Porcelain-to-composite bond strengths using four organosilane materials

The flexural strengths of porcelain bonded to composite resin specimens using four organosilane materials were compared. Eighty hand-condensed Vita porcelain specimens were stored in distilled water or ambient humidity before sectioning. Three groups (n = 30) of hydrated specimens were repaired to their original dimensions by using Silux composite resin with Kerr Ultrafine Porcelain Repair Bonding system, 3M Porcelain Kit with ScotchPrimer, or Fusion materials. A fourth group (n = 30) of hydrated specimens was repaired with the DenMat Ultrabond Restorative kit. Four groups (n = 10) of unhydrated specimens were repaired the same as the hydrated specimens. Fracture occurred at the porcelain-to-composite resin interface with three-point loading on the repair interface at 3 x 10(2) mm/min. No difference between Kerr, 3M, and Fusion products, when used with Silux composite resin, was found. The DenMat product had lower strengths. The unhydrated specimens had significantly higher bond strengths than the hydrated specimens with all products.