You can clearly see that. The 2016 JDA is not worthington by reading Worthington description in 2015 10k below Furthermore, per yesterday's PR, Sintx is working with more than 1 global dental company, which Worthington is not.
The Company is developing ceramic implants in projects funded by global dental companies, and, expects to announce a partnership with one or more such parties by year-end.
This suggests they have a JDA with a global dental company, which I believe to be Zimmer, and are still working with Dentsply.
2016 10k
We have entered into a joint development agreement with a dental implant design company and distributor of dental technologies for the development of a silicon nitride based dental implant system and devices.
2015 10k
We have entered into a joint development agreement with Worthington to provide access to our silicon nitride technology platform to develop, prototype and manufacture the patented Worthington dental implant system. Pursuant to the terms of the agreement, we are assisting Worthington in the development and commercialization of the Worthington dental implant system and devices.