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Flashcards in selection and perception of radiographs Deck (16)
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periodical radiography seletion

- this would be chosen if the causative tooth is obvious and the patient would like to save it by RCT


what would you use if there was swelling and truisms

- this can make getting an x-ray in the mouth difficulty then a sectional panoramic film is recommended (extra oral)
- this should identify obvious caries or apical infection


if caries is not obvious

- if it is not obvious then you can use a bitewing radiograph of the symptomatic side (typically shows the premolars and the molars on that side)


risk of caries and repetition for screening of caries radiographs

1) low
- 2 years
2) moderate
- 1 year
3) high
- 6 months


when are periapcial films recommended

suspect a combined peri-endo lesion
- this is a combination of periapical infection and periapical disease
- allows you to see apical tissues and the bone levels


what are radiographs not necessary for

diagnosis of periodontal disease but BPE probe is
- current guidelines state radiographs should be available for all code 3 (4-5mm) and 4 sextants (greater than 6mm)
- can either be a bitewing (horizontal or vertical) or a periapical
- can determine the level of alveolar bone loss using this radiograph


endodontic radiographs

1) pre treatment
- allows to estimate length of endodontic instrument
2) guide file
- file to the working length
- 2nd radiograph allows you to check the working length ensure within 1mm of radiographic apex of the root, not too long/short
3) master cone
- 3rd radiograph used to check full length to apex
4) final fill
- take post obturation fill radiograph

- within 12 months of completion root fillings usually fail within this
- so review film is taken about 1 year after completing treatment


when should radiographs be used in orthodontics

- when deciduous or permanent teeth need extracting
- to determine the presence of unerupted permanent teeth
- when functional appliances or combined orthodontic/orthognathic surgery is planned


pre extraction radiographs

no evidence to support this
- diagnosis is evident then its tneeded


when is pre extraction radiographs required

when 3rd molar extractio
root anatomy is not predictabel
- sectional or full panoramic radiograph (OPG)


TMJ problems

patients that fail to respond to conservative measures an open mouth panoramic film is worthwhile to confirm the bony anatomy is normal
- for internal derangement of the disc, MRI is needed to make diagnosis (only scan allowing disc to be seen in the joint)


best films for trauma investigations

Intra oral periapical or occlusal films are the best examination to identify root or dentoalveolar fractures
- Reduced exposure films are good at identifying tooth fragments lodged in the soft tissues eg lips


what views are used to identify facial bone injuries

- Occipitomental (OM) views


salivary gland disease

Patients present with symtoms of
- pain and swelling when eating (under lower border of mandible or next to the ear)
i.e. meal time syndrome
- painfull due to saliva being stuck due to the obstruction and gland surrouneded by fibrous capsule, therefore painful

- can be detected by radiographs but sialgram is better (iodine dye)


how to improve percemtopn

1) have the correct attitude
- don’t just take a quick look
- don’t be rushed
2) shut blids/turn off lights
- twilight is best lighting for analysing radiographs
3) know anatomy
4) develop a system for screening the whole image
- avoid tunnel vision
- don’t miss something that is there
5) remember radiographs are 2d images of 3 d objects
- something that appears in bone may not be


what does absorption of x ray depend on

- thickness
- density
- atomic number