Background:Conventional investing and casting techniques are time-consuming and usually requires 2–4 h for completion. Accelerated nonstandard, casting techniques have been reported to achieve similar quality results in significantly less time, namely, in 30–40 min. During casting, it is essential to achieve compensation for the shrinkage of solidifying alloy by investment expansion. The metal casting ring restricts the thermal expansion of investment because the thermal expansion of the ring is lesser than that of the investment. The use of casting ring was challenged with the introduction of the ringless technique.Materials and Methods:A total of 40 test samples of nickel chromium (Ni-Cr) cast copings were obtained from the patterns fabricated using inlay casting wax. The 20 wax patterns were invested using metal ring and 20 wax patterns were invested using the ringless investment system. Of both the groups, 10 samples underwent conventional casting, and the other 10 underwent accelerated casting. The patterns were casted using the induction casting technique. All the test samples of cast copings were evaluated for vertical marginal gaps at four points on the die employing a stereo optical microscope.Results:The vertical marginal discrepancy data obtained were tabulated. Mean and standard deviations were obtained. Vertical discrepancies were analyzed using analysis of variance and Tukey honestly significantly different. The data obtained were found to be very highly significant (P < 0.001). Mean vertical gap was the maximum for Group II (53.64 μm) followed by Group IV (47.62 μm), Group I (44.83 μm) and Group III (35.35 μm).Conclusion:The Ni-Cr cast copings fabricated with the conventional casting using ringless investment system showed significantly better marginal fit than that of cast copings fabricated from conventional and accelerated casting with metal ring investment and accelerated casting using ringless investment since those copings had shown the least vertical marginal discrepancies among the four methods evaluated in this study.
In the present study, energy harvesting is done from carbon
fibers (CFs) synthesized using a naturally available
broomstick and bamboo stick. The broom and bamboo sticks have been
reprocessed in an alkaline solution using a controlled hydrothermal
method. The carbonization of the cellulose fibers resulted in the
production of CFs. The synthesized CFs have been used to prepare a
ternary composite electrode with MnO2 and polyaniline
(PA). Thus, prepared ternary composite electrodes were
used for the supercapacitor application. The Supercapacitor with a
maximum specific capacitance (SC) of 373 F/g (from
Broomstick) and 132 F/g (from the bamboo stick) was fabricated,
which showed good cycling stability. The structural properties of
the electrode materials were confirmed using X-ray diffraction,
scanning electron microscopy, EDAX, BET adsorption-desorption
experiment, and Fourier transform infrared spectroscopy techniques.
The fabricated symmetrical electrode's supercapacitor properties
were analyzed using cyclic voltammetry (CV),
electrochemical impedance, and galvanostatic charge-discharge
(GCD) cycling technique.
This clinical report describes a multidisciplinary approach for the oral rehabilitation of a young adult patient diagnosed with hypoplastic amelogenesis imperfecta with a skeletal Class III malocclusion. The specific objectives of this treatment were to eliminate tooth sensitivity while enhancing esthetics and restoring masticatory function. The reverse horizontal overlap of posterior teeth was maintained. Treatment included removal of few teeth, lengthening of the maxillary and mandibular clinical crowns, and placement of anterior and posterior metal-ceramic fixed partial dentures. The third month recall examination revealed no pathology associated with the rehabilitation, and the patient's esthetic and functional expectations were satisfied.
Aim:The aim of this clinical study was to compare the postoperative sensitivity of abutment teeth restored with full coverage restorations retained with either conventional glassionomer cement (GIC) or resin cement.
Materials and methods:Fifty patients received full-coverage restorations on vital abutment teeth. Of these, 25 were cemented with GIC (GC Luting and Lining cement) and the other 25 using an adhesive resin cement (Smartcem 2). A randomized single blind study was undertaken for acquiring and evaluating the data. The teeth were examined before cementation, after cementation, 24 hours postcementation and 7 days postcementation. A visual analog scale was used to help the patient rate hypersensitivity.
Results:The statistical analysis of the result was done using students paired t-test. No statistically significant difference between Smartcem 2 and GIC was observed, when tested immediately and 24 hours after cementation. Statistically significant difference was seen between Smartcem 2 and GIC when tested 7 days postcementation with a significance level of 0.05. Higher postoperative sensitivity was seen with GIC when compared to resin cement.
Conclusion:In this study, the incidence of postoperative hypersensitivity after cementation of full-crown restorations with GIC and resin cement was similar when tested immediately. However, 7 days postcementation, abutments with GIC showed higher response compared to resin cement.Clinical significance: A self-adhesive resin cement can be the material of choice for luting if presence of postoperative sensitivity is of prime consideration. In case GIC is being used, patient should be informed about the presence of sensitivity for a more prolonged period than with resin cement.
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