Fixed Appiances Flashcards
What are the indications of removable appliance
Tipping
Intrusion or extrusion only
What indications are there for placement of fixed appliances?
Bodily movement
Intrusion/ extrusion
Rotation
Torque
Describe edgewise brackets
Straight slot into brackets
Tooth position dependant on arch wire bends
Describe pre adjusted brackets
Slot pre angulated / pre torqued
Minimal arch wire bends
What can contemporary fixed appliances address?
Bodily movement - space closure , overjet reduction
Rotations
Intrusions/ intrusions - over bite reduction
Up righting- root torquing
What movements do first order bends allow
In / out
What movements do 2nd order bends allow
Tip
What movement do 3rd order bends allow?
Torque
What are the main components to fixed appliances
Brackets Molar bands/ buccal tubes Arch wires Ligatures Auxiliaries
How are brackets adhered to tooth surface
Etched with 37%
Primer- methacrylated phosphoric acid esters
Composite resin sandwich
Unfilled resin adjacent to tooth
Filled resin in middle
Unfolded resin adjacent to bracket base
Describe the three buccal tubes
Upper head gear tube
Middle auxially tube
Arch wire tube
How are bands placed?
Cement - reinforced GI
Compomer
Positioned with Mershon band pusher
Bite stick
What are the materials on offer re. Archwires
Nickel titanium- light and flexible
Stainless steel - less flexible
Beta titanium
Glass/composite
What type of Archwire is used as standard
Nickel titanium- round/ rectangular
Thermally active
What archwire can be used for sliding mechanics
Stainless steel- round /rectangular
Describe the stages of fixed appliance treatment
Anchorage control Alignment/ levelling- nickel titanium Overbite reduction- ss Overjet reduction-ss Space closure -ss Finishing and detailing - nickel titanium
What auxiliaries are there to fixed appliances
Elastic bands
Springs
Palatal/ lingual arches
Headgear
What is elastic traction used for?
Class 2 and 3 corrections
What are temporary anchorage devices used for?
Anchorage
Distal movement
What are the 6 keys to occlusion re. Finished result
Class 1 molars No spaces No rotations Normal angular ion Normal inclination Flat occlusal plane
What equipment is required re. Removal of appliances
Bracket removing forceps
Band removing forceps
What types of retainers are available post tx
Removable- Hawley or pressure formed
Fixed- wire
What problems can occur re. Fixed appliances
Periodontal destruction Demineralisation/ caries Gingivitis Soft tissue trauma Root resporption Pulp death Enamel fracture or tear out during de bond
What emergency situations may arise re. Fixed appliances
Wire pokes
Bracket and band fall off
Elastomerics can be lost or clips open
