Objective: Dental ceramics have superior characteristics for fixed restorations. However, crack propagation and chipping are also common problems. Repair availability of a restoration would be advantagous for both clinician and patient.The aim of this study was to compare different repair techniques and materials. Material and Methods: Fifty specimens were fabricated from feldspathic ceramic. The specimens were divided into 5 groups (n=10) for different repair techniques. For the direct repair, a repair set was used and composite resin was applied using a silicone matrix. For indirect repair, the composite resin and ceramic repair components were prepared. All ceramic surfaces were etched with 40% phosphoric acid. For cementation of the repair ceramic and repair composite resin, a dual polymerized composite resin or a commercial cyanoacrylate (CA)was used. After cementation/CA application, all specimes were thermocycled. The shear test was performed with 5-mm/min crosshead speed. The shear bond strength values were recorded in Newton and converted into megapascal (MPa). Data (MPa) were analyzed using Kruskal-Wallis non-parametric test, and for the multiple comparisons, the Dunn test was used with Benforrini corrections (α=.05). Results: The higher mean shear bond strength values were observed with the direct composite resin repair technique (20.73MPa), composite resin applied with CA (14.77 MPa), and ceramic cemented with dual-polymerized composite resin (14.98 MPa), The lowest shear bond strength value was observed with the ceramic-to-ceramic bonding with CA (8.59 MPa). Conclusion: Direct repair technique showed the best shear bond strength values while other techniques can be used for interim solutions.
Tópico:
Dental materials and restorations
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FuenteTurkiye Klinikleri Journal of Dental Sciences