The purpose of this study was to determine the fracture strength of marginal ridge of restored maxillary premolar teeth. Fifty nine extracted human maxillary premolars were divided into 4 groups : 1) treated teeth 2) DO amalgam restoration 3) DO poste...
The purpose of this study was to determine the fracture strength of marginal ridge of restored maxillary premolar teeth. Fifty nine extracted human maxillary premolars were divided into 4 groups : 1) treated teeth 2) DO amalgam restoration 3) DO posterior resin restoration 4) tunnel posterior resin and silver alloy-glass ionomer cement. All teeth were loaded occlusally in a universal testing machine until they were fractured.
The obtained results were as follows :
1. The fracture strength of teeth restored with posterior resin and silver alloy glass ionomer cement on tunnel cavity showed significant difference to teeth restored with amalgam on DO cavity (P<0.01), but no significant difference to unprepared teeth (P>0.05).
2. There was significant difference of the fracture strength between teeth restored with posterior resin on DO cavity and untreated teeth (P<0.05).