Radiographic Interpretation

Question 1

How do we describe a radiographic lesion

Answer 1

Site
Shape
Size
Margins
Internal structure
Tooth involvement
Effect on adjacent anatomy
Number

Question 2

Why is a lesion radiolucent

Answer 2

Resorption of bone
Decreased mineralised of bone
Decreased thickness of bone
Replacement of bone with abnormal tissue

Question 3

Why would a lesion be Radiopaque

Answer 3

Increased thickness of the bone
Osteosclerosis of the bone
Presence of abnormal tissue
Mineralisation of normally non-mineralised tissue

Question 4

What is idiopathic osteosclerosis

Answer 4

This is an localised area of increased bone density with no known cause
No assoaction with inflammatory neoplastic or dysplastic processes

Question 5

What is the incidence of idiopathic osteosclerosis and where is it most commonly seen

Answer 5

6%
Most common in lower premolar region

Question 6

What is Sclerosing osteitis

Answer 6

This is a localised area of increased bone density in response to inflammation
Usually low grade Chronic inflammation

Question 7

How can we tell the difference between Sclerosing osteitis and idiopathic osteosclerosis

Answer 7

Checking for signs and symptoms and sensibility testing teeth

Question 8

What is Hypercementosis

Answer 8

This is an excessive deposition of cementum around root

Question 9

The cause of hypercememtosis is unknown however it can be seen in some conditions such as

Answer 9

Pagets disease
Diseases of the bone
Acromegaly

Question 10

What is the clinical relevance of hypercememtosis

Answer 10

Makes extractions more difficulty

Question 11

If a patient has too many teeth what is this called

Answer 11

Hyperdontia

Question 12

What is a supplemental supernumerary

Answer 12

This is a supernumerary with the same tooth morphology as a normal tooth

Question 13

What is another word for a tooth that is smaller than normal

Answer 13

Microdont

Question 14

What is another word for a supernumerary tooth that is distal to the dentition

Answer 14

Distodens

Question 15

Except for maxillary and mandibular 8s which two teeth are most commonly developmentally absent

Answer 15

Maxillary incosrs and lower 5s

Question 16

What is the normal age range for the eruption of second molars

Answer 16

11-13yeara

Question 17

Is there a relationship between hypodonita and peg shaped maxillary lateral incisors?
If so what?

Answer 17

Peg-shaped maxillary lateral incisors are more common in patients with hypodontia

Question 18

Why may a tooth look abnormal Radiographically but in reality is not malformed?

Answer 18

It may be tilted either buccally or palatally, resulting in superimposition of the developing root on the crown

Question 19

What approximate age range do they third molars start to calcify and therefore appear on radiographs

Answer 19

8-10 years

Question 20

What impact does dens in dente have on the long term prognosis of a tooth

Answer 20

The prognosis is reduced due to an increased risk of caries and pulp necrosis

Question 21

What are risks of leaving an ectopic tooth

Answer 21

External root resorption of adjacent teeth and dentigerous cyst formation

Question 22

What is the correct term for a tooth that is upside down

Answer 22

Inverted

Question 23

What does it mean when teeth are transposed

Answer 23

The teeth have switched positions

Question 24

What is the difference between gemination and fusion

Answer 24

Gemination is the development of 2 conjoined teeth from a single tooth bud
Fusion is the joining of two tooth buds resulting in 2 conjoined teeth

Question 25

What is taurodontism

Answer 25

This is when the pulp chambers are abnormally tall - and the root furcations are positioned relatively far apically

Question 26

What restorative treatment can be complicated by taurodontism and why

Answer 26

Endodontic treatment because the openings of the root canals will be abnormally deep within the access cavity

Question 27

How could taurodontism potentially complicate forceps extraction of a molar

Answer 27

The root furcation may be positioned too far apically for the forcep beaks to reach and engage

Question 28

What is the correct term for abnormal root curvature

Answer 28

Dilaceration

Question 29

What are the potential causes of dilaceration

Answer 29

Damage during tooth development by trauma or from apical infection of the preceding primary tooth Impeded tooth development by a supernumerary tooth, cyst, tumour etc

Question 30

Patient has multiple impacted teeth and multiple supernumerary teeth - what systemic developmental condition do they most likely have

Answer 30

Cleidocranial dysplasia

Question 31

What is the characteristic, non-cranial facial abnormality associated with cleidocranial dysplasia

Answer 31

Underdeveloped/ hypo plastic clavicles

Question 32

How may you tell on a radiograph that a patient thin enamel due to Amelogenesis imperfecta and not just due to caries

Answer 32

Are the unerupted teeth affected? If so this cannot be caries as they are not yet exposed to the bacteria in the oral cavity Also look at the sites of the enamel loss It will not just be at the characteristic sites for caries i.e. not at the base of occlusal fissures, nor apical to the contact points

Question 33

What may be seen in a patient with dentinogensis imperfecta on a radiograph

Answer 33

Generalised obliteration/loss of pulp chambers and generalised sclerosis of root canals

Question 34

What genetic condition can dentinogenesis imperfecta type 1 be associated with

Answer 34

Osteogenesis imperfecta

Question 35

What are 2 potential clinical implications of enamel pearls

Answer 35

Increase risk of periodontal disease by acting as plaque retentive factors Complicate extractions of teeth

Question 36

A patient has a genetic condition which has lead to severe hypodontia and conical teeth what condition do they have

Answer 36

A form of ectodermal dysplasia

Question 37

If by which age a M3M isn’t present in on an OPT it is unlikely to every

Answer 37

14 years old