Long-Term Follow-Up of Nonsurgical Endodontic Treatments Performed by One Specialist: A Retrospective Cohort Study about Tooth Survival and Treatment Success

Table 2

Cumulative survival rate over time.

Time frame	Primary treatment			Secondary treatment			All
	n	CSR%	95% CI	n	CSR%	95% CI	n	CSR%	95% CI
0–5 years	1779	98.45	97.85%–99.05%	900	98.62	97.83%–99.41%	2679	98.51	98.03%–98.99%
6–10 years	1286	95.82	94.73%–96.91%	683	96.08	94.62%–97.54%	1969	95.91	95.03%–96.79%
11–15 years	858	90.75	88.85%–92.65%	465	92.95	90.74%–95.16%	1323	91.53	90.07%–92.99%
16–20 years	430	84.10	80.99%–87.21%	261	89.79	86.68%–92.90%	691	86.25	83.98%–88.52%
21–25 years	175	75.39	70.19%–80.59%	144	81.40	75.79%–87.01%	319	77.72	73.88%–81.56%