Implications of anatomical variation of the sphenoid sinus for orthognathic surgery: a case report in cone beam computed tomography / Implicações da variação anatômica do seio esfenoidal para cirurgia ortognática: um relato de caso em tomografia computadorizada de feixe cônico

ABSTRACT The Sphenoid Sinus is considered the paranasal sinus with more variation to the degree of pneumatization. Thus, this work aimed report to the first case on the interference of this anatomical variation for orthognathic surgery. A 18- year-old woman, with isolated cleft palate repaired, was submitted to orthognathic surgery to correct the maxillomandibular skeletal discrepancy. The cone beam computed tomography (CBCT) exam performed for preoperative planning showed a great extension for the adjacent structures, with proximity to the posterior wall of the maxillary sinus and pterygomaxillary fissure bilaterally. The postoperative CBCT image evidenced the compromise of the sinus floor due to the factors related to the transoperative period. This case, along with literature review, highlighted the importance of identifying sphenoid sinus variation in CBCT exams prior to orthognathic surgery, in order to avoid serious complications for the patient, such as sinus infections; hemorrhages; mucocele formation or intracranial involvement.

RESUMO O Seio Esfenoidal é considerado o seio paranasal com maior variação quanto ao grau de pneumatização. Assim, este trabalho objetivou relatar o primeiro caso sobre a interferência dessa variação anatômica para a cirurgia ortognática. Mulher,18 anos, com fissura de palato isolada reparada, foi submetida à cirurgia ortognática para correção da discrepância esquelética maxilomandibular. O exame de tomografia computadorizada de feixe cônico (TCFC), realizado para planejamento pré-operatório, mostrou grande extensão para as estruturas adjacentes, e com proximidade da parede posterior do seio maxilar e fissura pterigomaxilar bilateralmente. A imagem de TCFC pós-operatória evidenciou o comprometimento do assoalho do seio devido aos fatores relacionados ao transoperatório. Este caso, juntamente com a revisão da literatura, destacou a importância de identificar a variação do seio esfenoidal nos exames de TCFC prévios à cirurgia ortognática, a fim de evitar complicações graves para o paciente, tais como sinusite, hemorragias, formação de mucoceles ou, até mesmo, envolvimento intracraniano.

Evaluation of the Nasopharyngeal Cannula Use After Orthognathic Surgery: Permeability of the Nasal Airways and Discomfort of the Patient With Cleft Lip and Palate.

It is believed that the use of the nasopharyngeal cannula can maintain the patent upper airway in the immediate post-operative period of orthognathic surgery. The present study is a randomized clinical trial with the objective of evaluating the difference in the use of the nasopharyngeal cannula in the post-operative period of orthognathic surgery with respect to permeability and discomfort. The sample was composed of 26 individuals with repaired cleft lip and palate randomly distributed in 2 groups with and without nasopharyngeal cannula. The evaluation was composed by Visual Analogue Scale (VAS), test with Altman mirror in 4 pre-operative periods, 6, 24, 30 hours after the operation. Rhinomanometry was also performed, a flow- pressure technique in 2 distinct moments, 6 and 24 hours after surgery. As a result, greater discomfort, greater obstruction as well as a reduction in the area of bilateral minimum nasal cross-section (ASTM) and increased resistance in the group with nasopharyngeal cannula are observed. In the intra-group comparison with the lowest ASTM values, the test group showed a significant difference between the first and the second moments (P = 0.001). It can be concluded that the nasopharyngeal cannula contributes to increase discomfort, worsens airway permeability by decreasing ASTM and increasing nasal resistance. Regarding the length of stay of the nasopharyngeal cannula, it can be said that from 6 hours onwards it does not contribute to the reduction of discomfort, airway permeability and assist in hemostasis.

Postoperative Orthognathic Surgery Edema Assessment With and Without Manual Lymphatic Drainage.

