18 Flashcards
What material are Orthodontic Bands made of?
Stainless steel
What are the different parts of the molar band? (Label)
- Slot: Wire
- Headgear Tube: Headgear Attachment
- Axillary Tube
- Hook: Should be gingivally placed
- Lingual attachment (not shown)
What are the different parts of the Bracket? (label)
- Meshwork: Increase SA for bonding the cement
- Base: holds everything together
- Slot: Where the wire goes
- Wings: For bands to hold ortho wires in place
- Hooks: For rubber bands for elastic therapy
What material are Orthodontic Brackets made of?
Stainless Steel
Why do we band teeth?
So we can move teeth in certain ways
* ex: Couple
Couple
Produced by putting an equal force on the F & L in opposite directions
* causes a clockwise rotation of the tooth
If the tooth is at an odd angle–>Counter clockwise rotation
Banding Indications
- Heavy forces are planned (ex: going to use Headgear)
- Short clinical crowns
- Rotation control (COUPLE) needed (Rotatio of the tooth is needed)
- Extensive restorations are present(porcelain, gold or amalgam)
What are the 3 major steps for banding?
- Seperate
- Fit on cast then intraorally
- Cement
1st order vs 2nd order vs 3rd order bends
1st order bends:
* faciolingual (in-out) bends
2nd order bends:
* mesiodistal or tip bends
3rd order bends:
* torque bends
Indications for Bonding vs Bonding ALL TEETH
Bonding:
* When orthodontically treating malocclusion
Bonding ALL TEETH:
* Guarding against Decreased oral hygiene
* No need for heavy twisting or shearing forces during treatment (Ex: Headgear treatment)
What are the steps in bonding brackets?
- Remove plaque
- Isolate
- Etch
- Prime
- Place resin on bracket outside of mouth & place bracket on tooth
- Remove Flash (Excess composite)
- Light cure
What is the function of etch?
30-40% Phosphoric acid
* forms microscopic irregularities
* Increase Bonding SA
* create mechanical tags in the enamel (Enamel Tags?)
What is the function of the Primer?
- Increase Bond strength
- Decrease microleage
- Decreaes need for strick moisture control
Boone Guage
Bracket positioning guage
* Proper position of bracket on tooth
* measures the distance from the slot of the bracket to the prescribed vertical height (Non-abraded incisal edge)
Ensures the bracket is placed:
* in the center mesiodistally
* Centrally aligned w/the long axis of the tooth
What is the tooth numbering system in ortho?
Palmar Notation
What is the ideal camera for dental use? Why?
DSLR Cameera (Digital Single Reflex)
Major Advantage: Eliminates Parallax
* bc the view finder, lens, and image sensor have the same optical axis
* What you see in the view finder is identical to what is recorded on the image
What are some factors that influence image quality?
- Magnification
- Inherent object details
- Degree of the Trained Eye
- Visual acuity and acutance
- Psychological perception of detail
- circle of confusion
- Distance of viewing
- Vewing media
What is the ideal magnification? What does it mean?
1:1 magnification=ideal
* tranlsates to above 4 maxillary incisors
* the image recorded by the sensor is the same size as the object in real life
What is the key factor for high resolution images?
High quality lens
Pixels
number of pixels:
* determines the size of a digital image, Not image quality
* is significant when enalarging and image or enlarg. a part of an image. More pixels are required to avoid deterioration of the image quality. For dental Photography=6 MegaPixels
Aperature color
- Colour of a space
- ex: Blue sky
What is the objective measure of sharpness?
Acutence:
* physical measurement of sharpness
* use denlitometer
* Objective, not influenced by subjective
Psychological perception of details
Varies from individual to individual and intra-individual
An individual will see what his/her brain wants to perceive
* might perceive the same image differently at differnt times, depending on state of mind
Lens
Compare the strength, stiffness, and Range for Stainless Steel, TMA, and M-Niti
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