Modified PEEK as an alternative crown framework material for weak abutment teeth: a case report.

This case report describes the fabrication of 3 single crowns for a patient with weakened abutment teeth. The patient exhibited nocturnal bruxism and clenching but refused to use an occlusal appliance. The abutment teeth were endodontically treated and presented with loss of tooth structure and thin axial walls. The patient was seeking a metal-free restoration, and all-ceramic restorations were contraindicated because of the potential for abrasion of the opposing teeth and direct force transmission to the weak abutment teeth. The restoration of choice was a modified polyetheretherketone (PEEK) framework material veneered with an indirect light-cured composite resin. This approach offered characteristics such as biocompatibility, protection of opposing teeth, a cushioning effect, abrasion resistance almost equal to that of dentin, ease of intraoral repair in case of chipping, and a high level of comfort. The use of PEEK frameworks veneered with indirect light-cured composite resin could be a viable alternative for the treatment of weakened abutment teeth in patients with parafunctional habits.