OBJECTIVE: To evaluate the effects of manual lymphatic drainage (MLD) on facial edema and pain in patients who underwent orthognathic surgery from patient and professional perspectives and clinical measures. METHODS: It is a randomized double-blind clinical trial, where 30 patients who underwent bimaxillary orthognathic surgery were divided into 2 groups (treatment and placebo). One group (treatment) received MLD from 2nd postoperative day, besides cryotherapy and postoperative medications. The other group (placebo) received cryotherapy, medications, and manual superficial sliding movements as placebo. For edema evaluation, facial measurements with tape and photographs were used. To evaluate patients' perception, visual analog scale for pain and edema was used. In statistical analysis, quantitative data were analyzed using Student t test for normally distributed variables and Mann-Whitney test for non-normal to find differences between groups; 5% significance level was adopted. RESULTS: No difference was found between groups in the amount of maximum developed edema (P = 0.290) nor on what day the edema peak occurred (P = 0.091). However, it was found that treatment group showed faster and greater regression of swelling compared with placebo (P < 0.001). Manual lymphatic drainage was not effective in relieving pain in these patients and nor in edema perception (P = 0.784 and P = 0.946, respectively). CONCLUSION: Manual lymphatic drainage was effective in reducing facial measurements in orthognathic surgery postoperatory. When considering patient's pain and swelling perception, no difference was found between groups.

Comparação da anatomia transversal de mandíbula de indivíduos classe III com e sem fissura labiopalatina por meio de tomografia de feixe cônico / Comparison of transverse dimension of class III mandible with and without cleft lip and palate using conical beam tomography

A relação entre a anatomia mandibular e a ocorrência de fratura indesejada de mandíbula na osteotomia sagital é alvo de estudos. A literatura mostra a existência de diferentes conformações anatômicas da mandíbula, porém não há estudos nessa área direcionados a indivíduos com fissura labiopalatina. Também não há na literatura estudos que mostrem as diferenças morfológicas da mandíbula relacionadas a secção transversal entre primeiro e segundo molar e sua relação com implicações na cirurgia ortognática. O objetivo do presente estudo foi avaliar a morfologia da região entre primeiro e segundo molar inferior e classificar a prevalência dos tipos mandibulares dentro de cada grupo. Foram realizadas análises e medições das reformatações das tomografias da região de molares, bilateralmente, de indivíduos Classe III, com fissura labiopalatina unilateral (Grupo FLP) submetidos à cirurgia ortognática para recuo mandibular no Hospital de Reabilitação de Anomalias Craniofaciais e de indivíduos Classe III, sem fissura (Grupo Controle) do banco de dados do Departamento de Cirurgia e Estomatologia da Faculdade de Odontologia de Bauru. Foram realizadas duas medidas lineares e uma medida angular. As hemimandíbulas foram classificadas segundo a profundidade da fossa mandibular em: Tipo a - 0 e 1mm; Tipo b - 1,1 e 2mm; Tipo c - 2,1 e 3mm; Tipo d - maior que 3,1mm. Foram analisadas 200 hemimandíbulas no Grupo FLP e 100 no Grupo Controle. Os resultados mostraram que não houve diferença entre os grupos quanto a classificação das mandíbulas segunda a profundidade da fossa, sendo o grupo b o mais prevalente, mas houve diferença em relação a angulação e a altura da mandíbula. Também foi notada uma relação entre a altura da mandíbula e a sua angulação em ambos os grupos. Assim, pode ser observada a grande variação morfológica dessa região, tanto para o grupo com fissura labiopalatina, quanto para o grupo controle. (AU)

The relationship between a mandibular anatomy and an occurrence of an undesirable jaw fracture in a sagittal osteotomy is the subject of the studies. The literature shows an existence of different anatomical conformations of the mandible, but there are no studies on the area directed to individuals with cleft lip and palate. There are not in the literature, studies that show a prevalence of mandibular types and the relation of these anatomical variations with orthognathic surgery implications. The objective of the present study was evaluate the morphology of the region between the first and second lower molars and analyze the prevalence of mandibular types within each sample group. Analyzes and measurements of the CT scans were performed bilaterally on Class III patients with unilateral cleft lip and palate (CLP Group) submitted to orthognathic surgery for mandibular retreatment at the Hospital for Rehabilitation of Craniofacial Anomalies and Class III individuals, without Fissure (Control Group) of the database of the Department of Stomatology of the Faculty of Dentistry of Bauru. Two linear measurements and one angular measurement were performed. The half of mandibles were classified according to the depth of the mandibular fossa in: Type a - 0 and 1mm; Type b - 1.1 and 2mm; Type c - 2.1 and 3 mm; Type d - greater than 3.1mm. Two hundred half of mandibles were analyzed in the CLP Group and 100 in the Control Group. The results showed that there was no difference between the groups regarding the classification of the mandibles according to the depth of the fossa, being group b the most prevalent, but there was difference in relation to the angulation and the height of the mandible. It was also noted a relationship between the height of the mandible and its angulation in both groups. Thus, the great anatomical variation of this region can be observed, both for the group with fissure and for the group without fissure. (AU)