Abstract
The frequency of cusp fracture of endodontically treated premolars was investigated in a retrospective study. After endodontic therapy, the teeth were either restored with a MOD amalgam filling, or with an enamel-bonded MOD resin filling. A very high frequency of cusp fracture was found in premolars restored with amalgam: nearly one-third fractured within 3 years after endodontic treatment. The frequency of cusp fracture differed among the 4 amalgam-restored teeth; the lower first premolar had a 15-year survival rate of 74%, in contrast to an average of 32% for the other 3 premolars. No resinrestored premolar fractured during the first 3 years, and the difference between amalgam and resin-restored teeth was highly significant at the 0–3 year interval. However, fracture of resin-restored premolars did happen in the following 3–10 year interval. From a periodontal point of view, a low frequency of cusp fracture carries great weight, and it is therefore concluded that an enamelbonded resin filling may be a treatment option much preferred to amalgam in temporarily restoring endodontically treated premolars with MOD cavities.
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