Deciduous dentition

Eruption of the Teeth

The movement of a developing tooth toward the occlusal plane until it emerges through the gingiva and becomes visible in the oral cavity. //

Deciduous Dentition

The first set of teeth; also called primary, temporary, milk, baby, or juvenile teeth. It consists of 20 teeth and normally erupts from approximately 6 to 30 months of postnatal life. By about 2–2½ years of age, all deciduous teeth are expected to be in use. //

Deciduous Dentition — Number of Teeth

20 teeth: 10 in the maxillary arch and 10 in the mandibular arch. //

Deciduous Dentition — Classes of Teeth

Central incisors, lateral incisors, canines, first molars, and second molars. //

Deciduous Dentition — General Eruption Range

All deciduous teeth erupt approximately from 6 to 30 months of postnatal life. //

Deciduous Dentition — Usual Order of Appearance

Central incisors → lateral incisors → first molars → canines → second molars. //

Deciduous Dentition — Eruption Timing

Timing of eruption is largely influenced by heredity and sometimes by environmental factors. //

Deciduous Dentition — Maxillary vs Mandibular Eruption

According to Lunt and Law, lateral incisors, first molars, and canines tend to erupt earlier in the maxilla. //

Deciduous Dentition — Physiological Spacing

At approximately 5 years of age, jaw growth produces separation or spacing of the deciduous teeth; this is called physiological or developmental spacing. //

Deciduous Dentition — Premature Loss

Premature loss of deciduous teeth may cause loss of arch length and consequently increase the tendency for crowding of permanent teeth. //

Deciduous Dentition — Factors Associated with Abnormal Occlusion

Premature loss, retention, congenital absence of teeth, and insufficient spacing are important factors in the development of abnormal occlusion. //

Maxillary Deciduous Central Incisor — First Evidence of Calcification

14 weeks in utero (range: 12–16 weeks). //

Maxillary Deciduous Central Incisor — Eruption

Mean eruption age of 10 months (range: 8–12 months). //

Maxillary Deciduous Lateral Incisor — First Evidence of Calcification

16 weeks in utero (range: 15–16½ weeks). //

Maxillary Deciduous Lateral Incisor — Eruption

Mean eruption age of 11 months (range: 9–13 months). //

Maxillary Deciduous Canine — First Evidence of Calcification

17 weeks in utero (range: 15–18 weeks). //

Maxillary Deciduous Canine — Eruption

Mean eruption age of 19 months (range: 16–22 months). //

Maxillary Deciduous First Molar — First Evidence of Calcification

15 weeks in utero (range: 14½–17 weeks). //

Maxillary Deciduous First Molar — Eruption

Mean eruption age of 16 months; boys: 14–19 months; girls: approximately 16 months. //

Maxillary Deciduous Second Molar — First Evidence of Calcification

19 weeks in utero (range: 16–23½ weeks). //

Maxillary Deciduous Second Molar — Eruption

Mean eruption age of 29 months (range: 24–33 months). //

Mandibular Deciduous Central Incisor — First Evidence of Calcification

14 weeks in utero (range: 13–16 weeks). //

Mandibular Deciduous Central Incisor — Eruption

Mean eruption age of 8 months (range: 6–10 months). //

Mandibular Deciduous Lateral Incisor — First Evidence of Calcification

16 weeks in utero (range: 15–17 weeks). //

Mandibular Deciduous Lateral Incisor — Eruption

Mean eruption age of 13 months (range: 10–16 months). //

Mandibular Deciduous Canine — First Evidence of Calcification

17 weeks in utero (range: 16–18 weeks). //

Mandibular Deciduous Canine — Eruption

Mean eruption age of 20 months (range: 17–23 months). //

Mandibular Deciduous First Molar — First Evidence of Calcification

15½ weeks in utero (range: 14½–17 weeks). //

Mandibular Deciduous First Molar — Eruption

Mean eruption age of 16 months (range: 14–18 months). //

Mandibular Deciduous Second Molar — First Evidence of Calcification

18 weeks in utero (range: 17–19½ weeks). //

Mandibular Deciduous Second Molar — Eruption

Mean eruption age of 27 months; boys: 27 months (range: 23–32 months); girls: 24–30 months. //