370 likes | 453 Views
Learn about the components and applications of removable orthodontic appliances used for correcting various orthodontic defects, such as open bite, crossbite, rotation of teeth, and crowding. Explore the composition of these appliances, including clasps, springs, and labial bows, and the process of acrylic application for creating customized appliances. Get insights into the fabrication techniques and steps involved in producing functional orthodontic devices.
E N D
Removable orthodontic appliances Kristýna dandová
Removable orthodontic appliances Usedforcorrectionofdifferentorthodonticdefects • Defectsof bite - open bite - crossbite - under bite • Defectsofindividualteeth - rotation - protrusion, retrusion -crowding
Removabe orthodontic appliances are composed of acrylic body and clasps • The clasps are twisted of wire by special pliers (bird beak, cutter)
The double helical spring • Made of 0.5 mm wire • Double helical spring is maximizing the elasticity of the protrusion spring
The double helical spring ( Z-spring) is usualy used on rotated incisors • The spring is located on the tooth neck • The right sided and left sided z springsare fabricated accordingly
The Adams clasp • 0,7 mm stainless steel wire • Adams clasp is used as anchorage of the appliance • Usualy situated on molars
The ball clasps • 0,7 mm wire • Used as anchorage of the removable appliances • Situated on incisors orin between premolars
The labial bow • Made of 0,7 mm wire • Used for harmonic alignment of the anterior segment
Thelabialbowissituatediscomposedofthreeparts: • Horizontalbowportion • „U“ loops • Retentivearms Thebowissituatedbetweenthecanines
Before the application of acrylic models have to be put into the water isolation
Application of acrylic • After choosing of the color we can start with application of acrylic • We change application of powder and liquid untill we have appropriate shape of the appliance
Orange liquid Red liquid Acrylic powder
The poymerization proceeds in the polymerization unit (10 min,55°C, 3-3,5 bar)
Instrumentstoproduce an orthodonticappliance Separating disc rubber