| 摘要 |
FIELD: medicine; dentistry. ^ SUBSTANCE: dental tool can be used for mechanical treatment of tooth's neck. Dental tool has swivel work head, bur with working tip and axis, which bur is fixed in swivel work head. Limiter is introduced into tool additionally; limiter is made in form of cone-shaped member and it is provided with restricting protrusion, first and second support protrusions, recess and channel for supplying cooling liquid. There is deepening between first and second support protrusions. Channel for supplying cooling liquid comes to deepening; working tip is disposed inside channel to have gap for provision of ability of tip's rotation. Limiting protrusion is disposed at external side of working end and it is made in form of smoothed step. Axis goes through mentioned recess. First support protrusion has rounded shaped. ^ EFFECT: reduced traumatism of gums; improved precision of treatment. ^ 3 dwg |
