Inflammatory Modifications in Paranasal Sinuses and Ostiomeatal Complex Anatomical Variations in Jet Aircraft Pilots: A Computed Tomography Study

Abstract Introduction Jet aircraft pilots are exposed to huge pressure variation during flight, which affect physiological functions as systems, such as the respiratory system. Objectives The objective of the present investigation was to evaluate inflammatory changes of paranasal sinuses of jet aircraft pilots before and after a jet aircraft training program, using multislice computed tomography (CT), in comparison with a group of nonairborne individuals with the same age, sex, and physical health conditions. A second objective of the present study was to assess the association between the ostiomeatal complex obstruction and its anatomical variations. Methods The study group consisted of 15 jet aircraft pilots participating in the training program. The control group consisted of 41 nonairborne young adults. The 15 fighter pilots were evaluated before initiating the training program and after their final approval for the presence of inflammatory paranasal sinus disease. The ostiomeatal complex anatomical variations and obstructions were analyzed in pilots after the training program. Results Jet aircraft pilots presented higher incidence of mucosal thickening in maxillary sinus and anterior ethmoid cells than controls. Prominent ethmoidal bulla showed significant association with obstruction of the osteomeatal complex. Conclusions Jet aircraft pilots present increased inflammatory disease when compared with nonairborne individuals. The presence of a prominent ethmoidal bulla is associated with ostiomeatal complex obstruction.

Assessment of the osteogenic effect after maxillary sinus floor elevation and simultaneous implantation with or without bone grafts by analyzing trabecular bone parameters: a retrospective study

Abstract Objective: The aim of this population-based retrospective study was to compare the osteogenic effect of newly formed bone after maxillary sinus floor elevation (MSFE) and simultaneous implantation with or without bone grafts by quantitatively analyzing trabecular bone parameters. Methodology: A total of 100 patients with missing posterior maxillary teeth who required MSFE and implantation were included in this study. Patients were divided into two groups: the non-graft group (n=50) and the graft group (n=50). Radiographic parameters were measured using cone beam computed tomography (CBCT), and the quality of newly formed bone was analyzed by assessing trabecular bone parameters using CTAn (CTAnalyzer, SkyScan, Antwerp, Belgium) software. Results: In the selected regions of interest, the non-graft group showed greater bone volume/total volume (BV/TV), bone surface/total volume (BS/TV), trabecular number (Tb. N), and trabecular thickness (Tb. Th) than the graft group (p<0.001). The non-graft group showed lower trabecular separation (Tb. Sp) than the graft group (p<0.001). The incidence of perforation and bleeding was higher in the graft group than in the non-graft group (p<0.001), but infection did not significantly differ between groups (p>0.05). Compared to the graft group, the non-graft group showed lower postoperative bone height, gained bone height and apical bone height (p<0.001). Conclusion: MSFE with and without bone grafts can significantly improve bone formation. In MSFE, the use of bone grafts hinders the formation of good quality bone, whereas the absence of bone grafts can generate good bone quality and limited bone mass.

Histomorphometric Comparison of Bio-Oss vs. Osteodens in Maxillary Sinus Floor Elevation Procedures / Comparación histomorfométrica de Bio-Oss frente a Osteodens en procedimientos de elevación del suelo del seno maxilar

Introduction: The loss of dental elements can lead to excessive bone loss in the posterior maxillary segments, which can limit the placement of dental implants in that area, the pneumatization of the maxillary sinus and the absence of dental elements to keep the bone active are some of the main causes. Among the wide range of available grafting materials, bovine hydroxyapatite has been extensively studied and has shown excellent clinical and histological results. Materials and methods: A total of 17 maxillary sinus floor elevations were performed (n = 8 Osteodens, n = 9 Bio-Oss). After a healing period of 6 to 8 months, a block of the grafted area was obtained using trephines and analyzed by histomorphometry. Results: The percentage of neoformed bone tissue was higher for Bio-Oss (39.0% ± 11.1) compared to Osteodens (33.4% ± 8.3), while the remaining graft values were slightly lower in Bio-Oss compared to Osteodens (16.3% ± 11.2 and 20.8% ± 12.1, respectively). The proportion of connective tissue was similar in both groups (44.7% Bio-Oss and 45.8% Osteodens). Age, gender, and residual height of the sinus floor did not show statistically significant differences. Conclusions: In this study, both graft materials (Bio-Oss and Osteodens) showed no statistically significant differences in their ability to regenerate suitable bone tissue for implant placement after 6 months of healing. Further studies with a larger sample size are needed to validate these results.

