Appliance info you won't enjoy Flashcards
Terminology and THE ACTIVE PLATE
Functions of Functional Appliances?
Correction of malocclusion:
- Tooth borne
- Tissue borne
(the components used and where they are placed will influence the change)
Generally, functional appliances (FA) are ________
Removable
Are there any FA’s which are fixed appliances?
Yes, the twin block. We don’t really focus on that in this syllabus but if you have time, find a picture on it because it’s a good way of explaining component functionality etc…
Types of Removable Appliances
Passive or Active
P - Force on teeth to facilitate movement
A - Minimal force, more for holding teeth in place (allows for other components to act on what they need to without tooth involvement)
What type of Fixed Appliances are there?
The traditional bracket
Modern lingual bracket
How are aligners different?
Aligners like Smile Direct etc have pre-requisites for the changes to be effective. They’re also removable which means if the pt is not compliant, the effects will be reduced or require more time.
What are Arch Appliances?
Arch wiring
Focus points will be E-Arch (straight wire tech) and Ribbon Arch (edgwise tech)
(so basically an arch is either the entire upper jaw or the entire lower jaw)
Which component of the (FA)’s actively corrects size and shape of dental arches? Does it have the ability to reposition individual teeth and occlusal relationship?
The Active Plate
Yes, it may - under certain conditions.
Which impressions must we take accurately to design the active plate?
Max and Man All the Frenulums Alveolar bone Palate Vestibular area Sublingual area
- a good impression yields a tight and precise fit
What are the 4 key components in designing the AP
- Acrylic Base Plate
- Wire Component
- Supplemental Elements
- Expansion Elements
1) Functions of the base plate?
Integrates both the active and retentive elements of the AP
As the name suggests, it is the foundation block
Key characteristics
Borders fit tightly to the surfaces of teeth
In the Max, the plate extends to the occlusal surface of the molars. We want to create undercuts of the Pre’s and Canines
In the Man, the plate is the same only difference is we want to keep it 4mm above the cervical area of the tooth.
In the Anterior region, avoid tissue trauma by placing it 2mm above interdental papilla.
How it’s made
PMMA
Cold cure/ light cure
2) Let’s talk wiring. What can they be divided into?
Passive or Active
Passive - function is to engage the undercuts in Proximal/Interdental area
Active - functions are to move teeth in oral direction (tipping), retention and support
Name the passive elements:
Clasps, Pads/Caps and Labial Bow
Schwarz Clasps (Versatile - even used in space maintainers) Adams Clasps (incl. retentive loops) Circumferential Clasps (For mandibular AP)
All of these engage the undercuts in proximal/interdental region in posterior teeth
Note: The labial bow is both a retentive and active component. W/out springs it isn’t active
