OS - difficulty of xla Flashcards
why do older teeth pose more risks with xLA?
more brittle
heavily restored
loss of elasticity - potential fracture tuberosity/ alveolus
what type of ethnic background makes xLA more difficult?
african
dense alveolar bone
why do lone standing molars increase difficulty of xLA?
subject to occlusal force = thickening of alveolar bone and PDL = risk of fracture and OAC
describe impaction?
tooth is prevented from achieving a functional occlusal position
what are the commonest impacted teeth?
mandibular third molars
maxillary canines
maxillary incisors
second premolars
(teeth that erupt last)
what is a soft tissue impaction?
an operculum over the 8s commonly
why do teeth get crowded?
teeth that erupt later if there is a lack of space or teeth are positioned badly
how does crowding affect xLA?
prevents access for beaks of forceps
how is access difficult to third maxillary molars sometimes?
mouth opening brings coronoid process into the space lateral to max third molar
teeth are often slightly buccal inclined
what forceps may need to be used for xla of maxillary third molars?
bayonets
what happens to the maxillary antrum in the area of a lone standing molar?
it will expand in to the space where adjacent teeth would occupy
how does abrasion affect the difficulty of xla?
predisposes crown to fracture
if beaks not firmly on solid root then the crown will fracture off
how do endodontically treated teeth affect the difficulty of xla?
brittle and more likely to fracture
if the crown of a tooth has fractured off, in what circumstance are we still able to remove without surgery?
if root still visible above levels of alveolus - use elevators
why are impacted teeth removed?
orthodontic reasons
restorative/ aesthetic reasons
pathology