Introducción: La pérdida de elementos dentarios puede provocar una excesiva pérdida ósea en los segmentos maxilares posteriores, lo que puede limitar la colocación de implantes dentarios en esa zona, la neumatización del seno maxilar y la ausencia de elementos dentarios que mantengan el hueso activo son algunas de las principales causas. Entre la amplia gama de materiales de injerto disponibles, la hidroxiapatita bovina ha sido ampliamente estudiada y ha mostrado excelentes resultados clínicos e histológicos. Materiales y métodos: Se realizaron un total de 17 elevaciones del suelo del seno maxilar (n = 8 Osteodens, n = 9 Bio-Oss). Tras un periodo de cicatrización de 6 a 8 meses, se obtuvo un bloque de la zona injertada mediante trépanos y se analizó mediante histomorfometría. Resultados: El porcentaje de tejido óseo neoformado fue mayor en Bio-Oss (39,0% ± 11,1) en comparación con Osteodens (33,4% ± 8,3), mientras que los valores del injerto remanente fueron ligeramente inferiores en Bio-Oss en comparación con Osteodens (16,3% ± 11,2 y 20,8% ± 12,1, respectivamente). La proporción de tejido conjuntivo fue similar en ambos grupos (44,7% Bio-Oss y 45,8% Osteodens). La edad, el sexo y la altura residual del piso sinusal no mostraron diferencias estadísticamente significativas. Conclusiones: En este estudio, ambos materiales de injerto (Bio-Oss y Osteodens) no mostraron diferencias estadísticamente significativas en su capacidad para regenerar tejido óseo adecuado para la colocación de implantes tras 6 meses de cicatrización. Se necesitan más estudios con un tamaño de muestra mayor para validar estos resultados.

Quiste dentígero gigante en seno maxilar: Caso Clínico / Giant dentigerous cyst in the maxillary sinus: A Case Report

El proceso biológico de la odontogénesis es complejo, en ella participan mecanismos moleculares y celulares orientados a formar las estructuras dentarias, la alteración de estos mecanismos pueden originar los quistes dentígeros o foliculares. Estas patologías son cavidades anormales recubiertas por epitelio y con contenido líquido o semilíquido, rodeados generalmente de una capa de tejido conectivo; siempre asociados a la corona de dientes incluidos, son asintomáticos y de evolución lenta, descubiertas radiográficamente como una imagen unilocular y radiolúcidos, los de gran tamaño son infrecuentes, el tratamiento consiste en remoción quirúrgica completa.

The biological process of odontogenesis is complex, where molecular and cellular mechanisms participate at forming dental structures. The alteration of these mechanisms can cause dentigerous or follicular cysts, which are pathologies with abnormal cavities lined by epithelium and with liquid or semi-liquid content, usually surrounded by a layer of connective tissue; always associated with the crown of included teeth, they are asymptomatic and of slow evolution, discovered radiographically as a unilocular image and radiolucent. The large ones are infrequent and their treatment consists of complete surgical removal.

SMARCB1 (INI-1) – Deficient sinonasal carcinoma: Report of two cases

SMARCB1 (INI-1)-deficient sinonasal carcinoma is a rare, poorly differentiated carcinoma defined by complete loss of tumor suppressor gene SMARCB1 (INI-1) within the neoplastic cell nuclei demonstrated by the immunohistochemical stain. SMARCB1 (INI-1) gene inactivation has been implicated in the pathogenesis of a diverse group of malignant neoplasms that tend to share “rhabdoid” morphology. SMARCB1 (INI-1)-deficient sinonasal carcinoma was first reported by Agaimy et al. in 2014. These tumors are often basaloid with focal rhabdoid differentiation, prominent necrosis, increased mitotic activity, and aggressive behavior. Other than being INI-1 and NUT negative, they are positive for pancytokeratin and express variable immunoreactivity for squamous markers like p63 and neuroendocrine markers like synaptophysin. Most patients present with locally advanced disease and hence a combination of chemotherapy, radiotherapy, and surgery is usually recommended.

