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Index of Orthodontic Treatment Need modified for use in Epidemiological Surveys : Modified IOTN 1.

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Presentation on theme: "Index of Orthodontic Treatment Need modified for use in Epidemiological Surveys : Modified IOTN 1."— Presentation transcript:

1 Index of Orthodontic Treatment Need modified for use in Epidemiological Surveys : Modified IOTN 1

2 Written by Donald Burden and Cynthia Pine with assistance from the BASCD Working Party on Orthodontics 2

3 Modified IOTN consists of two components: 1. Aesthetic Component 2. Dental Health Component 3

4 Aesthetic Component Grades 1-7 No Definite Need for treatment Grades 8-10 Definite Need for treatment 4

5 5

6 Recording the Aesthetic Component Ask subject to close on their back teeth Retract lips Grade the dental attractiveness of the anterior teeth 6

7 Recording the Aesthetic Component The grade awarded is for overall dental attractiveness rather than specific morphological similarity to the photographs First impressions are usually correct Main aim is to differentiate those at

8 Dental Health Component IOTN has been simplified to two categories: Definite Need for Treatment No Definite Need for Treatment The subject is examined for specific conditions and if one is found, a Definite Need for Treatment is recorded and no further conditions are sought. 8

9 Recording the DHC Examine each subject for: Missing teeth Overjets Crossbites Displacement of contact points Overbites = MOCDO 9

10 Recording the DHC Examine the subject using the MOCDO scale As soon as a definite treatment need threshold is reached, then the examination is stopped 10

11 MOCDO Missing teeth Overjets Crossbites Displacement of contact points Overbites 11

12 Missing Teeth (teeth not visible) Congenital absence/traumatic loss Ectopic teeth Impacted teeth 12

13 Missing Teeth Palatally ectopic canines Is the canine palpable in the buccal sulcus? If not, it is ectopic = Need for Treatment 13

14 Missing Teeth IMPACTED if 4mm or less space is available between adjacent teeth Impacted = Need for Treatment 14

15 15

16 Missing Teeth (Congenital absence/traumatic loss) In your opinion, is orthodontic treatment required to open or close the space? If yes = Need for Treatment 16

17 MOCDO Missing teeth Overjets Crossbites Displacement of contact points Overbites Original Slide No.15 17

18 Measuring Overjets Increased overjets (Class II) and reverse overjets (Class III) are measured using the metal ruler 18

19 Positive overjets Second line (red) – 6mm 19

20 20

21 Measuring Overjets Measure to the labial aspect of the most prominent incisor Only record Need for Treatment if the overjet extends beyond the 6mm line 21

22 22

23 23

24 Measuring Reverse Overjets All four incisors must be in lingual occlusion 24

25 Measuring Reverse Overjets If the reverse overjet falls exactly on the 4mm (white line) record in the Definite Need for Treatment category 25

26 First line (white) – 4mm Crowding Reverse overjets Open bites 26

27 27

28 MOCDO Missing teeth Overjets Crossbites Displacement of contact points Overbites 28

29 Crossbites Can be anterior or posterior, but mostly posterior. Check for displacement on closure. If displacement on closure = Need for Treatment 29

30 MOCDO Missing teeth Overjets Crossbites Displacement of contact points (crowding) Overbites 30

31 Crowding Only applies to crowding between permanent teeth Measure between the contact points of the two most crowded teeth 31

32 First line (white) – 4mm Crowding Reverse overjets Open bites 32

33 33

34 MOCDO Missing teeth Overjets Crossbites Displacement of contact points Overbites 34

35 Overbite Deep overbite Open bite 35

36 Deep Overbite Deep overbite causing gingival or palatal traumatic injury = Definite Need for Treatment 36

37 37

38 Other Points of the Modified IOTN Generalised spacing is not recorded in the Dental Health Component 38


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