Sapporo Medical Journal

Abstract : Introduction: The use of CAD/CAM in the manufacture of PEEK and acetal frameworks helps to increase the accuracy and retention of the partial denture frameworks. Aim: is to compare the retentive force of peek and acetal digitally milled partial denture frameworks. Materials and Methods: Twenty digital partial denture framework were milled by CAD/CAM, divided into two equal groups (n=10), ten digitally milled PEEK frameworks and ten digitally milled acetal frameworks. Preparation the clasp of two partial denture was designed on CAD CAM software with thickness 2 mm. and designed hook at the central and bilateral at 5,6 area occlusally to pullout the cast clasps later. Instron universal testing machine model 3345 England used with tensile load at crosshead speed of 5 mm/min until automatically stopped. Results: Retentive force of PEEK was higher than retentive force of acetal in bilateral and unilateral measurement. Conclusion: PEEK should be considered as a substitute framework material for a well-designed Cr-Co RDP.