ABSTRACT
Objectives: to assess the pull off of Polyetheretherketone (PEEK) anterior crown after various
surface treatments.
Materials& Methods: Twenty Polyetheretherketone (PEEK) full coverage crown were
constructed on prepared human maxillary central incisors. All of the crowns (n=20) were divided
into four groups according to the surface treatment used group I ) Control , 2) 98% Sulphric acid, 3)
9.5% Hydrofluoric acid (HF ) 4) Air Abrasion with 50 μm AL2
O3
.( n=5 in each ) Afterwards, each
crown specimens were cementeded to corresponding abutments using self-adhesive resin cement
RelyX U200. Then, subjected to thermo cycling (5°C - 55°C,5000 cycles,). A universal testing
machine was used to assess pull-off test. Data were collected, tabulated and statistically evaluated.
Results: The mean pull off values were ranked as follows: group II (253.81±7.67 N) > group
IV (221.18±3.91N) ≥ group III (203.20±8.23N) > group I (135.91±9.92N). The highest and lowest
Pull off values was obtained in group II (253.81±7.67 N) and group I (135.91±9.92N), respectively.
Conclusions: 98% sulphric acid PEEK surface treatment is recommended to achieve high
retentive strength.