Dental plaque accumulation and gingival health
ZC.Gingival
PLAQUE, PLAQUE
The PI scores of SSCs remained similar at all follow-up examinations (p = 0.447; Table 
Time-dependent changes in plaque index scores of teeth restored with crowns and intergroup comparisons between SSC and ZCPlaque index scoresMedian (Q1, Q3)Plaque index scoresMedian (Q1, Q3)* Repeated plaque index scores were compared using Friedman test** Plaque index scores of crowns were compared using Mann-Whitney U testGI scores of SSCs were significantly lower at 18 months than those at 1, 6, and 12 months (p = 0.024, p = 0.012 and p = 0.032, respectively). The GI scores at follow-ups were higher than baseline, but the difference was statistically significant only at 6 months (p = 0.032). The GI scores of ZCs were significantly different among the recall periods (p < 0.001, Table 
Time-dependent changes in gingival index scores of teeth restored with crowns and intergroup comparisons between SSC and ZC.Gingival index scoresMedian (Q1, Q3)Gingival index scoresMedian (Q1, Q3)* Stainless steel crown repeated gingival index scores were compared using Friedman test**Zirconia crown repeated gingival index scores were compared using one way analysis of variance for repeated measures due to the assumption of normality was satisfied*** Gingival index scores of crowns were compared using Mann-Whitney U test: 