Evaluation of Alveolar Bone Quality: Correlation Between Histomorphometric Analysis and Lekholm and Zarb Classification.

OBJECTIVES: This study evaluated the bone quality of the maxilla and mandible by using the classification proposed by Lekholm and Zarb (L & Z) and histomorphometry. METHODS: Sixty edentulous areas were evaluated. The classification by L & Z was obtained through the evaluation of periapical and panoramic radiographs associated with the surgeon's tactile perception during milling and implant installation. Before implant installation, bone biopsies of standardized sizes were performed for histological evaluation. RESULTS: Type III bone quality was more frequent in the posterior (73.33%) and anterior (73.33%) maxilla, whereas type II bone quality was more frequent in the posterior (53.33%) and anterior (60.00%) mandible. Through histometry, statistical difference was observed for the amount of bone tissue of the posterior region of the maxilla in relation to the anterior and posterior regions of the mandible (P ≤ 0.043). However, there was no difference in osteocyte counts between alveolar regions (P = 0.2946). In the female gender, the age showed a low positive correlation with the L & Z classification (rho = 0.398; P = 0.006) and in the male gender, a moderate negative correlation was observed (rho = -0.650, P = 0.016). CONCLUSIONS: Both methods detected differences in the bone quality of the alveolar regions of the maxilla/mandible and that the classification by L & Z is a reliable method, since it was consistent with histomorphometry, considered the "gold standard" method for the evaluation of bone quality and greater bone density was observed in older men.

Management of Complications Related to Removal of the Buccal Fat Pad.

ABSTRACT: Removal of the buccal fat pad (BFP) is an important topic of discussion in the literature. Several studies have reported improvements in facial esthetics as a result of this technique. The BFP is close to vital structures, such as the facial nerve, parotid duct, and vessels. Injuries related to these structures may occur during the surgical procedure. This manuscript aimed to report and discuss 2 clinical cases of the complications after removal of the BFP. Besides the case presentation, a comprehensive review of the literature was also provided. The reported cases were 2 patients aged 31 and 38 years who were attended by the oral and maxillofacial surgery teams after a complication in the BFP surgery. The first case involved swelling due to Stensen's duct injury, and the second involved uncontrolled bleeding from the internal maxillary artery. Removal of the BFP must have precise indications. Complications may occur during or after surgery; hence, anatomical knowledge is fundamental to appropriate patient management.

Early Pediatric Multiple Facial Fractures Treatment With Resorbable Fixation.

ABSTRACT: The facial skeleton in pediatric patients can undergo several changes during development, according to their growth zones and the traumas they suffer. Thus, some of these traumas can lead to multiple complications if not treated properly. Epidemiology can vary according to the social, cultural, and environmental aspects of each individual. Therefore, each case must be treated individually, and it is important to consider age-specific aspects, such as the high osteogenic potential, which leads to faster bone healing. The use of resorbable fixation materials in facial fractures of pediatric patients is widespread, with good acceptance and great advantages over conventional titanium materials, mainly for the elimination of a second surgery to remove the materials. The present study aims to report a series of clinical cases of infants, who suffered trauma and evolved with fractures in the facial bones. Surgical treatment was instituted to reduce and fix fractures, using the resorbable system. Patients are followed up with periodic outpatient follow-up visits and have a good case evolution.

Postoperative Complications Associated With Different Fixation Methods of Isolated Mandibular Angle Fractures.

The objective of this study was to review the medical records of patients with a history of mandibular angle fracture who were attended at the Service of Oral and Maxillofacial Surgery and Traumatology of FOAr/UNESP in the last 5 years. The data collected were subjected to chi-squared test (significance level of 5%). The authors reviewed 19 medical records. The main cause was physical aggression (58.00%), but with no statistical difference in relation to the other etiologies (P > 0.05). Regarding the type of fixation, one 2.0-mm system plate associated with one 2.4-mm system plate and the fixation using only two 2.0-mm system plates were used in 7 patients each. The fixation method with a monocortical plate at the upper border was used in 5 patients. However, there was no statistically significant difference in the frequency of complications among the 3 fixation methods used (P > 0.05). In 52.64% of the patients, the third molar was removed intraoperatively. Despite this, there was no statistically significant difference in the frequency of complications when the third molar was in the fracture line or when it was removed postoperatively (P > 0.05). The complications observed were dehiscence associated with pain (44.44%), trismus (22.22%), infection (22.22%), and presence of bone spicules (11.11%). However, no statistical differences were observed between the frequency of different types of complications (P = 0.779). In the sample studied, there were no differences in the frequency of complications among the fixation methods applied.

