Questione giuridica chiave
Whether the tooth fracture qualified as an accident under compulsory accident insurance.
Decisione estratta
No. The fracture was not treated as an accident because the tooth had already been fissured and its mechanical resistance was greatly reduced.
Motivazione estratta
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.