Table 2 Univariable logistic regression analysis to identify predictive factors for endodontic failure within 5 years compared to long-term endodontic failure

Patient factor

Age (per year)

45.02 ± 15.15

51.77 ± 16.82

.975

.955

.997

.023*

Sex

Male

30 (46.2)

31 (39.2)

1 (reference)

Female

35 (53.8)

48 (60.8)

.757

.387

1.480

.416

Tooth factor

Tooth type

Non-molar

16 (24.6)

33 (41.8)

1 (reference)

Molar

49 (75.4)

46 (58.2)

2.296

1.104

4.774

.026*

Tooth location

Mandibular

27 (41.5)

40 (50.6)

1 (reference)

Maxillary

38 (58.5)

39 (49.4)

1.460

.748

2.846

.267

Complex anatomy

Non-C-shaped

58 (89.2)

71 (89.9)

1 (reference)

C-shaped

7 (10.8)

8 (10.1)

.934

.307

2.847

.905

Calcified canals (Presence)

9 (13.8)

13 (16.5)

.846

.336

2.129

.723

Crack (Presence)

5 (7.7)

5 (6.3)

1.276

.352

4.618

.710

Endo-perio lesion (Presence)

2 (3.1)

3 (3.8)

.409

.041

4.026

.443

Treatment factor

Obturation quality

Adequate

9 (13.8)

17 (21.5)

1 (reference)

Inadequate

56 (86.2)

62 (78.5)

1.706

.704

4.134

.237

Coronal status

Adequate

54 (83.1)

28 (35.4)

1 (reference)

Inadequate

11 (16.9)

51 (64.6)

.112

.050

.248

.000*

Obturation quality and coronal status

Adequate obturation and adequate coronal status

7 (10.8)

4 (5.1)

1 (reference)

Adequate obturation and inadequate coronal status

2 (3.1)

13 (16.5)

.088

.013

.606

.014*

Inadequate obturation and adequate coronal status

47 (72.3)

24 (30.4)

1.119

.298

4.203

.868

Inadequate obturation and inadequate coronal status

9 (13.8)

38 (48.1)

.135

.032

.564

.006*

Additional untreated canals (Presence)

24 (36.9)

5 (6.3)

9.108

3.224

25.732

.000*

Instrument separations (Presence)

6 (9.2)

1 (1.3)

8.211

.962

70.091

.054