5-year Clinical Study of Copy-milled Ceramic Inlays

Methods: 51 Celay restorations ( Mikrona Technologie, Switzerland ) were cemented with a dual curing resin ( Mirage FLC, Mirage Dental Systems, USA ) in 32 patients. Using the modified USPHS, 2 evaluators assessed colour match, marginal discoloration, anatomic form and marginal adaptation at baseline, 1, 2, 3, 4 and 5 years.

Results: Data for the first and fourth years were reported previously. The recall rate was 100% for the first 2 years followed by 94%, 91% and 88% for the 3rd, 4th and 5th years respectively. At the fifth year, 44 (86%) remaining restorations were evaluated. 4 patients with 7 restorations dropped out of the project. A total of 20 inlays (45%) failed, the majority of which were fractured. The remaining 24 inlays were clinically acceptable in all aspects achieving Alpha and Bravo ratings as follows :

Marginal adaptation : Alpha - (1), Bravo - (23) ; Color match : Alpha - (2), Bravo - (23) Anatomic form : Alpha - (23), Bravo - (18) ; Marginal discoloration : Alpha - (6), Bravo - (18)

Conclusions: The Celay inlay demonstrated a high failure rate over a 5-year period. Its poor performance stems from various factors and would indicate that its use in the oral cavity would be limited.