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As a result of an increasing demand for fabricating metal-free restorations and parallel with the developments in computer-assisted design and computer-assisted manufacturing (CAD-CAM) technology and materials, CAD-CAM high-performance polymers (HPPs) have been introduced as alternative materials to titanium and zirconia. 1-8 HPPs have been increasingly used as a framework material for fixed and removable prostheses and for implant-supported prostheses. These materials have been reported to have favorable thermal and mechanical properties. 1,9-11 Polyaryletherketones (PAEKs) and modified composite resin (MCR) polymers are currently available HPP materials. 6,11-17 Polyetheretherketone (PEEK) and polyetherketoneketone (PEKK) are 2 main groups of the PAEK polymer family that contain an aromatic backbone molecular chain, interconnected by functional ketone and ether groups. 1,2,10-12,16,18-20 PEEK and PEKK are high-temperature semicrystalline thermoplastic polymers with linear chain structures. 10-12,16,18-20 PEEK has been reported to be easily machinable, have low solubility and water absorption, and have high polishability and stability in terms of hardness, rigidity,

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BackgroundThe load‐to‐failure performance of computer‐assisted design and computer‐assisted manufacturing (CAD‐CAM) high performance polymers (HPP) and new generation cubic zirconia (Zir) material when used with titanium (Ti) bases for implant‐supported fixed prostheses with cantilevers is unknown.PurposeTo evaluate the load‐to‐failure performance of different CAD‐CAM fabricated HPP and a new generation cubic Zir in a cantilevered situation when used with Ti bases.Materials and MethodsFive specimens with a Ti base and five specimens without Ti bases were fabricated from seven different CAD‐CAM HPPs (100% PEEK [J and CP], 80% PEEK with 20% filler [BRE], 80% PEKK with 20% filler [PK], ceramic reinforced PEEK [ZZ], interlaced fiberglass and resin [TR], fiber‐composite material [T]). Five specimens with Ti base and two specimens without Ti base were prepared from a new generation cubic Zir (DD) and a 3Y‐TZP Zir (FZR) as the control group (N = 84). All specimens (8 × 7 × 30 mm) were stabilized using a clamp attached to the first 20 mm of each specimen for a 10 mm cantilever. Static loading was applied vertically on the cantilever and the maximum load‐to‐failure values (N) were analyzed using a two‐way ANOVA and t‐test (alpha = .05).ResultsHPP and Zir specimens without Ti bases had significantly higher load‐to‐failure values than Ti based ones in all groups (P < .05). PK with Ti base had significantly lower load‐to‐failure values than other materials (P < .001). FZR showed significantly higher load‐to‐failure values than all HPPs and DD (P < .001).ConclusionsLoad‐to‐failure values of HPPs and Zir were lower when Ti bases were used. New generation cubic Zir and all HPPs had lower load‐to‐failure values than FZR. HPPs performance varied among tested materials. PEKK with Ti base had the lowest load‐to‐failure value.