Abstract
Chipping of veneering is the most common clinical complication for zirconia restorations. Veneering composite could be a promising alternative to renew restorations. Zirconia discs (3-YSZ) were prepared with varying surface treatments and bonded to indirect composite as follows: air abrasion and Scotchbond Universal (A/SU); air abrasion and Clearfil Ceramic Primer (A/C); air abrasion and MKZ Primer (A/M); air abrasion and Monobond Plus (A/MP); silica-coating and Scotchbond Universal (S/SU); air abrasion (AP/SU), additional cold atmospheric plasma treatment, and Scotchbond Universal. An indirect composite material was then applied to the zirconia specimens. Specimens were divided into subgroups for short-term (14 days storage at 37 °C and 5000 thermal cycles) and long-term (250 days storage and 37,500 thermal cycles) artificial aging. Shear bond strength measurement (SBS) was performed, and data were analyzed by Kruskal–Wallis-test and multiple comparison testing with Dunn’s correction (p ≤ 0.05). The median SBS values (MPa) of short- and long-term artificial aging were: 3.09/1.36 (A/SU); 0.77/1.43 (S/SU); 2.82/2.15 (AP/SU); 1.97/1.80 (A/C); 2.01/1.58 (A/M); and 1.70/1.68 (A/MP). For short-term artificial aging A/SU showed the highest median SBS values, whereas in the long-term trial, AP/SU showed the highest values and the difference was significant. A prolonged artificial aging decreased SBS in all groups, except S/SU. In summary, treatment with CAP can improve SBS in the long-term.
Highlights
The use of zirconium dioxide in restorative dentistry is more and more common due to its mechanical and biological behaviors, superior esthetics compared to metal-based restorations, and lower production costs compared to precious metal alloys [1,2]
Looking at the short-term experiments individually, it is noticeable that the median values of Scotchbond Universal after air abrasion (A/SU) and Scotchbond Universal with previous cold atmospheric plasma (CAP) treatment (AP/SU) are very similar and seem superior to the other groups
Shear bond strength measurement (SBS) values between a zirconia ceramic and an indirect composite with different surface conditioning methods in short- and long-term artificial aging were measured to assess the durability of the coatings
Summary
The use of zirconium dioxide in restorative dentistry is more and more common due to its mechanical and biological behaviors, superior esthetics compared to metal-based restorations, and lower production costs compared to precious metal alloys [1,2].It is used for the production of a wide field of applications such as veneers, crowns, fixed partial dentures, as well as cores, posts, and even implants and implant abutments [3,4].Ceramic layering materials are able to mask the opaque appearance of zirconia [5] and most importantly, the appearance of the restoration can be individualized and customized.or precisely because of this, cohesive fracture of the veneering porcelain is the most common clinical complication for zirconia restorations [6,7,8,9]. The use of zirconium dioxide in restorative dentistry is more and more common due to its mechanical and biological behaviors, superior esthetics compared to metal-based restorations, and lower production costs compared to precious metal alloys [1,2]. It is used for the production of a wide field of applications such as veneers, crowns, fixed partial dentures, as well as cores, posts, and even implants and implant abutments [3,4]. The increased occurrence of cohesive fracture of the veneering porcelain is to be expected
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