Dr. O.M Ogundana Dept of Oral and Maxillofacial Pathology/Biology
Dr. O.M Ogundana Dept of Oral and Maxillofacial Pathology/Biology
Dr. O.M Ogundana Dept of Oral and Maxillofacial Pathology/Biology
M Ogundana
Dept of Oral and Maxillofacial Pathology/Biology
INTRODUCTION
Anomaly: deviation from normal
Abnormalities of size, number or shape of
teeth
CLASSIFICATION
I. Anomaly in size
II. Anomaly in number
III. Anomaly in shape
IV. Disturbances in Enamel structure
V. Disturbances in Dentine structure
I. ANOMALY IN SIZE
1. Microdontia
2. Macrodontia
II. ANOMALY IN NUMBER
1. Total anodontia
2. Partial anodontia
3. Supernumerary teeth
III. ANOMALY IN SHAPE
Peg shaped lateral Enamel pearl
Talon cusp Hutchinson’s teeth
Gemination Concrescence
Fusion Dilaceration
Taurodontism Hypercementosis
Dens invaginatus Supernumerary
Dens evaginatus roots
IV. DEFECT OF ENAMEL
1. Hereditary enamel defect (Amelogenesis
imperfecta)
2. Acquired enamel defect
V. DEFECT OF DENTINE
1. Dentinogenesis imperfecta
2. Dentine dysplasia
ANOMALY IN SIZE
Microdontia: very small but normally
shaped tooth
Affects mostly the maxillary lateral incisors
or maxillary third molars
Occur in pituitary dwarfism.
Can cause spacing in primary and
permanent dentition
Macrodontia: larger than normal but
normally shaped teeth
Seen in hemifacial hypertrophy
It may lead to crowding in primary and
permanent dentition.
ANOMALY IN NUMBER
Anodontia: congenital absence of teeth
because of failure of development of tooth
germs.
Total anodontia: congenital absence of all
teeth, it is however rare
Partial anodontia (hypodontia): some
teeth are congenitally missing, it is more
common
Total anodontia is usually occurs in
association with an hereditary condition
called ectodermal dysplasia
In this condition all ectodermally dervied
structures are defective e.g hair, sweat
glands and teeth
Most commonly missing permanent
dentition: Third molars (maxillary >
mandibular), followed by maxillary lateral
incisor and mandibular second premolar
Supernumerary teeth
Additional number of teeth, over and above
the usual number for the dentition
Most common location in mandible for
supernumerary tooth: mandibular 2nd
premolar area
Mostly seen in Gardner's syndrome,
Cleidocranial dysplasia, and cleft palate or
cleft lip
Types of supernumerary teeth: