19 March 2024

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Zirconia crowns and self-adhesive resin cements: evaluation of success after 5 years

Lara Figini

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Computer-aided design (CAD) and computer-aided manufacturing (CAM) technology has led to a massive increase in the production of zirconium crowns. Numerous clinical studies have demonstrated the reliability of zirconium with high survival and success rates. Zirconia crowns can be cemented with conventional methods or with adhesive systems. Currently, self-adhesive resin cement is the most frequently used to cement zirconium crowns thanks to its simplicity and the presence of 10-methacryloyloxysidecyl dihydrogen phosphate (MDP) which allows the development of an effective bond between the MDP acid group and the resin layer. zirconium oxide.

Materials and methods

In a retrospective study, published in the Journal of Oral Rehabilitation, the authors evaluated the clinical performance, survival rates, success and complications experienced with zirconium crowns cemented with two different self-adhesive resin cements. A total of 112 patients received 176 monolithic zirconium crowns. The crowns were cemented with two different self-adhesive resin cements: RelyX Unicem 2 (n = 74) and Panavia SA (n = 102).

Clinical evaluations of the crowns and supporting periodontal structures were performed. Intra-oral photographs and periapical and bitewing radiographs were obtained for further evaluation by two examiners. Descriptive statistical analysis, McNemar test, t-test, Mantel-Cox test and Kaplan-Meier survival analysis (a = .05) were performed.

Results

The 5-year survival and success rates were 100% and 96.4%, respectively. The complications encountered were recurrent caries (2.2%) and the need for endodontic treatment (0.5%). No technical complications, such as fractures or loss of retention, were observed. Cement type and patient factors did not influence crown survival and success rates.

Conclusions

From the data of this study, which must be confirmed in other similar works, it can be concluded that the 5-year survival rate of zirconia crowns cemented with self-adhesive composite cements is excellent.

Source: https://onlinelibrary.wiley.com/doi/10.1111/joor.13580