Table II.
Evaluation of gingival health at different time-points of reexamination.
| Groups | Gum health levela | 1st month | 3rd month | 6th month | 12th month | 24th month | Total adverse reactions | P-value |
|---|---|---|---|---|---|---|---|---|
| U (n/%) | A | 20(100) | 20(100) | 19(95) | 18(90) | 17(85) | 4(20) | 0.342 |
| B | 0 | 0 | 1(5) | 2(5) | 1(5) | |||
| C | 0 | 0 | 0 | 0 | 0 | |||
| P (n/%) | A | 20(100) | 20(100) | 20(100) | 19(95) | 19(95) | 1(5) | |
| B | 0 | 0 | 0 | 1(95) | 0 | |||
| C | 0 | 0 | 0 | 0 | 0 |
aA, healthy gums; B, mild gum inflammation, a small amount of bleeding could be detected, mild atrophy of the gums that did not affect the appearance could be observed; C, gums had obvious redness and swelling, bleeding, as well as deepened periodontal pockets, accompanied by moderate to severe gum shrinkage which affected appearance. U, unprepared porcelain veneers; P, prepared porcelain veneers.