Third molars 1 Flashcards
when do they erupt?
18-24 years old
when does crown calcification start
7-10 years
when does crown calcification end?
18yrs old
when is root formation of 3rd molar completed
18-25yrs old
by what age if absent, fail to erupt
14yrs old
consequence of impaction of 3rd molar
caries
pericoronitis
cyst formation
nerves at risk during 3rd molar surgery
inferior alveolar nerve
lingual nerve
nerve to mylohyoid
long buccal nerve
distance of lingual nerve to mandible
0-3.5mm medially
guidelines involved in 3rd molars
NICE- Guidance on Extraction of Wisdom Teeth, 2000
SIGN Publication Number 43 – Management of Unerupted and Impacted Third Molar Teeth, 2000
FDS, RCS 2020 - Parameters of Care for patients undergoing mandibular third molar surgery
therapeutic indications for extraction of 3rd molar
infection (caries, pericoronitis)
cysts
tumours
external resorption of 7/8
indications for extraction of 3rd molar
orthognathic surgery
fractured mandible
high risk of disease
GA
autotransplantation
Medical indication ( awaiting cardiac surgery, immunisuppressed, prevent osteonecrosis)
what is pericoronitis?
inflammation around the crown of a tooth, due to food /debris trapping under operculum
what is related to incidence of pericoronitis
URTI
Pericoronitis signs and symptoms
pain
pus discharge
bad taste
swelling
limited mouth opening
ulceration of operculum
fever
foetor oris ( bad breath)
Pericoronitis Tx
irrigation with saline/ CHX w/ 10-0ml syringe with blunt needle under operculum
XLA of opposing upper 8
saline/ CHX mouthwash
IDB
Incision of localised pericoronal abscess