Finite element analysis of low-profile reconstruction plates for atrophic mandibles: a comparison of novel 3D grid and conventional plate designs.

OBJECTIVES: This study aimed to compare the reconstruction with type 2.4 and three-dimensional (3D) grid plates relating the areas of weakness to anatomical regions of force incidence in atrophic mandibles with and without segmentation using finite element analysis (FEA). MATERIALS AND METHODS: Strength and force quality in the mandible were also determined. The atrophic mandible models with and without segmentation were divided into four groups, and the behavior of each plate was analyzed using finite element analysis. In the atrophic mandible without segmentation using the type 2.4 reconstruction plate, the highest stress concentration in the plate was observed in the posterior region of the mandibular body and in the grid type 3D reconstruction plate was observed in the mandibular angle. RESULTS: In the segmented atrophic mandible with the 2.4 reconstruction plate, higher stress concentration was observed in the mandibular segment defect. Analysis of the 3D grid-like reconstruction plate revealed that the geometry of the plate conferred greater stiffness to the assembly, as the most significant stress concentration was observed at the mandibular angle. CONCLUSION: The width of the plate design may influence the strength, not the thickness.

Atypical dento-alveolar fracture fixed with screws: a technical note.

Dento-alveolar process fracture is an important and common event in the dental office practice usually managed under the well-established protocols, but sometimes this kind of lesion is evaluated in the hospital emergency rooms without attention to the dental injuries. In this type of trauma, the time between the injury and the definitive resolution is essential for the treatment success, usually 1 h in cases of dento-alveolar fractures (tooth and alveolar bone). This paper describes the management of a patient with unusual dento-alveolar fracture caused by gunshot and treated using screw fixation.

Ossifying fibroma in the maxilla and orbital floor: report of an uncommon case.

Benign fibro-osseous lesions occur when normal bone is replaced by cellular fibrous connective tissue and mineralized structures. One rare type of these lesions is the ossifying fibroma (OF). The aim of this study is to report an unusual case of OF in a 57-year-old female. Physical examination showed facial asymmetry without any tenderness, fluctuation, ocular pain, or ophthalmoplegia. Imaging exams revealed a solid mass involving the left maxilla and orbital floor. Surgical resection was performed without any complications or sequelae, and the histopathological results confirmed OF. Although recurrence is rare in this condition, the patient remains under follow-up.

Evaluation of immediate bone-cell viability and of drill wear after implant osteotomies: immunohistochemistry and scanning electron microscopy analysis.

PURPOSE: This study sought to evaluate the effect of repeated implant drilling on the immediate bone-cell viability, and to evaluate drill wear by scanning electron microscopy. MATERIALS AND METHODS: The tibiae of 10 rabbits were used, divided into 5 groups (G): G1 corresponded to new drills, and G2, G3, G4, and G5 corresponded to drills used 10, 20, 30, and 40 times, respectively. The animals received 10 sequential osteotomies in each tibia. The animals were euthanized immediately after the osteotomies by perfusion with 4% formaldehyde. Samples then underwent immunohistochemistry processing for ordinal qualitative analysis of osteoprotegerin (OPG), the RANK ligant (RANKL; a tumor-related necrosis factor receptor family), and osteocalcin protein immunolabels, as detected by the immunoperoxidase method and revealed with 3,3-diaminobenzidine. Drill wear and plastic deformation were analyzed by scanning electron microscopy (SEM). RESULTS: The proteins were expressed in osteocytes of the superior bone cortical during the 40 drillings. However, in G4 and G5, a discrete increase in the expression of RANKL was observed, when compared with OPG; this increase was statistically significant in G5 (P = .016). The SEM analysis revealed major plastic deformation and drill wear in G4 and G5. CONCLUSION: Based on the present methodology, it may be concluded that cell viability is preserved if a less traumatic surgical protocol is used. However, the repeated use of drills alters the protein balance as of the thirtieth perforation.