Case Analysis and Systematic Review of Aspergilloma

Introduction: Aspergillus fumigatus is the most prevalent fungal pathogen reported to cause diseases such as aspergilloma or aspergillosis in humans. Aspergillomas are commonly seen in a poorly drained and avascular cavitary space. Paranasal sinuses are most commonly involved, especially maxillary sinus. In the past two decades, the incidence of aspergillosis has increased substantially. Aims: To evaluate cases reported as aspergilloma of the maxillary sinus and to determine the percentage of cases involving aspergilloma of the maxillary sinus in healthy individuals. Materials and Methods: After the final full-text review,16 articles were included in this systematic review. Data extracted from these full-text articles was reviewed. Results: 83 % of cases had a history of dental procedures, with 42 % of those being due to infection from previous extraction sockets and 41 % due to root canal therapy (RCT). About 43% of the patients were immunocompromised, while 56% were healthy without any predisposing conditions. Conclusion: Aspergillus fungal infections of the paranasal sinuses are common and can occur in apparently healthy as well as immunocompromised individuals. Aspergilloma is the most common fungal infection involving the maxillary sinus with iatrogenic-dentogenic factors being predominant for initiation and progression of the infection. About 43% of the patients in this review were immunocompromised patients whereas 56% of the patients were healthy without any known predisposing condi- tions. The progression and prognosis of this disease depends on the location and immunologic status of the patient. So, it is very important for dentists to be cautious while performing any dental procedures so as not to initiate any iatrogenic infections.

Comunicaciones oroantrales: actualización y revisión de literatura

Introducción: la Comunicación Oroantral (COA) es el espacio que se crea entre el seno maxilar y la cavidad oral, la cual si no es tratada progresará a una Fístula Oroantral (FOA) o enfermedad sinusal crónica. El factor predisponente más común de una COA es la extracción de los dientes superiores posteriores (generalmente el primer o segundo molares). El objetivo de este estudio fue realizar una revisión de literatura con énfasis en implicaciones clínicas y las alternativas de tratamiento de una COA por medio de una actualización y revisión de información de interés. Métodos: se llevó a cabo una revisión de literatura por medio de una recolección y análisis de bibliografía de las comunicaciones oroantrales y la comparación y alternativas de tratamiento. Discusión: se han propuesto diversas técnicas para el manejo de una COA, entre las cuales se encuentran los colgajos locales, así como el uso de biomateriales, los cuales han dado resultados favorables en el cierre del defecto. Conclusión: el tratamiento de una COA tiene como propósito revenir su avance a una FOA, el desarrollo de sinusitis y/o que el defecto se acrecente; para ello, el clínico debe estar familiarizado con las diversas técnicas con base a la necesidad del paciente.

Introduction: the Oroantral Communication (OAC) is the space that is created between the maxillary sinus and the oral cavity, which if not treated will progress to an Oroantral Fistula (OAF) or chronic sinus disease. The most common predisposing factor for a COA is the extraction of the upper posterior teeth (usually the first or second molars). The aim of this study was to carry out a literature review with emphasis on clinical implications and treatment alternatives of a COA through an update and review of information of interest. Methods: a literature review was carried out through a collection and analysis of bibliography of oroantral communications and the comparison and treatment alternatives. Discussion: various techniques have been proposed for the management of an AOC, among which are local flaps, as well as the use of biomaterials, which have given favorable results in closing the defect. Conclusion: the treatment of an AOC has as purpose to prevent its progression to an AFO, the development of sinusitis and/or that the defect increases; To do this, the clinician must be familiar with the various techniques based on the patient's needs.

Techniques of Maxillary Sinus Floor Elevation

Posterior maxillary region is often limited for standard implant placement because of reduced residual vertical bone height. An elevation of the maxillary sinus floor is one option in solving this problem. This article describes the various surgical techniques that can be used to enter the sinus cavity, elevating the sinus membrane and placing the bone grafts for placement of dental implants in the resorbed posterior maxillary region.

Comparación de la radiografía panorámica con la tomografía computarizada de haz cónico para evaluar la relación entre los dientes posteriores y el seno maxilar / Comparison of panoramic radiography with cone beam computed tomography for assessing the relationship between posterior teeth and the maxillary sinus

