RESUMO
Porcelain fracture over non-precious crown copings is a common clinical disaster. It occurs always during cementation procedure or short after cementation and cause a great problem for the clinician. Repairing of fractured porcelain takes place if the fracture happens after cementation in the patient mouth. If the fracture happens during check up for cementation, the clinician immediately sends the fractured crown or bridge to the laboratory for correction. The correction by the laboratory is done through reapplication of porcelain on the fractured area and firing it again [reporcelainization]. The laboratory may sandblast the bare area before reapplication of porcelain, or not, exposing the restoration to the effect of the multiple firings. This problem is of great importance since till now there is lack of literature that investigates this point, especially the relationship between reapplication of porcelain on metal surface after porcelain failure and the new bond strength between the reapplied porcelain and metal