Sales Training 2014 - Dentistry

Chapter 21 Chronology of Teeth Eruption 141

Lower central incisors (71, 81)

71, 81 – 6 to 10 months

71

81

51, 61 – 8 to 12 months 72, 82 – 10 to 16 months

Upper central and lower lateral incisors (51, 61 and 72, 82)

51 61

72

82

52, 62 – 9 to 13 months

Upper lateral incisors (52, 62)

52

62

Upper and lower rst molars (54, 64 and 74, 84)

54, 64, 74, 84 – 13 to 19 months

64

54

74

84

53, 63 – 16 to 22 months 73, 83 – 17 to 23 months

Lower and upper canines (53, 63 and 73, 83)

53

63

83

73

Lower and upper second molars (55, 65 and 75, 85)

55, 65 – 25 to 33 months 75, 85 – 23 to 31 months

55

65

85

75

Figure 21.1  The chronological sequence of eruption of primary teeth. (Teeth in the process of eruption are shaded and erupted teeth are coloured white. Boxes on the left side show the sequence of eruption and boxes on the right side show the age of eruption.)

erupt at around the sixth year of life and are called sixth- year molars . The exchange of dentition usually begins with exfoliation of lower primary central incisors and eruption of lower permanent central incisors. A period of mixed dentition exists when both primary and

SEQUENCE OF PERMANENT TEETH ERUPTION Permanent dentition gradually replaces the primary dentition from around 6 years of age. The beginning of eruption of permanent teeth is marked by the eruption of lower permanent first molars followed by upper permanent first molars. The first permanent molars

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