Premature eruption of teeth can occur before the normal eruption time due to familial patterns or endocrine disorders affecting the thyroid, adrenals, or gonads. Typically only one or two teeth, most commonly the mandibular central incisors, erupt early and may be mobile. Delayed eruption can be caused by systemic conditions like rickets or local factors such as dense gingival tissue that prevents eruption, resulting in partially impacted teeth, deviations in eruption path, or pseudo anodontia. Extraction of premature teeth followed by space maintenance is often used to allow for normal eruption of permanent teeth.

1. Premature eruption

2. General information
The eruption of teeth may occur
before their normal eruption time
in some cases tooth may be present
as Natal teeth are neonatal teeth

3. Aetiology
Familial pattern
Endocrine disorders secretion of several
endocrine organs like thyroid, adrenals and
gonads may alter the eruption rate of teeth. It
can also be occurred in adrenogenital syndrome

4. Clinical features
Usually only one or two teeth erupt early, mostly
deciduous and mandibular Central incisors
the teeth are mobile
may give rise to premature eruption of
permanent teeth

5. Delayed eruption
In some cases eruption
may be delayed
it may occur due to various
conditions

6. Aetiology
Systemic conditions like rickets,
cretinism and cleidocranial dysplasia
Local factors like fibromatosis gingiva
in which dense connective tissue does
not permit the eruption of teeth

7. Clinical features
Partially impacted teeth
deviation in eruption path
pseudo anodontia

8. Management
Extraction of teeth
and space maintainer
– extract the primary
teeth and use space
maintainers until the
permanent tooth
erupts