RESUMEN Objetivo : Comparar la radiografía panorámica (RP) con la tomografía computarizada de haz cónico (TCHC) para evaluar la relación entre los dientes posteriores y el seno maxilar (SM). Material y métodos : Se analizaron 533 dientes posteriores del maxilar superior en 80 sujetos sometidos a RP y TCHC en el Centro Dental Docente (CDD) de la Universidad Peruana Cayetano Heredia (UPCH), durante el periodo 2016-2019. Se realizó un estudio transversal, observacional, descriptivo y retrospectivo. Los datos y las observaciones se registraron en una ficha de datos diseñada para este estudio. Resultados : La relación diente-seno maxilar más frecuente fue la clase 0 (ápice radicular sin contacto con el piso del seno maxilar [PSM]), con predominio del sexo femenino, del rango etario de 48-57 años y en ambos premolares. En la clase 0 se encontró una mayor concordancia entre ambas técnicas de imagen. La RP fue muy precisa para detectar la clase 0 en ambos premolares; sin embargo, mostró una precisión muy pobre para detectar la clase 3 (PSM curvado hacia abajo y ápice por encima del mismo) en todos los tipos de dientes. Conclusiones : Las RP y TCHC presentan baja concordancia en relaciones de clase 3, dado que todos estos casos observados en RP muestran una clasificación menor en TCHC; por lo tanto, la RP es suficiente para proporcionar la verdadera relación entre premolares y SM, pero en el caso de molares es necesaria una TCHC.

ABSTRACT Objective : To compare panoramic radiography (PR) with cone beam computed tomography (CBCT) to assess the relationship between posterior teeth and the maxillary sinus. Material and methods : A comprehensive analysis was conducted on 533 posterior teeth of the maxilla of 80 subjects who underwent panoramic and tomographic imaging at the Teaching Dental Center (TDC) of the Universidad Peruana Cayetano Heredia (UPCH) between 2016 and 2019. It was a cross-sectional, observational, descriptive, and retrospective study. Data and observations were recorded on a data sheet designed for this study. Results : The most frequent relationship between teeth and maxillary sinus (MS) was class 0 (root apex without contact with the floor of the MS), predominantly observed on women aged 48 to 57, and in both premolars. In class 0, a greater concordance was found between both radiographic methods. PR was very accurate in detecting class 0 in both premolars, but very inaccurate in detecting class 3 (floor of MS curved downward and apex above it) in all tooth types. Conclusions : Panoramic and tomographic images present low concordance in class 3 relationships as all cases observed in panoramic images show a lower classification in tomography. Therefore, PR is sufficient to provide the true relationship between premolars and maxillary sinus. However, in the case of molars, a three-dimensional image is required.

Prevalencia del pseudoquiste antral y mucositis apical en los senos maxilares como entidades frecuentes encontradas en radiografías panorámicas en pacientes de un centro radiológico de Huacho, Lima-Perú, 2019 / Prevalence of antral pseudocyst and apical mucositis in the maxillary sinus as common entities found in panoramic x-rays among patients at a radiological center in Huacho, Lima, Peru, 2019

RESUMEN Antecedentes: Los senos maxilares están directamente relacionados con el proceso dentoalveolar, por lo que el conocimiento de las patologías que pueden afectar y comprometer cualquiera de ambas estructuras facilitará un correcto diagnóstico y tratamiento. Objetivo: Determinar la prevalencia de pseudoquiste antral y mucositis como entidades frecuentes encontradas en radiografías panorámicas en pacientes de un centro radiológico de Huacho, Lima-Perú, en 2019. Material y métodos: Estudio transversal, observacional, descriptivo y retrospectivo. De un total de 1646 radiografías panorámicas virtuales recolectadas en el centro radiológico de Huacho, se asignó como población muestral 1224 radiografías, luego de tener en cuenta los criterios de inclusión y exclusión. Las variables fueron pseudoquiste antral, engrosamiento de la mucosa, periodontitis apical, mucositis, edad, sexo y mes de toma radiográfica. Se realizó análisis descriptivo y bivariado. Resultados: La prevalencia de pseudoquiste antral de origen respiratorio fue de 5,71 %; de mucositis, 13,07 %; y de ambas entidades correlacionadas, 0,90 %. Se encontró asociación significativa entre la presencia de pseudoquiste antral de origen respiratorio y el sexo masculino (p = 0,007). Conclusiones: La presencia de lesiones apicales que condicionan tanto el engrosamiento de la mucosa antral como la presencia de pseudoquiste antral odontogénico, correlacionadas, resultó poco prevalente (y no rara).

