{HEAD ~ The vertical alveolar osteogenesis microdistractor device} 8 wherein the chamber of {TAIL ~ the fixed bracket} is a bottomed chamber 
{ HEAD ~ The vertical alveolar osteogenesis microdistractor device } 8 wherein the chamber of { TAIL ~ the fixed bracket } is a bottomed chamber
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH