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Table 4 Associations between clinical characteristics and apical periodontitis (Odds Ratios [OR] and 95% confidence intervals [CI] are presented)

From: Apical periodontitis in southern Estonian population: prevalence and associations with quality of root canal fillings and coronal restorations

Variables

 

P

OR

95% CI

Length of root filling

0-2 mm from radiographic apex

 

1.00

 

More than 2 mm short from the radiographic apex

≤0.001

1.76

1.62–1.91

Extrusion of material through the apex

≤0.001

2.51

2.12–2.97

Density of root filling

Homogenous

 

1.00

 

Inhomogenous

≤0.001

1.61

1.47–1.76

Restoration

No restoration

 

1.00

 

Filling

≤0.001

0.45

0.39–0.52

Crown

≤0.001

0.34

0.29–0.41

Bridge

≤0.001

0.33

0.27–0.40

Quality of prosthetic restoration

Adequate

 

1.00

 

Inadequate

0.020

1.63

1.45–1.81

Post in root canal

No post

 

1.00

 

Fibre post

NS

0.95

0.90–1.24

Prefabricated

NS

1.68

0.89–2.89

Cast post

NS

1.34

0.69–2.35

Caries

Absent

 

1.00

 

Present

≤0.001

2.30

2.14–2.48

Orthodontic appliance

Absent

 

1.00

 

Present

NS

0.74

0.42–1.34

Tooth localization

Maxilla

 

1.00

 

Mandibula

≤0.001

2.30

2.14–2.47

Tooth type

Incisor

 

1.00

 

Canine

0.012

0.79

0.67–0.95

Premolar

NS

0.97

0.87–1.08

Molar

0.000

1.79

1.62–1.98

Gender

Female

 

1.00

 

Male

≤0.001

1.44

1.34–1.55