A kind of dental handpiece structure,With a head,A turbine room is formed with inside it； One rotor is installed in what turbine room,Rotor has a transmission shaft,And the driving member that is made of plural turbine blade face,And the high pressure gas for entering turbine room can push each turbine blade face to drive rotor to rotate,A notch upward is respectively provided between each adjacent turbine blade face,And a cover cap closes on what turbine room,And what lid what towards between the end face and driving member of turbine room have an annular groove,And annular groove is in be oppositely arranged with each notch,And can be used to collect the high pressure gas through each notch export,And then promote the turning power of dental handpiece.一種牙科手機結構，具有一頭部，其內部形成有一渦輪室；一轉子容設於渦輪室中，轉子具有一傳動軸，及一由複數渦輪葉面組成之傳動件，而進入渦輪室之高壓氣體可推動各渦輪葉面以帶動轉子轉動，各相鄰渦輪葉面間分別具有一朝上缺口，而一蓋體蓋合於渦輪室上，並於蓋體於朝向渦輪室之端面與傳動件之間具有一環槽，且環槽與各缺口呈相對設置，而可用以匯集經各缺口導出之高壓氣體，進而提升牙科手機之車削動力。