Parestesia após a exodôntica do terceiro molar: protocolo proposto / Paresthesia after third molar surgery: proposed protocol

Objetivo: Determinar a prevalência de parestesia do nervo alveolar inferior em exodontias dos terceiros molares mandibulares realizadas por estudantes de Odontologia. Material e métodos: O presente estudo retrospectivo incluiu os prontuários de 226 pacientes submetidos à exodontia dos terceiros molares mandibulares durante o período de julho de 2015 a agosto de 2017 por estudantes de Odontologia da Liga Acadêmica de Cirurgia da Universidade Federal de Campina Grande, Campus-Patos, Paraíba, Brasil. Resultados: Foram removidos 238 terceiros molares mandibulares de pacientes com faixa etária entre 16 a 42 anos, sendo a maioria dos pacientes do gênero feminino (71,68%). Nove dos pacientes (3,9%) relataram algum grau de comprometimento no território de inervação do nervo alveolar inferior com remissão total do sintoma no período de 3,7 meses. A prevalência da parestesia em relação ao número de terceiros molares inferiores extraídos foi de 1:25. Conclusão: A prevalência de parestesia decorrente da exodontia de terceiros molares mandibulares realizadas por estudantes de Odontologia é de 3,9%... (AU)

Objective: To define the prevalence of inferior alveolar nerve damage in mandibular third molar extractions performed by dentistry students. Materials and methods: The present retrospective study included the medical records of 226 patients submitted to mandibular third molar extraction during the period from July 2015 to August 2017 by students of Dentistry of the Academic League of Surgery of the Federal University of Campina Grande, Campus- Patos, Paraíba, Brazil. Results: 238 mandibular third molars were extracted from patients aged 16 to 42 years, with the majority of patients being females (71.68%). Nine of the patients (3.9%) reported some degree of involvement in the territory of innervation of the inferior alveolar nerve with total suspension of the symptom in the period of 3.7 months. The prevalence of damage in relation to the number of lower third molars extracted was 1:25. Conclusion: The prevalence of damage resulting from mandibular third molar extraction performed by dentistry students is 3.9%... (AU)

Maxillary Osteomyelitis by Actinomyces in a Child / Osteomielitis Maxilar por Actinomyces en un Niño

ABSTRACT: Actinomycosis is a bacterial infection caused by Actinomyces species, which usually affect the soft tissues of the cervicofacial region of adult males. Clinically, it's characterized by a slow-growing indurated mass, especially in the submandibular area. However, in a few cases, the jaws bones can be affected developing osteomyelitis characteristics. The aim of this paper is to report a rare clinical case of Actinomycotic Osteomyelitis affecting the maxilla of a child, involving the maxillary sinus, orbital and zygomatic areas that was treated by the association of antibiotic therapy and surgical debridement. The patient's 2 years follow-up was uneventful and no signs of the lesion recurrence.

RESUMEN: La actinomicosis es una infección bacteriana causada por la especie Actinomyces, que generalmente afecta los tejidos blandos de la región cervicofacial de los hombres adultos. Clínicamente, se caracteriza por una masa endurecida de crecimiento lento, especialmente en la zona submandibular. Sin embargo, en algunos casos, los huesos de las mandíbulas pueden ser afectados desarrollando características de osteomielitis. El objetivo de este trabajo es reportar un caso clínico poco frecuente de osteomielitis actinomicótica que afecta el maxilar de un niño, envolviendo el área del seno maxilar, y zonas orbitales y cigomáticas que fueron tratadas con la asociación de terapia con antibióticos y desbridamiento quirúrgico. El seguimiento del paciente por 2 años ocurrió sin incidentes y sin signos de recidiva de las lesiones.

Marginal resection for treatment of mandibular osteomyelitis associated with osteopetrosis: case report.

