Clinical outcomes of tooth-supported leucite-reinforced glas
Leucite-reinforced glass-ceramic crowns can be considered a safe and predictable treatment choice for restoring both anterior and posterior teeth.

The aim of this retrospective clinical study was to investigate the survival rate, technical and biologic complications of leucite-reinforced glass-ceramic crowns after a follow-up time of 13–15 years.

Fifty-three patients with 131 crowns were invited to the follow-up visit. The reconstructions were re-examined clinically and radiographically using the modified USPHS criteria and periodontal parameters of probing pocket depth (PPD), plaque index (PI), sulcus bleeding index (SBI).

Patient satisfaction and post-operative sensitivity of the abutment teeth were evaluated with a questionnaire. The overall survival rate and the Kaplan-Meier survival estimate were calculated both on the crown and patient level. Technical and biological complications were reported descriptively on the crown level.

Thirty-eight patients with 93 crowns were examined.

- The overall survival rate of all the crowns was 79.6% after a mean observation period of 14.4 ± 1.2 years.

- Most of the failures occurred after 11.1 years. The most common clinical failures were unacceptable ceramic fractures or chippings, which occurred in 5 out of 93 crowns, and periodontitis, seen in 4 out of 93 teeth.

- The most frequent technical complications were related to occlusal wear. Biological complications were not common.

Conclusively, leucite-reinforced glass-ceramic crowns showed a high survival rate of 79.6% after an observation period of 13–15 years. Ceramic fractures and periodontitis accounted for the majority of clinical failures.

Journal of Dentistry