Repair Of Fractured Porcelain Restoration With Silance Coupling

Objective: To evaluate the shear bond strength of silane coupling to porcelain reaping and composite resin.To study the clinical effect of silane coupling from CLEARFIL REPAIR on restoring porcelain fracture of PFM and to provide reference for clinical application. Methods: 20 porcelain test specimen were divided randomly into two groups of 10, After surface treatment, and all the specimen of the experiment group were treated with silane coupling agent plus composite resin cylinders while the specimen from control group were treated only with composite resin cylinders.All the specimen was bonded with CLEARFIL REPAIR system.and stored in 37 degrees C distilled water for 24 hours. Shear force were forced in AG-10TA universal testing machine at a crosshead speed of lmm/min. 40 patients with fracture were chosen clinically and were repaired by CLEARFIL REPAIR, The patients were followed up 6 months for offer repairtion. Results: The shear bond strength of experiment group was significantly higher than that of control group (P<0.05). It showed that the stronger bonding strength existed in the experiment groups with silane coupling.All the patients were successfully followed up for 6 months with only ten percents refracture rate. Conclusion: The shear bond strength between porcelain and composite could be significantly improved by using silane coupling .The CLEARFIL REPAIR systerm proved to be a clinically applicable method to restoring porcelain fracture with satisfactory effect.