Osteopetrosis (OP) is a rare hereditary disorder characterized by a dysfunction of the osteoclasts that impairs bone resorption, which together with the normal osteoblastic activity forms intense bone sclerosis with reduction of marrow. A common complication that arises, most frequently, as a result of tooth extraction is mandibular osteomyelitis. There is no consensus on the literature about the treatment of this infection in an osteopetrotic patient, therefore, the purpose of this paper is to report a case of marginal resection for treatment of mandibular osteomyelitis in an osteopetrotic patient and discuss relevant features of this procedure.

Tracheostomy-dependent child with temporomandibular ankylosis and severe micrognathia treated by piezosurgery and distraction osteogenesis: case report.

Ankylosis of the temporomandibular joint in children is one the most difficult and complex conditions managed by oral and maxillofacial surgeons, and often leads to some facial deformity. Distraction osteogenesis of the mandible provides an excellent treatment for mandibular airway obstruction in children who do not respond to conservative measures, and allows for early removal of the tracheostomy. We report the case of a 1-year-old boy with severe micrognathia and temporomandibular ankylosis who was dependent on a tracheostomy; he was treated with piezosurgery and mandibular advancement by distraction osteogenesis.

Enxerto ósseo mandibular, complicações associadas às áreas doadoras e receptoras, e sobrevivência de implantes dentários: um estudo retrospectivo / Mandibular bone graft, complications associated the donor and recipient areas and survival dental implants: a retrospective study

Introdução: Enxertos ósseos retirados da sínfise ou do ramo mandibular podem ser empregados para reconstrução de defeitos localizados dos maxilares, para permitir a instalação adequada de implantes dentários. Objetivo: Este estudo tem por objetivo avaliar a ocorrência de complicações associadas com as áreas doadoras e receptoras de enxerto ósseo mandibular, e a sobrevivência de implantes dentários instalados nesses sítios reconstruídos. Material e método: Avaliaram-se 730 prontuários de pacientes submetidos a tratamento com implantes dentários. Desse universo, 72 pacientes, de ambos os gêneros, foram submetidos à reconstrução óssea com enxerto retirado da sínfise ou do ramo mandibular. Resultado: Foram observadas 13 complicações e não houve diferença estatística significante quanto à ocorrência de complicações das áreas doadoras e receptoras, e da sobrevivência de implantes dentários instalados nos sítios reconstruídos com enxerto ósseo mandibular. Conclusão: Os enxertos ósseos mandibulares permitem a reconstrução de defeitos localizados dos maxilares e não são fatores de risco para a falha de implantes dentários.

Introduction: Grafts bone removed of the symphysis or mandibular ramus can be used for reconstruction located defect jaws to allow adequate installation of dental implants. Objective: This study aims evaluate the occurrence of complications associated with donor and receptor sites of mandibular bone graft and survival of dental implants these reconstructed sites. Material and method: Evaluated seven hundred thirty records of patients submitted treatment with dental implants. This universe, seventy-two patients of both genders, was submitted bone reconstruction with graft removed from the symphysis or the mandibular ramus. Result: Thirteen complications were observed and there was no statistically significant difference in the occurrence of complications of donor and recipient areas and survival of dental implants installed in sites reconstruction with mandibular bone graft. Conclusion: The mandibular bone grafts allow the reconstruction of defects located in jaws and don't risk factors for failure of dental implants.

Avaliação do nível de conhecimento dos estudantes de Educação Física sobre a avulsão dentária / Assessment of the level of knowledge of Physical Education students on the tooth avulsion

Essa pesquisa objetivou avaliar o nível de conhecimento dos estudantes de Educação Física de uma instituição de ensino superior da cidade de Patos- PB sobre a avulsão dentária. Para isto foi elaborado e aplicado um questionário estruturado e padronizado com 81 estudantes do referido curso, através do qual 39% responderam corretamente o que seria a avulsão dentária; 91% nunca receberam informações sobre o atendimento ao paciente vítima desse tipo de trauma e 35% afirmaram que o procedimento de eleição, nesses casos, seria a restauração do dente. Com base nos resultados conclui-se que os estudantes de educação física necessitam de um conhecimento mais abrangente sobre os traumatismos dentários e, consequentemente, a avulsão dentária, tão comuns de ocorrer em atividades práticas desportivas.

