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21 Cards in this Set
- Front
- Back
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Three Factors allow jaws to accommodate 2 sets of teeth
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1. chronological control of deciduous
2. permanent crowns are forming while deciduous teeth are being lost 3. 5-6 yr time lag btw developmental sequence and emergence of permanent molars |
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Order of Appearance of Deciduous
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I1, I2, dM1, C, dM2
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The first deciduous molar is
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an anchor for posterior teeth
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Roots of deciduous teeth complete...
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12-15 months after occlusion
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Takes ___ years to completely form (root apex)
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2-2.5
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Use Phase of deciduous teeth is
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3-4 years
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First tooth to form is
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the first permanent molar
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M1
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-first tooth to form
-M1 forms in utero -M1 mineralizes @5 months -M1 completes @ age 2.5 -M1 shows @ 6 yrs |
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M2
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-begins mineralization .5-1 yr
- completes crown @ 7 yrs |
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M3
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-mineralizes @ 7-13 yrs
-appears @ 18 yrs |
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M1-M3 Root apex completion totals about
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12 yrs
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It takes ___ yrs after the crown shows for the root to complete
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2-3
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_____ are the 1st permanent teeth to NOT be lingual
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premolars - develop in roots of deciduous dM1 and dM2
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Period of Mixed Dentition
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6-13 yrs old
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Change in dentition initiates @
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6 yrs. w/ M1
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3 Waves of Emergence for Permanent Teeth
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6-7 yrs: M1, I1, I2
10-12 yrs: C, PM1, PM2, M2 17-20 yrs: M3 Mandibular before Maxillary |
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____ form arch and face
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M1 and C
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Shedding of Deciduous Teeth
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1. spaces form btw deciduous tooth roots
2. deciduous teeth begin to drift apart |
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Deciduous tooth loss is mediated by
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root absorption
-osteoclasts dissolve roots of deciduous teeth |
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Agenesis
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failure to have a formed secondary/permanent tooth
-mand PM2 most common -2nd max. lateral incisor |
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Most unstable tooth
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Maxillary Lateral Incisor
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