Assessment of the impact strength of the denture base resin polymerized by various processing techniques

Aim : To measure the impact strength of denture base resins polymerized using short and long curing cycles by water bath, pressure cooker and microwave techniques. Materials and Methods: For impact strength testing, 60 samples were made. The sample dimensions were 60 mm × 12 mm × 3 mm, as standardized by the American Standards for Testing and Materials (ASTM). A digital caliper was used to locate the midpoint of sample. The impact strength was measured in IZOD type of impact tester using CEAST Impact tester. The pendulum struck the sample and it broke. The energy required to break the sample was measured in Joules. Data were analyzed using Student′s " t" test. Results: There was statistically significant difference in the impact strength of denture base resins polymerized by long curing cycle and short curing cycle in each technique, with the long curing processing being the best. Conclusion: The polymerization technique plays an important role in the influence of impact strength in the denture base resin. This research demonstrates that the denture base resin polymerized by microwave processing technique possessed the highest impact strength

Aesthetic rehabilitation of a dental fluorosis case with porcelain laminate veneers

Fluorosis is a crippling disease and an ongoing challenge for India. It is a public health problem caused by excess intake of fluoride through drinking water, food products and industrial pollutants over a long period of time. Ingestion of excess fluoride, most commonly in drinking-water affects the teeth and bones. Repeated exposure to high concentrations of fluoride during tooth development, leading to enamel with reduced mineral content and increased porosity. Selection of appropriate treatment plan depends upon the severity of fluorosis. Porcelain laminate veneers are considered the treatment of choice for moderate to severe cases of fluorosis given the optimum aesthetics, wear resistance, biocompatibility, and long-term results of these veneers. This case report describes a step-by-step rehabilitation of dental fluorosis, using porcelain laminate veneers in a 28-year-old Indian female

Analytical Quality check of oil based blend in Flaxilip capsule

ABSTRACT Analysis of capsules containing blend in the powder form is easy, but it is bit difficult to analyse the soft gelatin capsule containing oil based blend. The purpose of this study was to develop test parameters to determine and supervise the quality of such herbal capsule formulation. Five different lots of soft gelatin Flaxilip capsule containing Linseed oil, Guggulu processed with linseed oil, Garlic oil, Fenugreek oil along with Soyabean oil as an excipient , were selected for the study. All the five lots were subjected to general capsule tests such as determination of average weight and disintegration time. Results obtained were around 1.3500g and 10minutes respectively. Specific test parameters applicable for oils like specific gravity, refractive index, acid value, peroxide value, saponification value, iodine value were applied quantitatively for quality evaluation. Standardised suitable classical methods were applied. Results in all the five lots were found to be well within inhouse limit. All the samples were subjected to heavy metals and microbiological testing. Compliance of corresponding findings with the standard pharmacopoeial guidelines assure the safe intake of the drug. For getting the better effect, the Guggulu that is Commiphora mukul used in the formulation was processed with linseed oil. Its presence was confirmed by carrying out HPTLC for E and Z guggulu sterone. Resemblance of spots at Rf ranging from 0.36 to 0.38 and 0.43 to 0.45 in Toluene : Acetone (9:1) system showed the presence of gugulu in blends of all the lots. Hence by applying all these test parameters one can ensure the quality of the soft gelatin ayurvedic capsule formulation containing oily base like in Flaxilip capsule

Evaluation of three different long-term addition polymerising silicone denture liners and to compare the changes in their hardness, modulus of elasticity and water sorption after storage in artificial saliva

Aim: To evaluate the properties of three different long-term addition polymerising silicone denture liners in relevant clinical situations. Materials and Methods: Three silicone-based, widely used soft denture liners (autopolymersing chair-side GC RelineTM Soft and Mollosil® and heat cure Molloplast® B) were selected. Forty-two disk-shaped samples were prepared using a heat-polymerised PMMA denture base material using a stainless steel split mould (40mm diameter, 8mm thickness). All three long-term silicone-based soft liners were mixed, and 3mm were poured over the specimens. The samples were stored in artificial saliva for 24 hours at 37 degrees Celsius, and initial measurements were taken for hardness, water sorption and modulus of elasticity. A Shore A durometer measured the hardness, water sorption with precision balance and modulus of elasticity with a universal testing machine. Statistical Analysis: Statistical constants such as mean and standard deviations (SD) were calculated. One-way ANOVA was done using Tukey's multiple comparison test to compare hardness, modulus of elasticity, sorption of three different addition polymerising soft liner after storage in artificial saliva checked at different time intervals

Silver nanoparticles: a new perspective in endodntic therapy

Silver has been in use in medicine since time immemorial because of its antimicrobial properties. But due to the emergence of antibiotics the use of silver has been declined. Several pathogenic bacteria have developed resistance against various antibiotics. This has led to reemergence of silver. Recently nano science and nanotechnology are gaining tremendous popularity. The small size of nanoparticles provides larger surface area and hence increases the effectiveness of nanoparticles. Silver nanoparticles are used in medical and dental applications ranging from silver based wound dressings, silver coated medicinal devices like catheters, endotrachial tubes, bone cements, in gels, lotions, cosmetics, in dental restorative materials, endodontic cements, dental implants caries inhibitory agents and in prosthesis. The purpose of this article is to discuss briefly the potential role of silver nano particles in endodontic therapy

Laser functionalization: An emerging modality to enhance the osseointegration potential of polyetheretherketone as a dental implant material

The unique physical and mechanical attributes of polyetheretherketone (PEEK) have lent significant momentum to the motion that PEEK can be used as a material of choice for dental implants. However, in contrast to titanium or zirconia, PEEK has very limited inherent osteoconductive properties. A wide variety of research has been conducted till date to improve the bioactivity of PEEK surface. Varied methods have been proposed, laser surface treatment of PEEK being one of the promising techniques. Data collection was limited to the last 10 years from 2012 to 2021. Eleven articles were found suitable for this review found in the databases of PubMed and Google Scholar. Considerable alterations have been observed in surface roughness and wettability characteristics of PEEK after laser surface treatment, which improved the osseointegration property of PEEK to be utilized as a dental implant material. The current paper is aimed at reviewing different types of laser applications to the PEEK surfaces and its effect on bone-to-PEEK implant contact