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Table 3 Percentage of retention loss in (Newton) between the two studied groups at various times of measurement Primary retention vs one, two, and three years of use

From: Retention of bar clip attachment for mandibular implant overdenture

  PEEK clip
(M ± SD) (%)
Nylon clip
(M ± SD) (%)
p value
  Percentage change  
T1 versus T0 (%) − 54.13 − 1.80 0.000*
T2 versus T0 (%) − 52.63 − 5.24 0.000*
T2 versus T1 (%)  + 3.72 − 3.28 0.018*
T3 versus T0 (%) − 58.66  + 2.99 0.000*
T3 versus T2 (%) − 12.53  + 8.76 0.000*
  1. T0, at time of overdenture insertion; T1, after 1 year of use; T2, after 2 years of use; T3, after 3 years of use; NS, Statistically not significant (p ≥ 0.05)
  2. *Statistically significant (p < 0.05)