Q. Bone needed for dental implants comes from cadavers. Is this permitted?

A. We should answer for the above Shaila. first three different questions.

1) It is forbidden to derive benefit from a dead body.

A. Most poskim assume that this is a biblical prohibition. (Tosafos and Rashba Babba Kama 10a, Ramban Vayikra 11:3, Rashba Teshuvos 1:364, and Lechem Mishna 14:21)
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However, the Mishna Lemelech Avel 14:21 (1) suggests that perhaps the Rambam Maachalot Asurot 2:3 holds it is only a rabbinic prohibition.

Rabbi A. Bartfeld as revised by Horav Dovid Pam, Horav Aharon Miller, Horav Chanoch Ehrentreu Shlit’a and Horav Kalman Ochs Shlit’a.