Endodontics · single question
Which traumatic dental injury has the WORST endodontic prognosis?
Show answer and explanation
Correct answer: A. Intrusion
✓ A) Intrusion has the worst endodontic prognosis.
Intrusive luxation (tooth forced apically into the socket) has the WORST prognosis because: (1) the apical blood supply is completely crushed/severed; (2) the PDL fibers are completely disrupted; (3) pulp necrosis rate is ~96% in mature teeth; (4) high risk of ankylosis, external root resorption, and marginal bone loss. Extrusion has a better prognosis (partial PDL preservation, revascularization possible in immature teeth). Concussion/subluxation = best prognosis. Intrusion = worst across all luxation injuries.
Intrusive luxation (tooth forced apically into the socket) has the WORST prognosis because: (1) the apical blood supply is completely crushed/severed; (2) the PDL fibers are completely disrupted; (3) pulp necrosis rate is ~96% in mature teeth; (4) high risk of ankylosis, external root resorption, and marginal bone loss. Extrusion has a better prognosis (partial PDL preservation, revascularization possible in immature teeth). Concussion/subluxation = best prognosis. Intrusion = worst across all luxation injuries.