HEAD GEARS
INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
DEFINITION Headgear is a device by which extraoral force is almost always applied to the first molars via a face bow and a strap on the head or neck for anchorage
www.indiandentalacademy.com
Uses: 1.Treating skeletal problems in preadolescent children 2.Anchorage 3.Molar distallization www.indiandentalacademy.com
Types of Head gears 1.High pull H.G(parietal) 2.Medium pull H.G(occipital) 3.Low pull H.G(cervical) 4.Combee pull H.G 5.High pull H.G with ‘J” Hooks 6.Medium pull H.G with ‘J’Hooks 7.Low pull H.G with ‘J’ Hooks 8.Reverse pull H.G www.indiandentalacademy.com
Mechanical Principles: 1.F ORCE:It is that which changes or tends to change the position of rest of a body or its uniform motion in a straight line. 2.CENTER OF RESISTANCE:It is that point through which the resultant of the constraining forces acting upon it may be considered to act 3.CENTER OF ROTATION:It is that point around which a body will rotate or tip. www.indiandentalacademy.com
Mechanical Principles (contd). 4.FORCE RESOLUTION:Forces may be resolved into component vectors ,which in a single plane of space, are at right angles to each other. 5.LINE OF ACTION:It is the direction in which the force acts.
www.indiandentalacademy.com
Selection of Headgear: Extrusion of teeth and steepening of O.P-Cervical H.G with outer bow even or low Extrusion of teeth and flatenning of O.P-Cervical H.G with outer bow very high Intrusion of teeth and steepening of O.P-Occipital H.G with outer bow post to C.O.R Intrusion of teeth and flatenning of O.P-Occipital H.G with outer bow ant to C.O.R Distal force and flatenningo of O.P- Combee pull H.G with outerbow above C.R Distal force and steepening of O.P-Combeepull H.G with outer bow below C.R Distal force with no change in O.P-Combeepull H.G with outer bow throu C.R www.indiandentalacademy.com
Duration Of Wear: Non-extraction,full cusp cl-II,good growth increments,forward growth rotation-Full time wear Holding Anchorage-18-20 hrs per day. Precautionary measure- Night use
www.indiandentalacademy.com
Newer method of determining H.G force system: Maj.Steven.L.Cureton-1992jco The direction of force of a H.G at the C.O.R of a tooth or group of teeth can be accurately assessed by projecting a profile slide of the patient over a cephalometric tracing.
www.indiandentalacademy.com
CONCLUSION: A cooperative patient and a clinician prepared to monitor progress and able to redirect the course of treatment at the right moment may successfully treat a wide range of malocclusions with a single headgear approach.
www.indiandentalacademy.com
Thank you www.indiandentalacademy.com Leader in continuing dental education
www.indiandentalacademy.com