ABSTRACT
Introduction: Metronomic chemotherapy (MC) is an emerging therapeutic option in clinical oncology and it may prove usefulat least in metastatic head and neck squamous cell carcinoma (HNSCC) patients. To develop rational therapeutic strategies,it is important to identify molecular targets that are linked to the pathogenesis of HNSCC.Aim: The aim of the study was to assess the effect of oral MC on changes in quality of life (QOL) in advanced/recurrent HNSCCpatients.Materials and Methods: Patients with advanced, metastatic, and recurrent HNSCC patients who are not amenable to localtreatment with surgery, radiotherapy, and chemotherapy were included in the study. QOL assessed with the European organizationfor research and treatment of cancer (EORTC) QLQ-C30 and QLQ-H&N 35 questionnaires.Results: In this study, 50 patients were included, 37 patients (74%) become pain-free at the end of 6 months. A decreasedpain grade was observed in another 13 patients (26%). Mean QLQ-C 30 score at the time of presentation was 68.67, 75.35at 2 months, 81.26 at 4 months, and 85.38 at the end of 6 months. Mean QLQ-H&N 35 score at the time of presentation was61.53, 72.16 at 2 months, 76.43 at 4 months, and 81.69 at the end of 6 months. In subgroup analysis, both QLQ-C30 andQLQ-H&N 35 significantly correlated with disease progression.Conclusion: The use of oral metronomic therapy with methotrexate and celecoxib significantly improves the QOL and improvespain control in patients with advanced/recurrent HNSCC
ABSTRACT
Context: During fixed orthodontic therapy, when the stress levels in the periodontal ligament (PDL) exceedsan optimum level, it could lead to root resorption. Aims: To determine an apical stress incident on the maxillary central incisor during tooth movement with varying cemental and periodontal ligament thickness by Finite Element Method (FEM) modeling. Settings and Design: A three dimensional finite element model of a maxillary central incisor along with enamel, dentin, cementum, PDL and alveolar bone was recreated using EZIDCOM and AUTOCAD software. ALTAIR Hyper mesh 7.0 version was used to create the Finite Element meshwork of the tooth. This virtual model was transferred to Finite Element Analysis software, ANSYS where different tooth movements were performed. Materials and Methods: Cemental thickness at the root apex was varied from 200 μm to 1000 μm in increments of 200 μm. PDL thickness was varied as 0.24 mm and 0.15 mm. Intrusive, Extrusive, Rotation and Tipping forces were delivered to determine an apical stress for each set of parameters. Results: Results indicated that an apical stress induced in the cementum and PDL, increased with an increase in cementum and PDL thickness respectively. Apical stress induced in the cementum remained the same or decreased with an increase in the PDL thickness. Apical stress induced in the PDL decreased with an increase in the cementum thickness. Conclusion: The study concluded that the clinical delivery of an orthodontic forces will cause stress in the cementum and PDL. Hence, it is necessary to limit the orthodontic force to prevent root resorption.