ABSTRACT Maxillary sinuses are directly related to the dentoalveolar process, so knowledge of the pathologies that may affect and compromise either of the two structures can facilitate a correct diagnosis and treatment. Objective: To determine antral pseudocyst and apical mucositis prevalence as frequent entities found in panoramic x-rays among patients at a radiological center in Huacho, Lima, Peru, 2019. Material and Methods: Cross-sectional, observational, descriptive and retrospective study. From a total of 1,646 virtual panoramic x-rays collected at a radiological center in Huacho, 1,224 x-rays were used as sample population after taking into account the inclusion and exclusion criteria. The variables were antral pseudocyst, thickening of the mucosa, apical periodontitis, apical mucositis, age, gender, and month in which x-ray was taken. Descriptive and bivariate analysis was performed. Results: Antral pseudocyst of respiratory origin prevalence was 5.71%, mucositis prevalence was 13.07%, and prevalence of both correlated entities was 0.90%. A significant association was found between the presence of antral pseudocyst of respiratory origin and male gender (p=0,007). Conclusion: The occurrence of apical lesions leading to both thickening of the antral mucosa and the presence of odontogenic antral pseudocysts, while not rare, was found to be of low prevalence.

Relación entre el seno maxilar y ápices de dientes postero- superiores con tomografía computarizada de haz cónico / Relationship between the maxillary sinus and apices of posterior-superior teeth using cone beam computed tomography

El conocimiento de la relación entre el seno maxilar y los ápices de los dientes posterosuperiores es fundamental para evitar complicaciones frente a distintos tratamientos. Estudio descriptivo de corte transversal, con muestra por conveniencia de 383 imágenes de raíces de dientes posterosuperiores obtenidas por medio de tomografía computarizada de haz cónico (TCHC) de un centro radiológico en Viña del Mar, Chile. Cada raíz fue clasificada según su relación vertical con el seno en 4 categorías (0: ápice no se encuentra en contacto con contorno inferior del seno; 1: ápice en contacto con seno; 2: ápice lateralmente al seno; 3: ápice se protruye en seno). Además se midió su distancia en mm. Los datos fueron analizados con estadística descriptivas. El diente más lejano al seno maxilar fue el primer premolar superior (4.2 mm), seguido por el segundo premolar superior (1 mm). En el primer molar superior la raíz más lejana fue la mesio-vestibular (MV) 1mm, seguida por la raíz disto-vestibular (DV) 0.6mm y la raíz palatina (P) -1mm. En el segundo molar superior la raíz más lejana fue P 0.4mm, luego la DV 0.3mm, y MV -0,11mm. En cuanto a las categorías, se observó que la mayoría de las raíces se encuentran alejadas del seno siendo la raíz P del primer molar superior y la raíz MV del segundo molar superior las que se encuentran mayormente protruidas (42 % y 26 % respectivamente). El primer premolar es el diente posterosuperior que se encuentra más alejado del seno maxilar y a medida que se avanza hacia posterior hay tendencia a disminuir la distancia entre los ápices y el seno maxilar.

SUMMARY: Knowledge of the relationship between the maxillary sinus and the apices of the upper posterior teeth is crucial to avoid complications when considering different treatments. A descriptive cross-sectional study was carried out, with a convenience sample of 383 images of upper posterior teeth roots, obtained by means of cone beam computed tomography (CBCT) from a radiological center in Viña del Mar, Chile. Each root was classified according to its vertical relationship with the sinus into 4 categories (0: apex is not in contact with the lower contour of the sinus; 1: apex is in contact with the sinus; 2: apex laterally to the sinus; 3: apex protrudes in sinus). In addition, its distance was measured in mm. The data were analyzed with descriptive statistics. The tooth farthest from the maxillary sinus was the maxillary first premolar (4.2 mm), followed by the maxillary second premolar (1 mm). In the upper first molar, the most distant root was the mesiobuccal (MV) 1mm, followed by the distobuccal root (DV) 0.6mm and the palatal root (P) -1mm. In the upper second molar, the furthest root was P 0.4mm, then DV 0.3mm, and MV -0.11mm. In reference to the categories, it was observed that most of the roots are far from the sinus, with the P root of the first upper molar and the MV root of the second upper molar being the most protruding (42 % and 26 % respectively). The first premolar is the posterior maxillary tooth that is furthest from the maxillary sinus and as one advances posteriorly there is a tendency to decrease the distance between the apices and the maxillary sinus.

