Dragons Head Coach Paul Turner said: "It is great for the squad that Adam and Wayne will be staying with us. They have both been great servants to the region since their arrival and, over the last two years, have become key members of the squad."
Meanwhile Kevin Morgan, Newport Gwent Dragons' international full back, is set to make a return to regional action in Monday's development match against the Ospreys (Llandarcy 7.15pm).
Morgan, capped 48 times by his country, has been out since last June with a ruptured Achilles tendon and could mark his resumption by coming off the replacements bench.
Dragons new signing Aled Brew will be starting for the region after returning from a successful stint with the Welsh Sevens squad in New Zealand.