Abstract:

Objective To evaluate the effects of all- ceramic veneers in clinic fabricated by computer aided design/ computer aided manufacturing（CAD/CAM） system and veneered with Vita VM9. Methods 54 all- ceramic veneers were made for 12 patients. The patients were divided into three groups: Tetracycline staining group, fluorosis group and devitalization group. The color of patients′teeth was checked before and after laminates with Shade Eye. All- ceramic veneers was checked on the white background and abutment background. The value of L*, a* and b* were calculated to compare the color difference among 3 groups. The color, fitness and fracture of all - ceramic veneers were checked in clinic after restoration every 3 months. Results All- ceramic veneers as a replacement for discol- ored teeth showed good appearance. The substructures and veneers showed significant color difference between white background and abutment background in tetracycline staining group and devitalization group, but there was no significant color difference in fluorosis group. All veneers had good esthetic effect, excellent marginal fit, good gingival and adjacent condition. The fracture was not found in clinic. Conclusion The effects of all - ceramic veneers were perfect in color, fitness and stability to fracture. Fluorosis teeth is the best indication for all- ceramic veneers. To tetracycline teeth and devital teeth, the fundic porcelain with deep color should be chosen, or an opaquing material be applied as fundus in all- ceramic veneers repairing.

Key words: humanamelogenin;fusingprotein;purification;, computer aided design/computer aided manufacturing, all- ceramic veneer, color