Análisis bidimensional de la permeabilidad de vías aéreas con el tamaño de senos maxilares y su relación con el desarrollo de la clase esqueletal en una población mexicana / Two-dimensional analysis of airway permeability with maxillary sinus size and its relationship with the development of skeletal class in a Mexican population

Comparar la permeabilidad de las vías aéreas y el tamaño de los senos maxilares en relación con la clase esqueletal. se midieron 90 radiografías lateral de cráneo, divididas en 3 grupos, comparando las 3 clases esqueletales, las cuales se determinaron con la medida ANB de Steiner, y estas a su vez en dos subgrupos que fueron hombres y mujeres, en las cuales se utilizó el análisis de McNamara para el análisis de vías aéreas y para el área del seno maxilar se tomaron dos medidas una antero-posterior y cefálica-caudal. Al comparar los hombres con las mujeres se identificó significancia estadística en vía área superior de clase II (p=≤0.017), vía aérea inferior de clase III (p=≤0.006). Al comparar las clases esqueletales en hombres se identificó diferencias en la vía aérea superior en las clases I vs III (p=≤0.05), inferior en la clase I vs III (p=≤0,001) y II vs III (p=≤0.044). Con respecto a mujeres se identificó significancia en la vía aérea superior al comparar la clase I vs II (p=≤0,043), vía aérea inferior en la clase II vs III (p=≤0.05), longitud del seno maxilar al comparar clase I vs II (p=≤0.017). Entre la clase I esqueletal y la clase II, el tamaño de los senos maxilares resulto menor en longitud en las mujeres de clase II esqueletal. Entre la clase I y clase III esqueletal en hombres, se encontró una longitud menor en la vía aérea superior e inferior en la clase I. Las vías aéreas resultaron en menor tamaño en sujetos de clase II.

SUMMARY: To compare the airway permeability and the size of the maxillary sinuses in relation to the skeletal class. 90 lateral skull radiographs were divided into 3 groups, comparing the 3 skeletal classes, which were determined with Steiner's ANB measurement, and these were once in two subgroups that were men and women, in any McNamara analysis was used for the analysis of airways and for the maxillary sinus area measurements were made an antero-posterior and cephalic-caudal. When comparing males with females, statistical significance was identified in the upper class II route (p=≤0,017), lower class III airway (p=≤0.006). At least skeletal classes in men, differences were identified in the upper airway in classes I vs III (p=≤0.05), lower in class I vs III (p=≤0.001) and II vs III (p=≤0.044). With respect to women, significance was identified in the upper airway when comparing class I vs II (p=≤0.043), lower airway in class II vs. III (p=≤0.05), maxillary sinus length to class I vs II (p=≤0.017). Between skeletal class I and class II, maxillary sinus size was shorter in length in skeletal class II women. Between class I and skeletal class III in men, a lower length was found in the upper and lower airways in class I. The airways were found to be smaller in class II subjects.

Rare Incidental Foreign Body in the Maxillary Sinus on Routine Radiographic Examination

Accidental entry of any foreign body into the paranasal sinus could be due to known causes or unknown causes with the patient being either symptomatic or sometimes asymptomatic. Such asymptomatic conditions make it difficult to detect the foreign body for an indefinite period which on a longer duration may lead to various complications later. Routine radiographic examination during dental checkup reports to serve a good purpose in these kinds of cases by accidental detection of such foreign bodies in the maxillofacial region leading to early diagnosis and timely management. The present paper highlights the importance of routine radiographs in detecting a rare type of foreign body (nasal stud) in the maxillary sinus in the asymptomatic patient.

Retrieval-of-displaced-root-fragment-associated-with-fungal-ball-in-the-maxillary-sinus-using-functional-endoscopic-sinus-surgery-a-case-report

Introduction: Fungal ball is a non-invasive sinus disease and the incidence of this disease has increased in recent years and also several case reports and case series have suggested a relationship with the accidental displacement of root into maxillary sinus. We report a case where fungal ball was removed along with the dental root fragment which was accidentally displaced into the maxillary sinus following traumatic dental extraction. A 32-years-oldCase Report: female patient presented to Maxillofacial Surgery Department with complaint of pain in the left orofacial region for one month. The patient had a history of traumatic extraction of posterior maxillary teeth 4 years back. On examination, no dental cause of pain was detected. On further evaluation, a foreign body within the left maxillary sinus was seen in the panoramic radiograph. Computed tomography images revealed displaced root in the left maxillary sinus with surrounding heterogenous soft tissue opacity. Following the detection of foreign body, patient underwent Functional Endoscopic Sinus Surgery (FESS) and the root was retrieved and the adjacent soft tissue specimen was sent for histopathological examination. The presence of fungus consistent with the Aspergillus species was confirmed. Conclusion: This article emphasizes the importance of atraumatic dental extraction, the association of fungal ball with displaced root and the utility of FESS in clearing the same.

