ABSTRACT
Introduction: Thermocycling is an in-vitro process; it may affect the bonding strength between tooth and resin which is depending upon the adhesive system. Aim and Objectives: To evaluate and compare the thermocycling effect on shear bond strength of RelyX Unicem and G-CEM Linkace to polyether ether ketone (PEEK) surface. Materials and Methods: A total of 40 PEEK disk-shaped specimens were fabricated with dimensions of 10 × 3 mm and randomly allocated into two groups. Group A was cemented with Rely X Unicem material and Group B was cemented with G-CEM Linkace. About 10 specimens from each group were thermocycled 500 times at 5°C and 55°C. By applying force at the speed of 1 mm/min using a universal testing machine, shear bond strength was measured. Results: The mean bond strength was compared using paired t test. There was a significant difference even before and after thermocycling. Conclusion: In this experiment, Shear bond strength (SBS) of G-CEM Linkace showed more even before and after thermocycling when compared to RelyX. Also bond strengths of two cements decreased after thermocycling.
ABSTRACT
AIM: To clinically evaluate the nature of precancerous and cancerous lesions associated with tobacco consumption habit and to correlate clinical profile with the histopathological findings of clinically suspected precancerous and cancerous lesions. MATERIALS AND METHODS: These included the examination of patients who visited the outpatient department (OPD) of the institute that includes 1,500 patients who had tobacco chewing habits were classified into the following two groups according to their characteristics. The study group comprised 270 patients, of which 170 gave consent for biopsy and 100 patients who not gave consent were counseled for tobacco cessation. RESULTS: Among 270 patients, the highest number of patients, 146 (54.07%) patients, were found to be smokeless tobacco consumers followed by 65 (24.07%) patients who were smoked tobacco consumers while 59 (21.85%) patients were found to have both the habits. Wide variation was noted in duration and frequency of habit. Most prevalent site was the buccal mucosa affected in 138 (51.11%) patients who consumed both smoked as well as smokeless tobacco. And on clinical examination, 138 (51%) patients had leukoplakia followed by 54 (20%) patients with oral squamous cell carcinoma and 40 (15%) patients with oral submucous fibrosis (OSMF). Other patients were tobacco pouch keratosis 17 (6%), smoker's melanosis 8 (3%), smoker's palate 7 (3%), and erythroplakia 6 (2%). The patients who gave consent (170 patients) were evaluated histopathologically to correlate with clinical findings. CONCLUSION: Tobacco-related oral lesions are also high, which brings an alarming signal toward the development of cancer. Our contribution as healthcare providers can be made by conducting more oral health education programs and educating the general population about the adverse effects of tobacco. The appropriate clinical assessment and categorization of all these lesions aided us in motivating patients to undergo necessary treatments and also to discontinue their habits in order to prevent deterioration of their conditions. CLINICAL SIGNIFICANCE: Set up de-addiction centers in dental colleges and help tobacco users in discontinuing their habits. Interestingly, this study also served as a mirror for those patients who were unaware of the lesions they were giving abode to in their oral cavities.
