Ceramic Repair Products Vary Widely in Durability, Study Shows
A new lab study testing five commercial repair systems for cracked dental ceramics found significant performance differences, with some products delivering bond strength up to twice as strong as others. The findings could help dentists and manufacturers choose more reliable repair options and reduce costly failures of expensive dental restorations.
Originaltitel: Shear Bond Strength of Five Different Repair Systems to Three Different Ceramic Materials
<p>Purpose: To investigate the shear bond strength of composite resin in five different ceramic repair systems for three different ceramic materials. Materials and Methods: A total of 225 monolithic zirconia (Zr), lithium disilicate (LDS), and cobalt-chromium (CoCr) specimens with feldspathic porcelain (FP) veneer were fabricated (N = 75 per material). The specimens underwent thermocycling and were randomly divided into five groups for the following intraoral repair systems (n = 15): (1) Clearfil Ceramic Primer Plus, Kuraray Noritake; (2) iBond Intraoral Repair Kit, Kulzer; (3) VOCO Cimara, VOCO Dental; (4) Ceramic Repair System Kit, Ivoclar Vivadent; and (5) Ultradent Porcelain Repair Kit, Ultradent Products. After surface conditioning, composite was applied using a cylindrical mold, and a second round of thermocycling was performed. Each specimen was then subjected to shear load until failure. Microshear bond strength was compared using one-way ANOVA ( Tukey test, alpha < .05). Results: The type of porcelain repair kit significantly affected the shear bond strength. For Zr, the repair systems from Kulzer and VOCO had significantly higher shear bond strength than the other systems (P < .001), without significant difference between Kulzer and VOCO. For the LDS and CoCr with FP, hydrofluoric acid had the highest shear bond strength (P < .001). Conclusions: For zirconia, a 10- methacryloyloxydecyl dihydrogen phosphate (10-MDP) system should be used. The results also suggest that a cleaning bur may be beneficial. For glass-based ceramics and FP, etching with hydrofluoric acid remains the method of choice.</p>