient from aspirating the blood. But serious complications such as tube obstruction or injury have been reported. In this case, endotracheal tube injury by surgical saw during Lefort I osteotomy occurred. We could not exchange the defective tube for a good one using laryngoscope or fiberoptic bronchoscope due to edema and blood in nostril and oral cavity. We didn't have any tube exchanger available too. Therefore, to provide patent and safe airway, we packed gauze around the lacerated part of tube, provided positive end expiratory pressure ventilation and increased oxygen flow. After anesthesia, the damaged tube was safely removed and there were no respiratory complications.

The reconstruction of posttraumatic craniofacial deformity using modified lefort II and III osteotomy and autogenous iliac bone graft

Application of LeFort I osteotomy in the treatment of old maxillary fracture / 实用口腔医学杂志

Objective:To study the effects of LeFort I osteotomy in the treatment of old maxillary fracture.Methods:30 patients with old maxillary fracture were treated with LeFort I osteotomy,the rehabilitation of occluding relation and masticatory function were observed after operation.Results:28 patients had well-pleasing occluding relation and masticatory function; 2 patients dissatisfied with their masticatory function, because of unbalance of nerve-muscle after their occlusal plane were rebuilt.Conclusion:LeFort I osteotomy can be a method in the treatment of old maxillary fracture.

A Study On The Postoperative Stability Of Lefort I Osteotomy In The Two-Jaw Surgery Of The Skeletal Class Iii Malocclusion Patients

PURPOSE: The purpose of this study was to evaluate the postoperative stability of LeFort I osteotomy in two-jaw surgery of class III malocclusion and to help the establishment of treatment planning in patients with a skeletal class III malocclusion future. MATERIALS AND METHODS: The lateral cephalograms of 14 patients who had been underwent two-jaw surgery via one-piece osteotomy were traced and the landmarks were identified. Repeated tracings and construction of reference planes were Comparisons were made from the immediate postoperative to late postoperative results of each landmarks on the horizontal and vertical directions. CONCLUSIONS: 1. The horizontal changes of landmark ANS, point A, PNS and Mx6Rt between immediate postoperative to late postoperative were statistically insignificant(p>0.05). 2. The vertical changes of landmark ANS, point A, PNS, Mx6Cr and Mx6Rt between immediate postoperative to late postoperative data were statistically insignificant(p>0.05). 3. The horizontal change of landmark Mx6Cr between immediate postoperative to late postoperative data was statistically significant(p<0.05). 4. Results showed that it was stable that one-piece LeFort I osteotomy in two-jaw surgery of skeletal class III malocclusion.