The outcome of transnasal endoscopic total maxillectomy in the treatment of sinonasal adenoid cystic carcinoma / 临床耳鼻咽喉头颈外科杂志

Objective:To assess the prognosis of sinonasal adenoid cystic carcinoma with hard palatine invasion treated by transnasal endoscopic total maxillectomy. Methods:Clinical data of twenty-six patients with sinonasal adenoid cystic carcinoma invading hard palatine treated by transnasal endoscopic total maxillectomy between May 2014 and December 2020 was analyzed retrospectively. Survival rate, local recurrence and distant metastasis were analyzed using Kaplan-Meier method. Cox regression was used to investigate the prognosis factors. Masticatory function after maxillectomy has also been assessed using the questionnaire of patients' satisfaction about masticatory function. Results:Margins in 8 patients（30%） were positive. The median time of follow-up was 38 months（6 to 85 months）. Twenty-five patients recurred. Four patients died of distant metastasis. The 5-year overall survival rate and relapse-free survival rate was 79.5% and 89.1%, respectively. Independent predictors of outcome on multivariate analysis were positive margin（P=0.018）, recurrence（P=0.006） and distant metastasis（P=0.04）. Conclusion:Transnasal endoscopic total maxillectomy could be performed for the treatment of the sinonasal adenoid cystic carcinoma with hard palatine invasion. Positive margin, local recurrence and distant metastasis were important predictors for patients' prognosis.

The anatomical limit and strategies for molar movement during orthodontic treatment / 口腔疾病防治

@#In many cases, tooth movement over a considerable distance is needed to meet the major goal of orthodontic treatment, which has always been to correct malocclusion and improve the facial profile in patients with skeletal malocclusion. However, tooth movement over a considerable distance also carries risks of dehiscence, fenestration, root exposure, and so forth. The reason lies in neglecting many limits for tooth movement, especially anatomical characteristics. This review focuses on structural limits for orthodontic molar movement, such as the alveolar cortex, the maxillary sinus floor, and the mandibular canal. In addition, we set the strategy in clinical orthodontics. For the alveolar cortex and the mandibular canal, orthodontists are recommended to move the root away from the cortical bone initially and formulate personalized molar movement plans according to clinical examination and cone-beam computed tomography (CBCT) and other imaging examinations. First, the molar root was controlled by torque away from the bone plate, and then, the molar movement amount and direction were controlled according to the personalized movement path. In regard to the maxillary sinus floor, light and continuous forces and scientific biomechanics are suitable for bodily tooth movement. In summary, better therapeutic efficacy and long-term stabilization could be achieved by circumventing the limits and risks caused by anatomical limitations and characteristics.

Apport de la piézochirurgie et l'ostéotomie dans la surélévation sinusienne par voie crestale / Contribution of piezosurgery and osteotomy in crestal sinus lift

Dans la région postérieure maxillaire, après extractions dentaires, les crêtes subissent une résorption osseuse continue. Dans cette région s'ajoute un obstacle anatomique formé par le sinus maxillaire qui nécessite des conduites particulières avant et au moment de la pose d'implants. Parmi les techniques d'augmentation de volume osseux, la voie d'abord crestale

In the maxillary posterior region, after dental extractions, the ridges undergo continuous bone resorption. In this region, there is also an anatomical obstacle formed by the maxillary sinus, which requires special management before and at the time of implant placement. Techniques for bone augmentation include the crestal approach with osteotomes and piezo surgery

