Survival Rates of Endodontically Treated Teeth After Placement of Definitive Coronal Restoration: 8-Year Retrospective Study

Figures & data

Table 1 Characteristics and Distribution of Endodontically Treated Teeth

	N (%)		P-value*
	Crown n = 3362 (83.8%)	Buildup Restoration n = 650 (16.2%)
Gender
Male	1141 (33.9)	164 (25.2)	< 0.00
Female	221 (66.1)	486 (74.8)
Type of tooth
Molar	1484 (44.1)	164 (25.2)
Premolar	1055 (31.4)	0 (0)
Anterior	823 (24.5)	486 (74.8)	< 0.00
Dental Arch
Maxillary	1586 (47.2)	138 (21.2)	< 0.00
Mandibular	1776 (52.8)	512 (78.8)
Opposing dentition
Natural	2094 (62.3)	567 (87.2)	< 0.00
Fixed Prosthetic	989 (29.4)	83 (12.8)
None	279 (8.3)	0 (0)
Visits
Single	788 (23.4)	138 (21.2)	0.221
Multiple	2574 (76.6)	512 (78.8)
Post
Present	1243 (37)	0 (0)	< 0.00
Absent	2119 (63)	650 (100)
Year of dental student
4^th year	871 (25.9)	301 (46.3)	< 0.00
5^th year	2491 (74.1)	349 (53.7)

Note: *p = 0.05 (Chi-square test).

Table 2 Causes of Extraction of Endodontically Treated Teeth

Causes of Extraction	n (%)
Fracture of the crown	498 (12.4)
Causes related to prosthetics (failure of restoration)	288 (7.2)
Causes related to endodontics (a vertically fractured root)	2014 (50.2)

Figure 1 (A) Estimated survival function of ETT as a function of individuals’ gender (males n = 1305: females n = 2702). (B) Estimated survival function of ETT as a function of type of restoration (composite buildup n = 650; Crown n = 3362). (C) Kaplan-Meier survival curve as a function of time of placement of the final coronal restoration. The 8-year survival of ETT which received final coronal restoration from 0 to 14 days was 72%, from 15 to 59 days was 51% and after 60+ days was 39%.

Table 3 Eight-Year Survival Table for Endodontically Treated Teeth

Variable	8-Year Survival Based on Life Table	P-value*
Type of restoration after RCT
Full coverage cast restoration (crown)	76	< 0.000
Buildup using composite	83
Gender
Male	78	< 0.000
Female	73
Dental arch
Maxillary	68	< 0.000
Mandibular	75
Condition of opposing teeth
Natural dentition	72.8	< 0.000
Fixed Prosthesis	64.3
Edentulous/None	62
Visits
Single	73.5	< 0.000
Multiple	73.6
Post
Yes	78.6	< 0.000
No	74.3
Year of dental student
4^th	75	<0.000
5^th	72.6
Time of coronal restoration after RCT, days
0–14	51	< 0.000
15–59	74.9
60+	96

Note: *P = 0.05 (Gehan–Wilcoxon test).