Table 4 Effect of impression coping design and implant angulation on accuracy

Open tray

High retentive (Osstem)

Parallel

16

0.008

0.005

0.0166*

Non-parallel

16

0.016

0.010

Medium retentive (Straumann)

Parallel

16

0.017

0.010

0.926

Non-parallel

16

0.015

0.026

Low retentive (SIC)

Parallel

16

0.019

0.030

0.999

Non-parallel

16

0.020

0.029

Closed tray

Triangular (Osstem)

Parallel

16

0.026

0.042

0.423

Non-parallel

16

0.039

0.076

Rectangular (Straumann)

Parallel

16

0.015

0.024

0.196

Non-parallel

16

0.016

0.022

Round (SIC)

Parallel

16

0.028

0.037

0.616

Non-parallel

16

0.041

0.036