Radiology Flashcards
By what percentage can Bitewing radiographs increase diagnosis of interproximal caries?
25%
By what percentage does bone have to be decalcified by in order to be viewed on a radiograph?
by 50%
Do radiographs over or underestimate the depth of decay?
underestimate
which part of the enamel lesion can you see on a radiograph?
body of the lesion
Why do radiographs underestimate the extent of caries?
only show tissues that have been decalcified by 50%
How can you describe a carious lesion?
By site, depth, restoration status of the tooth, periodontal status of the tooth
What are rampant caries?
Sudden uncontrolled destruction of the teeth that often has a trigger and involves tooth surfaces usually caries free
What are the risk factors for root caries?
Low saliva flow due to age, systemic factors, medications etc; poor OH, Periodontal bone loss and food packing
How can you tell cervical burnout from caries?
location is between enamel and the alveolar bone level; it is triangular in shape compared to the more rounded shape of caries in the cervical region; usually multiple teeth are affected in the same way especially small premolars
How can you assess a restoration radiographically?
Type and Density of restorative material, contouring of the restoration, overhang or under-restored, contact points, adaptation of restoration to base of cavity, marginal fit of cast restorations, presence of a lining material and its radiolucency
How can you assess the tooth underlying a restoration radiographically?
whether there is recurrent or residual caries, the size of the pulp chamber, whether there is internal resorption, the root filling material and completeness, presence and position of pins or posts
Name three pulpal changes associated with pulpal inflammatory change
rounding of pulp horns, pulpal sclerosis, internal resorption
What is periodontal disease?
the clinically detectable destruction of host tissues with the loss of soft and hard tissue attachment and bone
What is the role of radiographs in periodontal disease?
To assess the extent of bone loss and furcation involvement; To determine the presence of any causative factors; To assist in treatment planning; To evaluate treatment, particularly guided tissue regeneration
What classified mild periodontal bone loss?
1-2mm, 1/3 of alveolar bone lost
What classifies moderate bone loss?
2mm, 2/3 bone loss
What classified severe bone loss?
over 2/3
What are the positives of radiographs in periodontal disease?
To identify the extent of alveolar bone destruction; To identify local contributing factors; To show the bone present and the pattern of disease; To show the condition of bony crests and furcation involvement; To show the PDL width and the possibility of traumatic forces; To show irritating factors such as: calculus, overhangs, food packing areas; To show root:crown ratio
What are the two ways periodontal tissue changes can occur due to occlusal trauma?
Excessive force on a normal, intact periodontium; Normal forces on a compromised, reduced periodontium
What are some radiograph features of occlusal trauma?
Increased PDL width, Thickening of the lamina dura, Angular destruction of the inter-septal bone, Bone loss, Increase in number and size of trabeculae, Eventually can lead to hypercementosis and Root Fracture
What can cause perio-endo lesions?
Periodontal disease which has caused devitalisation of the pulp OR Pulpal disease which has caused periodontal bone loss
On a radiograph, which are the 3 most important periapical features to observe?
PDL space; Lamina Dura; Trabecular pattern and the density of the surrounding bone
What is the Lamina Dura?
The hard bony lining of the socket between the bone and PDL
What is dentinal sclerosis?
A form of secondary dentine that is chronic and progressive. It appears as overall narrowing of the pulp chamber and root canal
