<unk>  (also termed<unk>  chamber<unk>  or root<unk><unk>  is a condition which can occur in teeth where hard tissue is deposited along the internal walls of the root<unk>  and fills most of the<unk>  system leaving it narrowed and restricted. The exact causes of<unk><unk>  are unclear but it typically occurs in response to dental trauma, especially following luxation injuries involving displacement, particularly if a tooth is replanted after being completely avulsed (knocked out) This response is common in this scenario and typically starts to occur several months after replantation. In other cases<unk>  can occur if the tooth is drilled down extensively during dental treatment, e.g. during crown preparation. Signs and symptoms of<unk>  include: * Yellow tooth discoloration * Lack or response to<unk>  sensibility test (e.g. ethyl chloride, electric<unk>  test) * Lack of visible radiolucency where<unk>  system should be on radiographs (x-rays) Most of the time this condition is painless and is managed conservatively by monitoring the tooth with routine radiographs. There is a small risk of<unk>  necrosis. If root<unk>  treatment is attempted it can be difficult or impossible on a tooth with<unk> .
Pulp canal obliteration
Condylar resorption
Nail disease
Velopharyngeal insufficiency
Condylar hypoplasia
Nasal septum deviation
Condylar hyperplasia
Velopharyngeal inadequacy