including valve or air passageway leading from suction area to lingual cavity

Full Title

Dental prostheses; Making same (tooth crowns for capping teeth A61C5/70; dental implants A61C8/00) > Fastening prostheses in the mouth (securing tooth crowns in capping teeth A61C5/30) > Fastening by suction > including valve or air passageway leading from suction area to lingual cavity