Radiographic interpretation

of

part 2))Dental Anomalies

By

Ahmed M bakry

5-Variation in structure

Amelogenesis imperfecta

Hypoplastic type

Hypocalcified type

Hypoplastic type

Dentinogenesis imperfecta

Regional adontodysplasia

Aequired abnormalities

Acquired changes of the dentition,

those that are initiated

development of the tooth, range after

severity in

from changes that have no clinical

significance to those

that cause tooth loss.

ATTRITION

Attrition is the

physiologic

away ofwearing

tooth structure. Note

the severe wearing

of almost the total

coronal aspect of

these mandibular

incisors.

Abrasion

is the nonphysiologic wearing away of teeth by

contact with foreign substances. It results from friction

occupational or habits induced by factitious. hazards

improper tooth brushing

and improper or excessive use of dental floss. Other

causes include pipe smoking, opening hairpins with the

teeth, improper use of toothpicks, denture clasps.

portionl cervicaAbrasion of the of these

teeth is evident from excessive improper) use of dental(and

of the obliteration. Note the flossand reduction pulp chambers

of the root canals. size in

Abrasion on the

distal aspect

of the maxillary

cuspid due to a

.denture clasp

EROSION

Erosion of teeth results from a chemical action not involving bacteria.

The source of the acid may be

(1) chronic vomiting or acid reflux from gastrointestinal disorders or

(2) a diet in which the individual consumes large

amounts of acidic foods .

RESORPTION

by the removal of tooth structureis Resorptionosteoclasts, referred to as odontoclast when they are resorbing tooth structure.

on the basis of the classifiedis Resorptionsurface of the tooth being resorbed.

1-external resorption

2-internal resorption

Internal resorption

the pulp occurs within resorptionInternal chamber

of the resorption involvesor canal and surrounding

in enlargement of the resultsdentin. This size of the

pulp space at the expense of tooth structure.

EXTERNAL RESORPTION

of the outer surfaceresorb the odontoclasts

tooth.

This most commonly involves the root

surface but may also involve the crown of

an unerupted tooth. The resorption may

and in and dentin cementuminvolve

some cases gradually extends to the pulp.

external root resorption

involving

lateralor buccalthe

surface of the root of the

mandibular

central incisors which

appears as a sharply

defined

radiolucency confined to the

root surfaces.

Idiopathic external

root resorption of the

mandibular tooth.

If resorption

continues,

it may result in

exfoliation of the tooth

Secondary or reparative dentin is present in the restored molar

successful pulpas a result of

capping treatment.

The secondary dentin

) hasradiopaque(

occurred between the

lining of calcium

hydroxide (radiolucent)

and the pulp chamber.

Secondary dentin

Pulp stones

Pulp stones

(denticles) in the pulp

chambers of the first

and second molars.

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