Abstract:

Objective　To investigate the effect of camera control devices of Cerec 2 on the fit of CAD/CAM all-ceramic copy- ings of posterior tooth.Methods　24 all-ceramic copyings were made by Cerec 2 with camera control devices and that without camera control devices. Copyings were embed and sectioned, then SEM and image analyzer was used to measure the space be- tween the copyings and dies atthe marginal opening, the axialwall, and the occlusal adaptation atthe measurement locations.Re- sults　①The marginal fit at buccal space of copyingswith camera control devices groupwas smallerthan thatwithout camera con- trol devices group(P<0·05).②The internal fit of of copyings had statistically significant difference at mesio-axial,disto-axial, bucco-axial,bucco-occlusal,linguo-occlusal and disto-occlusal space between camera control device group andwithout camera con- trol devices group(P<0·05).③There was no statistical difference on the marginal fit and internal fit of copyings between Vita MKⅡand porous alumina oxide(P<0·05).Conclusion　The Cerec 2 with camera control devices reduced effectively the in- accuracy of inner space of copyings which contributed from the technical errors of the operator, and provided well-proportioned space for adhesive. Both the fit of copyings made of Vita MKⅡand porous alumina oxide satisfied the clinical demand.

Key words: computer aided design/computer aided manufacture, all-ceramic copying, fit