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Index of Orthodontic Treatment
need
(IOTN)
 The Index of Orthodontic Treatment need
(IOTN), described by Brook and Shaw
(1989) and modified by Richmond (1990)
 The index comprises two parts –
(1) DENTAL HEALTH COMPONENT (DHC)
(2) AESTHETICS COMPONENT (AC)
 DENTAL HEALTH COMPONENT (DHC)
records malocclusions in terms of the
significance of tooth irregularities for a personal
dental health
 AESTHETICS COMPONENT(AC)
records the aesthetics impairment , by
implication, the justification for treatment on
socio-psychological grounds
DENTAL HEALTH
COMPONENT (DHC)
 DHC have 5- grade scale , from grade-1
(no need for treatment) up to the grade-5
(great need for treatment)
Only the worst occlusal feature was
recorded
MOCDO
 The Dental Health Component uses an acronym -
MOCDO
 To guide the observer to the single worst feature of the
malocclusion
 MOCDO represents:
 Missing teeth
 Overjets
 Crossbites
 Displacement of contact points
 Overbites
GRADING FOR DHC
GRADES
1 and 2 NO NEED FOR TREATMENT
3 MODERATE/ BORDERLINE NEED
FOR TREATMENT
4 and 5 NEED TREATMENT
AESTHETIC COMPONENT
(AC)
 AC consists of a scale of ten colour
photographs showing different levels of dental
attractiveness
 Both parents and patients find this easy to
apply and there is a high level of agreement
between the scores obtained by dentists,
parents and children
 Grade-1 represents the most and Grade-10
represents the least attractive arrangements of
teeth
GRADING OF AESTHETIC
COMPONENT (AC)
GRADE
1 TO 4 NO NEED FOR TREATMENT
5, 6 AND 7 MODERATE/ BORDERLINE
NEED OF TREATMENT
8,9 AND 10 NEED TREATMENT
QUESTIONS
 M- Missing of 12 (4h)
 O- No increased overjet
 C- No crossbite
 D- No displacement
 O- Slight increased overbite (4mm) (4f)
 M - no missing teeth
O – no increased overjet
C - no cross bite
D - severe displacement of contact
points (upper and lower arch) (4d)
O - overbite (with gingival trauma) (4f)
 M- No missing teeth
 O- No increased overjet
 C- No crossbite
 D- Severe Displacement of contact point
>4mm
 O- Decreased Overbite
 M- No missing teeth
 O- Increased overjet but less than 6mm
(3a)
 C- Anterior and Posterior crossbite >2mm
(4c)
 D- severe contact point displacement>
4mm (4d)
 O- Decreased overbite
 M- No missing tooth
 O – Open bite (>4mm) (4e)
 C- No crossbite
 D- Severe displacement (>4mm) (4d)
 O- Decreased overbite
CDE KPTE IOTN.pptx

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CDE KPTE IOTN.pptx

  • 1.
  • 2. Index of Orthodontic Treatment need (IOTN)  The Index of Orthodontic Treatment need (IOTN), described by Brook and Shaw (1989) and modified by Richmond (1990)  The index comprises two parts – (1) DENTAL HEALTH COMPONENT (DHC) (2) AESTHETICS COMPONENT (AC)
  • 3.  DENTAL HEALTH COMPONENT (DHC) records malocclusions in terms of the significance of tooth irregularities for a personal dental health  AESTHETICS COMPONENT(AC) records the aesthetics impairment , by implication, the justification for treatment on socio-psychological grounds
  • 4. DENTAL HEALTH COMPONENT (DHC)  DHC have 5- grade scale , from grade-1 (no need for treatment) up to the grade-5 (great need for treatment) Only the worst occlusal feature was recorded
  • 5. MOCDO  The Dental Health Component uses an acronym - MOCDO  To guide the observer to the single worst feature of the malocclusion  MOCDO represents:  Missing teeth  Overjets  Crossbites  Displacement of contact points  Overbites
  • 6.
  • 7. GRADING FOR DHC GRADES 1 and 2 NO NEED FOR TREATMENT 3 MODERATE/ BORDERLINE NEED FOR TREATMENT 4 and 5 NEED TREATMENT
  • 8. AESTHETIC COMPONENT (AC)  AC consists of a scale of ten colour photographs showing different levels of dental attractiveness  Both parents and patients find this easy to apply and there is a high level of agreement between the scores obtained by dentists, parents and children  Grade-1 represents the most and Grade-10 represents the least attractive arrangements of teeth
  • 9.
  • 10. GRADING OF AESTHETIC COMPONENT (AC) GRADE 1 TO 4 NO NEED FOR TREATMENT 5, 6 AND 7 MODERATE/ BORDERLINE NEED OF TREATMENT 8,9 AND 10 NEED TREATMENT
  • 12.  M- Missing of 12 (4h)  O- No increased overjet  C- No crossbite  D- No displacement  O- Slight increased overbite (4mm) (4f)
  • 13.  M - no missing teeth O – no increased overjet C - no cross bite D - severe displacement of contact points (upper and lower arch) (4d) O - overbite (with gingival trauma) (4f)
  • 14.  M- No missing teeth  O- No increased overjet  C- No crossbite  D- Severe Displacement of contact point >4mm  O- Decreased Overbite
  • 15.  M- No missing teeth  O- Increased overjet but less than 6mm (3a)  C- Anterior and Posterior crossbite >2mm (4c)  D- severe contact point displacement> 4mm (4d)  O- Decreased overbite
  • 16.  M- No missing tooth  O – Open bite (>4mm) (4e)  C- No crossbite  D- Severe displacement (>4mm) (4d)  O- Decreased overbite