Inferior Wall Of Maxillary Sinus Research Articles

Relationships between the inferior wall of maxillary sinus and the roots of the maxillary molars

The aim of the study is to evaluate the position of the roots of the first and second upper molars relative to the bottom of the maxillary sinus (maxillary sinus) according to cone-beam computed tomography (CBCT). The CBCT scans of 150 patients (69 men and 81 women) from the database of the X-ray department of the 11th City Clinical Hospital of Minsk who applied for dental care were studied. There are 4 variants of vertical relationships between the roots of the teeth and the lower wall of the maxillary sinus. At the contact of the molar roots and the bottom of the HPV, 3 variants of the horizontal relationship between the roots of the teeth and the bottom of the maxillary sinus in the frontal plane were identified. The root apices of the maxillary molars can be located below the level of the MSF (type 0; 16.69%), contact with MSF (types 1-2; 72%) or protrude into the sinus cavity (type 3; 11.31%) at a distance of up to 6.49 mm. The roots of the second maxillary molar showed greater proximity to the MSF than the first molar roots and more often protruded into the maxillary sinus. The most common type of horizontal relationship between the molar roots and the MSF, in which the lowest point of the MSF was located centrally between buccal and palatal roots. It was found that the proximity between the roots and the MSF correlates with maxillary sinus vertical dimension. This parameter was significantly greater in type 3 when the roots protruded into the maxillary sinus than in type 0, when there was no contact between the MSF and the root apices of the molar teeth. Significant individual variability in the anatomical relationships between the roots of the maxillary molars and the MSF indicates the need for the mandatory appointment of cone-beam computed tomography in preoperative planning for the extraction of these teeth and/or their endodontic treatment.

Posteriyor Maksillanın Kemik Morfolojisi ve Maksiller Sinüsün Seyri: İmplant Tedavisi için Üç Boyutlu Analiz

Objective: The purpose of this study was to assess morphologic features of alveolar bone supporting maxillary premolars and molars and to determine the relationship between maxillary sinus and teeth using cone beam computed tomography (CBCT).Material and Methods: In CBCT scans of 100 patients, the thickness of both trabecular bone and cortical plates surrounding 652 posterior teeth were measured and the relationship between teeth and maxillary sinus was classified. Also, the angle between the teeth and the alveolar crest was measured.Results: Of the teeth examined, 25 % were in contact with the inferior wall of maxillary sinus, 12% had penetrated the sinus and 63 % were far away from maxillary sinus. The closest root to the maxillary sinus floor was mesiobuccally root of second molar teeth with 1.3 mm distance. The teeth which had thinnest bone configuration were maxillary first premolars. There were no significant differences for measurements between sides and gender (p>005). Buccal bone thickness and distance to the maxillary sinus floor showed a negative correlation in molars (p˂0.001 and 0.003).Conclusion: In order to prevent possible complications, a three-dimensional analysis of the posterior maxilla and maxillary sinus is required before implant procedures to be performed on the maxillary posterior region.

Clinical research on surgical treatment of benign lesions in maxillary sinus by modified prelacrimal duct recess approach

Objective:To explore the clinical effects, surgical procedure and indications of surgical treatment for benign lesions in maxillary sinus through modified prelacrimal duct recess approach. Method:All 21 patients in this study who diagnosed with benign lesions in maxillary sinus, received routine preoperational exam and underwent endoscopic maxillary sinus surgery through modified prelacrimal duct recess approach. Postoperatively patients received routine medical treatment, and regular follow-up for average 11.3 months(from 3 months to 16 months). Result:Among 21 patients, there were 9 cases diagnosed with maxillary sinus cyst, 6 cases diagnosed with maxillary sinus choanal polyps, and 5 cases diagnosed with maxillary sinus hemorrhagic and necrotic polyps, 1 case of maxillary sinus root cyst. During the operation, the roots of maxillary sinus cyst or polyps were found in anterior or inferior wall of maxillary sinus. All patients recovered very well without recurrence. Conclusion:Modified prelacrimal duct recess approach appears to be a safe and effective method to resect benign lesions in the maxillary sinus, especially when lesions involved in anterior and inferior wall of the maxillary sinus.

Relationship between inferior wall of maxillary sinus and maxillary posterior teeth using cone-beam computed tomography in healthy and chronic periodontitis patients.

