Aims:Present study aimed at evaluating the colour stability and flexural strength of flexible denture base materials (Valplast) and Polymethyl methacrylate (PMMA) denture base material (Meliodent) processed by two different methods (Injection moulding and compression moulding) after immersing them in three different denture cleansers with acidic, basic and neutral PH.Methods and Materials:Total 120 specimens (65 × 10 × 3 mm3), 40 specimens of each material (Valplast, Meliodent compression moulding and injection moulding) were immersed in denture cleansers having different PH; Valclean (Acidic), Clinsodent (Basic) and Polident (Neutral) as well as Distilled Water. Color changes were measured with a spectrophotometer after 1 month, 3 months and 6 months of immersion cycle. A flexural 3-point bending test was carried out by using an Instron universal testing machine after 6 months of soaking. Data were analyzed using SPSS softwareResults:Maximum effect on colour stability was noted with Clinsodent followed by Valclean. Least color changes were observed after immersion in Polident. Colour difference was increased significantly as the immersion time increased. For both Meliodent and Nylon resins, statistically significant change in flexural strength occurred with immersion in all denture cleansers. Clinsodent has greater effect as compared to Valclean and Polident.Conclusions:Polident and Valclean can be safely used as denture cleanser for both nylon and acrylic resin denture base materials as far as colour stability and flexural strength both are concerned.
Aim:A comparative study for plaque removing efficacy between toothpaste, liquid handwashing soap, and two chemical-soak denture cleansers (clinsodent denture cleansing powder and fittydent denture cleansing tablet).Materials and Methods:A total of 140 healthy complete denture patients were selected and checked for denture cleansing using toothpaste, liquid handwashing soap, and two chemical denture cleansers: Clinsodent powder and fittydent tablets. Cleansing with plain water was kept as control for twenty patients.Results:The data were analyzed using Wilcoxon signed ranks test for checking the efficacy. The Kruskal–Wallis test was used for comparing the plaque removing efficacies of each denture cleanser used in the study. All four denture cleansers were significantly effective in removing plaque when compared with plain water, but there was no significant difference among them.Conclusions:There was no significant difference among action of four denture cleansers used in this study. Thus we can infer that patients can use liquid handwashing soap or commercial products to overcome disadvantages of toothpastes. Recommendation from the results of this study is the use of liquid handwashing soap for cleansing after every meal and soaking of the denture in commercial denture cleanser during the night.
Introduction: The most hidden and inaccessible of all the paranasal air sinuses is the sphenoid sinus, a cavity with an irregular shape that is situated in the middle of the cranial base. Since the anterior cranial base shows little growth after the age of 7, it is regarded as a stable reference for cephalometric analysis. Objective: The aim of this study was to predict skeletal malocclusion by correlating the length of the cranial base and the volume of the sphenoid sinus in different sagittal skeletal patterns.Materials and methodology: In this study, a total of 30 cone beam computed tomography (CBCT) scans of patients, aged between 18 and 35 years who underwent orthodontic and orthognathic treatment were evaluated. DICOM files from the CBCT scans were imported and viewed using Dolphin imaging software. Skeletal malocclusion was evaluated using a lateral cephalogram obtained from the CBCT. Volumetric analysis of the sphenoid sinus and length of the cranial base was evaluated with the help of the Dolphin imaging software. A normality test was done to decide the statistical method for data analysis. A one-way ANOVA with Tukey’s post hoc test was done to compare the three groups. Results: There was a correlation noted between the volume of the sphenoid sinus in skeletal class II malocclusion but no correlation was noted in the length of the cranial base. The mean value of the volume of the sphenoid sinus in subjects with class II skeletal malocclusion was 12613.50± 2023.409 which was greater compared to the other skeletal malocclusions.Conclusion: Sphenoid sinus volume was reported to be increased in subjects with skeletal class II malocclusion but there was no correlation between the cranial base length and sphenoid sinus volume in any group.
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