IOTN Flashcards
What does IOTN stand for?
Index for orthodontic treatment need.
What are the two components of IOTN?
Aesthetic component
Dental health component
What is the aesthetic component of the IOTN?
Scale of 10 photographs showing different levels of dental attractiveness.
Grading is made by the orthodontist matching the patient to these photographs.
What is the dental health component of IOTN?
Various occlusal traits of a malocclusion that would increase the morbidity of the dentition and surrounding structures.
5 grades- ranging from 1 to 5.
What do the grade os aesthetic component correlate to?
1-4- no need for treatment
5-7- moderate/borderline need for treatment
8-10- requires ortho treatment.
What is the acronym used to determine the dental component score?
MOCDO
MIssing
Overjets
Crossbites
Displacement of contact points
Overbites
In terms of fixed appliances, what is a transpalatal arch?
Made in 0.9mm HSSW.
Attached to the first permanent molars on both sides.
Used for anchorage, rotations and limited widening or contraction.
What do the dental health components score represent?
1- No need for treatment
2- Negligible need for treatment
3- Borderline need for treatment
4- Dental health problems, requiring treatment
5- Severe dental health problems, requiring treatment
In terms of fixed appliances, what is a palatal arch with a nance button?
Made in 0.9mm HSSW.
Used for anchorage.
In terms of fixed appliances, what is a quad helix?
Made from 0.9mm HSSW.
Attached to first permanent molars.
Uses- Bilateral expansion, asymmetrical expansion, rotation of molars, expansion in cleft palate, assist with habit breaking.
What are the advantages of fixed appliances?
Bodily tooth movement.
Rotations easily fixed.
Individual force can be applied to every tooth.
Not easily removed by the patient.
Works 24 hours a day, 7 days a week.
Less invasive of tongue space.
Minimal palatal coverage
What are the disadvantages of fixed appliances?
Increased risk of root resorption
Decalcification
Visually unattractive
Soft tissue trauma
Cost
High motivation required for real hygiene
Poor anchorage
Destructive- etching
What are the advantages of a thermoplastic retainer?
Cheap
Easily made
Easily replaced
Aesthetically better than conventional retainers
Easily tolerated by the patient
Not destructive to the tooth
What are the disadvantages of a thermoplastic retainer?
Patient cannot eat with it in
Can easily not wear it
Break easily/lost
May enhance poor OH- plaque retentive factor.
Patient may abuse it- bleaching trays
What are the advantages of bonded retainers?
Fixed in place
Can’t see it- aesthetic
