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Table 1 Mean ± SD of percentage initial and percentage post load RTL1 and percentage difference between initial and post load RTL1 for GI and GII (regarding the screw loosening)

From: Effect of dynamic cyclic loading on screw loosening of retightened versus new abutment screw in both narrow and standard implants (in-vitro study)

% RTL 1 Groups T-test
Standard diameter Narrow diameter t P value
Initial Range 31.33 33.4 20 30 8.179 < 0.001*
Mean ± SD 32.491 ± 0.821 24.501 ± 2.978
Post load Range 36.67 42.5 40.33 47.67 − 4.488 < 0.001*
Mean ± SD 39.282 ± 2.255 43.766 ± 2.213
Paired test P value < 0.001* < 0.001*  
% Difference Range 10.01 35.57 37.78 118.33 − 7.398 < 0.001*
Mean ± SD 21.039 ± 8.758 81.110 ± 24.139
  1. *Statistical significant