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Fig. 1
Position of third molar tooth (M3s) in dental arch with respect to occlusal plane: a) fully erupted, non-impacted third molar; b) partially impacted third molar; c) completely impacted third molar
Fig. 2
Radiographic lesions of second molar teeth (M2s) adjacent to third molar teeth (M3s): a – distal caries; b – external root resorption (ERR); c) alveolar bone loss (ABL)
Influence of third molars status (non-impacted N-M3 versus impacted I-M3) on prevalence of distal pathologies in adjacent second molars (A-M2) – multivariate logistic regression model
M3 status
Caries
External root resorption (ERR)
Alveolar bone loss (ABL)
OR (95% CI)
p value
OR (95% CI)
p value
OR (95% CI)
p value
Maxillary
Absent†
1
1
1
N-M3
1.39 (1.13–1.7)
0.002*
0
0.99
1.15 (0.95–1.37)
0.14
I-M3
0.55 (0.39–0.77)
0.000*
21.84 (2.84–168.0)
0.003*
1.59 (1.27–1.99)
0.000*
Mandibular
Absent†
1
1
1
N-M3
1.48 (1.2–1.82)
0.000*
0.54 (0,03–8.69)
0.67
0.81 (0.64–1.01)
0.06
I-M3
0.89 (0.69–1.18)
0.43
28.1 (3.75–211.0)
0.001*
3.51 (2.8–4.4)
0.000*
Maxillary+
Mandibular
Absent†
1
1
1
N-M3
1.42 (1.23–1.65)
0.000*
0.28 (0.03–3.08)
0.3
1.00 (0.99–1.01)
0.9
I-M3
0.77 (0.63–0.95)
0.013*
26.0 (6.2–108.3)
0.000*
2.36 (2.01–2.76)
0.000*
Influence of third molars status (partially versus completely impacted I-M3) on prevalence of distal pathologies in adjacent second molars (A-M2) – multivariate logistic regression model
M3 status
Caries
External root resorption (ERR)
Alveolar bone loss (ABL)
OR (95% CI)
p value
OR (95% CI)
p value
OR (95% CI)
p value
Maxillary
Absent†
1
1
1
Partially I-M3
1.04 (0.72–1.48)
0.000*
26.3 (3.1–222.5)
0.003*
3.15 (2.4–4.1)
0.000*
Completely I-M3
0.07 (0.02–0.22)
0.84
24.2 (2.92–200.6)
0.03*
0.52 (0.35–0.77)
0.000*
Mandibular
Absent†
1
1
1
Partially I-M3
1.23 (0.93–1.63)
0.000*
14 (1.71–113.9)
0.01*
3.85 (3.03–4.91)
0.000*
Completely I-M3
0.22 (0.12–0.42)
0.15
59.4 (7.64–461.3)
0.000*
2.95 (2.1–4.16)
0.000*
Maxillary+
Mandibular
Absent†
1
1
1
Partially I-M3
1.21 (0.98–1.5)
0.000*
18.7 (4.2–83.2)
0.000*
3.28 (2.76–3.9)
0.000*
Completely I-M3
0.16 (0.09–0.27)
0.08
38.27 (8.68–168.8)
0.000*
1.23 (0.97–1.58)
0.09
Distal pathologies in adjacent second molars (A-M2) in quadrants with non-impacted third molars (N-M3) or with impacted third molars (I-M3)
M3 status
Caries
External root resorption (ERR)
Alveolar bone loss (ABL)
I-M3, n (%)
186 (12.93)
35 (2.42)
510 (35.5)
N-M3, n (%)
765 (19.9)
1 (0.03)
758 (19.72)
Distal pathologies in adjacent second molars (A-M2) in quadrants with or without third molars (M3)
M3 status
Caries
External root resorption (ERR)
Alveolar bone loss (ABL)
Absent, n (%)
299 (14.83)
2 (0.09)
386 (19.2)
Present, n (%)
951 (17.98)
36 (0.68)
1268 (23.96)
Distal pathologies in adjacent second molars (A-M2) in quadrants with partially impacted third molars (I-M3) or with completely impacted third molars (I-M3)
M3 status
Caries
External root resorption (ERR)
Alveolar bone loss (ABL)
Partially I-M3, n (%)
171 (18.69)
16 (1.75)
401 (43.82)
Completely I-M3, n (%)
15 (2.81)
19 (3.57)
109 (20.49)
Influence of third molars (M3) on prevalence of distal pathologies in adjacent second molars (A–M2) – multivariate logistic regression model