A Study on Morphometry and Related Surgical Importance of Naso Lacrimal Duct

Introduction: The Nasolacrimal duct is the terminal part of the nasolacrimal apparatus or tear apparatus. The anatomy of lateral nasal wall is Important for planning the surgeries on lacrimal duct through intranasal approach. Objective: The current study was designed to review the anatomy of nasolacrimal duct in relation to the lateral nasal wall. Material and method: Thirty sagittal sections (14 right and 16 left side) of head and neck of formalin fixed adult cadavers of known sex, gender, ethnicity present in department of anatomy GMCH, Chandigarh were studied. The following parameters were made using a digital calliper and rounded off to the nearest millimetres. 1.Length of nasolacrimal duct (NLD Length) 2. Nearest distance from the nasolacrimal duct to maxillary sinus ostium (NLD - MSO) 3. Nearest distance from the NLD to the anterior nasal spine. (NLD- ANS)4. Nearest distance of the intranasal orifice of the NLD to the nasal floor (NLD- NF) 5. Nearest distance of the intranasal orifice of the NLD to the nasal roof. (NSD- NR) 6. Nearest distance of the intranasal orifice of the NLD to the anterior attachment of the Inferior concha. (NSD- AIT). Observations: In our study the average length of the NLD was 19.8±1.57mm. The intranasal orifice of the NLD was observed to be located on an average of 24.5±2.6mm from the anterior nasal spine, ranging from 5.5-2. 9mm.The average distance from the nasal roof was found to be 32.2±1.67mm and 16.08±1.71mm from nasal floor. In addition, the average distance from the anterior attachment of inferior nasal concha was found to be 14.82±2.37mm. In our study the NLD was an average of 4.08±0.67mm anterior to MSO at the level of the anterior attachment of the MT. On Comparing right and left side The NLD Was found to be slightly longer 22.7 in comparison of 22.2 mm on left side. The distance of NLD From MSO was also found to be larger on left side. The distances of NLD-ANS, NLD NR, NLD -AIT and NLD- NF were also longer on left side. Conclusion: We found that most of the parameters were closer to a study done by Ertugel while the NLD-NF distance was more in our specimen. Running title: nasolacrimal duct: morphometry, surgical importance

Surgical outcomes between two endoscopic approaches for maxillary cysts

Abstract Objective: To compare recurrence rates and symptomatic relief in symptomatic maxillary sinus Retention Cysts (RCs) between Middle Meatus Antrostomy (MMA) alone and Inferior Meatus Antrostomy (IMA) with basal mucosa electrocoagulation. Methods: Patients with symptomatic unilateral maxillary RCs were randomly allocated to MMA (n = 54) and IMA combined with mucosa electrocoagulation (n = 53) groups. Symptomatic relief, cyst recurrence, and closure of the antrostomy opening were compared at 12-months postoperatively. Results: Symptomatic failure occurred in 13 (12.1%) patients, including 9 (16.7%) MMA and 4 (7.5%) IMA patients; this difference was not statistically significant (p = 0.251). Postoperative cyst recurrence occurred in 16 (29.7%) and 1 (1.9%) patient in the MMA and IMA groups, respectively (p<0.0001). Closure of the opening occurred in 7 (13.0%) and 17 (32.1%) patients in the MMA and IMA groups, respectively (p = 0.032). However, there were no significant pairwise correlations between closure of the opening and symptomatic failure or cyst recurrence. Conclusion: IMA combined with basal mucosa electrocoagulation and MMA alone provided similar symptomatic relief for symptomatic maxillary RCs, but IMA had shorter operation times and lower postoperative recurrence rates of RCs. Level of evidence: Level 1b.

Cone beam computed tomographic evaluation of infraorbital canal protrusion into the maxillary sinus and its importance for endoscopic surgery

Abstract Objective: The aim of this retrospective study is to investigate the prevalence of Infraorbital Canal Protrusion (ICP) degree into the maxillary sinus and its relationship with variations in adjacent structures on Cone Beam Computed Tomography (CBCT) images. Methods: 350 CBCT images (700 Infraorbital Canal [IC]) were evaluated retrospectively. ICP was divided into 3 subtypes according to the protrusion degree. The correlation between IC types and variations in adjacent anatomical structures (Haller cell, middle nasal concha pneumatization, maxillary sinus mucosal thickening and septa) was evaluated. The distance between Infraorbital Canal and Cnine Root (IC-CR) was also measured. For type 3, measurements were performed on IC as the length of the bony septum from the IC to the Mxillary Sinus Wall (IC-MSW), the distance from the inferior orbital rim, where the IC begins to protrude into the maxillary sinus (IOR-ICP), the vertical distance from the IC to the Maxillary Sinus Roof (IC-MSR) and Floor (IC-MSF). Results: The prevalence of type 1, 2 and 3 was 62.9%, 29.1%, and 8% respectively. IC-CR was 10.2, 10.7 and 11.4 mm in type 1, 2 and 3, respectively. IC-MSW, IOR-ICP, IC-MSRand floor IC-MSF was 3.8, 10.9, 7.4 and 27.7mm, respectively. On the right and left side, statistically significant correlation was found between IC types and the presence of the Haller cell and sinus septa. But there was no significant correlation between IC types and middle concha pneumatization. Conclusion: Accurate diagnosis of ICP is very important in preventing infraorbital nerve damage in surgical procedures to be performed in the maxillary region. The results of this study could be a guide for surgical planning in this region. Level of evidence: Retrospective study.