Effect of DIE spacer on the retention of crowns using a new adhesive resin cement

This study investigates the effect of die spacer on the retention of crowns using three different luting adhesive resins. Thirty casted metal crowns were constructed on prepared human central incisors. Half of the casted crowns were prepared using die spacer relief. A group of 10 crowns were used for each cement with the two techniques. All the crowns were dislodged using Instron testing machine. The results showed that die spacer technique decrease the retention of the crowns between 24-33%. Panavia Excement have a superior retention compared to the other cement used