TABLE 2.

Characteristics of patients who reached the 20‐year examination

	Patients	Age (years)	Smokers	Teeth extracted (0–10 years)	Teeth extracted (10–20 years)	Implants removed (0–10 years)	Implants removed (10–20 years)	Patients treated with CIST C/D (0–10 years)	Patients treated with CIST C/D (10–20 years)
PHP	22 (26.2%)	63.4 ± 12.1	4 (18.2%)	0.6 ± 0.9	0.3 ± 0.6	0	2 (5.1%)	5 (22.7%)	7 (33.3%)
mPCP	29 (34.5%)	70.6 ± 9.7	4 (13.8%)	1.3 ± 1.3	1.1 ± 1.2	2 (3.3%)	3 (5.1%)	13 (43.3%)	14 (48.3%)
sPCP	33 (39.3%)	71.0 ± 7.8	6 (18.2%)	1.9 ± 2.1	1.3 ± 1.3	1 (1.4%)	4 (5.6%)	19 (57.6%)	19 (61.3%)
Statistical difference between
All groups		p = .01	p = .87	p = .01	p < .01	p = .61	p = .94	p = .01	p = .04
PHP vs. mPCP		p < .01		p = .03	p < .01			p = .04	p = .04
PHP vs. sPCP		p < .01		p < .01	p < .01			p = .04	p = .04
mPCP vs. sPCP		p = .46		p = .15	p = .18			p = .07	p = .06

Note: Mean number of teeth extracted and implants removed during the first 10‐year of SPC and between 10 and 20 years of SPC. Continuous variables are expressed as mean ± standard deviation, categorical variables are expressed as number of observations (percentage). One‐way ANOVA test with post hoc Bonferroni correction (Kruskal–Wallis with post hoc Dunn test for non‐normal data) was used for inter‐group comparisons. The level of significance was set at 5%. Italic values show p < .05.

Abbreviations: CIST, cumulative interceptive therapy; mPCP, moderate periodontally compromised patients; PHP, periodontally healthy patients; sPCP, severe periodontally compromised patients.