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Comparison of Flexural Strength of Cobalt-Chromium Dental Alloy Fabricated and Soldered by Different Techniques
Aim: Non-noble metal alloys are the most commonly used metal alloys in removable and fixed prosthetic restorations. Cobalt-chromium (Co-Cr) alloys are often preferred due to cheapness, availability, and sufficient strength. The aim of this study is to determine the flexural strengths of Co-Cr infrastructures produced by different methods after gas or laser soldering. Materials-methods: Co-Cr metal infrastructures were fabricated with conventional casting technique, laser sintering, and computer-aided design and computer aided manufacturing (CAD/CAM) methods. Twenty-four samples (2x4x25cm) were produced made for each group. Eight of the samples from each group consisted of control samples (non-soldered), eight of them were soldered by gas soldering, and eight of them were laser soldered. Flexural strength of all samples was measured. Results: Flexural strengths in non-soldered samples were measured evaluated, and the higher results were found in the laser sintering, CAD/CAM and conventional casting groups, respectively. The highest flexural strength in casted samples was obtained in the laser soldered samples. The highest flexural strength of the samples produced by laser sintering and CAD/CAM were obtained in non-soldered samples. Gas soldering procedure reduced flexural strength in all samples, and the maximum reduction was found in the samples produced by laser sintering. Laser soldering increased the flexural strength in casted samples while decreasing the strength of laser sintered and CAD/CAM samples. Conclusions: The physical properties of the metal alloys after the soldering process may vary depending on the production method of the metal to be soldered. Particularly, the non-soldered samples have higher flexural strength than the soldered samples, especially since laser sintering provides a more intensive metal infrastructure production. Flexural strengths of all samples soldered, except for samples produced by conventional casting and laser-soldered were found to be lower than those without soldered. Gas soldering decreased flexural strength of the Co-Cr alloys more than laser soldering.