Kernrechtsfrage
Whether the tooth fracture qualified as an accident under compulsory accident insurance.
Extrahierter Entscheid
No. The fracture was not treated as an accident because the tooth had already been fissured and its mechanical resistance was greatly reduced.
Extrahierte Begründung
A pre-existing fissure and markedly diminished resistance meant that a fracture had to be expected at any time during ordinary mastication; the stone was therefore not the legally relevant accident cause.