This research aimed assess the level of knowledge of students of physical education from a university the Patos-PB city about tooth avulsion. For this has been developed and implemented a structured and standardized questionnaire about dental trauma with 81 students of that course, whereby 39% answered correctly what would be the tooth avulsion; 91% never received information about patient care victim of such trauma and 35% said that the election procedure in such cases would be the restoration of the tooth. Based on the results it is concluded that PE students require a more comprehensive understanding of the subject since the trauma and thus the tooth avulsion is common practice to occur in sports activities.

Dipirona versus paracetamol no controle da dor pós-operatória / Dipyrone versus acetaminophen in the control of postoperative pain

Introdução: A dor é definida como uma experiência desagradável, sendo o controle da dor pós-operatória um grande desafio na área da saúde. Objetivo: Comparar a eficácia da dipirona e do paracetamol no controle da dor pós-operatória após exodontia de terceiros molares inclusos. Material e Método: Foram selecionados 30 pacientes da Disciplina de Cirurgia da Faculdade de Odontologia de Araçatuba - UNESP, que necessitavam extrair os terceiros molares inclusos. Desses, 15 receberam dipirona (Grupo I) e outros 15 receberam paracetamol (Grupo II) no pós-operatório. Todos os pacientes foram tratados, no pré-operatório, uma hora antes do procedimento cirúrgico, com dexametasona 4 mg e amoxicilina 1 grama. A intensidade da dor foi avaliada pelos pacientes por meio de escala visual analógica, em um período pós-operatório de 48 horas, em intervalos de 6 horas. Os critérios de exclusão foram: presença de desordens sistêmicas, hipersensibilidade medicamentosa, gestação, lactação e contraindicações locais. Os escores obtidos foram submetidos ao teste de Mann-Whitney (α = 0,05) para comparação das intensidades de dor em intervalos de 6 horas, nas 24 horas iniciais, nas 24 horas finais e no período total de 48 horas. Resultado: Não houve diferença estatística entre os analgésicos estudados nos intervalos de 6 horas; entretanto, nas 24 horas finais e nas 48 horas totais de observação, o Grupo I apresentou valores médios menores, estatisticamente significantes, quando comparado ao Grupo II. Conclusão: A eficácia analgésica da dipirona foi superior à do paracetamol.

Introduction: The pain is defined as an unpleasant experience, and control of postoperative pain a great challenge in healthcare. Objective: To compare the efficacy of Dipyrone and acetaminophen in postoperative pain after third molar surgery. Material and Method: Thirty patients of the Discipline of Surgery of School of Dentistry of Araçatuba - UNESP, that needed to extract their third included molars, were selected. Among these, 15 received Dipyrone (group I) and the other received acetaminophen (group II) in the postoperative. All patients were treated pre-operatively with dexamethasone 4 mg and amoxycillin 1 g, one hour before surgery. Pain intensity was evaluated by a visual analogue scale by forty eight hours postoperative period and in intervals of six hours. The exclusion criteria were: presence of systemic disorders, drugs hypersensitivity, pregnant, lactic and local contraindications. The scores obtained were submitted to the Mann-Whitney test (p < 0,05) for comparison of the pain intensity in the 6 hours intervals, in the initial 24 hours, in the last 24 hours and in the total period of 48 hours. Result: There was no statistical difference among the analgesics in the 6 hours intervals, however, in the last 24 hours and in the total period of 48 hours, the group I presented smaller medium values, significant statistically, when compared to group II. Conclusion: The analgesic efficacy of dipyrone was superior to paracetamol.

Prevalência de alterações sistêmicas em pacientes atendidos na disciplina de Cirurgia e Traumatologia Bucomaxilofacial do curso de Odontologia da UNIARA / Prevalence of systemic diseases in patients evaluated in the discipline of Oral and Maxillo Facial Surgery of Araraquara University Center - UNIARA

