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[Clinical evaluation of zirconia all-ceramic crowns and bridges designed and manufactured by computer aided design and computer aided manufacture system].

OBJECTIVE
To evaluate the clinical behavior of zirconia restorations fabricated by computer aided design and computer aided manufacture (CAD-CAM) system.


METHODS
One hundred and thirteen patients with 167 unit restorations were enrolled in the study. First, the shape of abutment teeth and occlusion record was captured and digitized by Sirona inEos system. Then, each individually shaped framework was created using the cut-back program of inLab V3.85 software to leave a uniform thickness to the ceramic veneer. All restorations were veneered with Vita-VM9 and evaluated at baseline, 6, 12 months after delivery using the modified U S Public Health Service Criteria (USPHS).


RESULTS
During the 6 to 12 months' follow-up visit, the success rate of the restorations was 96.1% (147/153), none was replaced due to framework fracture or unrestorable delamination of the ceramic veneer, and all patients were satisfied with the shape and color of their restorations.


CONCLUSIONS
Based on the results of this study, it can be concluded that zirconia frameworks demonstrated sufficient stability for all-ceramic fixed partial denture using individual-design processing technology.