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Eruption and Occlusion of the Permanent Dentition Mark H. Taylor, D.D.S., F.A.C.D.

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Presentation on theme: "Eruption and Occlusion of the Permanent Dentition Mark H. Taylor, D.D.S., F.A.C.D."— Presentation transcript:

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2 Eruption and Occlusion of the Permanent Dentition Mark H. Taylor, D.D.S., F.A.C.D.

3 Dont Fake Knowledge! Know Nolla's stages of calcification Know time of eruption of permanent teeth

4 Nolla's 10 Stages of Calcification Stage 2 - initial calcification Stage 6 - eruptive movement begins (crown formation complete) Stage 8 - alveolar crest pierced (2/3 root development) Stage 9 - gingival margin pierced (3/4 root development) Interval between Stage 6 and full interdigitation is about 5 years

5 Time of Eruption (Years)

6 Why Know Calcification Times? Enamel hypoplasia

7 Fluorosis

8 Fluorosis and Hypoplasia

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10 Factors Affecting Eruption Genetics - sequence & timing mostly genetically controlled Nutrition Premature loss of a primary tooth Eruption… heh heh… get it?

11 Eruption Facts Girls 5 months faster than boys and most common in maxilla (6-1) and (6-1) most common in mandible

12 Mesial Drift and Anterior Component of Force Mesial drift Ectopic eruption Axial inclination produces mesial force Space maintenance

13 Ectopic Eruption

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20 Space Maintenance - PHA

21 Space Maintenance - LLHA

22 Space Maintenance - BLS

23 Space Maintenance - Distal Shoe

24 Crossbites Unilateral vs. bilateral Dental vs. skeletal Appliance types

25 Functional Cross Bite

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29 Quad Helix Appliance

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31 Distalizing Appliance

32 Absence of Permanent Teeth 4-6% congenital absence Females more frequently missing teeth Most common congenitally absent teeth: –mandibular 2nd premolar –maxillary lateral incisor –maxillary 2nd premolar

33 ?????????????

34 ??????????????

35 Missing Permanent Teeth

36 Extra Permanent Teeth Supernumerary teeth found most frequently in the maxillary incisor region (mesiodens), and occasionally in the premolar area 2-3% supernumerary teeth, males more common

37 Supernumerary Teeth

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41 Supernumerary Permanent Tooth

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44 Changes in Arch Width Intercanine and intermolar growth –significant increases between 6 weeks and 2 years of age –significant increases between 3 and 13 years –mandibular intercanine width established by 8 years of age –after permanent teeth erupted, slight decrease in arch width in the intercanine area Bishara, et al; Arch width changes from 6 weeks to 45 years of age AJO, April 1997

45 Changes in Arch Length and Overbite Arch length decreases* –late mesial shift, mesial drift, interproximal wear –do not affect interach relationships Overbite –decreases in primary dentition –increases in mixed dentition –OB/OJ relatively stable in adult* *Harris, A longitudinal study or arch size and form in untreated adults AJO, April (20-55 yoa)

46 Intercanine Growth

47 Angle Classification Class I Molar (65%) Class II Molar (30%) Class III Molar ( 5%)

48 Class I Molar Distal Mesial

49 Class II Molar Distal Mesial

50 Class III Molar Distal Mesial

51 Cuspid Classification Neutro (Class I) Disto (Class II) Mesio (Class III)

52 Neutro Cuspid (Class I) Distal Mesial

53 Disto Cuspid (Class II) Distal Mesial

54 Mesio Cuspid (Class III) Distal Mesial

55 Divisions of Class II Division I - excess OJ Division II - "rabbited" incisors Subdivision - one side

56 Divisions of Class II Division 1

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59 Divisions of Class II Division 2

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63 Six Keys to Occlusion Class I molar relationship Mesial crown angulation Proper crown inclination No rotations Tight contacts Flat occlusal plane

64 Types of Faces Brachycephalic - broad & short Dolichocephalic - long & narrow Mesocephalic - normal

65 Brachycephalic

66 Dolichocephalic

67 Mesocephalic For the ladies…. For the gentlemen...

68 Mesocephalic For the moviegoer….

69 Mesocephalic For the intellectual dental student….

70 You Tell Me.

71 Profile?

72 Overbite - Overjet?

73 Occlusion?

74 Huskers!!!!


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