Radiographic Interpretation Flashcards
How do we describe a radiographic lesion
Site
Shape
Size
Margins
Internal structure
Tooth involvement
Effect on adjacent anatomy
Number
Why is a lesion radiolucent
Resorption of bone
Decreased mineralised of bone
Decreased thickness of bone
Replacement of bone with abnormal tissue
Why would a lesion be Radiopaque
Increased thickness of the bone
Osteosclerosis of the bone
Presence of abnormal tissue
Mineralisation of normally non-mineralised tissue
What is idiopathic osteosclerosis
This is an localised area of increased bone density with no known cause
No assoaction with inflammatory neoplastic or dysplastic processes
What is the incidence of idiopathic osteosclerosis and where is it most commonly seen
6%
Most common in lower premolar region
What is Sclerosing osteitis
This is a localised area of increased bone density in response to inflammation
Usually low grade Chronic inflammation
How can we tell the difference between Sclerosing osteitis and idiopathic osteosclerosis
Checking for signs and symptoms and sensibility testing teeth
What is Hypercementosis
This is an excessive deposition of cementum around root
The cause of hypercememtosis is unknown however it can be seen in some conditions such as
Pagets disease
Diseases of the bone
Acromegaly
What is the clinical relevance of hypercememtosis
Makes extractions more difficulty
If a patient has too many teeth what is this called
Hyperdontia
What is a supplemental supernumerary
This is a supernumerary with the same tooth morphology as a normal tooth
What is another word for a tooth that is smaller than normal
Microdont
What is another word for a supernumerary tooth that is distal to the dentition
Distodens
Except for maxillary and mandibular 8s which two teeth are most commonly developmentally absent
Maxillary incosrs and lower 5s
What is the normal age range for the eruption of second molars
11-13yeara
Is there a relationship between hypodonita and peg shaped maxillary lateral incisors?
If so what?
Peg-shaped maxillary lateral incisors are more common in patients with hypodontia
Why may a tooth look abnormal Radiographically but in reality is not malformed?
It may be tilted either buccally or palatally, resulting in superimposition of the developing root on the crown
What approximate age range do they third molars start to calcify and therefore appear on radiographs
8-10 years
What impact does dens in dente have on the long term prognosis of a tooth
The prognosis is reduced due to an increased risk of caries and pulp necrosis
What are risks of leaving an ectopic tooth
External root resorption of adjacent teeth and dentigerous cyst formation
What is the correct term for a tooth that is upside down
Inverted
What does it mean when teeth are transposed
The teeth have switched positions
What is the difference between gemination and fusion
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
What is taurodontism
This is when the pulp chambers are abnormally tall - and the root furcations are positioned relatively far apically
What restorative treatment can be complicated by taurodontism and why
Endodontic treatment because the openings of the root canals will be abnormally deep within the access cavity
How could taurodontism potentially complicate forceps extraction of a molar
The root furcation may be positioned too far apically for the forcep beaks to reach and engage
What is the correct term for abnormal root curvature
Dilaceration
What are the potential causes of dilaceration
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
Patient has multiple impacted teeth and multiple supernumerary teeth - what systemic developmental condition do they most likely have
Cleidocranial dysplasia
What is the characteristic, non-cranial facial abnormality associated with cleidocranial dysplasia
Underdeveloped/ hypo plastic clavicles
How may you tell on a radiograph that a patient thin enamel due to Amelogenesis imperfecta and not just due to caries
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
What may be seen in a patient with dentinogensis imperfecta on a radiograph
Generalised obliteration/loss of pulp chambers and generalised sclerosis of root canals
What genetic condition can dentinogenesis imperfecta type 1 be associated with
Osteogenesis imperfecta
What are 2 potential clinical implications of enamel pearls
Increase risk of periodontal disease by acting as plaque retentive factors
Complicate extractions of teeth
A patient has a genetic condition which has lead to severe hypodontia and conical teeth what condition do they have
A form of ectodermal dysplasia
If by which age a M3M isn’t present in on an OPT it is unlikely to every
14 years old
