Methods and systems herein relate to receiving dentition data of a patient； processing the dentition data in a server to determine a vertical displacement and a forward mandibular position to enable the patient to breathe during sleep by opening the airway of the patient； and forming a homogeneous dental appliance via direct manufacture using the processed dentition data, the vertical displacement and the forward mandibular position, the dental appliance including a lower dental tray and an upper dental tray, the lower dental tray inclusive of a pair of vertical displacement bite pads with the vertical displacement and a first pair of button protrusions, the upper dental tray inclusive of a second pair of button protrusions, the first pair of button protrusions and the second pair of button protrusions providing the forward mandibular position when two elastic bands are attached to connect the upper dental tray and the lower dental tray.
