A total of 202 full coverage crowns from 131 patients was investigated to find out the relationships between crown contour and gingival response. Every experimental crown has its contralateral natural tooth for its control group. Gingival index and buccolingual width of the cr,>wns were measured on both experimental and control group.
Following conclusions were obtained from the study.
1. Most of the crown restorations were overcontoured and the increments were servere at cervical and height of contour area.
2. Height of contour and contact point of the restored crown were located near cervical area.
Besides, most crowns had narrow embrasure with wide contact area.
3. Gingival Index around crown restorations was significantly larger than that of control group. 4. The interrelationship between Gingival Index and restored material or restored period was
not verified at 5% significant level.
5. When grouping the artificial crowns into overcontoured, normal contoured, and undercontoured group by their width increment, the gingival inflammation was the severest in the overcontoured group and the mildest in the undercontoured group.
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