This study compared the surface topography, hydrophilicity, and bioactivity of titanium implants after 3 different surface treatments (sandblasting and acid etching, modified sandblasting and acid etching, and thermal oxidation) with those of machined implants. One hundred indigenously manufactured threaded titanium implants were subjected to 3 methods of surface treatment. The surface roughness of the nontreated (Group A) and treated samples (Groups B through D) was evaluated with a scanning electron microscope (SEM) and profilometer. The wettability was visually examined using a colored dye solution. The calcium ions attached to the implant surface after immersing in simulated body fluid (SBF) were assessed on days 1, 2, and 7 with an atomic electron spectroscope. The data were analyzed statistically. The SBF test allowed the precipitation of a calcium phosphate layer on all surface-treated samples, as evidenced in the SEM analysis. A significantly higher amount of calcium ions and increased wettability were achieved in the thermally oxidized samples. The mean roughness was significantly lower in Group A (0.85 ± 0.07) compared to Group B (1.35 ± 0.17), Group C (1.40 ± 0.14), and Group D (1.36 ± 0.18). The observations from this in vitro study indicated that surface treatment of titanium improved the bioactivity. Moreover, results identified the implants that were sandblasted, acid etched, and then oxidized attracted more calcium ions.
Aim: The aim of this in vitro study was to compare the flexural strength, the flexural modulus and compressive strength of the acrylic polymer reinforced with glass, carbon, polyethylene and Kevlar fibres with that of plain unfilled resin.
The restoration of edentulism through cast partial denture is one of the important goals of prosthodontics. The caries destruction of an abutment tooth supporting a Cast Partial Denture (CPD) is commonly associated with the loss of retention of the prosthesis, making it non-functional. Even though the literature discusses many techniques for the prosthodontic restoration of destructed abutment tooth supporting a CPD, none of them explains a simple method which incorporates the retentive features as well as aesthetics on the definitive restoration. This article discusses an innovative yet simple technique for the fabrication of a provisional crown as well as a definitive porcelain fused to metal restoration, which can maintain the aesthetics and retentive features of the abutment. This technique enables the patient to continue wearing the existing prosthesis.
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