Background:For dental implant planning in maxillary posterior region, it is essential to know their relationship with maxillary sinus. Maxillary posterior teeth affected by chronic periodontitis usually have a poor prognosis, ultimately leading to tooth loss. Following tooth loss, significant bone resorption occurs resulting in compromised remaining bone support for dental implant placement.Aim:The study aims to determine the relationship between inferior wall of maxillary sinus and the root apices of maxillary posterior teeth.Materials and Methods:The study sample consisted of cone-beam computed tomography images of 150 patients. Vertical distance between inferior wall of maxillary sinus and root apices and furcation area of maxillary posterior teeth as well as crest of the edentulous ridge were measured in periodontally healthy individuals (Group 1), chronic periodontitis patients (Group 2), and in patients with edentulous maxillary posterior region (Group 3). The data were analyzed using one-way analysis of variance and Tukey's test to compare mean distances between groups and molars.Results:There was a significant difference in mean distances between Group 1 (3.067 ± 1.600), Group 2 (1.602 ± 0.536) and Group 3 (1.279 ± 0.476) (P = 0.00001) and between mean distances of four sites (7.101, 0.932, 0.903, and 0.402 mm) (P ≤ 0.05). There was no significant difference in mean distances between the first and second molars (2.1469; 2.0996) (P = 0.787).Conclusion:For planning of dental implant placement in maxillary posterior region, the clinician should consider the vertical relationship between maxillary sinus floor and root apices of maxillary molars.

Topographic anatomy of the inferior wall of the maxillary sinus in Koreans

Knowledge of the relationship between the root apex and the inferior wall of the maxillary sinus are crucial for diagnosing and treating a sinus pathosis as well as in assisting in dental implantation. Therefore, identifying the proximity between the root apex and the inferior wall of the sinus and clarifying the cortical thickness of the inferior wall of the sinus is essential for determining the topography of a spreading dental infection into the maxillary sinus. Accordingly, knowledge of the topography between the root apex and the inferior wall of maxillary sinus is important for diagnosing and planning dental implantation, endodontic procedures, and orthodontic treatment. This study was undertaken to clarify the morphological and clinical characteristics of the maxillary sinus, particularly the inferior wall of the sinus in Koreans, and to identify the relationship between the inferior wall of the maxillary sinus and the roots of the maxillary teeth. Twenty-four sides of the maxillae of hemi-sectioned Korean heads were used in this study. All specimens were decalcificated and sectioned coronally. On the sectioned specimens, 21 items were measured using an image analyzing system. The distances between the each root apex and the inferior wall of the maxillary sinus were measured. The distance from the root apex to the inferior wall of the sinus was the shortest in the second molar area and the longest in the first premolar area. The thickness of the cortical plate of the inferior wall of the maxillary sinus was thinnest in the first premolar area but it was thickest in the second premolar area. The vertical relationship between the inferior wall and the roots of the maxillary molars was classified into five types. Type I (the inferior wall of the sinus located above the level connecting the buccal and lingual root apices) dominated (54.5% in the first molar area, 52.4% in the second molar area). The horizontal relationship between the inferior wall of the sinus and the root apex was classified into three types. Type 2 (the alveolar recess of the inferior wall of the sinus was located between the buccal and lingual roots) was most common (80% in the first and second molar area). Overall, this study demonstrated the many anatomical characteristics and determined the relationships between the maxillary sinus and their surrounding structures. These findings may have an impact on the clinical management of patients.

HISTOPATHOLOGICAL STUDY ON CARCINOMA OF MAXILLARY SINUS

The author attempted observations on 20 cases with upper jaw cancer clinically and histopath-ologically. Following results were obtained:1. Most patients were 40-60 years old. In the numbers of affected side there was no big differe-nce between right and left.2. All tumors were squamous cell carcinomas except one undifferenciated carcinoma.3. In the center parts of tumor the growth of carcinoma cells was rather expansive and in the peripheral parts it was infiltrative. Extent of the infiltration of carcinoma was different in the parts of tumor.4. The hone destructions were most frequently found at the orbital wall of maxillary sinus, and besides they were found at the ethomoidal sinus and the lateral wall, the anterior wall and the inferior wall of maxillary sinus. And after bone destruction by tumor, the formation of fibrous capsule against tumor was observed at the orbital, the posterior and the lateral wall of maxillary sinus.5. We could notice that in spite of large bone destraction of the orbital wall the infiltration of carcinoma cells into the orbita was prevented by the formation of fibrous capsule.6. In the most cases carcinoma cells did not infiltrate through the orbital wall, but they destro- yed the lateral wall of maxillary sinus and invaded the soft tissue and infiltrated into the orbita through the inferior orbital fissure.