Introdução: A avaliação pré-operatória é de fundamental importância para a prevenção de intercorrências transoperatórias e de complicações pós-operatórias. Objetivo: Identificar a prevalência de enfermidades e condições sistêmicas em pacientes submetidos a tratamento cirúrgico na área de Cirurgia e Traumatologia Bucomaxilofacial do Curso de Odontologia, do Centro Universitário de Araraquara - UNIARA, no período de 2004 a 2009. Material e método: Para o desenvolvimento deste trabalho, foi realizado um levantamento nos prontuários desses pacientes, sendo analisados os seguintes fatores: idade, gênero, presença de vícios, principais enfermidades e condições sistêmicas que afetam a população mundial. Os dados obtidos foram analisados quantitativamente e registrados em uma tabela. Resultado: No total de prontuários analisados (693), foram detectadas 340 respostas afirmativas (49,06%) a uma ou mais enfermidades. As doenças cardiovasculares foram as mais prevalentes (22,34%). Considerando-se a prevalência de doenças relacionadas à idade, a faixa etária de menos de 20 anos representou 16,32%; 20-29 anos, 43,06%; 30-39 anos, 45,16%; 40-44 anos, 48,64%; 45-49 anos, 56,25%; 50-54 anos, 58,33%; 55-59 anos, 57,74%; 60-64 anos, 70,37%; 65-69 anos, 66,66%; 70 anos ou mais, 68,75%. Conclusão: As doenças e alterações sistêmicas com maior prevalência foram doenças cardiovasculares, anemia, sinusite e diabetes. A frequência das respostas afirmativas a quadros sistêmicos foi idade-dependente e houve predominância do gênero feminino. Já o vício mais frequente foi o tabaco. Assim, pôde-se observar ser de fundamental importância a realização de avaliação pré-operatória da saúde dos pacientes que irão se submeter a tratamento odontológico/cirúrgico.

Introduction: pre-operative assessment is of fundamental importance for the prevention of transoperative and of postoperative complications. Objective: to identify the prevalence of diseases and systemic conditions in patients undergoing surgical treatment in the discipline of surgery and Traumatology of University Center of Araraquara, in the period of 2004 to 2009. Material and method: for the development of this study, a survey in medical records of patients was performed and the factors considered included: age, sex, presence of vices, and systemic conditions that affect the world?s population. The data obtained were analyzed quantitatively and recorded in atable. Result:  Considering all patient records analyzed (693), 340 affirmative responses were detected (49,06%) to one or more diseases. Cardiovascular diseases were the most prevalent (22,34%). Considering the prevalence of diseases related to age, the age of less than 20 years represented 16,32%; of 20-29 years, 43,06%; 30-39 years, 45,16%; 40-44 years, 48,64%; 45-49 years, 56,25%; 50-54 years, 58,33%; 55-59 years, 57,74%; 60-64 years, 70,37%; 65-69 years, 66,66%; and 70 years or more, 68,75%. Conclusion: diseases and systemic alterations with higher prevalence were cardiovascular diseases, anemia, sinusitis and diabetes. The frequency of affirmative answers to systemic conditions was age-dependent and there was a predominance of females. The tobacco addiction was the most frequent. Thus, it was found that the preoperative assessment of the health of patients who will undergo surgical dental treatment is of fundamental importance.

Tratamento cirúrgico de canino incluso em mento: relato de caso / Surgical treatment of an impacted canine in the menton: case report

Os caninos maxilares e mandibulares, quando estão em sua posição normal, são importantes dos pontos de vista estético e funcional. Estes são dentes frequentemente mal posicionados, porém a falha do irrompimento de canino mandibular é pouco comum, sendo mais frequente a inclusão de caninos maxilares. A transmigração - migraçãopré-eruptiva de um dente através da linha média - de caninos, por sua vez, é relatada na mandíbula com maior frequência do que na maxila. O gênero feminino é mais acometido que o masculino e o lado esquerdo é mais prevalente que o direito. Normalmente, os pacientes não apresentam sintomas; portanto, os dentes inclusos são descobertos em exames radiográficos para diagnosticar a demora da esfoliação do canino decíduo ou por qualquer outra finalidade. Devido a possíveis associações de caninos inclusos com lesões patológicas, infecção, lesão aos dentes vizinhos, dor, erupção ectópica e interferência com próteses, indica-se a remoção cirúrgica destes dentes. Este trabalho tem por objetivos escrever e discutir um caso clínico-cirúrgico de canino (43) incluso em mento.

