The influence of the restorative material on the mechanical behavior of screw-retained hybrid-abutment-crowns

In Vitro Assessment of the Cell Metabolic Activity, Cytotoxicity, Cell Attachment, and Inflammatory Reaction of Human Oral Fibroblasts on Polyetheretherketone (PEEK) Implant–Abutment

“…PEEK and PEKK are flexible materials with a similar elasticity modulus (3–8 GPa) to human hard tissues and bones [ 1 , 9 ]. Using PEEK as an implant–abutment can reduce stress concentration on the surface and exert a shock-relieving effect [ 3 , 4 ]. Scholars have analyzed the stress distribution of PEEK as an implant material through finite element analysis [ 36 , 39 ].…”

“…Polyaryletherketone (PAEK) is a semi-crystalline high-performance thermoplastic polymer whose molecular backbone is linked by phenylene rings (aryl), oxygen bridges (R-O-R), and carbonyl groups (R-CO-R) [ 1 ]. The phenylene rings are unreactive, the ether group (R-O-R) provides flexibility, and the ketone group (R-CO-R) rigidity; therefore, the combination of the three functional groups creates PAEK with excellent resistance to chemical attack, good toughness, and high strength, combined with heat resistance and good processability [ 2 , 3 , 4 ]. The PAEK family has many members according to the different sequences and ratios of aryl, R-CO-R, and R-O-R in the chemical structure [ 5 ].…”

“…Additionally, PEEK overcomes the problems caused by the brittle properties of ceramic materials and artificial techniques, such as staining, which can adjust the final color, thereby conquering the unpleasing appearance of alloy materials [ 10 ]. PEEK restorations can be easily manufactured via computer-aided design and computer-aided manufacturing technology (CAD/CAM) [ 4 , 9 ]; because of the rapid development of digital dentistry, the digital files are easily preserved, so when failure occurs, the PEEK restorations can be reproduced immediately [ 3 , 11 ]. PEEK has a relatively close elasticity modulus (approx.…”

“…210 GPa, 550 MPa) [ 1 , 2 ], and has the capability of being combined with other materials [ 4 , 12 , 13 ]. The shock-absorbing effect provided by PEEK might moderately absorb and disperse the impact under occlusion and chewing force, achieving a stress-dispersion mode like natural teeth [ 1 , 3 , 4 , 9 ]. Titanium osteosynthesis materials may cause complications over time and may need to be removed [ 14 ]; however, owing to the natural properties of PEEK, it can be used as a bone substitute in tissue engineering [ 15 ].…”

Prosthetic Materials Used for Implant-Supported Restorations and Their Biochemical Oral Interactions: A Narrative Review

“…Certain aspects regarding the correlation between PEEK (polyether ether ketone)’s chemical structure and the oral cavity conditions have already been demonstrated to be favorable: the ether groups (R-O-R) ensure structural flexibility, ketone groups (R-CO-R) give rigidity, while the phenylene groups are chemically unreactive. Consequently, the three functional groups give PEEK (polyether ether ketone) an excellent resistance to chemical attack, good processability, toughness, and high strength [ 3 , 81 , 83 , 84 , 85 , 86 ]. It has been pointed out that PEEK (polyether ether ketone) has a good resistance to hydrolysis [ 80 , 87 ].…”