Table 4 a, b Influence of emergence angle (EA) and convexity on time-adjusted bone loss. a) demonstrates the effect, if the EA is measured from the implant collar border and b) shows the effects, if EA is measured from the border of the adhesive platform. These measurements are illustrated in Fig. 4

Mesial sites

Contrast

Std. Error

P-value

 EA < 30° (yes vs. no)

− 0.006

0.018

0.757

 Convex (yes vs. no)

0.048

0.018

0.009

Combinations of EA and convexity

  > 30° and convex vs. > 30° and concave

0.085

0.037

0.163

  < 30° and concave vs. > 30° and concave

0.005

0.021

0.996

  < 30° and convex vs. > 30° and concave

0.044

0.026

0.410

  < 30° and concave vs. > 30° and convex

− 0.078

0.034

0.137

  < 30° and convex vs. > 30° and convex

− 0.040

0.035

0.733

  < 30° and convex vs. < 30° and concave

0.039

0.020

0.292

Distal sites

Contrast

Std. Error

P-value

 EA < 30° (yes vs. no)

− 0.019

0.018

0.279

 Convex (yes vs. no)

0.034

0.019

0.067

Combinations of EA and convexity

  > 30° and convex vs. > 30° and concave

0.073

0.030

0.123

  < 30° and concave vs. > 30° and concave

− 0.003

0.022

1.000

  < 30° and convex vs. > 30° and concave

0.016

0.027

0.951

  < 30° and concave vs. > 30° and convex

− 0.076

0.027

0.053

  < 30° and convex vs. > 30° and convex

− 0.058

0.030

0.292

  < 30° and convex vs. < 30° and concave

0.018

0.022

0.878

Sites with NT/I

Contrast

Std. Error

P-value

 EA < 30° (yes vs. no)

− 0.023

0.033

0.477

 Convex (yes vs. no)

0.094

0.043

0.03

Combinations of EA and convexity

  > 30° and convex vs. > 30° and concave

0.484

0.085

< 0.001

  < 30° and concave vs. > 30° and concave

0.029

0.035

0.873

  < 30° and convex vs. > 30° and concave

0.019

0.056

0.990

  < 30° and concave vs. > 30° and convex

− 0.455

0.080

< 0.001

  < 30° and convex vs. > 30° and convex

− 0.465

0.090

< 0.001

  < 30° and convex vs. < 30° and concave

− 0.010

0.050

0.998

Sites at free end position

Contrast

Std. Error

P-value

 EA < 30° (yes vs. no)

− 0.008

0.027

0.773

 Convex (yes vs. no)

0.033

0.034

0.334

Combinations of EA and convexity

  > 30° and convex vs. > 30° and concave

0.049

0.055

0.855

  < 30° and concave vs. > 30° and concave

− 0.002

0.029

1.000

  < 30° and convex vs. > 30° and concave

0.019

0.043

0.978

  < 30° and concave vs. > 30° and convex

− 0.050

0.055

0.836

  < 30° and convex vs. > 30° and convex

− 0.029

0.062

0.973

  < 30° and convex vs. < 30° and concave

0.021

0.042

0.969

Splinted sites/facing pontics

Contrast

Std. Error

P-value

 EA < 30° (yes vs. no)

− 0.026

0.016

0.102

 Convex (yes vs. no)

0.031

0.015

0.038

Combinations of EA and convexity

  > 30° and convex vs. > 30° and concave

0.083

0.027

0.028

  < 30° and concave vs. > 30° and concave

− 0.006

0.020

0.993

  < 30° and convex vs. > 30° and concave

0.011

0.023

0.969

  < 30° and concave vs. > 30° and convex

− 0.089

0.024

0.003

  < 30° and convex vs. > 30° and convex

− 0.071

0.025

0.038

  < 30° and convex vs. < 30° and concave

0.018

0.017

0.791

Mesial sites

Contrast

Std. Error

P-value

 EA < 30° (yes vs. no)

− 0.011

0.019

0.550

 Convex (yes vs. no)

0.048

0.018

0.009

Combinations of EA and convexity

  > 30° and convex vs. > 30° and concave

0.060

0.039

0.482

  < 30° and concave vs. > 30° and concave

− 0.008

0.022

0.989

  < 30° and convex vs. > 30° and concave

0.038

0.027

0.586

  < 30° and concave vs. > 30° and convex

− 0.069

0.034

0.266

  < 30° and convex vs. > 30° and convex

− 0.002

0.036

0.940

  < 30° and convex vs. < 30° and concave

0.046

0.020

0.165

Distal sites

Contrast

Std. Error

P-value

 EA < 30° (yes vs. no)

− 0.0287

0. 023

0.031

 Convex (yes vs. no)

0.041

0.019

0.050

Combinations of EA and convexity

  > 30° and convex vs. > 30° and concave

0.044

0.023

0.129

  < 30° and concave vs. > 30° and concave

− 0.026

0.028

1.000

  < 30° and convex vs. > 30° and concave

0.008

0.030

0.902

  < 30° and concave vs. > 30° and convex

− 0.070

0.031

0.068

  < 30° and convex vs. > 30° and convex

− 0.036

0.032

0.350

  < 30° and convex vs. < 30° and concave

0.034

0.032

0.817

Sites with NT/I

Contrast

Std. Error

P-value

 EA < 30° (yes vs. no)

− 0.026

0.033

0.432

 Convex (yes vs. no)

0.090

0.043

0.039

Combinations of EA and convexity

  > 30° and convex vs. > 30° and concave

0.481

0.085

 < 0.001

  < 30° and concave vs. > 30° and concave

0.026

0.036

0.912

  < 30° and convex vs. > 30° and concave

0.017

0.056

0.993

  < 30° and concave vs. > 30° and convex

− 0.455

0.080

 < 0.001

  < 30° and convex vs. > 30° and convex

− 0.465

0.090

 < 0.001

  < 30° and convex vs. < 30° and concave

− 0.009

0.050

0.998

Sites at free end position

Contrast

Std. Error

P-value

 EA < 30° (yes vs. no)

− 0.008

0.027

0.773

 Convex (yes vs. no)

0.033

0.034

0.334

Combinations of EA and convexity

  > 30° and convex vs. > 30° and concave

0.049

0.055

0.855

  < 30° and concave vs. > 30° and concave

− 0.002

0.029

1.000

  < 30° and convex vs. > 30° and concave

0.019

0.043

0.978

  < 30° and concave vs. > 30° and convex

− 0.050

0.055

0.836

  < 30° and convex vs. < 30° and convex

− 0.029

0.062

0.973

  < 30° and convex vs. > 30° and concave

0.021

0.042

0.969

Splinted sites/facing pontics

Contrast

Std. Error

P-value

 EA < 30° (yes vs. no)

− 0.030

0.016

0.071

 Convex (yes vs. no)

0.033

0.015

0.029

Combinations of EA and convexity

  > 30° and convex vs. > 30° and concave

0.071

0.029

0.113

  < 30° and concave vs. > 30° and concave

− 0.015

0.020

0.907

  < 30° and convex vs. > 30° and concave

0.009

0.023

0.987

  < 30° and concave vs. > 30° and convex

− 0.086

0.025

0.007

  < 30° and convex vs. > 30° and convex

− 0.062

0.025

0.110

  < 30° and convex vs. < 30° and concave

0.02

0.017

0.563