Presentation on theme: "THE PRINCIPAL MODE OF ACTION OF FUNCTIONAL APPLIANCE"— Presentation transcript:
1THE PRINCIPAL MODE OF ACTION OF FUNCTIONAL APPLIANCE AHMAD HAMZI HAMI MUHAMADSYAFIQAH NADHIRAH ISKANDARABDULLAH ZAHID AZHARIAKMAL KHALIS DOREYATIDHAM HAFIZE SUPIAWATIF ASRI
2Basis of its work:The grows of the mandible is guided (particularly in the anterior and vertical directions) but the grows of the maxilla is also affected.
3MOA of FADENTOALVEOLAR EFFECTSKELETAL EFFECTSOFT TISSUE EFFECT
4DENTOALVEOLAR EFFECT (COMPENSATION) Under the influence of favourable soft tissues,Class II malocclusionsThe lower incisors may be proclined and the upper retroclinedClass III malocclusionsThe upper incisors may be proclined and the lowers retroclinedThese dentoalveolar compensation is to compensate for the sagittal skeletal discrepancy.Dentoalveolar compensation is a static snapshot of occlusal adaptation, produced by favourable soft tissue, which masks the severity of an underlying discrepancy either in anteroposterior, vertical or transverse dimension.
5Vertical relationship DENTOALVEOLAR EFFECT(VERTICAL RELATIONSHIP)In case of skeletal open biteTo maintain the normal overbite, the posterior dentoalveolar segment intrudes. The anterior dentoalveolar segments extrudes.In case of skeletal deep biteThe posteriors can extrude or the anteriors can intrude to maintain a normal overbite.
6Transverse relationship DENTOALVEOLAR EFFECT (TRANSVERSE RELATIONSHIP)A discrepancy between a narrow maxillary base and a wide mandibular basebuccal tilting of upper teeth and lingual tilting of lower teeth.A discrepancy between wide maxillary base and narrow mandibular baselingual tilting of upper teeth and buccal tilting of lower teeth.
7SKELETAL EFFECTThe skeletal changes can be considered in two dimensions, namely anteroposterior and vertical.Increased mandibular length.- due to downward and forward translation of the condyle which may encourage backward compensatory growth.- a change in the position and direction of the mandibular condyle and glenoid fossae (forward remodelling of the glenoid fossa- secondary to anterior condylar repositioning).- accelerated growth of the mandible, but not necessarily additional growth.Restraint of maxillary grows.-due to the Class II traction forces acting on maxilla. Incorporation of headgear into functional appliance treatment increases this effect.
8SOFT TISSUE EFFECTSome functional appliances have the long-term effect on the soft tissues.Functional regulator appliances in combination with lip exercises might influence the position and functions of lips and cheeks to move the teeth into correct position.