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Table 3 Correlation coefficient and regression equation for actual root length of each tooth type and estimated value using the max P4 root length formula

From: Estimation of periodontal pocket surface area in small to medium dogs: a proof-of-concept study

Maxillary tooth

Correlation coefficient

Determination coefficient

Regression equation

p-value

Mandibular tooth

Correlation coefficient

Determination coefficient

Regression equation

p-value

max I1

0.46

0.21

z = 1.06y-3.63

0.22

mandi I1

0.58b

0.34

z = 0.64y + 2.55

0.06

max I2

0.34

0.12

z = 0.50y + 3.00

0.40

mandi I2

0.52b

0.27

z = 0.86y + 0.26

 < 0.05

max I3

0.49

0.24

z = 0.94y + 1.60

 < 0.05

mandi I3

0.37

0.14

z = 0.59y + 4.52

0.07

max Canine

0.49

0.24

z = 1.49y + 2.36

 < 0.01

mandi Canine

0.71a

0.50

z = 1.13y + 5.92

 < 0.01

max P1

0.34

0.12

z = 0.34y + 2.69

0.21

mandi P1

0.76a

0.58

z = 0.29y + 3.29

0.45

max P2

0.63b

0.40

z = 0.70y-0.96

 < 0.05

mandi P2

0.52b

0.27

z = 0.41y + 2.83

 < 0.05

max P3

0.53b

0.28

z = 0.37y + 2.52

0.06

mandi P3

0.60b

0.36

z = 0.45y + 3.15

 < 0.05

max P4

ND

ND

ND

 

mandi P4

0.52b

0.27

z = 0.52y + 3.99

0.07

max M1

0.45

0.20

z = 0.44y + 2.95

 < 0.01

mandi M1

0.47

0.22

z = 0.78y + 3.20

 < 0.05

max M2

0.70a

0.49

z = 0.47y-1.44

 < 0.01

mandi M2

0.33

0.11

z = 0.25y + 3.65

0.24

     

mandi M3

0.82a

0.67

z = 0.82y-5.36

0.18

  1. Summary table of Supplement 3
  2. max maxillary, Mandi mandibular, I incisor, P premolar, M molar, ND not determined as treated as standard
  3. astrong correlation (r ≥ 0.7); bmoderate correlation (0.7 > r ≥ 0.5)
  4. z: estimated root length of each tooth, y: root length of each tooth estimated using the formula shown in Fig. 1