What pliers are used commonly in an orthodontics lab?
- adams 64 pliers
- wire cutters
what does ARAB stand for?
- active component
- retentive
- anchorage
- baseplate
what are the active components of a design?
the name of the component/components that will be moving teeth with the application of force
what does retentive mean in the appliance design?
the resistance to displacement forces
what does anchorage stand for in the appliance design?
the resistance to unwanted tooth movement
what does baseplate refer to in the design of an ortho appliance?
connects all the components together as a unit, provides anchorage & assists with retention
How do teeth move in orthodontics?
if prolonged force is applied to a tooth, the tooth will move
what does the force exerted on a tooth cause other than movement?
creates pressure that causes the bone around the tooth to remodel
- bone is selectively removed in some areas & added in others
what is the remodelling of bone controlled by?
by the PDL fibres
what are the components of stainless steel?
Iron
Chromium
Nickel
Titanium
Carbon
what % of Iron is found in stainless steel?
72%
what % of Chromium is found in stainless steel?
18%
what % of Nickel is found in stainless steel?
8%
what % of Titanium is found in stainless steel?
1.7%
what % of Carbon is found in stainless steel?
0.3%
what are some advantages of removable orthodontics?
- excellent anchorage
- cheaper than fixed ortho
- shorter chair side time
- oral hygiene easier to maintain
- non-destructive to tooth surface
what are some disadvantages of removable orthodontics?
- less precise control of tooth movement
- easily removed from patient
- only 1-2 teeth moved at a time
- rotations very difficult to correct
what gauge of stainless steel wire is used for Adam’s clasps?
0.7mm
what gauge of stainless steel wire is used in CHILDRENS Adams clasps?
0.6mm
what are the different uses of casts in orthodontics?
- motivation for patient
- design appliances
- form of record
- teaching
- able to see changes in occlusion
- patient explanation
what patient information should be given when a removable appliance is used in treatment?
- appliance may feel big & bulky
- may cause initial excessive salivation
- may impinge speech
- may cause initial discomfort or ache
what patient instructions should be given when a removable appliance is used in treatment?
- must be worn 24/7
- remove after every meal & clean with soft brush
- remove & store in protective container when playing contact/active sports
- avoid hard/sticky foods that may damage the appliance
- missing appts will significantly lengthen treatment time
what gauge of wire is used for active components such as springs?
0.5mm hard stainless steel
what gauge of wire is used for retentive components?
0.7mm hard stainless steel
