Key key way /Dove tail

 A connector is that part of an fixed partial denture that unites a pontic to a retainer or joins pontics together. Connectors are classified as rigid soldered joint or nonrigid key-to-keyway arrangements known as semi precision attachments. The term stress breaker is commonly applied to nonrigid connectors. Rigid connectors are by far the most popular option. There are problem situations where a stress-broken fixed partial denture is the restoration of choice. A stress-broken joint is indicated when there is no common path of insertion for the retainers or when an FPD includes an intermediate abutment.