The mandibular and maxillary canines when well positioned in the arch, are important functionally and aesthetically. Although these teeth are frequently malpositioned in the dental arch, their absence of eruption are not common, occuring more frequently with the maxillary canine than the mandibular canine. The canine transmigration is a well-known pre eruptive phenomenon in which the tooth goes thru the facial midline, occurring more frequently in the mandible than in maxila. Females are more susceptible than males and the right side more than the left one. Normally the patients do not show any symptoms, and this condition is observed during radiographic exams to diagnose the late exfoliation of the deciduous canine or for any other purpose. Due to the relationshipbetween impacted canines and pathologic lesions, infection, trauma to the adjacent teeth, pain, ectopic eruption and interference with prosthesis, it´s indicated the surgical extraction of these teeth. The goal of this article is to describe and discuss the surgical treatment of an impacted canine (43) in the chin.

Análise da fidelidade do traçado predictivo em pacientes submetidos à cirurgia ortognática em mandíbula / Assessment of the accuracy of cephalometric prediction tracings in patients subjected to orthognathic surgery in the mandible

OBJETIVO: a proposta desse trabalho foi analisar a fidelidade dos traçados predictivos realizados para cirurgias ortognáticas, por meio de análise cefalométrica do pré e pós-operatório de sete dias, em pacientes submetidos à correção de deformidade mandibular. MÉTODOS: foram utilizadas telerradiografias cefalométricas de perfil de 17 pacientes submetidos à cirurgia ortognática de mandíbula. Foram realizados traçados cefalométricos do pré e do pós-operatório de 7 dias com marcação dos pontos côndilo (Co), pogônio (Pog), goníaco (Go), mento (Me), ponto B (B) e incisivo (I). A análise foi baseada na diferença obtida pela sobreposição dos traçados pré-operatório, predictivo e pós-operatório. Os pontos foram projetados em um plano cartesiano para medição das suas distâncias em milímetros. Os dados obtidos foram submetidos à análise estatística por meio do teste t de Student pareado (± = 0,05). RESULTADOS: no eixo horizontal, foi observada diferença média, entre a mudança planejada e a obtida nos traçados cefalométricos pós-operatórios, estatisticamente significativa nos pontos Pog (p = 0,014) e I (p = 0,008). No eixo vertical, não verificou-se diferença estatística significativa para os pontos cefalométricos marcados (p > 0,05). CONCLUSÕES: o traçado predictivo contribuiu para a avaliação pré-operatória do paciente e, consequentemente, para a otimização do tratamento. Entretanto, ele não se mostrou totalmente fiel nos casos analisados, com leve subestimação das alterações esqueléticas horizontais. Essas alterações devem ser consideradas no planejamento e acompanhamento pós-operatório dos pacientes submetidos à cirurgia ortognática em mandíbula.

OBJECTIVE: The purpose of this study was to assess the accuracy of cephalometric prediction tracings-performed for orthognathic surgery-by means of the cephalometric analysis of preoperative and seven-day postoperative tracings, in patients subjected to correction of mandibular deformities. METHODS: The lateral cephalograms of 17 patients who had been submitted to mandibular orthognathic surgery, three years earlier, were used. Cephalometric tracings were performed in the preoperative and seven-day postoperative periods and the following landmarks were traced: condyle (Co), pogonion (Pog), gonial (Go), menton (Me), B (B) and incisor (I). The analysis was based on the difference obtained by superimposing preoperative, prediction and postoperative tracings. The landmarks were projected onto a Cartesian plane for measuring distances between points in millimeters. The data were statistically analyzed using the paired Student t test (a = 0.05). RESULTS: A statistically significant mean difference was observed between the planned change and the change effectively achieved in the postoperative cephalometric tracings for points Pog (p = 0.014) and I (p = 0.008) on the horizontal axis. No statistically significant difference was found for the aforementioned cephalometric points on the vertical axis (p > 0.05). CONCLUSIONS: Cephalometric prediction tracings contributed to the preoperative evaluation of the patients and consequently to treatment optimization. However, they was not entirely reliable in these cases due to a slight underestimation of horizontal skeletal changes. These changes should be considered in planning and postoperative follow-up of patients subjected to orthognathic surgery in the mandible.