South Korean Implants: Osstem vs Dentium?

I need three implants and I got two quotations from two dentists: one using Osstem and the other using Dentium? Both manufacturer are from South Korea and their implants seem to be seen as discount ones. Nevertheless, Osstem offer is about 1/3 more expensive than Dentium (per tooth, with a metallo-ceramic crown), which means quite a big deal to me. Are Osstem implants better? If so, I would prefer to spend more now for a better result which, hopefully, I would enjoy for a longer time. Thank you!

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